Global Resource Service (GRS)
The RIPE NCC operates mirrors of the other RIRs' databases as well as some of the major routing registries. Only operational data is stored based on the published statistics of authoritative resources from each RIR. The RIPE Whois service allows this set of mirrors to be queried as a single logical database and returns authoritative responses from the appropriate source.
 Glue Record
The IP address of a name server held at the Domain Name registry. Glue records are required when you wish to set the name servers of a domain name to a hostname under the domain name itself.