CIDR calculator

Runs entirely in your browser. Useful for reading IP reports, ACLs, and route announcements.

CIDR block

Result

Canonical CIDR

2600:1f70:6000:0000:0000:0000:0000:0000/40

Version

IPv6

Prefix

/40

Network

2600:1f70:6000:0000:0000:0000:0000:0000

Broadcast

n/a (IPv6)

First address

2600:1f70:6000:0000:0000:0000:0000:0000

Last address

2600:1f70:60ff:ffff:ffff:ffff:ffff:ffff

Netmask

ffff:ffff:ff00:0000:0000:0000:0000:0000

Wildcard

n/a

Total addresses

309485009821345068724781056

Usable hosts

309485009821345068724781056