As other posted noted the whois server depends on the geographical location-- arin.net handles only American IPs, ripe.net handles europe-asia, etc.

One way os to use the whois proxy at whois.geektools.com. It will determine and query the correct whois server for you.

Another way is to use the hostmaster email address which is present in the SOA record of the reverse domain. e.g. if the IP is 1.2.3.4, query for the SOA record of 3.2.1.in-addr.arpa. You can use Net::DNS to do this.

In reply to Re: Retrieve an email address of sysadmin only knowing the IP address by echo
in thread Retrieve an email address of sysadmin only knowing the IP address by dru145

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