What is a routing registry?
From Wikipedia https://en.wikipedia.org/wiki/Internet_Routing_Registry
The Internet routing registry works by providing an interlinked hierarchy of objects designed to facilitate the organization of IP routing between organizations, and also to provide data in an appropriate format for automatic programming of routers. Network engineers from participating organizations are authorized to modify the Routing Policy Specification Language (RPSL) objects, in the registry, for their own networks. Then, any network engineer, or member of the public, is able to query the route registry for particular information of interest.
RFC7682 Considerations for Internet Routing Registries (IRRs) and routing Policy Configuration
General IRR Information
Includes links to various registries, FAQs, and other info
Seattle Internet Exchange IRR Tutorial
NANOG Routing registry tutorial
A Quickstart Guide to Documenting Your Prefixes with IRR. This mainly uses the older ARIN e-mail templates.
Arin’s userguide for working with their IRR
Notes on working with ARINs web-based
Other Regional Registries
African Network Coordination Centre (AFRNIC)
Asian-Pacific Network Coordination Centre (APNIC)
American Registry for Internet Numbers (ARIN)
Latin American and Caribbean Internet Addresses Registry (LACNIC)
Reseaux IP Eauropeens Network Coordination Centre (RIPE NCC)
A collection of tools which allow ISPs to easily track, manage, and utilize IPv4 and IPv6 BGP routing information stored in Internet Routing Registry (IRR) databases. Some of these tools include automated IRR data retrieval, update tracking via CVS, e-mail notifications, e-mail based notification for ISPs who still do human processing of routing information, and hooks for automatically deploying prefix-lists on routers.
The RADB whois server provides information collected from all the registries that form part of the Internet Routing Registry.
Internet Routing Registry daemon version 4 is an IRR database server, processing IRR objects in the RPSL format.