I do confirm that NS21.DOMAINCONTROL.COM and NS22.DOMAINCONTROL.COM are also unreacheable from ISP Free.fr in France.
Like pQd traceroute, mine also end after 208.109.115.201 for both ns21 and ns22.
traceroute to NS22.DOMAINCONTROL.COM (208.109.255.11), 64 hops max, 40 byte packets
1 x.x.x.x (x.x.x.x) 2.526 ms 0.799 ms 0.798 ms
2 78.224.126.254 (78.224.126.254) 6.313 ms 6.063 ms 6.589 ms
3 213.228.5.254 (213.228.5.254) 6.099 ms 6.776 ms *
4 212.27.50.170 (212.27.50.170) 6.943 ms 6.866 ms 6.842 ms
5 212.27.50.190 (212.27.50.190) 8.308 ms 6.641 ms 6.866 ms
6 212.27.38.226 (212.27.38.226) 68.660 ms 185.527 ms 14.123 ms
7 204.245.39.50 (204.245.39.50) 48.544 ms 19.391 ms 19.753 ms
8 208.109.115.201 (208.109.115.201) 19.315 ms 19.668 ms 34.110 ms
9 * * *
10 * * *
11 * * *
12 * * *
But ns52.domaincontrol.com (208.109.255.26) do works and is in the same subnet as ns22.domaincontrol.com (208.109.255.11)
traceroute to ns52.domaincontrol.com (208.109.255.26), 64 hops max, 40 byte packets
1 x.x.x.x (x.x.x.x) 1.229 ms 0.816 ms 0.808 ms
2 78.224.126.254 (78.224.126.254) 12.127 ms 5.623 ms 6.068 ms
3 * * *
4 212.27.50.170 (212.27.50.170) 13.824 ms 6.683 ms 6.828 ms
5 212.27.50.190 (212.27.50.190) 6.962 ms * 7.085 ms
6 212.27.38.226 (212.27.38.226) 35.379 ms 7.105 ms 7.830 ms
7 204.245.39.50 (204.245.39.50) 19.896 ms 19.426 ms 19.355 ms
8 208.109.115.121 (208.109.115.121) 37.931 ms 19.665 ms 19.814 ms
9 208.109.115.162 (208.109.115.162) 19.663 ms 19.395 ms 29.670 ms
10 208.109.113.62 (208.109.113.62) 19.398 ms 19.220 ms 19.158 ms
11 * * *
12 * * *
13 * * *
As you can see, this time after 204.245.39.50 we go to 208.109.115.121 instead of 208.109.115.201. And pQd has the same traceroute. From a working place I did not cross this 204.245.39.50 router (Global Crossing).
More traceroute from working and non working place would help, but it's highly probable that Global Crossing has a bogus routing entry for 208.109.255.11/32 and 216.69.185.11/32 as 208.109.255.10, 208.109.255.12, 216.69.185.10, 216.69.185.12 are working well.
Why it has a boged routing entry is hard to know. Probably 208.109.115.201 (Go Daddy) is advertising a non working route for 208.109.255.11/32 and 216.69.185.11/32.
EDIT: You can telnet route-server.eu.gblx.net to connect to the Global Crossing route server and do traceroute from within Global Crossing network
EDIT: It seems that the same problem already occured with others NS few days ago, see: http://www.newtondynamics.com/forum/viewtopic.php?f=9&t=5277&start=0
