CIDR calculator
Runs entirely in your browser. Useful for reading IP reports, ACLs, and route announcements.
Result
Canonical CIDR
172.64.221.0/24
Version
IPv4
Prefix
/24
Network
172.64.221.0
Broadcast
172.64.221.255
First address
172.64.221.1
Last address
172.64.221.254
Netmask
255.255.255.0
Wildcard
0.0.0.255
Total addresses
256
Usable hosts
254