Check that www.vnuhcm.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 vnuhcm.edu.vn soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1873
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			130111	IN	NS	l.root-servers.net.
.			130111	IN	NS	h.root-servers.net.
.			130111	IN	NS	i.root-servers.net.
.			130111	IN	NS	g.root-servers.net.
.			130111	IN	NS	m.root-servers.net.
.			130111	IN	NS	b.root-servers.net.
.			130111	IN	NS	c.root-servers.net.
.			130111	IN	NS	j.root-servers.net.
.			130111	IN	NS	f.root-servers.net.
.			130111	IN	NS	a.root-servers.net.
.			130111	IN	NS	k.root-servers.net.
.			130111	IN	NS	d.root-servers.net.
.			130111	IN	NS	e.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	604237	IN	A	198.41.0.4
a.root-servers.net.	604237	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	476099	IN	A	192.228.79.201
c.root-servers.net.	345482	IN	A	192.33.4.12
d.root-servers.net.	303831	IN	A	128.8.10.90
d.root-servers.net.	303831	IN	AAAA	2001:500:2d::d
e.root-servers.net.	476099	IN	A	192.203.230.10
f.root-servers.net.	305	IN	A	192.5.5.241
f.root-servers.net.	305181	IN	AAAA	2001:500:2f::f
g.root-servers.net.	969	IN	A	192.112.36.4
h.root-servers.net.	562820	IN	A	128.63.2.53
h.root-servers.net.	562820	IN	AAAA	2001:500:1::803f:235
i.root-servers.net.	604345	IN	A	192.36.148.17
i.root-servers.net.	604345	IN	AAAA	2001:7fe::53

;; Query time: 10 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed May 23 14:09:30 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 403
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 7, ADDITIONAL: 9

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

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

;; 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: 35 msec
;; SERVER: 2001:7fe::53#53(i.root-servers.net)
;; WHEN: Wed May 23 14:09:30 2012
;; MSG SIZE  rcvd: 346

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 622
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 2

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

;; AUTHORITY SECTION:
vnuhcm.edu.vn.		43200	IN	NS	ns2.vdc2.vn.
vnuhcm.edu.vn.		43200	IN	NS	ns1.vdc2.vn.
vnuhcm.edu.vn.		43200	IN	NS	server.vnuhcm.edu.vn.
vnuhcm.edu.vn.		43200	IN	NS	vnuserv.vnuhcm.edu.vn.

;; ADDITIONAL SECTION:
server.vnuhcm.edu.vn.	43200	IN	A	203.162.44.33
vnuserv.vnuhcm.edu.vn.	43200	IN	A	203.162.44.34

;; Query time: 323 msec
;; SERVER: 2001:67c:e0::126#53(vn.cctld.authdns.ripe.net)
;; WHEN: Wed May 23 14:09:31 2012
;; MSG SIZE  rcvd: 147

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1711
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 2

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

;; ANSWER SECTION:
vnuhcm.edu.vn.		86400	IN	SOA	ns1.vdc2.vn. web.vdc2.vnn.vn. 2012041704 10800 3600 604800 10800

;; AUTHORITY SECTION:
vnuhcm.edu.vn.		86400	IN	NS	server.vnuhcm.edu.vn.
vnuhcm.edu.vn.		86400	IN	NS	vnuserv.vnuhcm.edu.vn.
vnuhcm.edu.vn.		86400	IN	NS	ns1.vdc2.vn.
vnuhcm.edu.vn.		86400	IN	NS	ns2.vdc2.vn.

;; ADDITIONAL SECTION:
server.vnuhcm.edu.vn.	86400	IN	A	203.162.44.34
vnuserv.vnuhcm.edu.vn.	86400	IN	A	203.162.44.33

;; Query time: 282 msec
;; SERVER: 203.162.96.80#53(ns1.vdc2.vn)
;; WHEN: Wed May 23 14:09:31 2012
;; MSG SIZE  rcvd: 196

HTTP

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


; <<>> DiG 9.4.1-P1 <<>> www.vnuhcm.edu.vn aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1598
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

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

;; AUTHORITY SECTION:
vnuhcm.edu.vn.		10800	IN	SOA	vnuserv.vnuhcm.edu.vn. postmaster.vnuserv.vnuhcm.edu.vn. 2010062801 10800 3600 604800 86400

;; Query time: 4 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed May 23 14:09:33 2012
;; MSG SIZE  rcvd: 90

Checking other options ... failed too.

SMTP

MX 10 aspmx.l.google.com
Looking for AAAA on ASPMX.L.GOOGLE.COM
MX 10 alt1.aspmx.l.google.com
Looking for AAAA on ALT1.ASPMX.L.GOOGLE.COM
MX 10 alt2.aspmx.l.google.com
Looking for AAAA on ALT2.ASPMX.L.GOOGLE.COM
MX 10 aspmx2.googlemail.com
Looking for AAAA on ASPMX2.GOOGLEMAIL.COM
MX 10 aspmx3.googlemail.com
Looking for AAAA on ASPMX3.GOOGLEMAIL.COM
MX 10 aspmx4.googlemail.com
Looking for AAAA on ASPMX4.GOOGLEMAIL.COM
MX 10 aspmx5.googlemail.com
Looking for AAAA on ASPMX5.GOOGLEMAIL.COM

DNS

Looking for AAAA of NS vnuserv.vnuhcm.edu.vn
No AAAA record for vnuserv.vnuhcm.edu.vn
Looking for AAAA of NS server.vnuhcm.edu.vn
No AAAA record for server.vnuhcm.edu.vn

NTP

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

XMPP

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

Last Updated: Wed May 23 04:39:37 2012 UTC