XOVER is a Network News Transfer Protocol (NNTP) command used to return information from a news server's overview ( NOV) database..
The XOVER command is documented in RFC 2980, a specification for Common NNTP Extensions authored by Stan O. Barber in October 2000. [1] A newer version of NNTP, specified in RFC 3977, formalized the XOVER extension with new OVER and LIST OVERVIEW.FMT commands. [2]