ftphosts - ftpd individual user host access file
The ftphosts file is used to allow or deny access to certain accounts from various hosts.
allow <username> <addrglob> [<addrglob> ...] Only allow host(s) matching <addrglob> to log in as <username>.
deny <username> <addrglob> [<addrglob> ...] Always deny host(s) matching <addrglob> to log in as <username>.
FTPLIB/ftphosts