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linux:network-autonomous-system-numbers-asn

Find the ASN number

Based on a IP address, e.g.:

$ ping www.uky.edu

We find that 128.163.35.46 maps to www.uky.edu.

Let's find the network range:

# -A Perform AS path lookup
traceroute -A  128.163.35.46

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:

https://bgp.he.net/AS23162#_prefixes

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

$ whois -h whois.radb.net 128.163.35.46

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

  • route: 128.163.0.0/16
  • 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