Those are qname minimization queries.
Because DNS implementations (especially in load-balancers) are so broken, the
qname minimizing resolver can’t ask for:
IN NS
because that often doesn’t work, but when it asks:
_. IN A
the resolver will get the correct answer.
Unfortunately, this is the
On 4/9/21, John W. Blue via bind-users wrote:
> It would seem that underscores is one of those characters in DNS that leads
> a double life.
>
> RFC’s say that underscores are disallowed for use in hostnames
Right. But it's **hostnames** and not everyone enforces that rule :(
> but SRV
>
It would seem that underscores is one of those characters in DNS that leads a
double life.
RFC’s say that underscores are disallowed for use in hostnames but SRV records
use it to indicate service type et al. And then you have the
acm-validations.aws geniuses who use it their hostnames to
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