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====== Ubuntu - Networking - Configuration - IP to ASN Mapping ======

The ASN (Autonomous System Number) is a globally unique number assigned by a registrar for the purposes of Internet routing, To determine this issue the following command:

**NOTE**:  The date and time part of the query is for the date / time you want to query.

<code bash>
whois -h whois.cymru.com " -v 5.42.134.35 2010-05-12 12:00:01 GMT"
</code>

returns:

<code bash>
AS      | IP               | BGP Prefix          | CC | Registry | Allocated  | Info                    | AS Name
8680    | 5.42.134.35      | 5.42.132.0/22       | GB | ripencc  | 2012-05-16 | 2010-05-12 12:00:01 GMT | , GB
</code>

To query for some basic AS information directly:

<code bash>
whois -h whois.cymru.com " -v AS8680"
</code>

returns:

<code bash>
AS      | CC | Registry | Allocated  | AS Name
8680    | GB | ripencc  |            | , GB
</code>


----

===== References =====

  * https://asn.cymru.com/
  * https://www.ultratools.com/tools/asnInfoResult?domainName=8.8.8.8