Check that www.vnu.edu.vn exists for IPv4 in case we have a typo on the domain name. Use dig to query the local name server (::1).


; <<>> DiG 9.4.1-P1 <<>> +trace +all vnu.edu.vn soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 635
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			130115	IN	NS	l.root-servers.net.
.			130115	IN	NS	g.root-servers.net.
.			130115	IN	NS	m.root-servers.net.
.			130115	IN	NS	i.root-servers.net.
.			130115	IN	NS	k.root-servers.net.
.			130115	IN	NS	j.root-servers.net.
.			130115	IN	NS	d.root-servers.net.
.			130115	IN	NS	h.root-servers.net.
.			130115	IN	NS	e.root-servers.net.
.			130115	IN	NS	f.root-servers.net.
.			130115	IN	NS	a.root-servers.net.
.			130115	IN	NS	b.root-servers.net.
.			130115	IN	NS	c.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	604241	IN	A	198.41.0.4
a.root-servers.net.	604241	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	476103	IN	A	192.228.79.201
c.root-servers.net.	345486	IN	A	192.33.4.12
d.root-servers.net.	303835	IN	A	128.8.10.90
d.root-servers.net.	303835	IN	AAAA	2001:500:2d::d
e.root-servers.net.	476103	IN	A	192.203.230.10
f.root-servers.net.	309	IN	A	192.5.5.241
f.root-servers.net.	305185	IN	AAAA	2001:500:2f::f
g.root-servers.net.	973	IN	A	192.112.36.4
h.root-servers.net.	562824	IN	A	128.63.2.53
h.root-servers.net.	562824	IN	AAAA	2001:500:1::803f:235
i.root-servers.net.	604349	IN	A	192.36.148.17
i.root-servers.net.	604349	IN	AAAA	2001:7fe::53

;; Query time: 7 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed May 23 14:09:26 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1757
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 7, ADDITIONAL: 9

;; QUESTION SECTION:
;vnu.edu.vn.			IN	SOA

;; AUTHORITY SECTION:
vn.			172800	IN	NS	b.dns-servers.vn.
vn.			172800	IN	NS	vn.cctld.authdns.ripe.net.
vn.			172800	IN	NS	d.dns-servers.vn.
vn.			172800	IN	NS	c.dns-servers.vn.
vn.			172800	IN	NS	f.dns-servers.vn.
vn.			172800	IN	NS	e.dns-servers.vn.
vn.			172800	IN	NS	a.dns-servers.vn.

;; ADDITIONAL SECTION:
a.dns-servers.vn.	172800	IN	A	194.0.1.18
a.dns-servers.vn.	172800	IN	AAAA	2001:678:4::12
b.dns-servers.vn.	172800	IN	A	203.119.10.105
c.dns-servers.vn.	172800	IN	A	203.119.38.105
d.dns-servers.vn.	172800	IN	A	203.119.44.105
e.dns-servers.vn.	172800	IN	A	203.119.60.105
f.dns-servers.vn.	172800	IN	A	203.119.68.105
vn.cctld.authdns.ripe.net. 172800 IN	A	193.0.9.126
vn.cctld.authdns.ripe.net. 172800 IN	AAAA	2001:67c:e0::126

;; Query time: 134 msec
;; SERVER: 2001:503:c27::2:30#53(j.root-servers.net)
;; WHEN: Wed May 23 14:09:26 2012
;; MSG SIZE  rcvd: 343

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 370
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;vnu.edu.vn.			IN	SOA

;; AUTHORITY SECTION:
vnu.edu.vn.		43200	IN	NS	dns.vnu.edu.vn.

;; ADDITIONAL SECTION:
dns.vnu.edu.vn.		43200	IN	A	203.113.130.221

;; Query time: 158 msec
;; SERVER: 203.119.60.105#53(e.dns-servers.vn)
;; WHEN: Wed May 23 14:09:26 2012
;; MSG SIZE  rcvd: 62

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1429
;; flags: qr aa ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;vnu.edu.vn.			IN	SOA

;; ANSWER SECTION:
vnu.edu.vn.		21600	IN	SOA	dns.vnu.edu.vn. hostmaster.vnu.edu.vn. 2011090802 3600 900 1209600 3600

;; AUTHORITY SECTION:
vnu.edu.vn.		21600	IN	NS	dns.vnu.edu.vn.

;; ADDITIONAL SECTION:
dns.vnu.edu.vn.		21600	IN	A	203.113.130.221

;; Query time: 157 msec
;; SERVER: 203.113.130.221#53(dns.vnu.edu.vn)
;; WHEN: Wed May 23 14:09:27 2012
;; MSG SIZE  rcvd: 109

HTTP

Looking for CNAME of www.vnu.edu.vn
Checking if there is a AAAA for www.vnu.edu.vn ... FAILED.


; <<>> DiG 9.4.1-P1 <<>> www.vnu.edu.vn aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1355
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;www.vnu.edu.vn.			IN	AAAA

;; AUTHORITY SECTION:
vnu.edu.vn.		3599	IN	SOA	dns.vnu.edu.vn. hostmaster.vnu.edu.vn. 2011090802 3600 900 1209600 3600

;; Query time: 4 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed May 23 14:09:28 2012
;; MSG SIZE  rcvd: 83

Checking other options ... failed too.

SMTP

MX 1 gateway.mail.vnu.edu.vn
Looking for AAAA on gateway.mail.vnu.edu.vn

DNS

Looking for AAAA of NS dns.vnu.edu.vn
No AAAA record for dns.vnu.edu.vn

NTP

Looking for an A record for ntp.vnu.edu.vn
Looking for an A record for clock.vnu.edu.vn
Looking for an A record for time.vnu.edu.vn
Looking for an A record for chime.vnu.edu.vn

XMPP

Looking for a SRV record for _xmpp-client._tcp.vnu.edu.vn
Looking for a SRV record for _xmpp-server._tcp.vnu.edu.vn

Last Updated: Wed May 23 04:39:30 2012 UTC