Andy Saykao wrote:
This might be a silly question but is there a tool somewhere that will
give me a list of IP's that are owned by a particular AS.
As an example, I might want to know which IP blocks belong to AS1234?
The RIPE IRR does this for europe at least, and I believe RIPE and ARIN collaborate on a US-centric equivalent. Those are based on ISPs keeping them up to date.

Or Robtex, or Fixed Orbit. Basically google for AS1234 and you'll find a few sites that collate peering and IP information from BGP collectors.
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