IPData Tools
IP / CIDR Calculator
Paste any IP address in CIDR notation (e.g. 192.168.1.0/24) and instantly see the subnet mask, wildcard mask, network address, broadcast address, first and last usable hosts, total address count, and IP class. Essential for network engineers, sysadmins, and developers working with cloud VPCs.
Common subnet sizes
/24256 addresses · 254 usable — typical home/office LAN
/23512 addresses · 510 usable
/1665,536 addresses · 65,534 usable — large corporate
/304 addresses · 2 usable — point-to-point links
/321 address · Single host route