North American Network Operators Group
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RE: Detecting a non-existent domain
- From: alex
- Date: Fri Sep 26 12:09:38 2003
> 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.
Alg 101
1. Seed the isWildCard[] probability array.
Generate N random strings. Attach ".NET" or ".COM" to them. Get records for
them. Compare records to each other assigning them probability of being a
wildcard based on the repetitiveness of the data.
2. Query domain name in question.
Compare the result with isWildCard[] probability array.
Alex
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