How to Find IP Address Ranges Owned by a Company

If you have a firewall, you may want to whitelist and/or blacklist some IPs depending in the origin. Usually it’s easy to find the owner of an IP address, but how can you find the IP address(es) registered by one specific company ?

Let’s say you want to whitelist Technorati bot.

A simple way is to go to http://bgp.he.net/ and enter the company name (e.g. technorati). It will return the IP list as follows:

Result Description
AS16936 Technorati, Inc.
208.66.66.0/23 Technorati, Inc.
208.66.65.0/24 Technorati, Inc.
208.66.64.0/24 Technorati, Inc.
208.66.64.0/22 Technorati, Inc.

I understand the AS entries correspond to the Internet provider, and the IP address ranges can be added to your firewall (I use CloudFlare service)  whitelist.

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6 Comments
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Snork
Snork
8 years ago

Sweet! I have been sifting through Apache logs and banning hosting/VPS/colo companies from my web site by individual ranges… this will hopefully help dump entire companies in a short time… thanks!

GOPI
GOPI
5 years ago

i cant find company in usa pls tell me it is located in usa massachest or it is scam

Limelight Networks
Limelight Networks
5 years ago

dd

Sean Lang
4 years ago

@Snork You do understand that people route regular traffic through VPS & colocation centers, right? VPNs are a thing that exists.

Ram Awadh Sharma
Ram Awadh Sharma
4 years ago

please lets how to find ip address of the company and in one ip code all companies should be displayed on the net

William R Marchand
3 years ago

@Sean Lang VPN usually go through company network. Not a cheap VPS or colo.

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