Comment by gwu78
9 years ago
The first of their three nameservers is non-responsive for at least some users. There is no round-robin.
ns-a.sdf.org 205.166.94.20
This will obviously slow down lookups for those users. If this is intentional, I would be curious why they are doing this.
There is the concept of a "hidden master", where the public nameservers are slaves to the real authoritative server, which is kept hidden. Some people put their hidden masters in their public NS records, which I've always found odd.