17 Sep
2014
17 Sep
'14
4:46 p.m.
The latter would seem to be avoidable by making sure that *DNS resolution of bare TLDs always returns NXDOMAIN*.
Is that a requirement for a TLD?
No. In fact, a TLD lookup that returned NXDOMAIN would be utterly broken since that would mean the TLD had no SOA, no NS, and no subdomains. Perhaps you're confusing it with NOERROR.
If it isn't, does anyone know of any domains dumb enough to actual return something for a lookup on the bare TLD?
Yes. If you'd read RFC 7085, you'd already know which ones do. There have been A and MX records at TLDs nearly as long as there have been TLDs. R's, John