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--- networking:asn_autonomous_system_number:find_a_specific_asn [2021/01/04 16:24] – created peter
+++ networking:asn_autonomous_system_number:find_a_specific_asn [2021/01/04 16:52] (current) – peter
@@ Line 1: / Line 1: @@
 ====== 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
+   | 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/