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 -35
nStill under discussion in the IETF
uFirst implementations have been tested
n
n
NXT opt-in Variant
a.com ns ns.a.com
a.com     NXT          SIG NS w.com
SIG NXT É.

b.com NS           ns.b.com
c.com      NS           ns.c.com

w.com      NS          ns.w.com
                 NXT        SIG NS z.com
                 SIG         NXT É.
z.com       NS          ns.z.com
                 NXT        SIG NS .com
                 SIG         NXT
Question for non-existent ba.com will return:

NXDOMAIN
Auth: A.COM  NXT    SIG NS w.com

One can not be sure ba.com does not exist.