Level3/GTEI well-known DNS down?

["randal k" <nanog () data102 com>]

Anybody know what is up/down with the GTE/Level3 name-servers used the world
over on 4.2.2.1, 4.2.2.2? Suddenly started getting no responses from them
for a couple of our side apps.

I hope these servers stick around forever, they're kind of an Internet
legend.

Cheers,
Randal