Posts tagged whois

determine ASN from shell

posted on 2016-06-29 01:35

whois can actually use different whois servers for querying. Their output differs, but whois.cymru.com is pretty decent:

whois -h whois.cymru.com <IP-OR-ASN>

I.e.

sjas@zen:~$ whois -h whois.cymru.com $(host sjas.de | head -1 | awk '{print $4}')
AS      | IP               | AS Name
24940   | 78.47.176.149    | HETZNER-AS , DE

In reverse, for looking up which organization is behind a specific AS number:

sjas@zen:~$ whois -h whois.cymru.com AS24940 | tail -1
HETZNER-AS , DE

Downside is, it will not lookup domains, only IP's or ASN's.

If no whois server is specified via the -h flag, whois.arin.net will be used for domains, IP addresses and ASN numbers. whois.cymru.com is however more terse and often more preferable.

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