Networking
Cloud networking determines how your services communicate, how your users reach your applications, and how much you pay for data transfer. A poorly designed network architecture leads to performance bottlenecks, security gaps, and surprise egress bills that can exceed your compute costs. Getting networking right from the start saves months of painful re-architecture later.
Virtual private clouds are the building blocks of cloud networking. AWS VPCs, Azure VNets, and GCP VPCs each provide logically isolated network spaces where you deploy resources. The first decision you face is CIDR block allocation -- choose too small and you will run out of IP addresses as you scale; choose overlapping ranges and you will be unable to peer networks later. Our CIDR calculators and subnet planners help you design address spaces that accommodate growth, multi-region deployments, and hybrid connectivity from day one.
Subnet design is more nuanced than it first appears. Public subnets with internet gateways, private subnets with NAT gateways, isolated subnets with no internet access at all -- each serves a different purpose and carries different cost implications. NAT gateways on AWS alone cost $0.045 per hour plus $0.045 per GB of data processed, which can easily reach thousands of dollars per month for data-heavy workloads. Our NAT gateway cost estimators and network tier comparisons help you understand these costs before they show up on your bill.
Load balancing is essential for distributing traffic across healthy instances and providing high availability. The choice between Layer 4 and Layer 7 load balancers affects your latency, feature set, and cost. AWS offers ALB (HTTP/HTTPS), NLB (TCP/UDP), and GLB (third-party appliances). Azure provides Azure Load Balancer (L4) and Application Gateway (L7). GCP has a unified Cloud Load Balancing service with global and regional options. Choosing the wrong type means either paying for features you do not use or lacking features you need.
DNS is the front door to every internet-facing application. Route 53, Azure DNS, and Cloud DNS provide authoritative DNS hosting with health checks, failover routing, and latency-based routing. Misconfigured DNS records cause outages that are invisible to traditional monitoring until users start complaining. Our DNS record builders validate your configurations and ensure you set correct TTLs, priority values, and health check associations.
Content delivery networks push your static assets and cacheable responses to edge locations around the world, reducing latency for global users and offloading traffic from your origin servers. CloudFront, Azure Front Door, and Cloud CDN each have different caching behaviors, invalidation mechanisms, and pricing models. Understanding cache behavior rules -- path patterns, header forwarding, query string handling -- is critical for cache hit ratios and cost efficiency.
VPN and private connectivity services let you extend your on-premises network into the cloud or connect cloud networks across regions and providers. AWS Site-to-Site VPN, Azure VPN Gateway, and GCP Cloud VPN all use IPsec tunnels, but their bandwidth limits, redundancy options, and pricing differ significantly. For higher throughput, dedicated connections like AWS Direct Connect, Azure ExpressRoute, and GCP Cloud Interconnect provide private links to cloud networks without traversing the public internet.
Peering and transit architectures determine how traffic flows between VPCs, VNets, and projects. VPC Peering is the simplest option but does not scale beyond a handful of connections because peering is not transitive -- if VPC A peers with VPC B and VPC B peers with VPC C, traffic from A cannot reach C through B. Transit Gateways (AWS), Azure Virtual WAN, and GCP Network Connectivity Center provide hub-and-spoke models that simplify routing at scale. The choice between these architectures affects your latency, data transfer costs, and operational complexity. Getting this decision wrong early means a painful migration later when your network grows beyond what simple peering can support.
Network security goes beyond firewalls. VPC Flow Logs, Network Watcher, and VPC Firewall Insights give you visibility into traffic patterns, while private endpoints, PrivateLink, and VPC Service Controls keep traffic on private networks instead of routing through the public internet. Zero Trust networking -- where every request is authenticated regardless of network location -- is becoming the standard for modern cloud architectures. Implementing Zero Trust requires combining network segmentation with identity-based access, mTLS between services, and continuous verification of both the user and the device making each request.
The networking tools on CloudToolStack cover the full spectrum: CIDR planning, subnet design, load balancer selection, DNS configuration, CDN optimization, VPN comparison, and cost estimation for every major data transfer path. Whether you are designing a greenfield multi-region architecture or troubleshooting why a VPC peering connection is not routing traffic, these tools provide the interactive calculations and validations you need. All calculations run locally in your browser with no data leaving your machine. The tools are designed by network engineers who have spent years building and operating cloud networks at scale, and every calculator reflects real-world pricing and constraints.
All Networking Tools (89)
VPC CIDR Calculator
Calculate network, broadcast, host range, and mask from CIDR notation.
Open toolSubnet Planner
Plan and visualize subnet allocation within a VPC CIDR block.
Open toolCIDR Overlap Checker
Check multiple CIDR ranges for overlapping IP address spaces.
Open toolRoute 53 Record Builder
Build Route 53 DNS record configurations for A, AAAA, CNAME, MX, TXT, and alias records.
Open toolNAT Gateway Cost Estimator
Estimate monthly NAT Gateway costs based on hours and data processed.
Open toolAzure VNet CIDR Planner
Plan Azure Virtual Network address spaces and subnet allocation with Azure-specific rules.
Open toolAzure Private Endpoint Checker
Check Private Endpoint DNS and networking requirements for Azure services.
Open toolAzure DNS Zone Builder
Build Azure DNS zone record configurations for public and private zones.
Open toolAzure Load Balancer SKU Compare
Compare Azure Load Balancer SKUs (Basic vs Standard) features and pricing.
Open toolGCP VPC CIDR Planner
Plan GCP VPC subnet allocation across regions with GKE-aware sizing.
Open toolGCP Private Service Connect Checker
Check Private Service Connect requirements and DNS configuration for GCP services.
Open toolGCP Cloud DNS Builder
Build Cloud DNS record sets for public and private managed zones.
Open toolGCP Load Balancer Chooser
Choose the right GCP load balancer type based on protocol, scope, and requirements.
Open toolGCP Network Tier Compare
Compare GCP Premium vs Standard network tiers for features, routing, and pricing.
Open toolMulti-Cloud CDN Compare
Compare CDN services (CloudFront, Azure CDN, Cloud CDN) features and pricing.
Open toolCloudFront Cache Behavior Builder
Build CloudFront cache behavior configurations with path patterns, cache policies, and function associations in CloudFormation and Terraform.
Open toolAzure Front Door Rule Builder
Build Front Door routing rules, URL redirect/rewrite, header modification, and caching configs in ARM and Bicep formats.
Open toolAzure Application Gateway Sizer
Size and estimate costs for Azure Application Gateway Standard_v2 and WAF_v2 with capacity unit calculation.
Open toolGCP Cloud Interconnect Config Builder
Build Dedicated or Partner Interconnect configurations with VLAN attachments, BGP sessions, and bandwidth settings.
Open toolGCP Network Connectivity Hub Builder
Build Network Connectivity Center hub and spoke configurations for multi-region and hybrid connectivity.
Open toolGCP Cloud Router Config Builder
Build Cloud Router configurations with BGP peering, custom route advertisements, and BFD settings.
Open toolAWS CloudFront Function Tester
Validate CloudFront Functions event structures for viewer request and response.
Open toolAzure Traffic Manager Profile Builder
Configure Traffic Manager routing methods, endpoints, and health checks.
Open toolAzure Kubernetes Ingress Builder
Generate NGINX and Application Gateway ingress manifests for AKS.
Open toolGCP Cloud NAT Config Builder
Configure Cloud NAT gateways with IP allocation, port ranges, and logging.
Open toolAWS VPC Endpoint Policy Builder
Build VPC endpoint policies to restrict service access through interface and gateway endpoints.
Open toolAzure Private DNS Resolver Builder
Build Private DNS Resolver configurations with forwarding rulesets and endpoints.
Open toolMulti-Cloud VPN Compare
Compare VPN gateway options, pricing, and bandwidth across providers.
Open toolMulti-Cloud DNS Compare
Compare DNS services (Route 53, Azure DNS, Cloud DNS) features and pricing.
Open toolOCI VCN CIDR Planner
Plan VCN and subnet CIDR allocation with availability domain awareness.
Open toolOCI Load Balancer Config Builder
Build OCI Load Balancer backend set, listener, and health check configurations.
Open toolOCI DNS Zone Builder
Build OCI DNS zone record configurations for public and private zones.
Open toolOCI NSG Rule Builder
Build Network Security Group rules with CIDR and NSG source references.
Open toolOCI DRG Route Table Builder
Build Dynamic Routing Gateway route tables and import distribution configurations.
Open toolOCI WAA Policy Builder
Build Web Application Acceleration caching policies with compression and purge rules.
Open toolOCI FastConnect Config Builder
Build FastConnect virtual circuit configurations with BGP peering and bandwidth settings.
Open toolOCI Network Firewall Policy Builder
Build OCI Network Firewall policy rules with IP lists, URL filtering, and TLS inspection.
Open toolOCI Service Gateway Config Builder
Build Service Gateway route rule configurations for private access to OCI services.
Open toolOCI Network Load Balancer Builder
Build Network Load Balancer backend set, listener, and health check configurations.
Open toolOCI Local Peering Gateway Builder
Build Local Peering Gateway configurations for same-region VCN-to-VCN peering.
Open toolOCI Remote Peering Connection Builder
Build Remote Peering Connection configurations for cross-region VCN connectivity through DRG.
Open toolOCI VTAP Config Builder
Build VTAP packet mirroring configurations with capture filters for network traffic analysis.
Open toolTransit Gateway Route Builder
Build Transit Gateway route table entries with static routes and propagations.
Open toolGlobal Accelerator Config Builder
Build Global Accelerator endpoint group configurations for multi-region traffic.
Open toolNetwork Firewall Rule Builder
Build AWS Network Firewall stateful and stateless rule group configurations.
Open toolVirtual WAN Config Builder
Build Azure Virtual WAN hub, VPN site, and VNet connection configurations.
Open toolAzure Firewall Policy Rule Builder
Build Azure Firewall Premium policy rules with IDPS, DNS proxy, and TLS inspection.
Open toolExpressRoute Config Builder
Build ExpressRoute circuit configurations with peerings and route filters.
Open toolMulti-Cloud Private Connectivity Compare
Compare dedicated connectivity services (Direct Connect, ExpressRoute, Interconnect, FastConnect).
Open toolMulti-Cloud Firewall Compare
Compare cloud-native firewall services across AWS, Azure, GCP, and OCI.
Open toolGCP Cloud IDS Config Builder
Build Cloud IDS endpoint configurations with threat detection severity, packet mirroring, and traffic logs.
Open toolGCP Network Endpoint Group Builder
Build NEG configurations for serverless, internet, and hybrid connectivity endpoints.
Open toolGCP SSL Policy Builder
Build SSL policy configurations for load balancers with TLS version requirements and cipher suite profiles.
Open toolGCP URL Map Builder
Build URL map routing configurations for HTTP(S) load balancers with host rules and path matchers.
Open toolGCP Traffic Director Config Builder
Build Traffic Director service mesh configurations with mesh resources, gateways, and routing rules.
Open toolGCP Service Directory Config Builder
Build Service Directory namespace configurations with services, endpoints, and DNS zone integration.
Open toolGCP Private Service Access Builder
Build Private Service Access configurations for VPC peering with Google managed services.
Open toolMulti-Cloud Service Mesh Compare
Compare service mesh solutions across AWS App Mesh, Azure Istio, GCP Cloud Service Mesh, and OCI.
Open toolMulti-Cloud Global LB Compare
Compare global load balancing across AWS Global Accelerator, Azure Front Door, GCP Cloud LB, and OCI.
Open toolMulti-Cloud DNS Resolver Compare
Compare DNS resolver and forwarding services across AWS Route 53 Resolver, Azure DNS, Cloud DNS, and OCI.
Open toolMulti-Cloud Network Peering Compare
Compare VPC/VNet/VCN peering models across AWS, Azure, GCP, and OCI.
Open toolAWS ALB Listener Rule Builder
Build ALB listener rule configurations with path, host, header conditions and weighted target group actions.
Open toolAWS NLB Target Group Builder
Build NLB target group configurations with health checks, stickiness, and deregistration delay settings.
Open toolAWS PrivateLink Endpoint Service Builder
Build PrivateLink endpoint service configurations with NLB/GWLB associations, allowed principals, and private DNS.
Open toolAWS Route 53 Health Check Builder
Build Route 53 health check configurations with HTTP/HTTPS/TCP checks, latency measurement, and CloudWatch alarm integration.
Open toolAWS Direct Connect VIF Builder
Build Direct Connect virtual interface configurations with BGP peering, VLAN, and MTU settings.
Open toolAWS VPC Flow Log Builder
Build VPC Flow Log configurations with custom log formats, S3/CloudWatch destinations, and partition options.
Open toolAWS Cloud Map Service Builder
Build Cloud Map service discovery configurations with DNS settings, health checks, and routing policies.
Open toolAWS App Mesh Virtual Service Builder
Build App Mesh virtual service, router, and route configurations with weighted targets and retry policies.
Open toolAzure WAF Policy Builder
Build WAF policy configs with custom rules for IP blocking, rate limiting, geo-filtering, and OWASP managed rule set overrides.
Open toolAzure NAT Gateway Config Builder
Build NAT Gateway configs with public IP addresses, IP prefixes, subnet associations, and idle timeout settings.
Open toolAzure Bastion Config Builder
Build Azure Bastion host configs with SKU selection, scale units, tunneling, IP Connect, Kerberos, and NSG rules.
Open toolAzure Private Link Service Builder
Build Private Link service configs with load balancer frontend IPs, NAT IP configurations, visibility, and auto-approval settings.
Open toolAzure Route Server Config Builder
Build Route Server configs with BGP peerings to network virtual appliances, branch-to-branch traffic, and hub routing preferences.
Open toolAzure CDN Profile Config Builder
Build CDN profile and endpoint configs with origins, origin groups, delivery rules, caching, compression, and custom domains.
Open toolAzure VNet Peering Config Builder
Build VNet peering configs with gateway transit, forwarded traffic, cross-subscription peering, and hub-spoke topology settings.
Open toolAzure Network Manager Config Builder
Build Network Manager connectivity configs with network groups, hub-and-spoke topology, and security admin rules.
Open toolDO Load Balancer Config Builder
Build DigitalOcean Load Balancer configurations with forwarding rules and health checks.
Open toolDO VPC Config Builder
Build DigitalOcean VPC network configurations with IP ranges and peering.
Open toolIBM VPC Subnet Planner
Plan VPC subnet layouts with address prefixes, zones, public gateways, and security groups.
Open toolIBM VPC Load Balancer Config Builder
Build VPC Application and Network Load Balancer configs with listeners, pools, and health monitors.
Open toolIBM Direct Link Config Builder
Build Direct Link Dedicated and Connect configurations with BGP peering, virtual connections, and route filters.
Open toolLinode NodeBalancer Config Builder
Build NodeBalancer configurations with health checks, SSL termination, sticky sessions, and backend nodes.
Open toolLinode VPC Config Builder
Build VPC configurations with subnets, IP ranges, and multi-tier network architectures.
Open toolAlibaba VPC Config Builder
Build VPC configurations with vSwitches, NAT gateways, route tables, and multi-zone subnet layouts.
Open toolAlibaba SLB Config Builder
Build Server Load Balancer configurations with listeners, health checks, backend servers, and session persistence.
Open toolIPv4 Subnet Visualizer
Visualize how a parent CIDR block is divided into subnets with allocation bars and utilization metrics.
Open toolMulti-Cloud Egress Cost Calculator
Calculate and compare data egress costs across AWS, Azure, GCP, and OCI with tiered pricing breakdowns.
Open toolCloud Region Latency Estimator
Estimate network latency between cloud regions across AWS, Azure, GCP, and OCI based on geographic distance.
Open toolRelated Guides (30)
Multi-Cloud Networking Glossary
beginnerInteractive glossary mapping networking terms and services across providers.
10 min readAzure Service Tag Lookup
intermediateLook up Azure service tags and their IP ranges for NSG and firewall rules.
6 min readVPC Architecture Patterns
intermediateCommon VPC designs including multi-tier, hub-and-spoke, and transit gateway architectures.
28 min readAWS Networking Deep Dive
advancedAdvanced networking concepts including PrivateLink, VPC endpoints, and cross-region connectivity.
30 min readRoute 53 DNS Patterns
intermediateDNS routing policies, failover patterns, and multi-region strategies with Route 53.
24 min readVirtual Network Architecture
intermediateDesign Azure VNets with hub-spoke topology, peering, and private connectivity patterns.
28 min readAzure Networking Deep Dive
advancedAdvanced networking with Private Link, Application Gateway, and ExpressRoute patterns.
30 min readAzure DNS Setup Guide
beginnerSet up Azure DNS zones, configure records, and integrate with App Service custom domains.
20 min readVPC Network Design Patterns
intermediateDesign GCP VPC networks with Shared VPC, peering, and Private Google Access patterns.
28 min readGCP Networking Deep Dive
advancedAdvanced networking with Cloud Interconnect, Private Service Connect, and Cloud NAT.
30 min readCloud DNS Configuration
beginnerConfigure Cloud DNS managed zones, DNSSEC, and private DNS for VPC networks.
20 min readCloudFront CDN Guide
intermediateConfigure Amazon CloudFront for global content delivery, including distributions, cache behaviors, Lambda@Edge, security, and performance optimization.
24 min readFront Door & CDN Guide
intermediateConfigure Azure Front Door and CDN for global content delivery, including routing, WAF policies, caching, SSL/TLS, and performance optimization.
24 min readCloud CDN & Load Balancing
intermediateConfigure GCP Cloud CDN and Cloud Load Balancing, including HTTP(S) load balancers, Cloud Armor WAF, caching, SSL/TLS, and backend services.
24 min readAWS Transit Gateway Patterns
advancedDeep dive into AWS Transit Gateway covering hub-spoke architecture, inter-region peering, multicast, route tables, centralized egress, and inspection patterns.
28 min readGCP Shared VPC Design
advancedGuide to GCP Shared VPC covering host/service project architecture, subnet delegation, IAM configuration, firewall policies, Cloud NAT, GKE integration, and troubleshooting.
24 min readOCI VCN Networking Deep Dive
intermediateDesign OCI virtual cloud networks with subnets, security lists, NSGs, gateways, and FastConnect.
25 min readNetworking Across Clouds
intermediateSide-by-side comparison of networking across AWS, Azure, GCP, and OCI covering VPC architecture, firewalls, load balancing, DNS, VPN, interconnect, peering, and multi-cloud connectivity patterns.
24 min readOCI DNS & Traffic Management
intermediateConfigure OCI DNS zones, steering policies for failover and geo-routing, health checks, private DNS, and DNSSEC.
22 min readAzure Virtual WAN Guide
advancedBuild enterprise networking with Azure Virtual WAN: hubs, site-to-site VPN, ExpressRoute, Secured Hubs, and routing intent.
24 min readOCI Load Balancer Deep Dive
intermediateMaster OCI flexible and network load balancers with health checks, SSL termination, backend sets, path-based routing, and session persistence.
25 min readOCI + Azure Multi-Cloud Guide
advancedBuild multi-cloud architectures with OCI and Azure: OracleDB@Azure, FastConnect-ExpressRoute interconnect, identity federation, and data transfer patterns.
26 min readAWS Global Accelerator Guide
intermediateOptimize global traffic with Global Accelerator: anycast IPs, endpoint groups, health checks, and DDoS protection.
22 min readAzure Private Endpoint Guide
intermediateSecure PaaS services with Private Endpoints: DNS resolution, cross-region, hub-spoke, and troubleshooting.
23 min readVPC/VNet/VCN Peering Across Clouds
intermediateCompare VPC Peering across AWS, Azure, GCP: peering models, transit routing, cross-cloud VPN, and IP planning.
24 min readDNS Architecture Across Clouds
intermediateDesign DNS for multi-cloud: public/private zones, hybrid resolution, split-horizon, and centralized DNS strategies.
24 min readDigitalOcean VPC & Networking Guide
intermediateGuide to DigitalOcean networking covering VPCs, Cloud Firewalls, Load Balancers, Reserved IPs, DNS management, SSL certificates, and network architecture patterns.
22 min readIBM Cloud VPC Networking
intermediateDesign IBM Cloud VPC networks with subnets, security groups, ACLs, public gateways, VPN, Transit Gateway, Direct Link, and VPE.
24 min readLinode Networking Guide
intermediateMaster Linode networking with VPC, NodeBalancers, Cloud Firewall, DNS Manager, IPv6, and Akamai CDN integration for secure, high-performance architectures.
24 min readAlibaba Cloud VPC Networking
intermediateDesign VPC architectures with vSwitches, NAT gateways, CEN Transit Router, VPN Gateway, and network security best practices.
24 min readRelated Articles (12)
Top 10 AWS Cost Mistakes (And How to Fix Them)
Common billing surprises from NAT Gateways, idle resources, oversized instances, and missed savings plans — with concrete fixes.
5 Multi-Cloud Strategy Mistakes Every Team Makes
Why spreading workloads across clouds often backfires, and how to build a multi-cloud strategy that actually works.
Managed Kubernetes: EKS vs AKS vs GKE vs OKE
A hands-on comparison of managed Kubernetes across all four major clouds — pricing, networking, autoscaling, and operational overhead.
Cloud Networking Costs: The Hidden Traps That Blow Your Budget
NAT Gateways, cross-AZ traffic, load balancer idle charges, and other networking costs that catch teams off guard.
CIDR Notation Explained: A Visual Guide for Cloud Engineers
Finally understand CIDR, subnet masks, and IP address planning with visual examples and practical cloud VPC use cases.
Cloud Disaster Recovery: Pilot Light vs Warm Standby vs Multi-Region Active
The four DR tiers explained with architecture diagrams, RTO/RPO targets, and real cost comparisons across clouds.
Zero Trust Networking on AWS, Azure, and GCP: A Practical Implementation Guide
Identity-based access, micro-segmentation, PrivateLink, Private Endpoints, and VPC Service Controls -- real implementation patterns across all three major clouds.
Migrating DNS to the Cloud: Route 53, Azure DNS, and Cloud DNS Compared
DNS migration strategies, health checks, failover routing, latency-based routing, DNSSEC, and a practical pre-migration checklist.
WAF Configuration Across Clouds: AWS WAF, Azure WAF, and Cloud Armor
Practical WAF configuration covering rule groups, rate limiting, bot management, OWASP Top 10 protection, and cost comparison across AWS, Azure, and GCP.
Choosing the Right Load Balancer: ALB vs NLB vs Azure LB vs GCP Load Balancers
Cover L4 vs L7 load balancers, TLS termination strategies, WebSocket support, cost comparison, and a decision tree for choosing the right load balancer across AWS, Azure, and GCP.
Cloud Egress Costs: How to Stop Paying $0.09/GB for Data Transfer
Inter-region, inter-AZ, and internet egress pricing across all clouds, CDN optimization, VPC endpoints, Private Link, and a 10TB/month cost comparison.
Cloud Network Troubleshooting: VPC Flow Logs, NSG Diagnostics, and Packet Mirroring
Flow log analysis, VPC Reachability Analyzer, Azure Network Watcher, GCP Connectivity Tests, and step-by-step debugging for instances that cannot communicate and intermittent packet loss.
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