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====== Networking - ASN (Autonomous System Number) - Find a specific ASN ======

There are many search tools online such as https://www.ultratools.com/tools/asnInfo.

For example, searching for **Google** returns a number of ASNs.

{{:networking:asn_-_search_-_google.png?800|}}

<WRAP info>
**NOTE:**  This returns a number of ANS associated with Google.
</WRAP>


----

Alternatively:

<code bash>
dig google.com
</code>

returns:

<code bash>
; <<>> DiG 9.16.1-Ubuntu <<>> google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2531
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;google.com.			IN	A

;; ANSWER SECTION:
google.com.		300	IN	A	216.58.198.206

;; Query time: 24 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Mon Jan 04 15:55:10 GMT 2021
;; MSG SIZE  rcvd: 55
</code>

<WRAP info>
**NOTE:** This returns the IP Address 216.58.198.206.
</WRAP>


...then...

<code bash>
whois -h whois.cymru.com " -v 216.58.198.206"

AS      | IP               | BGP Prefix          | CC | Registry | Allocated  | AS Name
15169   | 216.58.198.206   | 216.58.198.0/24     | US | arin     | 2012-01-27 | GOOGLE, US
</code>

<WRAP info>
**NOTE:**  This shows that that Google IP is part of ASN 15169.
</WRAP>

----

===== References =====

http://networktools.nl/asinfo/