reverse DNS config is giving me fits

I am desperate for help on this as I have been struggling with it for weeks. :cry: What I am getting is completely inexplicable to me. I have 2 subnets for which I have set up for reverse DNS. One works and the other doesn't. I have been over the files a thousand times and cannot find why one works and the other doesn't. I am hoping another pair of eyes can spot what I cannot. The working network is 64-28.181.255.66.in-addr.arpa and the non-working one is 128-27.55.158.72.in-addr.arpa. Here are my config files: [code] $TTL 86400 64-28.181.255.66.in-addr.arpa. IN SOA xserveoda.181.255.66.in-addr.arpa. support.aimaudit.com. ( 2006020801 ; serial 2H ; refresh 2H ; retry 1W ; expiry 1D ) ; minimum 64-28.181.255.66.in-addr.arpa. IN NS ns1.comlanta.net. 64-28.181.255.66.in-addr.arpa. IN NS ns2.comlanta.net. 64-28.181.255.66.in-addr.arpa. IN NS xserveobd.aimaudit.com. 64-28.181.255.66.in-addr.arpa. IN NS xservetwo.aimaudit.com. 64-28.181.255.66.in-addr.arpa. IN NS xserveone.aimaudit.biz. 67 IN PTR aimwebserver.aimaudit.biz. 68 IN PTR 4dserverxp.aimaudit.biz. 69 IN PTR xserveone.aimaudit.biz. 70 IN PTR citrix02.aimaudit.biz. 71 IN PTR imageone.aimaudit.biz. 72 IN PTR imageone-raid.aimaudit.biz. 73 IN PTR imageone-raid-2.aimaudit.biz. [/code] [code] $TTL 86400 128-27.55.158.72.in-addr.arpa. IN SOA xserveoda.55.158.72.in-addr.arpa. support.aimaudit.com. ( 2006091802 ; serial 2H ; refresh 2H ; retry 1W ; expiry 1D ) ; minimum ; nameservers 128-27.55.158.72.in-addr.arpa. IN NS ns2.cl.bellsouth.net. 128-27.55.158.72.in-addr.arpa. IN NS ns3.cl.bellsouth.net. 128-27.55.158.72.in-addr.arpa. IN NS xserveodb.aimaudit.com. 128-27.55.158.72.in-addr.arpa. IN NS xservetwo.aimaudit.com. 128-27.55.158.72.in-addr.arpa. IN NS xserveone.aimaudit.biz. ;hosts 129 IN PTR xservehaa.dev.aimaudit.com. 130 IN PTR ImageONE-RAID.dev.aimaudit.com. 131 IN PTR aimwebserver.dev.aimaudit.com. 132 IN PTR 4dserverxp.dev.aimaudit.com. 133 IN PTR aimdlink1.dev.aimaudit.com. 134 IN PTR xraidc1.dev.aimaudit.com. 135 IN PTR xservehab.dev.aimaudit.com. [/code] FWIW, here is the typical 'dig' output. [code] dig -x 66.255.181.70 ; > DiG 9.2.2 > -x 66.255.181.70 ;; global options: printcmd ;; Got answer: ;; ->>HEADER> DiG 9.2.2 > -x 72.158.55.135 ;; global options: printcmd ;; Got answer: ;; ->>HEADER