FAHAQ

CIDR Calculator

Convert CIDR notation to an IP range and netmask.

  • Normalized CIDR10.0.0.0/24
  • First address10.0.0.0
  • Last address10.0.0.255
  • Address range10.0.0.0 – 10.0.0.255
  • Netmask255.255.255.0
  • Total addresses256

Free CIDR calculator. Enter a CIDR block such as 10.0.0.0/24 to get the first and last IP address, the total number of addresses and the netmask. Fast, private and runs in your browser.

How to use the CIDR Calculator

  1. 01Type a CIDR block such as 10.0.0.0/24.
  2. 02See the address range, total addresses and netmask instantly.
  3. 03Copy the results.

Frequently asked questions

What is CIDR notation?

CIDR (Classless Inter-Domain Routing) notation writes a network as an IP address followed by a slash and a prefix length, like 10.0.0.0/24. The prefix says how many leading bits identify the network.