Note: these statistics have been re-checked against HE's Global IPv6 Deployment 
Progress Report and are current as of 2012-03-01.

(Originally posted on 2010-10-27.)

--

Spurred by a comment from Franck Martin on Hurricane Electric's Facebook page
[1], I recalled that someone had in fact done the legwork on which TLDs haven't 
made themselves IPv6-ready yet.  A quick Google ("tld ipv6") led me back to 
Martijn's IPv6 Blog [2] -- unfortunately the post I recalled was 14 months old.

Fortunately, Martijn was kind enough to outline his methodology and link his 
source material [3], so updating his data set was no trouble at all.  Thanks, 
Martijn!

So, taking from Hurricane Electric's report [4]:

Top Level Domains (TLDs): 312

TLDs without IPv6 nameservers: 44
Percentage of TLDs without IPv6 nameservers: 14.1%

ai ax bb bd bh bo cc ck cx dj fk fo gf gm hm iq jobs kp ky mh mil mp mq name ni
pf pk pro pw sl sr st td tg tl tv uz vi vu ws xn--lgbbat1ad8j xn--wgbh1c
xn--ygbi2ammx ye

TLDs with nameservers without IPv6 glue in the root zone: 56
Percentage of TLDs that do not have nameservers with IPv6 glue in the root 
zone: 17.9%

ai aw ax bb bd bf bh bj bn bo bs bv cc ck cm coop cx dj fk fo gf gm hm iq jobs
kp ky mh mil mp mq mv name ni pf pk pro pw sj sl sr st sv td tg tl tv uz vi vu
ws xn--lgbbat1ad8j xn--wgbh1c xn--ygbi2ammx ye zw

Thanks to Mr. Martin for inspiring me to regenerate the list.

--
References:

1. http://www.facebook.com/photo.php?fbid=447358231241&set=a.395837121241.176185.287045761241
2. http://ipv6blog.net/top-level-domains-that-still-do-not-support-ipv6/
3. http://data.iana.org/TLD/tlds-alpha-by-domain.txt
4. http://bgp.he.net/ipv6-progress-report.cgi
--
Changelog:

2012-03-01: Last month's numbers were off -- parsing error -- so here's the 
            corrected entry.
            Removed from list 1: .co, .dm, .gd, .gov, .nu, .qa, .tk, & 
            .xn--wgbl6a .  Added to list 1: .vi & .xn--lgbbat1ad8j !  For shame.
            Removed from list 2: .ba, .co, .dm, .er, .gd, .gov, .gp, .gu, .ir, 
            .mg, .mm, .mu, .nc, .ne, .nu, .pg, .pr, .qa, .sd, .sm, .sy, .tc, 
            .tk, .to, .tr, .tt, .vg, .xn--ogbpf8fl, & .xn--wgbl6a .  Added to 
            list 2 was .xn--lgbbat1ad8j -- booo.

2012-02-13: [ reacted due to errors ]

http://jima.tk/201103/ipv6-tld-hall-of-shame.txt
2011-03-30: Been a while!  There are 11 new TLDs, most of which have IPv6 
            nameservers.  No changes to list 1.  Removed from list 2 were
            .cr, .ec, .hr, .om, .sb; added was new TLD .xn--ogbpf8fl.

http://jima.tk/201101/ipv6-tld-hall-of-shame.txt
2011-01-17: Removed .gs from list 2 (~ 2011-01-11)

http://jima.tk/201012/ipv6-tld-hall-of-shame.txt
2010-12-27: Added new TLD .xn--wgbl6a (added to root yesterday or so)

http://jima.tk/201012/ipv6-tld-hall-of-shame.txt.20101203
2010-12-03: Removed .pa from both lists

http://jima.tk/201011/ipv6-tld-hall-of-shame.txt
2010-11-12: Removed .gov from list 1
            Removed .jo and .xn--mgbayh7gpa from list 2

http://jima.tk/201010/ipv6-tld-hall-of-shame.txt
2010-10-27: Initial version.