glue record

[Anton Zimm <anton.zimm () gmail com>]

Hi,
I'm looking for glue record for ns1.push.mobi so I ask one of the root
name server.
It gives me the list of dot mobi authorized name servers.

I'm expecting it to be answered by one of the mobi tld authorized name
servers, but it's telling me that it delegates the answer to
ns1.push.mobi instead. It does not make sense for me because how can I
ask ns1.push.mobi if I don't know its ip address yet...
Clue please..?

-----
az@hollywood:~$ dig @B2.MOBI.AFILIAS-NST.ORG. ns1.push.mobi
....

;; QUESTION SECTION:
;ns1.push.mobi.                 IN      A

;; AUTHORITY SECTION:
push.mobi.              86400   IN      NS      ns1.push.mobi.
push.mobi.              86400   IN      NS      ns2.push.mobi.

;; ADDITIONAL SECTION:
ns1.push.mobi.          86400   IN      A       117.102.248.2
ns2.push.mobi.          86400   IN      A       117.102.248.3
-----

best,
Anton.