Check that www.zju.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 zju.edu.cn soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 788
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			130104	IN	NS	i.root-servers.net.
.			130104	IN	NS	b.root-servers.net.
.			130104	IN	NS	h.root-servers.net.
.			130104	IN	NS	c.root-servers.net.
.			130104	IN	NS	a.root-servers.net.
.			130104	IN	NS	g.root-servers.net.
.			130104	IN	NS	l.root-servers.net.
.			130104	IN	NS	f.root-servers.net.
.			130104	IN	NS	j.root-servers.net.
.			130104	IN	NS	m.root-servers.net.
.			130104	IN	NS	d.root-servers.net.
.			130104	IN	NS	e.root-servers.net.
.			130104	IN	NS	k.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	604230	IN	A	198.41.0.4
a.root-servers.net.	604230	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	476092	IN	A	192.228.79.201
c.root-servers.net.	345475	IN	A	192.33.4.12
d.root-servers.net.	303824	IN	A	128.8.10.90
d.root-servers.net.	303824	IN	AAAA	2001:500:2d::d
e.root-servers.net.	476092	IN	A	192.203.230.10
f.root-servers.net.	298	IN	A	192.5.5.241
f.root-servers.net.	305174	IN	AAAA	2001:500:2f::f
g.root-servers.net.	962	IN	A	192.112.36.4
h.root-servers.net.	562813	IN	A	128.63.2.53
h.root-servers.net.	562813	IN	AAAA	2001:500:1::803f:235
i.root-servers.net.	604338	IN	A	192.36.148.17
i.root-servers.net.	604338	IN	AAAA	2001:7fe::53

;; Query time: 8 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed May 23 14:09:37 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 908
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 8

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

;; AUTHORITY SECTION:
cn.			172800	IN	NS	c.dns.cn.
cn.			172800	IN	NS	a.dns.cn.
cn.			172800	IN	NS	e.dns.cn.
cn.			172800	IN	NS	ns.cernet.net.
cn.			172800	IN	NS	d.dns.cn.
cn.			172800	IN	NS	b.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: 249 msec
;; SERVER: 2001:500:2d::d#53(d.root-servers.net)
;; WHEN: Wed May 23 14:09:37 2012
;; MSG SIZE  rcvd: 291

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 360
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 5, ADDITIONAL: 2

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

;; AUTHORITY SECTION:
edu.cn.			172800	IN	NS	deneb.dfn.de.
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.

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

;; Query time: 194 msec
;; SERVER: 2001:dc7::1#53(a.dns.cn)
;; WHEN: Wed May 23 14:09:37 2012
;; MSG SIZE  rcvd: 176

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1128
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2

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

;; AUTHORITY SECTION:
zju.edu.cn.		172800	IN	NS	ALPHA.zju.edu.cn.
zju.edu.cn.		172800	IN	NS	LDNS.zju.edu.cn.

;; ADDITIONAL SECTION:
LDNS.zju.edu.cn.	172800	IN	A	210.32.0.8
ALPHA.zju.edu.cn.	172800	IN	A	210.32.0.7

;; Query time: 339 msec
;; SERVER: 192.76.176.9#53(deneb.dfn.de)
;; WHEN: Wed May 23 14:09:38 2012
;; MSG SIZE  rcvd: 99

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1122
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

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

;; ANSWER SECTION:
zju.edu.cn.		3600	IN	SOA	alpha.zju.edu.cn. root.zju.edu.cn. 2012108808 7200 3600 604800 3600

;; AUTHORITY SECTION:
zju.edu.cn.		3600	IN	NS	alpha.zju.edu.cn.

;; ADDITIONAL SECTION:
alpha.zju.edu.cn.	3600	IN	A	210.32.0.8

;; Query time: 254 msec
;; SERVER: 210.32.0.8#53(LDNS.zju.edu.cn)
;; WHEN: Wed May 23 14:09:39 2012
;; MSG SIZE  rcvd: 105

HTTP

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


; <<>> DiG 9.4.1-P1 <<>> www.zju.edu.cn aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 554
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

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

;; Query time: 5863 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed May 23 14:11:20 2012
;; MSG SIZE  rcvd: 32

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

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

Reading ...

HTTP/1.1 200 OK
Date: Wed, 23 May 2012 04:45:27 GMT
Server: Apache
X-Powered-By: PHP/5.1.2
Set-Cookie: PHPSESSID=d486kcg8bbas7n14jaj9fmraf3; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Type: text/html

Accessed / [2001:da8:e000:92:0:0:0:29] Response: HTTP/1.1 200 OK

SMTP

MX 10 spam.zju.edu.cn
Looking for AAAA on spam.zju.edu.cn

DNS

Looking for AAAA of NS alpha.zju.edu.cn
No AAAA record for alpha.zju.edu.cn

NTP

Looking for an A record for ntp.zju.edu.cn
Looking for an A record for clock.zju.edu.cn
Looking for an A record for time.zju.edu.cn
Looking for an A record for chime.zju.edu.cn

XMPP

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

Last Updated: Wed May 23 04:41:24 2012 UTC