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

Joe Abley jabley at hopcount.ca
Tue Jan 22 03:08:50 UTC 2013

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 fall-back-to-A-if-no-MX
>>> 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.


More information about the dns-operations mailing list