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by floatboth 3113 days ago
How do these companies know who to contact for a given IP address? Do ISPs just cooperate with them?
1 comments

WHOIS records.

Though that only tells you the RIPE member for it.

They might have still leased the IP elsewhere (which is totally informal, if you operate a IP range all you need is a letter saying you can do it with the owner's signature)