Identifying when netblocks have been assigned

Stephen Sprunk stephen at
Sat Sep 13 14:12:19 CDT 2008

Frank Bulk wrote:
> When I do that it lists the organization's AS, but not any netblocks
> associated with that AS.
> Frank
> -----Original Message-----
> From: Jake Mertel [mailto:jake at] 
> Frank,
> Add the > operator in front of the organizations ARIN ID when you do
> your WHOIS query and it will show all of the resources allocated to that
> organization.

Keep in mind that the "> OrgID" trick only works for allocations or 
assignments made directly by ARIN; it won't necessarily show you 
everything that was SWIPed to them, since many SWIPs are not tagged with 
an OrgID.  To find those, you have to search on the name of the customer 
and hope it shows up correctly in the CustName field.

Also, many companies end up with lots of OrgIDs, and many of them may 
not have the correct current name due to M&A activity.  Finding them all 
may take a while and isn't easily automated.


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