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After having serious problems (DNS incident) I found out an IP address of a machine. Is it in any way possible to contact the owner without knowing anything else like email, domain name or website? I scanned it via nmap and found some services like:

21/tcp   open     ftp
22/tcp   open     ssh
53/tcp   open     domain
80/tcp   open     http
81/tcp   open     hosts2-ns
135/tcp  filtered msrpc
139/tcp  filtered netbios-ssn
445/tcp  filtered microsoft-ds
3306/tcp open     mysql
8081/tcp open     blackice-icecap

I thought on leaving something in one of the log via a ssh connection test or one of the other services or something like that.

How can I leave a message that is seen on such a system?

Warm regards

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  • To make it clear, I want to leave MY contact informations.
    – brubaker
    Oct 16, 2014 at 17:07
  • How do you know they don't want those open? Those look like pretty reasonable services.
    – ceejayoz
    Oct 16, 2014 at 17:07
  • I don't care if they want them to be open. That is not my business. I just want to use them to contact them - sent my contact informations for another reason.
    – brubaker
    Oct 16, 2014 at 17:08
  • I just want to give the server/machine admin the possibility to reach out to me if they want to.
    – brubaker
    Oct 16, 2014 at 17:15

1 Answer 1

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Start by asking ARIN using the WHOIS tool (it's in the upper right corner)

http://whois.arin.net/ui

They'll point you to the right affiliate (APNIC or RIPE) if it's not an American IP. You'll either get the Company name (and maybe a Point of Contact, although those are usually outdated) that owns the IP or the name of the ISP hosting the site. I've also found SANS lookup tool useful to check if anyone else has noticed bad traffic on it.

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2
  • It should be noted that SANS will give you the owner of the IP block, not necessarily an individual server.
    – ceejayoz
    Oct 16, 2014 at 17:20
  • Can you offer a method to directly contact the IP address owner?
    – brubaker
    Oct 16, 2014 at 17:42

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