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--- who_is_using_this_ip_address [2014/02/09 13:14] – [Basic Steps] samer
+++ who_is_using_this_ip_address [2014/02/09 14:15] – [Who is Using This IP Address?] samer
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 ====== Who is Using This IP Address? =====
-A frequent question that faces network administrators or application developers consists in identifying //who is using a specific public IP address//. This information can be utilized for instance to perform user localization and enable location-based services or user access control. In this context, a main technical challenge is to associate the IP address or prefix with its corresponding Autonomous System (AS).
+A frequent question that faces network administrators or application developers consists in identifying //who is using a specific public IP address//. This information can be utilized for instance to perform user localization and enable location-based services or user access control. In this context, a main technical challenge is to associate an IP address or prefix with its corresponding Autonomous System (AS).
 ===== -- Limitations of the whois Information =====
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 Here are some hints and recipes to implement a server that maps IP prefixes with AS numbers based on BGP information.
-==== Basic Steps ====
+==== -- Basic Steps ====
 Start by downloading raw BGP data collected by RIPE NCC servers from http://www.ripe.net/data-tools/stats/ris/ris-raw-data. For example, the latest data file from RRC0 (Amsterdam) is always available on http://data.ris.ripe.net/rrc00/latest-bview.gz.
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 Now you can use your favorite scripting language to extract IP to AS mappings and perform a best prefix match.
+==== -- Software Tools ====
+Fortunately, existing software tools may help you in the process of implementing you own BGP-based IP to AS mapping service. Consider taking a look at:
+  - [[http://cpansearch.perl.org/src/TPODER/Net-NfDump-0.12/examples/download_asn_db | Net-NfDump]]: a perl library that makes use of the [[http://search.cpan.org/~tpoder/Net-IP-LPM-0.02/ | Net::IP::LPM]] implementation of Longest Prefix Match algorithm.
+  - [[https://github.com/CIRCL/IP-ASN-history | IP-ASN-history]]: a client/server (with a client web interface) software to store efficiently the history of BGP announces and quickly lookup IP addresses origins.
+  - [[http://pwhois.org/server.who | pwhois]]: a client/server software that makes use of a PostgreSQL database to store routing information. FIXME Did not succeed to install it on Mac OS X 10.9.1.