[dns-operations] potential future same-quad open resolvers - 25.25.25.25 and 25.26.27.28

[Viktor Dukhovni]

> On Nov 7, 2018, at 9:21 AM, Royce Williams <royce at techsolvency.com> wrote:
> 
> Back when Quad9 came out, on a whim I surveyed all same-quad IPs, and 3.3.3.3 seemed like a natural add.

Speaking of "same quad surveys", I am finding that various "same quad" addresses
are somewhat popular with folks who want to make up a fake MX host as a (largely
misguided IMHO) spam reduction measure, where they list a dead last (and more
rarely even first) MX host.

In the DNSSEC/DANE survey I see fake MX host counts as follows:

	209 	1.1.1.1
          3     2.2.2.2
          3     3.3.3.3
	  1     5.5.5.5
	  1     7.7.7.7
	 66     8.8.8.8
	  6     10.10.10.10
	  4     11.11.11.11
	  1     21.21.21.21
	  1     42.42.42.42
	  1     88.88.88.88
          1     99.99.99.99
	  1     64.64.64.64
          6     111.111.111.111
         13     123.123.123.123

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-- 
	Viktor.