Subnet Cheat Sheet

Quick reference for CIDR prefixes, subnet masks, host counts, and private IP ranges.

CIDRSubnet MaskUsable HostsClass

/8255.0.0.016,777,214A

/16255.255.0.065,534B

/24255.255.255.0254C

/25255.255.255.128126

/26255.255.255.19262

/27255.255.255.22430

/28255.255.255.24014

/29255.255.255.2486

/30255.255.255.2522

/31255.255.255.2542 (p2p)

/32255.255.255.2551 (host)