Search Again: Re: Reverse DNS From: Men & Mice Support Date: Wednesday, December 5, 2001 Time: 1:01:47 am At 10:31 PM -0800 12/4/01, Robert Ameeti wrote: >>I have the following IP's delegated by my ISP to my DNS servers. >> >>Client 1 >> >>209.91.118.144 - 209.91.118.151 >>207.148.164.200 - 207.148.164.207 >> >>My ISP states: >> >>"Make sure that this Reverse DNS Zone is set up on your server: >>200-29.164.148.207.in-addr.arpa" > >Where does the 200-29 come from in the above Reverse DNS? (I'm >needing to do similar stuff) > >I see that 207.148.164.200 gets reversed to 164.148.207.in-addr.arpa >but I don't understand the prefixed part. This comes from the classless subnet delegation. A classless subnet reverse zone has an arbitrary name. It doesn't actually have to end in "in-addr.arpa.", though they usually do. The name is assigned by the ISP or NSP, who presumably controls the larger classed reverse zone where the "delegation" (which doesn't actually have to be a real delegation) takes place. Let me give some examples. Below are three different ways the given subnet could have been delegated, showing what the ISP would have in their 164.148.207.in-addr.arpa reverse zone. 1) The method used in this particular case: 200-29.164.148.207.in-addr.arpa. NS ns1.wavefront.ab.ca. 200-29.164.148.207.in-addr.arpa. NS ns2.wavefront.ab.ca. 201.164.148.207.in-addr.arpa. CNAME 201.200-29.164.148.207.in-addr.arpa. 202.164.148.207.in-addr.arpa. CNAME 202.200-29.164.148.207.in-addr.arpa. 203.164.148.207.in-addr.arpa. CNAME 203.200-29.164.148.207.in-addr.arpa. 204.164.148.207.in-addr.arpa. CNAME 204.200-29.164.148.207.in-addr.arpa. 205.164.148.207.in-addr.arpa. CNAME 205.200-29.164.148.207.in-addr.arpa. 206.164.148.207.in-addr.arpa. CNAME 206.200-29.164.148.207.in-addr.arpa. 2) A method that's perhaps a little easier to read: wavefront.164.148.207.in-addr.arpa. NS ns1.wavefront.ab.ca. wavefront.164.148.207.in-addr.arpa. NS ns2.wavefront.ab.ca. 201.164.148.207.in-addr.arpa. CNAME 201.wavefront.164.148.207.in-addr.arpa. 202.164.148.207.in-addr.arpa. CNAME 202.wavefront.164.148.207.in-addr.arpa. 203.164.148.207.in-addr.arpa. CNAME 203.wavefront.164.148.207.in-addr.arpa. 204.164.148.207.in-addr.arpa. CNAME 204.wavefront.164.148.207.in-addr.arpa. 205.164.148.207.in-addr.arpa. CNAME 205.wavefront.164.148.207.in-addr.arpa. 206.164.148.207.in-addr.arpa. CNAME 206.wavefront.164.148.207.in-addr.arpa. 3) A method that doesn't involve an actual delegation: 201.164.148.207.in-addr.arpa. CNAME 201.rev.wavefront.ab.ca. 202.164.148.207.in-addr.arpa. CNAME 202.rev.wavefront.ab.ca. 203.164.148.207.in-addr.arpa. CNAME 203.rev.wavefront.ab.ca. 204.164.148.207.in-addr.arpa. CNAME 204.rev.wavefront.ab.ca. 205.164.148.207.in-addr.arpa. CNAME 205.rev.wavefront.ab.ca. 206.164.148.207.in-addr.arpa. CNAME 206.rev.wavefront.ab.ca. In fact, method 3 doesn't even require a reverse zone separate from the forward zone - the PTR records can actually be entered right alongside the A records. ____________________________________________________________________ Chris Buxton Men & Mice support@menandmice.com Making DNS Easy

Messages In This Thread: Reverse DNS by Warren Michelsen on Oct 30, 1999 at 5:41:00 pm Re: Reverse DNS by Men & Mice Support on Oct 30, 1999 at 6:05:00 pm Re: Reverse DNS by Warren Michelsen on Oct 30, 1999 at 6:32:00 pm Re: Reverse DNS by Men & Mice Support on Oct 30, 1999 at 9:00:00 pm Reverse DNS by Caio James on Jun 29, 2000 at 8:23:23 pm Re: Reverse DNS by Men & Mice Support on Jun 29, 2000 at 11:27:26 pm Re: Reverse DNS by Caio James on Jun 29, 2000 at 11:42:19 pm Re: Reverse DNS by Caio James on Jun 29, 2000 at 11:47:06 pm Re: Reverse DNS by Caio James on Jun 29, 2000 at 11:57:17 pm Re: Reverse DNS by Men & Mice Support on Jun 30, 2000 at 1:25:25 am Re: Reverse DNS by Caio James on Jun 30, 2000 at 1:41:36 am Re: Reverse DNS by Men & Mice Support on Jun 30, 2000 at 1:57:37 am Re: Reverse DNS by Caio James on Jun 30, 2000 at 10:34:32 am Re: Reverse DNS by Global Homes Webmaster on Jun 30, 2000 at 11:32:04 am Re: Reverse DNS by Caio James on Jun 30, 2000 at 11:40:25 am Re: Reverse DNS by Global Homes Webmaster on Jun 30, 2000 at 12:57:28 pm Re: Reverse DNS by Men & Mice Support on Jun 30, 2000 at 4:22:19 pm Re: Reverse DNS by Mark Russon on Jul 1, 2000 at 1:48:56 pm Re: Reverse DNS by Jerry Pasker on Jul 1, 2000 at 3:48:51 pm Re: Reverse DNS by Jerry Pasker on Jul 1, 2000 at 4:03:01 pm Re: Reverse DNS by Men & Mice Support on Jul 2, 2000 at 1:33:42 am Reverse DNS by Paul Didzerekis on May 2, 2001 at 1:53:19 pm Re: Reverse DNS by Global Homes Webmaster on May 2, 2001 at 3:15:53 pm Re: Reverse DNS by Jim Grisham on May 3, 2001 at 5:47:38 pm Re: Reverse DNS by Global Homes Webmaster on May 3, 2001 at 6:09:12 pm Re: Reverse DNS by Men & Mice Support on May 3, 2001 at 7:08:22 pm Reverse DNS by Andrew Schmiechen on Jun 21, 2001 at 1:28:00 pm Re: Reverse DNS by Global Homes Webmaster on Jun 21, 2001 at 3:12:52 pm reverse DNS by Paul Didzerekis on Jun 21, 2001 at 3:43:12 pm Re: reverse DNS by Men & Mice Support on Jun 21, 2001 at 10:14:41 pm Re: reverse DNS by Paul Didzerekis on Jun 22, 2001 at 11:33:50 am Reverse DNS by Dan Tappin on Dec 4, 2001 at 8:01:31 am Re: Reverse DNS by Men & Mice Support on Dec 4, 2001 at 10:22:14 am Re: Reverse DNS by Robert Ameeti on Dec 4, 2001 at 10:32:07 pm Re: Reverse DNS by Men & Mice Support on Dec 5, 2001 at 1:01:47 am Re: Reverse DNS by Piero Marchetti on Feb 20, 2002 at 1:00:49 pm Re: Reverse DNS by Men & Mice Support on Feb 20, 2002 at 2:11:27 pm Re: Reverse DNS by Piero Marchetti on Feb 21, 2002 at 1:48:25 am Re: Reverse DNS by Men & Mice Support on Feb 21, 2002 at 12:04:54 pm Re: Reverse DNS by Piero Marchetti on Feb 22, 2002 at 4:22:28 am Re: Reverse DNS by Men & Mice Support on Feb 22, 2002 at 12:46:12 pm Re: Reverse DNS by Piero Marchetti on Feb 26, 2002 at 3:24:25 am reverse dns by Steve Nowacki on Jul 29, 2003 at 10:02:19 am Re: reverse dns by Len Conrad on Jul 29, 2003 at 10:16:15 am Re: reverse dns by Steve Nowacki on Jul 30, 2003 at 6:38:26 am Re: reverse dns by Len Conrad on Jul 30, 2003 at 7:45:23 am Reverse DNS by Larry Scott Hastings on Feb 11, 2005 at 1:52:38 pm Re: Reverse DNS by Men & Mice Support on Feb 11, 2005 at 4:22:20 pm Re: Reverse DNS by Larry Scott Hastings on Feb 14, 2005 at 10:40:02 am Re: Reverse DNS by admin@gippy.net on Feb 14, 2005 at 10:48:03 am Re: Reverse DNS by Larry Scott Hastings on Feb 14, 2005 at 1:14:07 pm Re: Reverse DNS by Men & Mice Support on Feb 15, 2005 at 7:09:31 am Re: Reverse DNS by Larry Scott Hastings on Feb 18, 2005 at 11:43:51 am Re: Reverse DNS by Men & Mice Support on Feb 19, 2005 at 8:13:59 am Re: Reverse DNS by Larry Scott Hastings on Feb 21, 2005 at 10:37:27 am Re: Reverse DNS by Men & Mice Support on Feb 21, 2005 at 2:47:51 pm Re: Reverse DNS by Larry Scott Hastings on Feb 23, 2005 at 1:29:40 pm Re: Reverse DNS by Men & Mice Support on Feb 23, 2005 at 3:50:29 pm Re: Reverse DNS by Michael Wise on Feb 23, 2005 at 3:55:11 pm