Usage: sockaddr rfc [RFC Number] [IP Address]

  Tests a given IP address to see if it is part of a known
  RFC.  If the IP address belongs to a known RFC, return exit
  code 0 and print the status.  If the IP does not belong to
  an RFC, return 1.  If the RFC is not known, return 2.

Options:

  -s  Silent, only return different exit codes

Subcommands:

    list    Lists all known RFCs