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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Finding ASN from IP address
Avleen, > I want to create a mapping of IP addresses to ASN, for a specific like > of IP addresses. Eg: > 1.2.3.4 > 12.34.56.78 > > etc, gathered from my system logs. > > What is the best way of doing this? > > I thought about something along the lines of: > install routing software (zebra?) > pass software the IP's, get it to spit back a string from which I can > grab the ASN Starting from the routing table is indeed the best approach. We recently studied this problem and found that an approach based on whois queries to an IRR only returns the correct result in ~80% of the cases, whereas using routing tables returns the correct result in ~99% of the cases. See: http://www.ripe.net/ripe/meetings/ripe-46/presentations/ripe46-tt-as-traceroutes.pdf for more details. We're expanding the software used for this study into a public service right now and hope to announce this to the public shortly. Henk ------------------------------------------------------------------------------ Henk Uijterwaal Email: [email protected] RIPE Network Coordination Centre WWW: http://www.ripe.net/home/henk P.O.Box 10096 Singel 258 Phone: +31.20.5354414 1001 EB Amsterdam 1016 AB Amsterdam Fax: +31.20.5354445 The Netherlands The Netherlands Mobile: +31.6.55861746 ------------------------------------------------------------------------------ That problem that we weren't having yesterday, is it better? (Big ISP NOC)
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