To the best of my knowledge there are two types of PTR/A Records.
For dailup prefixes, IPs used for DSL,Cable, etc PTR should be generated
and contain the IP to make it easier to block emails from that ranges.
For v6 prefixes you will probably want to do this programmatically with
e.g. powerdns (see createReverse in
https://doc.powerdns.com/authoritative/lua-records/functions.html)...
Doing 2**96 PTR records in Textfile is "impractical"
dig -x 2003:d6:cf31:8c00:b67a:f1ff:fedd:1d12
2.1.d.1.d.d.e.f.f.f.1.f.a.7.6.b.0.0.c.8.1.3.f.c.6.d.0.0.3.0.0.2.ip6.arpa.
86400 IN PTR p200300d6cf318c00b67af1fffedd1d12.dip0.t-ipconnect.de.
For hosts I prefer nameing conventions which contain exact enough
locations which helps debugging. Just try mtr ns-com.ui-dns.com to see
which locations and routers it passes inside AS8560. So for an accepoint
the nameing convention should at least identify the building and floor
where it is installed, for switches the exact rack and for routers the
exact datacenter.
"Just" using IATA 3 letter airport codes is not good enough in my
opinion because you usally have multiple datacenters/CoLos/PoPs around a
bigger airport like MCI or FRA
Cheers
Thomas
Am 11.02.25 um 18:13 schrieb Joel Sommers:
Hello all -
I am a researcher at Colgate University, working with colleagues at the
University of Wisconsin and Boston University on studying aspects of the
DNS.
We are wondering what insights anyone here may be willing to share about
naming convention patterns that we’ve observed. There are many FQDNs
with (full or partial) embedded IPv4 addresses in A records, with many
variations on padding, order, whether decimal or hex, etc. There are
also a number of providers that use some alphanumeric sequence
(seemingly unrelated to IP address) embedded in names. We assume that
these names are generated either from a commercial IPAM system or some
other set of management tools or scripts. Some of our questions are:
* What kinds of knobs are available in commercial IPAM systems for
crafting hostname patterns?
* What are some of the key use cases for having an A record (or AAAA
for that matter) in which part or all of the address is embedded in
the name?
Thanks so much for any thoughts you’re willing to share -- please feel
free to respond off-list.
Regards,
Joel Sommers
