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@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