[dns-operations] about .in NS

[Peng Yonghua]

Hello,

I was confused about DNS authority for .in domain.

$ dig in ns +short|sort
a.root-servers.net.
b.root-servers.net.
c.root-servers.net.
d.root-servers.net.
e.root-servers.net.
f.root-servers.net.
g.root-servers.net.
h.root-servers.net.
i.root-servers.net.
j.root-servers.net.
k.root-servers.net.
l.root-servers.net.
m.root-servers.net.

it shows .in is auth-resolved by root-servers.

but when I run this:

$ dig rediff.in +trace

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> rediff.in +trace
;; global options: +cmd
.                       141101  IN      NS      d.root-servers.net.
.                       141101  IN      NS      l.root-servers.net.
.                       141101  IN      NS      m.root-servers.net.
.                       141101  IN      NS      b.root-servers.net.
.                       141101  IN      NS      g.root-servers.net.
.                       141101  IN      NS      k.root-servers.net.
.                       141101  IN      NS      c.root-servers.net.
.                       141101  IN      NS      e.root-servers.net.
.                       141101  IN      NS      f.root-servers.net.
.                       141101  IN      NS      a.root-servers.net.
.                       141101  IN      NS      j.root-servers.net.
.                       141101  IN      NS      h.root-servers.net.
.                       141101  IN      NS      i.root-servers.net.
;; Received 508 bytes from 180.76.76.76#53(180.76.76.76) in 14 ms

in.                     172800  IN      NS      a0.in.afilias-nst.info.
in.                     172800  IN      NS      a1.in.afilias-nst.in.
in.                     172800  IN      NS      a2.in.afilias-nst.info.
in.                     172800  IN      NS      b0.in.afilias-nst.org.
in.                     172800  IN      NS      b1.in.afilias-nst.in.
in.                     172800  IN      NS      b2.in.afilias-nst.org.
in.                     172800  IN      NS      c0.in.afilias-nst.info.
;; Received 506 bytes from 192.203.230.10#53(192.203.230.10) in 264 ms

rediff.in.              86400   IN      NS      ns.rediffmailpro.com.
rediff.in.              86400   IN      NS      ns2.rediffmailpro.com.
;; Received 79 bytes from 199.249.125.1#53(199.249.125.1) in 272 ms

rediff.in.              21600   IN      A       202.137.236.33
;; Received 43 bytes from 119.252.159.175#53(119.252.159.175) in 300 ms


It shows .in has been resolving by afilias-nst's name servers.
Can you help explain? thanks.