On Mon, Dec 19, 2005 at 09:22:03PM -0500, Danny Mayer <mayer at ntp.isc.org> wrote a message of 11 lines which said: > You are allowed as many PTR records for the same IP as you > want. However there are no known applications that will use more > than the first one. Sorry, I believe that this is wrong. TCP wrappers (tcpd) do it.