Subnet Calculator

Work out what an address block covers, divide it, and check a list of ranges against the assets in an open analysis.

Address or block

Try 10.0.0.0/24a block 10.0.0.7/24a host in one 10.0.0.0 255.255.255.0a dotted mask 2001:db8::/64IPv6

Divide into

Range list — optional

Paste the ranges you use for exposure tagging. Commas, semicolons and newlines all work. This page reports what they cover and where they repeat themselves; open it from a running analysis to check them against your uploaded assets.