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Should be possible using the ASN id of the IP address, and I think Domaintools provides this information and some other fields as well, although their API is no
by ThePhysicist 10y ago
Should be possible using the ASN id of the IP address, and I think Domaintools provides this information and some other fields as well, although their API is not free. That won't help with most VPNs though as they just rent servers from various providers, so you need some kind of active monitoring, which might be tricky to implement from a technical and legal point of view.
- toast0 10y agoIf you have a BGP feed, you can use that to go from IP -> ASN, otherwise, there are public bgp dumps [1]. Many networks renting servers are pretty simple to flag this way. [1] One source is http://www.routeviews.org/ http://www.routeviews.org/
- ThePhysicist 10y agoThanks for pointing this out, I couldn't find a way to get the ASN for free, so this is a great resource!