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.

Network address 10.0.0.0
As an integer 167772160
In hex 0A.00.00.00
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
10.0.0.0Network 10.0.0.1First usable 10.0.0.254Last usable 10.0.0.255Broadcast

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.