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Developer Tools2026-03-185 min read

Private IP Address Ranges: RFC 1918 Explained

Complete guide to private IP ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16. With use cases and AWS/cloud networking.

RFC 1918 Private Ranges

10.0.0.0/8      10.0.0.0 - 10.255.255.255    16.7M addresses\n172.16.0.0/12   172.16.0.0 - 172.31.255.255  1M addresses\n192.168.0.0/16  192.168.0.0 - 192.168.255.255 65K addresses

Common Cloud VPC CIDRs

AWS default VPC: 172.31.0.0/16\nCommon custom: 10.0.0.0/16 (per region)\nSmall VPC: 10.0.0.0/20 (4,096 IPs)

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