CIDR Prefix: /20
Usable Host Range for /20 Subnet
GCP default custom VNet block and standard large availability zone subnet. Pre-calculated routing boundaries, binary mapping mask, cloud provider allocation metrics, and copy-ready Terraform snippets.
100% Free & Secure Client-Side Sandbox
Interactive /20 Subnet Workspace
Pre-loaded Seed: 10.128.0.0/20Instantly ingest standardized industrial address space assignments from cloud reference blueprints.
Pre-Computed /20 Subnet Technical Specifications
Verified 32-bit Bitwise Calculation MatrixSubnet Mask (Dotted Decimal)255.255.240.0
Usable Host Capacity4,094 IPs
Cloud Reserved IPs (AWS)5 IPs
Default Range Seed10.128.0.0/20
| Binary Mask Blueprint | 11111111.11111111.11110000.00000000 |
|---|---|
| CIDR Notation | /20 |
| Netmask Address | 255.255.240.0 |
| Total Host Addresses | 4,096 |
| Usable Hosts (Standard IPv4) | 4,094 usable IPs |
| Cloud Net Capacity (AWS / GCP) | 4,091 usable IPs(AWS reserves 5 addresses: Network, VPC Router, DNS, Reserved, Broadcast) |
| Primary Architectural Use Case | GCP default custom VNet block and standard large availability zone subnet. |
Terraform IaC Configuration Block (/20)
Copy-ready infrastructure coderesource "google_compute_subnetwork" "subnet_20" {
name = "custom-subnet-20"
ip_cidr_range = "10.128.0.0/20"
region = "us-central1"
network = google_compute_network.custom.id
}Related CIDR Subnet Specifications
← Larger Network (Double Host Capacity)/19 Subnet (8,190 Usable Hosts)
Regional workload subnet for container platforms requiring high IP density.
Smaller Network (Half Host Capacity) →/21 Subnet (2,046 Usable Hosts)
Medium-to-large availability zone subnet supporting up to 2,046 compute instances.