Sep 30

Geek Tip – Find out more about an AS number

by in ripe

I was just chatting to Niall about RIPE assignments and members and he gave me a nice little command to check data.

You need to run this in a shell:
whois -i origin AS39122 -h whois.ripe.net

If the RIPE member in question has been keeping their data current you should get back information on all their IP assignments (or is that allocations? I always mix them up!)

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2 Responses to “Geek Tip – Find out more about an AS number”

  1. From Niall:

    Might be helpful to mention that to get the AS number for an ISP, you can do a whois on any of their IP addresses. The AS number will be the origin field.
    The above command does an inverse lookup on the origin field.

    Posted on September 30, 2007 at 6:18 pm #

  2. From Michele Neylon:

    True. I should have included something about that.
    Thanks!

    Posted on September 30, 2007 at 6:22 pm #