Re: Question about DNS naming conventions

[Steven Champeon <schampeo () hesketh com>]

on Tue, Feb 11, 2025 at 08:30:47PM -0500, John Levine wrote:
> There is a great deal of variation in the details of the names beyond the fact
> that they embed all or part of the IP address.  I know a guy who has collected
> a lot of regular expressions to match them.  See http://enemieslist.com

Feel free to reach out offlist, always happy to help.

For the record, since 2003 I've been collecting and classifying PTR
naming conventions and as of the latest build we have pats for around
97.6% of IPv4's PTR space (roughly 30% of IPv4 has PTR records). We
license the data to social networks, antispam appliance vendors, security
research firms and the like, mostly for antispam applications but not always. 

Here's a fun coverage map to give you an idea (h/t XKCD):

 http://enemieslist.com/map.html

Steve

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Internet security and antispam hostname intelligence: http://enemieslist.com/