[178796] in North American Network Operators' Group
Re: ASN to IP Mapping
daemon@ATHENA.MIT.EDU (Rubens Kuhl)
Sat Mar 7 16:12:53 2015
X-Original-To: nanog@nanog.org
In-Reply-To: <SN2PR10MB00798D50B57797F7DADB82B2F61D0@SN2PR10MB0079.namprd10.prod.outlook.com>
Date: Sat, 7 Mar 2015 18:12:50 -0300
From: Rubens Kuhl <rubensk@gmail.com>
To: Andrew Iwamoto <aiwamoto@unleashed-technologies.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Sat, Mar 7, 2015 at 12:37 PM, Andrew Iwamoto <
aiwamoto@unleashed-technologies.com> wrote:
> Is there a tool or method to determine IP blocks assigned to an
> organization by ASN? I.e. if I have an organization's ASN number I want to
> know all blocks assigned to that ASN.
>
That's RIR/NIR-dependent, so you probably have to go thru all of them to
map all possible IP blocks. Other references suggested bgp.he.net that will
only list advertised networks, and IRRs will only have IRR-listed networks.
For instance, on ARIN for AS 15141:
http://whois.arin.net/rest/asn/AS15141
Find the organization name; click on the link
http://whois.arin.net/rest/org/BAUSCH-1.html
Find the networks link:
http://whois.arin.net/rest/org/BAUSCH-1/nets
Network ResourcesBAUSCH-LOMB (NET-161-242-0-0-1
<http://whois.arin.net/rest/net/NET-161-242-0-0-1.html>)161.242.0.0 -
161.242.255.255
Look for the other RIRs; rinse and repeat.
Rubens
