Removing Internet Routing
ISP’s rely on the Internet Routing Registry (IRR) records to further validate the route announcements. To Avoid issues, make sure the IPv4 you purchase has all IRR and BGP records removed.
Working through the Internet Routing Registry can be complicated. We have worked closely with the source registries over the years to develop a better method to properly clean up old route records. To get assistance from our team, please email firstname.lastname@example.org or contact us
If you prefer to try to tackle this project on your own, please follow the directions to remove all routing objects, announcements and BGP records for your IPv4 block
Open up IRR Explorer, and search the IPv4 block you want to transfer: http://irrexplorer.nlnog.net/search. You will likely see several listings on this page. If your entire IPv4 block is listed, including what you want to transfer out, you will want to clean up the records.
The columns will have several listed source registries that are hosting routing records. Some examples of source registries are: arin, radb, level3 and nttcom.
Removing Legacy Route Objects
If the message under the advice column says Not seen in BGP, but (legacy?) route-objects exist, consider clean-up , do the following:
Also in email the record listed in RADB https://www.radb.net/query?
If the message under the advice column says Multiple route-object exist with different origins, do the following:
Removing BGP Announcements
In IRR Explorer, if it says Prefix in DFZ, but no route-object with correct origin anywhere or Looks good: BGP origin consistent with AS in route-objects