Check that www.buptnet.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 buptnet.edu.cn soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 469
;; flags: qr ra; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

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

;; ADDITIONAL SECTION:
A.ROOT-SERVERS.NET.	438185	IN	A	198.41.0.4
A.ROOT-SERVERS.NET.	438185	IN	AAAA	2001:503:ba3e::2:30
B.ROOT-SERVERS.NET.	396449	IN	A	192.228.79.201
C.ROOT-SERVERS.NET.	138843	IN	A	192.33.4.12
D.ROOT-SERVERS.NET.	135397	IN	A	128.8.10.90
D.ROOT-SERVERS.NET.	135397	IN	AAAA	2001:500:2d::d
E.ROOT-SERVERS.NET.	393769	IN	A	192.203.230.10
F.ROOT-SERVERS.NET.	439056	IN	A	192.5.5.241
F.ROOT-SERVERS.NET.	134792	IN	AAAA	2001:500:2f::f
G.ROOT-SERVERS.NET.	439720	IN	A	192.112.36.4
H.ROOT-SERVERS.NET.	396758	IN	A	128.63.2.53
H.ROOT-SERVERS.NET.	396758	IN	AAAA	2001:500:1::803f:235
I.ROOT-SERVERS.NET.	438292	IN	A	192.36.148.17
I.ROOT-SERVERS.NET.	438292	IN	AAAA	2001:7fe::53

;; Query time: 7 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri May 18 12:16:59 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1660
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 8

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

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

;; 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: 42 msec
;; SERVER: 2001:500:2f::f#53(F.ROOT-SERVERS.NET)
;; WHEN: Fri May 18 12:16:59 2012
;; MSG SIZE  rcvd: 295

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 5, ADDITIONAL: 2

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

;; AUTHORITY SECTION:
edu.cn.			172800	IN	NS	dns2.edu.cn.
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.

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

;; Query time: 150 msec
;; SERVER: 202.112.0.44#53(ns.cernet.net)
;; WHEN: Fri May 18 12:16:59 2012
;; MSG SIZE  rcvd: 180

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 167
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2

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

;; AUTHORITY SECTION:
buptnet.edu.cn.		172800	IN	NS	GUS.buptnet.edu.cn.
buptnet.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: 339 msec
;; SERVER: 192.76.176.9#53(deneb.dfn.de)
;; WHEN: Fri May 18 12:17:00 2012
;; MSG SIZE  rcvd: 99

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 595
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

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

;; ANSWER SECTION:
buptnet.edu.cn.		172800	IN	SOA	ns.buptnet.edu.cn. hostmaster.buptnet.edu.cn. 200612094 10800 3600 604800 86400

;; AUTHORITY SECTION:
buptnet.edu.cn.		172800	IN	NS	gus.buptnet.edu.cn.
buptnet.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: 151 msec
;; SERVER: 202.112.10.37#53(NS.buptnet.edu.cn)
;; WHEN: Fri May 18 12:17:00 2012
;; MSG SIZE  rcvd: 146

HTTP

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

HEAD / HTTP/1.1
Host: www.buptnet.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 02:47:00 GMT
Server: Apache/2.2.0 (Unix) PHP/5.1.2
X-Powered-By: PHP/5.1.2
Content-Type: text/html

Accessed / [2001:da8:202:10:0:0:0:2] Response: HTTP/1.1 200 OK

SMTP

MX 10 sammy.buptnet.edu.cn
Looking for AAAA on sammy.buptnet.edu.cn

DNS

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

NTP

Looking for an A record for ntp.buptnet.edu.cn
Found an A or AAAA record. Now looking for a AAAA.
ntpdate -sq ntp.buptnet.edu.cn (2001:da8:202:10:0:0:0:2)
server 2001:da8:202:10::2, stratum 2, offset -0.281589, delay 0.28282

XMPP

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

Last Updated: Fri May 18 02:47:03 2012 UTC