PTR Configuration Question

[Stephane Bortzmeyer]

On Tue, Nov 30, 2004 at 11:52:50PM -0800,
 Yann Debonne <bind9-users at debonne.net> wrote 
 a message of 23 lines which said:

> So, what is that "80" digit, and how did it enter the picture?!

It comes from the upper zone (probably your ISP).

~ % dig +short 54.122.67.in-addr.arpa NS
ns1.pbi.net.
ns2.pbi.net.

~ % dig +short @ns1.pbi.net -x 67.122.54.85
85.80.54.122.67.in-addr.arpa.
   ^^
   They've apparently read RFC 2317 "Classless IN-ADDR.ARPA
   delegation" in a very creative and unusual way.