<package name="apache2-mod_asn" project="Apache:Modules">

  <title>mod_asn looks up the AS and network prefix of IP address</title>

  <description>

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mod_asn is an Apache module doing lookups of the autonomous system (AS)[1], and

the network prefix[2] which contains a given (clients) IP address.

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It is written with scalability in mind. To do high-speed lookups, it uses the

PostgreSQL ip4r datatype[3] that is indexable with a Patricia Trie[4] algorithm to

store network prefixes. This is the only algorithm that can search through the

~250.000 existing prefixes in a breeze.

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It comes with script to create such a database (and keep it up to date) with

snapshots from global routing data - from a router's "view of the

world", so to speak.

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Apache-internally, the module sets the looked up data as env table variables,

for perusal by other Apache modules. In addition, it can send it as response

headers to the client.

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It is published under the Apache License, Version 2.0.

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Source code can be obtained here: http://svn.poeml.de/svn/mod_asn/

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Author: Peter Poeml

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Links:

[1] http://en.wikipedia.org/wiki/Autonomous_system_(Internet)

[2] http://en.wikipedia.org/wiki/Subnetwork

[3] http://pgfoundry.org/projects/ip4r/

[4] http://en.wikipedia.org/wiki/Radix_tree

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  </description>

  <person userid="hostmaster" role="maintainer"/>

  <url>http://mirrorbrain.org/</url>

</package>

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