I did a few more probes which you might be interested in. First, I tried a transfer of the 16.207.IN-ADDR.ARPA zone: $ named-xfer -z 16.207.IN-ADDR.ARPA -f temp -s 1 primary.ctonline.net named-xfer: [220.127.116.11] not authoritative for 16.207.IN-ADDR.ARPA, SOA query got rcode 0, aa 0, ancount 0, aucount 9 which is not surprising, since if I ask uunet: $ named-xfer -z 16.207.IN-ADDR.ARPA -f temp -s 1 AUTH00.NS.UU.NET I get a complete file back. The problem is, in that file is your class C: 240 IN NS auth00.ns.uu.net. IN NS auth50.ns.uu.net. and if I get 240.16.207.IN-ADDR.ARPA from uunet: $ named-xfer -z 240.16.207.IN-ADDR.ARPA -f temp -s 1 AUTH00.NS.UU.NET I get back: $ more temp ; BIND version named 4.9.3-P1 Sun Feb 25 14:04:07 EST 1996 ; BIND version firstname.lastname@example.org:/usr/src/picasso/BUILD/bind-4.9.3/named ; zone '240.16.207.IN-ADDR.ARPA' last serial 1 ; from 18.104.22.168 at Sat Sep 21 01:07:02 1996 $ORIGIN 16.207.IN-ADDR.ARPA. 240 IN SOA auth00.ns.uu.net. hostmaster.UU.NET. ( 960118 21600 3600 1728000 21600 ) IN NS auth00.ns.uu.net. IN NS auth50.ns.uu.net. which says nothing about your ips. Note that if I do a named-xfer of the 240.16.207.IN-ADDR.ARPA zone directly from your server, I do see that you have the records set up, but this won't help anyone over the Internet at large.Previous email.
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