[dns-operations] Monday rant againt the uses of the Public Suffix List

Franck Martin fmartin at linkedin.com
Mon Jan 28 09:31:29 UTC 2013

On 1/21/13 7:08 PM, "Joe Abley" <jabley at hopcount.ca> wrote:

>On 2013-01-22, at 11:14, Vernon Schryver <vjs at rhyolite.com> wrote:
>>>>> Continuing the sarcasm is too much effort, so I'll simply ask why not
>>>>> do DNS MX and A requests?  (both because of the
>>>> Please sir, if I run www.images.example.co.uk, can I set a cookie
>>>> at images.example.co.uk? How about example.co.uk? Fine Now .co.uk?
>> It might also be worth noting that co.uk as well as com, org and
>> the few other TLDs that I tried just now lack A, AAAA, and MX RRs,
>> so a browser could use a DNS test to reject some supercookies.
>I'm not sure it'd be a very good general test, though. For example,
>[krill:~]% dig dk. A +short
>[krill:~]% dig co.za MX +short
>10 mx2.coza.net.za.

$ dig +short mx ws.
10 mail.worldsite.ws.

There are plenty errors in the public suffix list for Pacific Island
countries. I guess the operators of the ccTLDs there, never heard of the

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