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Michele Neylon :: Pensieri

Michele Neylon :: Pensieri

Technology, Marketing, Domains, Thoughts

Geek Tip – Find out more about an AS number

September 30, 2007 by Michele Neylon 2 Comments

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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Filed Under: ripe Tagged With: geek, ips, networking, ripe

Michele is founder and CEO of Irish hosting provider and domain name registrar Blacknight. Read More…

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Comments

  1. Niall says

    September 30, 2007 at 6:18 pm

    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.

  2. Michele Neylon says

    September 30, 2007 at 6:22 pm

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

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