Look up mac address vendor, IP or domainname Search ex. 00-11-22-33-44-55, 220.127.116.11, AS21195 or idg.se
With this free online Subnet / VLSM / CIDR calculator you can subnet IPv4 addresses using the fields below.
The result below will show you information about the subnetted network,
such as number of addresses in span, the first and last useable address,
the reverse DNS for the IP etc.