Check that www.cuhk.edu.hk 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 cuhk.edu.hk soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21
;; flags: qr ra; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

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

;; ADDITIONAL SECTION:
A.ROOT-SERVERS.NET.	439435	IN	A	198.41.0.4
A.ROOT-SERVERS.NET.	439435	IN	AAAA	2001:503:ba3e::2:30
B.ROOT-SERVERS.NET.	397699	IN	A	192.228.79.201
C.ROOT-SERVERS.NET.	140093	IN	A	192.33.4.12
D.ROOT-SERVERS.NET.	136647	IN	A	128.8.10.90
D.ROOT-SERVERS.NET.	136647	IN	AAAA	2001:500:2d::d
E.ROOT-SERVERS.NET.	395019	IN	A	192.203.230.10
F.ROOT-SERVERS.NET.	440306	IN	A	192.5.5.241
F.ROOT-SERVERS.NET.	136042	IN	AAAA	2001:500:2f::f
G.ROOT-SERVERS.NET.	440970	IN	A	192.112.36.4
H.ROOT-SERVERS.NET.	398008	IN	A	128.63.2.53
H.ROOT-SERVERS.NET.	398008	IN	AAAA	2001:500:1::803f:235
I.ROOT-SERVERS.NET.	439542	IN	A	192.36.148.17
I.ROOT-SERVERS.NET.	439542	IN	AAAA	2001:7fe::53

;; Query time: 7 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri May 18 11:56:09 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1749
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 8, ADDITIONAL: 14

;; QUESTION SECTION:
;cuhk.edu.hk.			IN	SOA

;; AUTHORITY SECTION:
hk.			172800	IN	NS	z.hkirc.net.hk.
hk.			172800	IN	NS	ns2.cuhk.edu.hk.
hk.			172800	IN	NS	adns1.berkeley.edu.
hk.			172800	IN	NS	ns1.hkirc.net.hk.
hk.			172800	IN	NS	b.dns.tw.
hk.			172800	IN	NS	sec3.apnic.net.
hk.			172800	IN	NS	ns2.hkirc.net.hk.
hk.			172800	IN	NS	hk-ns.pch.net.

;; ADDITIONAL SECTION:
b.dns.tw.		172800	IN	A	210.201.138.58
z.hkirc.net.hk.		172800	IN	A	194.146.106.70
ns1.hkirc.net.hk.	172800	IN	A	203.119.2.18
ns2.cuhk.edu.hk.	172800	IN	A	137.189.6.21
ns2.hkirc.net.hk.	172800	IN	A	203.119.87.19
sec3.apnic.net.		172800	IN	A	202.12.28.140
adns1.berkeley.edu.	172800	IN	A	128.32.136.3
hk-ns.pch.net.		172800	IN	A	204.61.216.46
b.dns.tw.		172800	IN	AAAA	2404:0:10a0::58
z.hkirc.net.hk.		172800	IN	AAAA	2001:67c:1010:17::53
ns2.cuhk.edu.hk.	172800	IN	AAAA	2405:3000:3:60::21
ns2.hkirc.net.hk.	172800	IN	AAAA	2001:dca:1000::cb77:5713
sec3.apnic.net.		172800	IN	AAAA	2001:dc0:1:0:4777::140
adns1.berkeley.edu.	172800	IN	AAAA	2607:f140:ffff:fffe::3

;; Query time: 125 msec
;; SERVER: 2001:dc3::35#53(M.ROOT-SERVERS.NET)
;; WHEN: Fri May 18 11:56:09 2012
;; MSG SIZE  rcvd: 511

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 964
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 3, ADDITIONAL: 6

;; QUESTION SECTION:
;cuhk.edu.hk.			IN	SOA

;; AUTHORITY SECTION:
cuhk.edu.hk.		28800	IN	NS	NS2.cuhk.edu.hk.
cuhk.edu.hk.		28800	IN	NS	NS1.cuhk.edu.hk.
cuhk.edu.hk.		28800	IN	NS	NS3.cuhk.edu.hk.

;; ADDITIONAL SECTION:
NS1.cuhk.edu.hk.	28800	IN	A	137.189.6.1
NS1.cuhk.edu.hk.	28800	IN	AAAA	2405:3000:3:60::1
NS2.cuhk.edu.hk.	28800	IN	A	137.189.6.21
NS2.cuhk.edu.hk.	28800	IN	AAAA	2405:3000:3:60::21
NS3.cuhk.edu.hk.	28800	IN	A	202.45.188.39
NS3.cuhk.edu.hk.	28800	IN	AAAA	2405:3001:1:58::1:39

;; Query time: 146 msec
;; SERVER: 2001:dca:1000::cb77:5713#53(ns2.hkirc.net.hk)
;; WHEN: Fri May 18 11:56:09 2012
;; MSG SIZE  rcvd: 215

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1861
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 6

;; QUESTION SECTION:
;cuhk.edu.hk.			IN	SOA

;; ANSWER SECTION:
cuhk.edu.hk.		172800	IN	SOA	ns1.cuhk.edu.hk. hostmaster.cuhk.edu.hk. 201205170 3600 900 1814400 300

;; AUTHORITY SECTION:
cuhk.edu.hk.		3600	IN	NS	ns3.cuhk.edu.hk.
cuhk.edu.hk.		3600	IN	NS	ns1.cuhk.edu.hk.
cuhk.edu.hk.		3600	IN	NS	ns2.cuhk.edu.hk.

;; ADDITIONAL SECTION:
ns1.cuhk.edu.hk.	172800	IN	A	137.189.6.1
ns1.cuhk.edu.hk.	172800	IN	AAAA	2405:3000:3:60::1
ns2.cuhk.edu.hk.	172800	IN	A	137.189.6.21
ns2.cuhk.edu.hk.	172800	IN	AAAA	2405:3000:3:60::21
ns3.cuhk.edu.hk.	172800	IN	A	202.45.188.39
ns3.cuhk.edu.hk.	172800	IN	AAAA	2405:3001:1:58::1:39

;; Query time: 109 msec
;; SERVER: 2405:3000:3:60::21#53(NS2.cuhk.edu.hk)
;; WHEN: Fri May 18 11:56:10 2012
;; MSG SIZE  rcvd: 262

HTTP

Looking for CNAME of www.cuhk.edu.hk
Checking if there is a AAAA for www.cuhk.edu.hk ... success.
Sending...

HEAD / HTTP/1.1
Host: www.cuhk.edu.hk
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 02:26:10 GMT
Server: Apache/2.0.52 (Unix) DAV/2 mod_ssl/2.0.52 OpenSSL/0.9.7d PHP/5.0.2
Content-Location: index.html.en
Vary: negotiate,accept-language
TCN: choice
Last-Modified: Mon, 14 Dec 2009 09:42:15 GMT
ETag: "10c43b-19d-16a9cbc0;c0440-10a-a080d780"
Accept-Ranges: bytes
Content-Length: 413
Content-Type: text/html
Content-Language: en

Accessed / [2405:3000:3:b0:137:189:11:72] Response: HTTP/1.1 200 OK

SMTP

MX 10 cwemgw2.itsc.cuhk.edu.hk
Looking for AAAA on cwemgw2.itsc.cuhk.edu.hk
MX 10 cwemgw3.itsc.cuhk.edu.hk
Looking for AAAA on cwemgw3.itsc.cuhk.edu.hk
MX 10 cwemgw4.itsc.cuhk.edu.hk
Looking for AAAA on cwemgw4.itsc.cuhk.edu.hk
MX 10 cwemgw1.itsc.cuhk.edu.hk
Looking for AAAA on cwemgw1.itsc.cuhk.edu.hk

DNS

Looking for AAAA of NS ns1.cuhk.edu.hk
Querying 2405:3000:3:60:0:0:0:1 for SOA of cuhk.edu.hk over IPv6 ... successful!
Looking for AAAA of NS NS2.cuhk.edu.hk
Querying 2405:3000:3:60:0:0:0:21 for SOA of cuhk.edu.hk over IPv6 ... successful!
Looking for AAAA of NS ns3.cuhk.edu.hk
Querying 2405:3001:1:58:0:0:1:39 for SOA of cuhk.edu.hk over IPv6 ... successful!

NTP

Looking for an A record for ntp.cuhk.edu.hk
Found an A or AAAA record. Now looking for a AAAA.
ntpdate -sq ntp.cuhk.edu.hk (2405:3000:3:b0:137:189:11:149)
server 2405:3000:3:b0:137:189:11:149, stratum 2, offset -0.001652, delay 0.13443

XMPP

Looking for a SRV record for _xmpp-client._tcp.cuhk.edu.hk
Looking for a SRV record for _xmpp-server._tcp.cuhk.edu.hk

Last Updated: Fri May 18 02:26:13 2012 UTC