- hostname->hostinfo NAMEprocedure
- ip->hostinfo IPADDRprocedure
- service-name->servinfo NAMEprocedure
- service-port->servinfo NUMprocedure
- protocol-name->protoinfo NAMEprocedure
- protocol-number->protoinfo NUMprocedure
These lookups correspond to those described in Short and sweet, but return a full record. The entire record is filled in a single system call.