Subnet Calculator

IPv4 and IPv6 networks, host ranges and subnetting — calculated as you type.

How the ranges are calculated

p = prefix length
  • network = IP AND mask
  • broadcast = network OR wildcard
  • usable hosts = 232 − p − 2
Show the working

    RFCs on this page

    the standards behind these results
    What these RFCs say

    Accepts 10.0.0.1/8, 10.0.0.1 255.0.0.0, 2001:db8::1/64, or just an address (uses the prefix below).

    Examples