Check that www.bupt.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 bupt.edu.cn soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1837
;; flags: qr ra; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; AUTHORITY SECTION:
.			3600000	IN	NS	D.ROOT-SERVERS.NET.
.			3600000	IN	NS	L.ROOT-SERVERS.NET.
.			3600000	IN	NS	F.ROOT-SERVERS.NET.
.			3600000	IN	NS	G.ROOT-SERVERS.NET.
.			3600000	IN	NS	M.ROOT-SERVERS.NET.
.			3600000	IN	NS	E.ROOT-SERVERS.NET.
.			3600000	IN	NS	H.ROOT-SERVERS.NET.
.			3600000	IN	NS	K.ROOT-SERVERS.NET.
.			3600000	IN	NS	C.ROOT-SERVERS.NET.
.			3600000	IN	NS	J.ROOT-SERVERS.NET.
.			3600000	IN	NS	A.ROOT-SERVERS.NET.
.			3600000	IN	NS	B.ROOT-SERVERS.NET.
.			3600000	IN	NS	I.ROOT-SERVERS.NET.

;; ADDITIONAL SECTION:
A.ROOT-SERVERS.NET.	438181	IN	A	198.41.0.4
A.ROOT-SERVERS.NET.	438181	IN	AAAA	2001:503:ba3e::2:30
B.ROOT-SERVERS.NET.	396445	IN	A	192.228.79.201
C.ROOT-SERVERS.NET.	138839	IN	A	192.33.4.12
D.ROOT-SERVERS.NET.	135393	IN	A	128.8.10.90
D.ROOT-SERVERS.NET.	135393	IN	AAAA	2001:500:2d::d
E.ROOT-SERVERS.NET.	393765	IN	A	192.203.230.10
F.ROOT-SERVERS.NET.	439052	IN	A	192.5.5.241
F.ROOT-SERVERS.NET.	134788	IN	AAAA	2001:500:2f::f
G.ROOT-SERVERS.NET.	439716	IN	A	192.112.36.4
H.ROOT-SERVERS.NET.	396754	IN	A	128.63.2.53
H.ROOT-SERVERS.NET.	396754	IN	AAAA	2001:500:1::803f:235
I.ROOT-SERVERS.NET.	438288	IN	A	192.36.148.17
I.ROOT-SERVERS.NET.	438288	IN	AAAA	2001:7fe::53

;; Query time: 7 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri May 18 12:17:03 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 123
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 8

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

;; AUTHORITY SECTION:
cn.			172800	IN	NS	c.dns.cn.
cn.			172800	IN	NS	d.dns.cn.
cn.			172800	IN	NS	ns.cernet.net.
cn.			172800	IN	NS	a.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
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: 134 msec
;; SERVER: 2001:503:ba3e::2:30#53(A.ROOT-SERVERS.NET)
;; WHEN: Fri May 18 12:17:03 2012
;; MSG SIZE  rcvd: 292

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1336
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 5, ADDITIONAL: 2

;; QUESTION SECTION:
;bupt.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: 149 msec
;; SERVER: 203.119.29.1#53(e.dns.cn)
;; WHEN: Fri May 18 12:17:03 2012
;; MSG SIZE  rcvd: 177

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 565
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2

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

;; AUTHORITY SECTION:
bupt.edu.cn.		172800	IN	NS	GUS.BUPTNET.edu.cn.
bupt.edu.cn.		172800	IN	NS	NS.BUPTNET.edu.cn.

;; ADDITIONAL SECTION:
NS.BUPTNET.edu.cn.	172800	IN	A	202.112.10.37
GUS.BUPTNET.edu.cn.	172800	IN	A	202.112.10.36

;; Query time: 111 msec
;; SERVER: 137.189.6.21#53(ns2.cuhk.hk)
;; WHEN: Fri May 18 12:17:03 2012
;; MSG SIZE  rcvd: 104

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 552
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

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

;; ANSWER SECTION:
bupt.edu.cn.		600	IN	SOA	ns.buptnet.edu.cn. hostmaster.bupt.edu.cn. 2012022506 10800 3600 604800 86400

;; AUTHORITY SECTION:
bupt.edu.cn.		600	IN	NS	ns.buptnet.edu.cn.
bupt.edu.cn.		600	IN	NS	gus.buptnet.edu.cn.

;; ADDITIONAL SECTION:
ns.buptnet.edu.cn.	172800	IN	A	202.112.10.37
gus.buptnet.edu.cn.	172800	IN	A	202.112.10.36

;; Query time: 150 msec
;; SERVER: 202.112.10.36#53(GUS.BUPTNET.edu.cn)
;; WHEN: Fri May 18 12:17:04 2012
;; MSG SIZE  rcvd: 151

HTTP

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

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

Reading ...

HTTP/1.1 200 OK
Date: Fri, 18 May 2012 02:44:48 GMT
Server: Apache/2.2.17 (Unix) PHP/5.3.5
X-Powered-By: PHP/5.3.5
Content-Type: text/html

Accessed / [2001:da8:215:4038:250:56ff:feb7:4f82] Response: HTTP/1.1 200 OK

SMTP

MX 5 mail.bupt.edu.cn
Looking for AAAA on mail.bupt.edu.cn

DNS

Looking for AAAA of NS gus.buptnet.edu.cn
No AAAA record for gus.buptnet.edu.cn
Looking for AAAA of NS ns.buptnet.edu.cn
No AAAA record for ns.buptnet.edu.cn

NTP

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

XMPP

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

Last Updated: Fri May 18 02:47:06 2012 UTC