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Find the ASN number

Based on a IP address, e.g.:

$ ping

We find that maps to

Let's find the network range:

# -A Perform AS path lookup
traceroute -A

We find that two AS numbers, one for two administrative units of UK:

University of Kentuky/University of Kentucky, Communication Services AS23162/AS10437

Then we can look up the network range at a site like this:

An alternate way is to perform a specific whois search, using, a public routing registry:

$ whois -h

Here we find both the network range and the AS number:

  • route:
  • origin: AS23162

Now, let's see how many networks and hosts UK can have based on the route information.

linux/network-autonomous-system-numbers-asn.txt · Last modified: 2019/01/21 11:18 by seanburns