ASN to IP Mapping

Bob Evans bob at FiberInternetCenter.com
Sat Mar 7 21:37:47 UTC 2015


Step 1: Input an IP prefix for the originating ASN of a prefix
https://radar.qrator.net

Step2: Check the RIR whois (as stated below) for confirmation as to who's
assigned space.

Thank You
Bob Evans
CTO




> On Sat, Mar 7, 2015 at 12:37 PM, Andrew Iwamoto <
> aiwamoto at 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
>




More information about the NANOG mailing list