> Has anybody ever done or seen a (recent) survey of how various RR types are
> distributed "in the wild" in real-world zones? Ideally, I'd be interested
Here's an excerpt of what was discovered during the latest RIPE DNS hostcount
<http://www.ripe.net/ripencc/pub-services/stats/hostcount/> for the TLD DE
<http://www.TechFak.Uni-Bielefeld.DE/~pk/dns/hostcount/latest.html>.
38506954 total
13173185 A
11301138 NS
7970557 MX
4916802 SOA
829975 CNAME
202454 HINFO
90459 TXT
9544 PTR
4101 SRV
2465 WKS
2456 RP
1105 AAAA
1037 MB
943 MR
621 LOC
50 A6
23 KEY
18 MINFO
17 AFSDB
2 NSAP
2 MG
The figures for A, NS and SOA are off by a factor of two (see ref'd document
for an explanation). Some observations:
o HINFO is rather popular
o PTR RRs are due to RFC1101 and classless delegation (RFC2317) pointing
into the "forward" zone
o SRV is still rather low, but the survey only covers some 80 % (== 2.45
million) of the zones and only sees the externally visible part of the
namespace
o Given the distribution of AAAA and A6 - does this call for combined
operations?
Finally, the question whether a certain RR type is "used" remains unanswered
for most of them, because you'd have to take into account both zone population
and query patterns.
-Peter
