The RPKI Repository Delta Protocol (RRDP, RFC8182), is used for fetching RPKI objects.
The repository at this URL contains the certificates, manifests, Route Origin Authorisations (ROAs) and other RPKI objects published by the RIPE NCC. Various open source relying party software packages, also known as RPKI validators, are available to download, verify and process this RPKI data.
An archive of historic RPKI data is available at https://ftp.ripe.net/rpki/