CIDR Calc

CIDR to IP range.

Paste a CIDR block and instantly see network, broadcast, and usable host range for IPv4.

Open CIDR calculatorFull calculator

What you get

  • Network and broadcast addresses.
  • First and last usable hosts.
  • Total and usable host counts.

Example

CIDR: 172.16.0.0/12

Range

172.16.0.0 – 172.31.255.255

Tip

/31 and /32 are handled correctly for point-to-point links and single hosts.