Check that www.sjtu.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 sjtu.edu.cn soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 207
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			220226	IN	NS	g.root-servers.net.
.			220226	IN	NS	k.root-servers.net.
.			220226	IN	NS	d.root-servers.net.
.			220226	IN	NS	b.root-servers.net.
.			220226	IN	NS	a.root-servers.net.
.			220226	IN	NS	l.root-servers.net.
.			220226	IN	NS	f.root-servers.net.
.			220226	IN	NS	h.root-servers.net.
.			220226	IN	NS	c.root-servers.net.
.			220226	IN	NS	e.root-servers.net.
.			220226	IN	NS	m.root-servers.net.
.			220226	IN	NS	j.root-servers.net.
.			220226	IN	NS	i.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	89549	IN	A	198.41.0.4
a.root-servers.net.	89549	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	47813	IN	A	192.228.79.201
c.root-servers.net.	435597	IN	A	192.33.4.12
d.root-servers.net.	393946	IN	A	128.8.10.90
d.root-servers.net.	393946	IN	AAAA	2001:500:2d::d
e.root-servers.net.	45133	IN	A	192.203.230.10
f.root-servers.net.	90420	IN	A	192.5.5.241
f.root-servers.net.	395296	IN	AAAA	2001:500:2f::f
g.root-servers.net.	91084	IN	A	192.112.36.4
h.root-servers.net.	48122	IN	A	128.63.2.53
h.root-servers.net.	48122	IN	AAAA	2001:500:1::803f:235
i.root-servers.net.	89656	IN	A	192.36.148.17
i.root-servers.net.	89656	IN	AAAA	2001:7fe::53

;; Query time: 8 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue May 22 13:07:35 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 193
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 8

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

;; AUTHORITY SECTION:
cn.			172800	IN	NS	a.dns.cn.
cn.			172800	IN	NS	ns.cernet.net.
cn.			172800	IN	NS	c.dns.cn.
cn.			172800	IN	NS	d.dns.cn.
cn.			172800	IN	NS	b.dns.cn.
cn.			172800	IN	NS	e.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: 250 msec
;; SERVER: 2001:500:2d::d#53(d.root-servers.net)
;; WHEN: Tue May 22 13:07:35 2012
;; MSG SIZE  rcvd: 292

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 171
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 5, ADDITIONAL: 2

;; QUESTION SECTION:
;sjtu.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: 193 msec
;; SERVER: 2001:dc7:1000::1#53(d.dns.cn)
;; WHEN: Tue May 22 13:07:35 2012
;; MSG SIZE  rcvd: 177

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1944
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2

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

;; AUTHORITY SECTION:
sjtu.edu.cn.		172800	IN	NS	APPLE.sjtu.edu.cn.
sjtu.edu.cn.		172800	IN	NS	DNS.sjtu.edu.cn.

;; ADDITIONAL SECTION:
DNS.sjtu.edu.cn.	172800	IN	A	202.120.2.101
APPLE.sjtu.edu.cn.	172800	IN	A	202.120.2.100

;; Query time: 111 msec
;; SERVER: 137.189.6.21#53(ns2.cuhk.hk)
;; WHEN: Tue May 22 13:07:36 2012
;; MSG SIZE  rcvd: 99

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1068
;; flags: qr aa ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 6

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

;; ANSWER SECTION:
sjtu.edu.cn.		43200	IN	SOA	ns.sjtu.edu.cn. hostmaster.sjtu.edu.cn. 2012052101 10800 3600 60480 86400

;; AUTHORITY SECTION:
sjtu.edu.cn.		43200	IN	NS	ns.sjtu.edu.cn.
sjtu.edu.cn.		43200	IN	NS	dns.sjtu.edu.cn.
sjtu.edu.cn.		43200	IN	NS	apple.sjtu.edu.cn.

;; ADDITIONAL SECTION:
ns.sjtu.edu.cn.		43200	IN	A	202.120.2.89
ns.sjtu.edu.cn.		43200	IN	AAAA	2001:da8:8000:1:202:120:2:89
dns.sjtu.edu.cn.	43200	IN	A	202.120.2.101
dns.sjtu.edu.cn.	43200	IN	AAAA	2001:da8:8000:1:202:120:2:101
apple.sjtu.edu.cn.	43200	IN	A	202.120.2.100
apple.sjtu.edu.cn.	43200	IN	AAAA	2001:da8:8000:1:202:120:2:100

;; Query time: 224 msec
;; SERVER: 2001:da8:8000:1:202:120:2:101#53(DNS.sjtu.edu.cn)
;; WHEN: Tue May 22 13:07:36 2012
;; MSG SIZE  rcvd: 263

HTTP

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


; <<>> DiG 9.4.1-P1 <<>> www.sjtu.edu.cn aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 876
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

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

;; AUTHORITY SECTION:
sjtu.edu.cn.		10800	IN	SOA	ns.sjtu.edu.cn. hostmaster.sjtu.edu.cn. 2012052101 10800 3600 60480 86400

;; Query time: 20 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue May 22 13:07:37 2012
;; MSG SIZE  rcvd: 83

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

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

Reading ...

HTTP/1.1 200 OK
Date: Tue, 22 May 2012 03:37:38 GMT
Server: Apache/2.2.3 (CentOS)
X-Powered-By: PHP/5.1.6
Connection: close
Content-Type: text/html

Accessed / [2001:da8:8000:1:0:0:0:80] Response: HTTP/1.1 200 OK

SMTP

MX 5 mx.sjtu.edu.cn
Looking for AAAA on mx.sjtu.edu.cn

DNS

Looking for AAAA of NS DNS.sjtu.edu.cn
Querying 2001:da8:8000:1:202:120:2:101 for SOA of sjtu.edu.cn over IPv6 ... successful!
Looking for AAAA of NS ns.sjtu.edu.cn
Querying 2001:da8:8000:1:202:120:2:89 for SOA of sjtu.edu.cn over IPv6 ... successful!
Looking for AAAA of NS apple.sjtu.edu.cn
Querying 2001:da8:8000:1:202:120:2:100 for SOA of sjtu.edu.cn over IPv6 ... successful!

NTP

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

XMPP

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

Last Updated: Tue May 22 03:37:41 2012 UTC