Introductory information about the Internet Routing Registry can be found
here.
Another project for the analysis of the IRR has been developed by Siganos et
al. They published a paper [siganos-04-analyzing]
and they also make available an online service.
The Internet Systems Consortium is
currently in charge of the maintenance of the IRRToolSet, a suite of
tools to operate with routing policies in RPSL format.
IRRToolSet relies
on an IRR daemon for retrieving information
from the registry databases.