How can I check who owns subnet x?

A. The allocation of IP subnets is centrally controlled and maintained and this central database can be queried to see who owns a certain subnet, and also which companies own which subnets.

ARIN is the non-profit organization which maintains this database and provides a web based whois program at

You can type in a subnet, e.g. 169.254 or a name, e.g. Microsoft.

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