2.1.3 The RIPE Internet Routing Registry

The RIPE Internet Routing Registry (IRR) is part of a global distribution of databases by which network operators can publish their routing policies and their routing announcements so that other network operators can make use of the data. In addition to making Internet topology visible, the IRR is used by network operators to look up peering agreements, determine optimal policies, and more recently, to configure their routers.

Each RIR has its own IRR. There are also many independent IRRs, for example RADb. A resource holder can register their routing information in any of the IRR databases. Most of the larger IRRs mirror each others' routing information. Therefore, it is only necessary to enter this information into one IRR. 

Only resources allocated to the RIPE region can be registered in the RIPE IRR. 

The benefits of the IRR are only realised when registered routing policies are kept up-to-date, and reflect routing announcements in the 'real world'.