Check that www.bjtu.edu.cn 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 bjtu.edu.cn soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1311
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			34650	IN	NS	l.root-servers.net.
.			34650	IN	NS	d.root-servers.net.
.			34650	IN	NS	i.root-servers.net.
.			34650	IN	NS	g.root-servers.net.
.			34650	IN	NS	f.root-servers.net.
.			34650	IN	NS	m.root-servers.net.
.			34650	IN	NS	c.root-servers.net.
.			34650	IN	NS	h.root-servers.net.
.			34650	IN	NS	b.root-servers.net.
.			34650	IN	NS	j.root-servers.net.
.			34650	IN	NS	k.root-servers.net.
.			34650	IN	NS	e.root-servers.net.
.			34650	IN	NS	a.root-servers.net.

;; ADDITIONAL SECTION:
k.root-servers.net.	524168	IN	A	193.0.14.129
k.root-servers.net.	524168	IN	AAAA	2001:7fd::1
a.root-servers.net.	522642	IN	A	198.41.0.4
a.root-servers.net.	522642	IN	AAAA	2001:503:ba3e::2:30
c.root-servers.net.	223300	IN	A	192.33.4.12
d.root-servers.net.	219854	IN	A	128.8.10.90
d.root-servers.net.	219854	IN	AAAA	2001:500:2d::d
j.root-servers.net.	134912	IN	A	192.58.128.30
j.root-servers.net.	134912	IN	AAAA	2001:503:c27::2:30
b.root-servers.net.	480906	IN	A	192.228.79.201
e.root-servers.net.	478226	IN	A	192.203.230.10
i.root-servers.net.	522749	IN	A	192.36.148.17
i.root-servers.net.	522749	IN	AAAA	2001:7fe::53
f.root-servers.net.	523513	IN	A	192.5.5.241

;; Query time: 8 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu May 17 12:49:22 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1366
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 8

;; QUESTION SECTION:
;bjtu.edu.cn.			IN	SOA

;; AUTHORITY SECTION:
cn.			172800	IN	NS	e.dns.cn.
cn.			172800	IN	NS	a.dns.cn.
cn.			172800	IN	NS	b.dns.cn.
cn.			172800	IN	NS	d.dns.cn.
cn.			172800	IN	NS	c.dns.cn.
cn.			172800	IN	NS	ns.cernet.net.

;; ADDITIONAL SECTION:
a.dns.cn.		172800	IN	A	203.119.25.1
a.dns.cn.		172800	IN	AAAA	2001:dc7::1
b.dns.cn.		172800	IN	A	203.119.26.1
c.dns.cn.		172800	IN	A	203.119.27.1
d.dns.cn.		172800	IN	A	203.119.28.1
d.dns.cn.		172800	IN	AAAA	2001:dc7:1000::1
e.dns.cn.		172800	IN	A	203.119.29.1
ns.cernet.net.		172800	IN	A	202.112.0.44

;; Query time: 185 msec
;; SERVER: 192.33.4.12#53(c.root-servers.net)
;; WHEN: Thu May 17 12:49:22 2012
;; MSG SIZE  rcvd: 292

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1333
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 5, ADDITIONAL: 2

;; QUESTION SECTION:
;bjtu.edu.cn.			IN	SOA

;; AUTHORITY SECTION:
edu.cn.			172800	IN	NS	ns2.cuhk.hk.
edu.cn.			172800	IN	NS	ns2.cernet.net.
edu.cn.			172800	IN	NS	dns2.edu.cn.
edu.cn.			172800	IN	NS	deneb.dfn.de.
edu.cn.			172800	IN	NS	dns.edu.cn.

;; ADDITIONAL SECTION:
dns.edu.cn.		172800	IN	A	202.112.0.35
dns2.edu.cn.		172800	IN	A	202.112.0.13

;; Query time: 111 msec
;; SERVER: 203.119.27.1#53(c.dns.cn)
;; WHEN: Thu May 17 12:49:23 2012
;; MSG SIZE  rcvd: 177

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1754
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;bjtu.edu.cn.			IN	SOA

;; AUTHORITY SECTION:
bjtu.edu.cn.		172800	IN	NS	JUPITER.NJTU.edu.cn.
bjtu.edu.cn.		172800	IN	NS	MARS.NJTU.edu.cn.

;; ADDITIONAL SECTION:
MARS.NJTU.edu.cn.	172800	IN	A	202.112.144.30
JUPITER.NJTU.edu.cn.	172800	IN	A	202.112.144.65

;; Query time: 158 msec
;; SERVER: 202.112.0.13#53(dns2.edu.cn)
;; WHEN: Thu May 17 12:49:23 2012
;; MSG SIZE  rcvd: 107

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1619
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;bjtu.edu.cn.			IN	SOA

;; ANSWER SECTION:
bjtu.edu.cn.		10800	IN	SOA	mars.njtu.edu.cn. gaobo.gaobo.net. 2012051601 86400 7200 2419200 3600

;; AUTHORITY SECTION:
bjtu.edu.cn.		10800	IN	NS	mars.bjtu.edu.cn.
bjtu.edu.cn.		10800	IN	NS	jupiter.bjtu.edu.cn.

;; ADDITIONAL SECTION:
mars.bjtu.edu.cn.	10800	IN	A	202.112.144.30
jupiter.bjtu.edu.cn.	10800	IN	A	202.112.144.65

;; Query time: 175 msec
;; SERVER: 202.112.144.30#53(MARS.NJTU.edu.cn)
;; WHEN: Thu May 17 12:49:24 2012
;; MSG SIZE  rcvd: 163

HTTP

Looking for CNAME of www.bjtu.edu.cn
Checking if there is a AAAA for www.bjtu.edu.cn ... FAILED.


; <<>> DiG 9.4.1-P1 <<>> www.bjtu.edu.cn aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 834
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;www.bjtu.edu.cn.		IN	AAAA

;; AUTHORITY SECTION:
bjtu.edu.cn.		3600	IN	SOA	mars.njtu.edu.cn. gaobo.gaobo.net. 2012051601 86400 7200 2419200 3600

;; Query time: 6 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu May 17 12:49:25 2012
;; MSG SIZE  rcvd: 94

Checking other options ... succeeded as ipv6.bjtu.edu.cn.
Sending...

HEAD / HTTP/1.1
Host: ipv6.bjtu.edu.cn
User-Agent: ipv6-survey.pl/1.97 http://www.mrp.net/IPv6_Survey.html

Reading ...

HTTP/1.1 200 OK
Content-Length: 3667
Content-Type: text/html
Content-Location: http://ipv6.bjtu.edu.cn/index.html
Last-Modified: Wed, 09 Dec 2009 00:56:20 GMT
Accept-Ranges: bytes
ETag: "32f6d56b6a78ca1:af8"
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
Date: Thu, 17 May 2012 03:19:14 GMT

Accessed / [2001:da8:205:0:0:0:0:10] Response: HTTP/1.1 200 OK

SMTP

MX 10 smg.bjtu.edu.cn
Looking for AAAA on smg.bjtu.edu.cn

DNS

Looking for AAAA of NS mars.bjtu.edu.cn
No AAAA record for mars.bjtu.edu.cn
Looking for AAAA of NS jupiter.bjtu.edu.cn
No AAAA record for jupiter.bjtu.edu.cn

NTP

Looking for an A record for ntp.bjtu.edu.cn
Looking for an A record for clock.bjtu.edu.cn
Looking for an A record for time.bjtu.edu.cn
Found an A or AAAA record. Now looking for a AAAA.
Cannot find a AAAA record for time.bjtu.edu.cn
Cannot find a AAAA record for time.ipv6.bjtu.edu.cn

XMPP

Looking for a SRV record for _xmpp-client._tcp.bjtu.edu.cn
Looking for a SRV record for _xmpp-server._tcp.bjtu.edu.cn

Last Updated: Thu May 17 03:19:28 2012 UTC