CIDR Prefix: /31
Usable Host Range for /31 Subnet
RFC 3021 point-to-point links using zero broadcast addresses for router links. Pre-calculated routing boundaries, binary mapping mask, cloud provider allocation metrics, and copy-ready Terraform snippets.
100% Free & Secure Client-Side Sandbox
Interactive /31 Subnet Workspace
Pre-loaded Seed: 192.168.1.0/31Instantly ingest standardized industrial address space assignments from cloud reference blueprints.
Pre-Computed /31 Subnet Technical Specifications
Verified 32-bit Bitwise Calculation MatrixSubnet Mask (Dotted Decimal)255.255.255.254
Usable Host Capacity2 IPs
Cloud Reserved IPs (AWS)0 IPs
Default Range Seed192.168.1.0/31
| Binary Mask Blueprint | 11111111.11111111.11111111.11111110 |
|---|---|
| CIDR Notation | /31 |
| Netmask Address | 255.255.255.254 |
| Total Host Addresses | 2 |
| Usable Hosts (Standard IPv4) | 2 usable IPs |
| Cloud Net Capacity (AWS / GCP) | 2 usable IPs(AWS reserves 5 addresses: Network, VPC Router, DNS, Reserved, Broadcast) |
| Primary Architectural Use Case | RFC 3021 point-to-point links using zero broadcast addresses for router links. |
Terraform IaC Configuration Block (/31)
Copy-ready infrastructure code# Note: AWS VPC subnets require a minimum size of /28.
# /31 subnets (RFC 3021) are used for point-to-point router links & DirectConnect BGP.
resource "aws_route" "p2p_31" {
route_table_id = aws_route_table.core.id
destination_cidr_block = "192.168.1.0/31"
transit_gateway_id = aws_ec2_transit_gateway.main.id
}Related CIDR Subnet Specifications
← Larger Network (Double Host Capacity)/30 Subnet (2 Usable Hosts)
Point-to-point router links and private interconnect virtual interfaces.
Smaller Network (Half Host Capacity) →/32 Subnet (1 Usable Hosts)
Single host loopback address, host route, or security group rule target IP.