Subnet Calculator

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

10.0.0.0/24

Private IPv4 Nothing typed here is looked up or stored.

RFC 1918 / RFC 4193 space. Not routable on the public internet, so an asset here is not internet-facing by address alone.

Address 10.0.0.7
As an integer 167772167
In hex 0A.00.00.07
Address range 10.0.0.0 – 10.0.0.255
Range as integers 167772160 – 167772415
Range in hex 0A.00.00.00 – 0A.00.00.FF
Total addresses 256 Reserved ones included
Usable hosts 254 Total minus network and broadcast
Prefix /24 24 network bits, 8 host
Netmask 255.255.255.0
Netmask in hex FF.FF.FF.00
Wildcard 0.0.0.255

Reverse DNS zone 0.0.10.in-addr.arpa. WHERE ip_int BETWEEN 167772160 AND 167772415 is how this block is queried in a database.

Boundaries 254 usable · reserved ends widened to stay visible
10.0.0.7
10.0.0.0Network 10.0.0.1First usable 10.0.0.254Last usable 10.0.0.255Broadcast

10.0.0.7 is host 7 in this block.

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.