nanog mailing list archives
RE: Detecting a non-existent domain
From: Kee Hinckley <nazgul () somewhere com>
Date: Tue, 23 Sep 2003 20:16:04 -0400
At 3:15 PM -0700 9/23/03, David Schwartz wrote:
How would you do this before? Does an A record for a hostname mean that ahost with that name exists? If so, then all *.com 'hosts' now 'exist'. If not, what did you mean by exist before?
Okay, let's be very specific. I need to know if a given name has either A or MX records which are *not* the same as those provided by the a wildcard in the appropriate TLD.
The answer so far seems to be to query *.TLD, nab all the records, and then compare them all the results you get back from querying the domain. If there is anything that doesn't match, you are in the clear. (Modulo internal networks and localhost and all those fun tricks of course--but that's a different problem.)
The fact that this is a single IP comparison with Verisign today presumably does not preclude the wonders of MX records, CNAME's, multiple A records and all of that in the future.
-- Kee Hinckley http://www.messagefire.com/ Next Generation Spam Defense http://commons.somewhere.com/buzz/ Writings on Technology and Society I'm not sure which upsets me more: that people are so unwilling to accept responsibility for their own actions, or that they are so eager to regulate everyone else's.
Current thread:
- Detecting a non-existent domain Kee Hinckley (Sep 23)
- Re: Detecting a non-existent domain Dominic J. Eidson (Sep 23)
- RE: Detecting a non-existent domain David Schwartz (Sep 23)
- RE: Detecting a non-existent domain Kee Hinckley (Sep 23)
- RE: Detecting a non-existent domain David Schwartz (Sep 23)
- RE: Detecting a non-existent domain David Schwartz (Sep 23)
- Re: Detecting a non-existent domain Daniel Roesen (Sep 23)
- Re: Detecting a non-existent domain Dominic J. Eidson (Sep 23)
- Re: Detecting a non-existent domain Jack Bates (Sep 23)
- RE: Detecting a non-existent domain David Schwartz (Sep 23)
- Re: Detecting a non-existent domain Daniel Roesen (Sep 23)
- Re: Detecting a non-existent domain Joe Abley (Sep 23)
- RE: Detecting a non-existent domain Kee Hinckley (Sep 23)
- RE: Detecting a non-existent domain David Schwartz (Sep 23)
- Message not available
- Re: Detecting a non-existent domain Kee Hinckley (Sep 24)
- RE: Detecting a non-existent domain alex (Sep 26)