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I'm trying to find an ISP or IP address by geographic location, Is this possible?

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3 Answers 3

up vote 4 down vote accepted

You can't get the kind of detail you want, unless you are the ISP and they are your client.

On Law and Order when they make one call to find out where an email was sent from actually takes weeks and involved warrants and cooperation from the ISP and sifting through logs.

The reason is that IP blocks are handed to ISPs and they are free to give them to whoever they wish without reporting it back to a central location.

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Since the reverse lookup is possible (accuracy varies) using IP2Location databases then there is no reason for you not to be able to find IP (and using IP the ISP) by location.

  1. Get one of the GeoIP databases - usually the most precise variant (IP2City or similar) includes latitude and longitude.
  2. Query by geographical location and get IP blocks
  3. Run whois on IP to find out who is it assigned to
  4. Filter the result against known ISP list
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I think https://www.countryipblocks.net/ip_aggregation_beta.php is exactly what you are looking for.

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