About a month ago, I posted some stats on the usage of TXT records.
Here are some updates
There was a net increase of 2040 domains with SPF records, a 32.3%
increase in the last month. SPF records are now the most common type
of TXT record usage, surpassing the "unix epoch timestamp" that is
found in many zones.
The SPF adoption roll, despite being down much of this month, had a
net increase of 4776 records, a 33.7% increase. (The adoption roll,
like most SPF related things, is run by a volunteer.)
For Caller-ID records, the was a net increase of 5 records, a 6%
increase.
1289260 total domain names (same as last time)
35115 total TXT records found (some domains have more than one)
8360 have SPF records -> 23.8% of all domain level TXT records are
spf records.
26359 domains have txt records
6315 domains have spf records
18968 spf_domains adoption roll
87 have Caller-ID records
Last months stats as a reference:
In <x4wu35ml3v(_dot_)fsf(_at_)footbone(_dot_)midwestcs(_dot_)com> wayne
<wayne(_at_)midwestcs(_dot_)com> writes:
1289260 total domain names
33016 total TXT records found (some domains have more than one)
6320 have SPF records -> 19.1% of all domain level TXT records are
spf records
26359 domains have txt records
6315 domains have spf records
1456 domains found that were also in the adopt roll -> 23.0%
14192 spf_domains adoption roll
61554 estimated domains have SPF records. (This probably misses
most parked domains, of which I have heard rumors that there
are a least a couple hundred thousand with SPF records.
82 have Caller-ID records
57 have both Caller-ID records and SPF records
45 have "testing=true" in the C-ID records.
25 have C-ID records only, of which three (10%) are microsoft.com,
exchange.microsoft.com and hotmail.com