ietf-mxcomp
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by the numbers

2004-09-14 09:06:57


On Sep 13, 2004, at 11:28 PM, wayne wrote:

Can you give me a pointer to this survey that you are referring to?
Can you explain the differences between the 2% you quote and the 36% I
found?

Attached you will find a survey that Marcos Sanz and I did of com, net, and de. We did look at every domain but we did sample a statistically significant number of them.

I'll reserve my conclusions for now, save the fact that your numbers depend on where you look.

-andy

                                                com/net           de
MX Reocrds 7,617,555 1,164,17 MX Records With Address In Target 63,797 521 MX Records With Unresolvable Targets 358,369 13,324 MX Records Pointing To Loopback Address 125,956 949 MX Records At Zone Apex 6,949,466 1,119,31 Wildcard MX Record 668,089 44,861

Unique MX Record by IP Address 2,264,858 196,545

TXT Records 407,961 17,850 Wildcard TXT Record 25,669 187 TXT Records at Zone Apex 356,537 17,474 CNAME'd TXT Records at Zone Apex 248 4 TXT with SPF Content 185,607 2,304 TXT with Caller-ID Content 137 2 TXT with _ep Prefix 25,755 189 TXT with _ep Prefix and No Caller-ID Content 25,624 187 TXT with _ep Prefix and Caller-ID Content 131 2 TXT with _ep Prefix and SPF Content 24,368 156 Wildcard TXT with SPF Content 24,378 156 Wildcard TXT with Caller-ID Content 0 0 TXT at Zone Apex with SPF Content 136,861 1,992 TXT at Zone Apex with Caller-ID Content 6 0

Average Size of All TXT Records 39 21 Avearge Size of All Wildcard TXT Records 12 27 Average Size of All Apex TXT Recrods 43 21 Average Size of All SPF Records 56 27 Average Size of All Caller-ID Records 82 76 Largest TXT Record 423 232 Largest SPF Record 386 232 Largest Caller-ID Record 249 96

Total Number of Domains Scanned 8,477,489 736,725 Domains with A Record at Zone Apex 5,574,982 503,652 Domains with A Record at Apex Pointing to Loopba 867 269 Domains with AAAA Record at Zone Apex 2,284 58 Domains with Address in MX Record 62,513 499 Domains with Unresolvable MX Target 226,673 12,497 Domains with MX Pointing to Loopback Address 86,344 915 Domains with MX Record at Zone Apex 4,697,344 676,517 Domains with TXT Record at Zone Apex 329,707 15,071 Domains with Wildcard MX Record 437,982 26,616 Domains with Wildcard TXT Record 25,619 186 Domains with Apex MX and Wildcard MX 418,547 26,443 Domains with Apex TXT and Wildcard TXT 24,531 181 Domains with SPF 138,603 1,993 Domains with Caller-ID 136 2 Domains with both SPF and Caller-ID 107 1 Domains with SPF and Wildcard TXT 24,378 156 Domains with SPF in Wildcard TXT 24,378 156 Domains with SPF and Wildcard TXT but not Both 0 0 Domains with SPF and Other Content in Wildcard T 4 0 Domains with SPF at Zone Apex 136,853 1,991 Domains with SPF '+all' 7 0 Domains with SPF '-all' 76,386 571 Domains with SPF '?all' 51,005 105 Domains with SPF '~all' 10,351 96 Domains with Caller-ID and Wildcard TXT 26 0 Domains with Caller-ID in Wildcard TXT 0 0 Domains with Caller-ID and Wildcard TXT but not 26 0 Domains with Caller-ID and Other Content in Wild 0 0 Domains with a valid A or MX at the Apex 6,104,870 693,109 Domains with a valid A or MX at the Apex and SPF 130,464 1,926 Domains with a valid A or MX at the Apex and Cal 121 2

Average Size of Wildcard TXT for Domains with Wi 12 27 Average Size of Apex TXT for Domains with Apex T 43 20

Total Number of Domains In Zone(s) 33,887,010 5,896,72 Total Number of Domains Processed 8,477,489 736,725


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