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Public IP addresses

Hello everyone,


I do have a list with public Ip addresses that belong to the company I am working for. Unfortunately, that excel sheet where it supposed to have each ip belongs to who is NOT registered !  And therefore i am willing to validate each ip addresses if it is reserved by someone or it is free .. And frankly I do not know how to check that professionally.


i need your help to assist me on how to validate the ip addresses. If they are in use or not and belongs to who as well



thank you

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Each regional Internet

Each regional Internet Registry (RIR) has a whois page that allows you to enter an IP address (or subnet) and receive confirmation of the registered address assignee.

ARIN (North America) -

RIPE (Europe, Middle East, parts of Asia) -

APNIC (Asia Pacific) -

...etc. for AFRNIC and LACNIC.

Here's a link to a list of country codes and associated registries:

...and a map: