Mapping prefixes to ASes
Current implementation consults whois.ripe.net
- straightforward, fast, no network delays to server
… but routing registry not necessarily correct
- unregistered prefixes, outdated or multiple route objects
Better: consult real routing tables, e.g. RIS
- more complicated, next version
Manual study: compare 1 day IRR results with RIS
- 9% no route object in IRR, almost always found in RIS
- 5% show some difference with RIS (but often same organisation) bulk of assignments correct!
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