Check that www.tsinghua.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 tsinghua.edu.cn soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1176
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			220029	IN	NS	l.root-servers.net.
.			220029	IN	NS	d.root-servers.net.
.			220029	IN	NS	h.root-servers.net.
.			220029	IN	NS	g.root-servers.net.
.			220029	IN	NS	e.root-servers.net.
.			220029	IN	NS	j.root-servers.net.
.			220029	IN	NS	m.root-servers.net.
.			220029	IN	NS	f.root-servers.net.
.			220029	IN	NS	c.root-servers.net.
.			220029	IN	NS	k.root-servers.net.
.			220029	IN	NS	a.root-servers.net.
.			220029	IN	NS	b.root-servers.net.
.			220029	IN	NS	i.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	89352	IN	A	198.41.0.4
a.root-servers.net.	89352	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	47616	IN	A	192.228.79.201
c.root-servers.net.	435400	IN	A	192.33.4.12
d.root-servers.net.	393749	IN	A	128.8.10.90
d.root-servers.net.	393749	IN	AAAA	2001:500:2d::d
e.root-servers.net.	44936	IN	A	192.203.230.10
f.root-servers.net.	90223	IN	A	192.5.5.241
f.root-servers.net.	395099	IN	AAAA	2001:500:2f::f
g.root-servers.net.	90887	IN	A	192.112.36.4
h.root-servers.net.	47925	IN	A	128.63.2.53
h.root-servers.net.	47925	IN	AAAA	2001:500:1::803f:235
i.root-servers.net.	89459	IN	A	192.36.148.17
i.root-servers.net.	89459	IN	AAAA	2001:7fe::53

;; Query time: 9 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue May 22 13:10:52 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 8

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

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

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

;; Query time: 43 msec
;; SERVER: 2001:500:2f::f#53(f.root-servers.net)
;; WHEN: Tue May 22 13:10:52 2012
;; MSG SIZE  rcvd: 296

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1675
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 5, ADDITIONAL: 2

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

;; AUTHORITY SECTION:
edu.cn.			172800	IN	NS	dns.edu.cn.
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.

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

;; Query time: 112 msec
;; SERVER: 203.119.27.1#53(c.dns.cn)
;; WHEN: Tue May 22 13:10:53 2012
;; MSG SIZE  rcvd: 181

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 394
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 3

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

;; AUTHORITY SECTION:
tsinghua.edu.cn.	172800	IN	NS	dns2.edu.cn.
tsinghua.edu.cn.	172800	IN	NS	ns2.cuhk.edu.hk.
tsinghua.edu.cn.	172800	IN	NS	dns2.tsinghua.edu.cn.
tsinghua.edu.cn.	172800	IN	NS	dns.tsinghua.edu.cn.

;; ADDITIONAL SECTION:
dns.tsinghua.edu.cn.	172800	IN	A	166.111.8.30
dns2.edu.cn.		172800	IN	A	202.112.0.13
dns2.tsinghua.edu.cn.	172800	IN	A	166.111.8.31

;; Query time: 161 msec
;; SERVER: 202.112.0.35#53(dns.edu.cn)
;; WHEN: Tue May 22 13:10:53 2012
;; MSG SIZE  rcvd: 166

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 612
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5

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

;; ANSWER SECTION:
tsinghua.edu.cn.	172800	IN	SOA	dns2.edu.cn. szhu.net.tsinghua.edu.cn. 2099123313 28800 7200 604800 86400

;; AUTHORITY SECTION:
tsinghua.edu.cn.	172800	IN	NS	ns2.cuhk.edu.hk.
tsinghua.edu.cn.	172800	IN	NS	dns.tsinghua.edu.cn.
tsinghua.edu.cn.	172800	IN	NS	dns2.edu.cn.
tsinghua.edu.cn.	172800	IN	NS	dns2.tsinghua.edu.cn.

;; ADDITIONAL SECTION:
dns.tsinghua.edu.cn.	172800	IN	A	166.111.8.30
ns2.cuhk.edu.hk.	172800	IN	A	137.189.6.21
ns2.cuhk.edu.hk.	172800	IN	AAAA	2405:3000:3:60::21
dns2.edu.cn.		172800	IN	A	202.112.0.13
dns2.tsinghua.edu.cn.	172800	IN	A	166.111.8.31

;; Query time: 111 msec
;; SERVER: 2405:3000:3:60::21#53(ns2.cuhk.edu.hk)
;; WHEN: Tue May 22 13:10:53 2012
;; MSG SIZE  rcvd: 255

HTTP

Looking for CNAME of www.tsinghua.edu.cn
Checking if there is a AAAA for www.tsinghua.edu.cn ... success.
Sending...

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

Reading ...

HTTP/1.1 200 OK
Server: TsinghuaWebServer/1.1.1.0
Date: Tue, 22 May 2012 03:40:54 GMT
Content-Type: text/html
Content-Length: 391
Last-Modified: Fri, 18 Mar 2011 07:42:33 GMT
Connection: keep-alive
Accept-Ranges: bytes

Accessed / [2402:f000:1:404:166:111:4:100] Response: HTTP/1.1 200 OK

SMTP

MX 10 mta0.tsinghua.edu.cn
Looking for AAAA on mta0.tsinghua.edu.cn
MX 10 mta1.tsinghua.edu.cn
Looking for AAAA on mta1.tsinghua.edu.cn

DNS

Looking for AAAA of NS dns2.edu.cn
No AAAA record for dns2.edu.cn
Looking for AAAA of NS dns.tsinghua.edu.cn
No AAAA record for dns.tsinghua.edu.cn
Looking for AAAA of NS ns2.cuhk.edu.hk
Querying 2405:3000:3:60:0:0:0:21 for SOA of tsinghua.edu.cn over IPv6 ... successful!
Looking for AAAA of NS dns2.tsinghua.edu.cn
No AAAA record for dns2.tsinghua.edu.cn

NTP

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

XMPP

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

Last Updated: Tue May 22 03:40:56 2012 UTC