Check that www.hku.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 hku.hk soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1337
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			311542	IN	NS	l.root-servers.net.
.			311542	IN	NS	e.root-servers.net.
.			311542	IN	NS	a.root-servers.net.
.			311542	IN	NS	i.root-servers.net.
.			311542	IN	NS	f.root-servers.net.
.			311542	IN	NS	j.root-servers.net.
.			311542	IN	NS	k.root-servers.net.
.			311542	IN	NS	g.root-servers.net.
.			311542	IN	NS	b.root-servers.net.
.			311542	IN	NS	d.root-servers.net.
.			311542	IN	NS	h.root-servers.net.
.			311542	IN	NS	m.root-servers.net.
.			311542	IN	NS	c.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	180865	IN	A	198.41.0.4
a.root-servers.net.	180865	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	139129	IN	A	192.228.79.201
c.root-servers.net.	526913	IN	A	192.33.4.12
d.root-servers.net.	485262	IN	A	128.8.10.90
d.root-servers.net.	485262	IN	AAAA	2001:500:2d::d
e.root-servers.net.	136449	IN	A	192.203.230.10
f.root-servers.net.	181736	IN	A	192.5.5.241
f.root-servers.net.	486612	IN	AAAA	2001:500:2f::f
g.root-servers.net.	182400	IN	A	192.112.36.4
h.root-servers.net.	139438	IN	A	128.63.2.53
h.root-servers.net.	139438	IN	AAAA	2001:500:1::803f:235
i.root-servers.net.	180972	IN	A	192.36.148.17
i.root-servers.net.	180972	IN	AAAA	2001:7fe::53

;; Query time: 7 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon May 21 11:45:39 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 991
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 8, ADDITIONAL: 13

;; QUESTION SECTION:
;hku.hk.				IN	SOA

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

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

;; Query time: 134 msec
;; SERVER: 2001:503:ba3e::2:30#53(a.root-servers.net)
;; WHEN: Mon May 21 11:45:39 2012
;; MSG SIZE  rcvd: 499

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1871
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 5, ADDITIONAL: 5

;; QUESTION SECTION:
;hku.hk.				IN	SOA

;; AUTHORITY SECTION:
hku.hk.			28800	IN	NS	NS1.hku.hk.
hku.hk.			28800	IN	NS	NS2.hku.hk.
hku.hk.			28800	IN	NS	NS4.hku.hk.
hku.hk.			28800	IN	NS	NS3.hku.hk.
hku.hk.			28800	IN	NS	NS2.CUHK.EDU.hk.

;; ADDITIONAL SECTION:
NS1.hku.hk.		28800	IN	A	147.8.2.3
NS2.hku.hk.		28800	IN	A	147.8.145.32
NS2.CUHK.EDU.hk.	604800	IN	A	137.189.6.21
NS3.hku.hk.		28800	IN	A	147.8.2.2
NS4.hku.hk.		28800	IN	A	147.8.145.30

;; Query time: 22 msec
;; SERVER: 2001:500:14:6046:ad::1#53(hk-ns.pch.net)
;; WHEN: Mon May 21 11:45:39 2012
;; MSG SIZE  rcvd: 203

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1611
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 5, ADDITIONAL: 4

;; QUESTION SECTION:
;hku.hk.				IN	SOA

;; ANSWER SECTION:
hku.hk.			86400	IN	SOA	ns1.hku.hk. ccssg.hkusua.hku.hk. 2012051702 3600 900 604800 43200

;; AUTHORITY SECTION:
hku.hk.			86400	IN	NS	ns1.hku.hk.
hku.hk.			86400	IN	NS	ns4.hku.hk.
hku.hk.			86400	IN	NS	ns2.hku.hk.
hku.hk.			86400	IN	NS	ns3.hku.hk.
hku.hk.			86400	IN	NS	ns2.cuhk.edu.hk.

;; ADDITIONAL SECTION:
ns1.hku.hk.		86400	IN	A	147.8.2.3
ns2.hku.hk.		86400	IN	A	147.8.145.32
ns3.hku.hk.		86400	IN	A	147.8.2.2
ns4.hku.hk.		86400	IN	A	147.8.145.30

;; Query time: 113 msec
;; SERVER: 147.8.145.32#53(NS2.hku.hk)
;; WHEN: Mon May 21 11:45:39 2012
;; MSG SIZE  rcvd: 236

HTTP

Looking for CNAME of www.hku.hk
Checking if there is a AAAA for www.hku.hk ... FAILED.


; <<>> DiG 9.4.1-P1 <<>> www.hku.hk aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 803
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;www.hku.hk.			IN	AAAA

;; AUTHORITY SECTION:
hku.hk.			10800	IN	SOA	ns1.hku.hk. ccssg.hkusua.hku.hk. 2012051702 3600 900 604800 43200

;; Query time: 4 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon May 21 11:45:40 2012
;; MSG SIZE  rcvd: 81

Checking other options ... succeeded as www.ipv6.hku.hk.
Connection failed: IO::Socket::INET6: connect: No route to host

Ping to www.ipv6.hku.hk [2001:ce0:2:123:20d:60ff:fe4d:e7ef]

ICMPv6 Address Unreachable from gateway 2001:ce0:2:999::6
 for icmp6 from 2001:44b8:60::2 to 2001:ce0:2:123:20d:60ff:fe4d:e7ef
no answer from 2001:ce0:2:123:20d:60ff:fe4d:e7ef

Traceroute to www.ipv6.hku.hk [2001:ce0:2:123:20d:60ff:fe4d:e7ef]

 1  2001:44b8:60::1  0.788 ms  0.631 ms  0.481 ms
 2  2001:44b8:8060:18::6  0.865 ms  0.867 ms  0.635 ms
 3  2001:44b8:8060:34::1  0.764 ms  0.719 ms  0.501 ms
 4  2001:44b8:b060:7::2  20.099 ms  20.280 ms  20.204 ms
 5  2001:44b8:b070:1::12  20.461 ms  20.269 ms  20.054 ms
 6  2001:44b8:f0a0:5::1  121.238 ms  121.515 ms  121.101 ms
 7  2001:218:2000:5000::15  121.079 ms  121.102 ms  120.915 ms
 8  2001:218:0:2000::91  155.542 ms  121.686 ms  121.730 ms
 9  2001:218:0:2000::13e  174.740 ms  173.027 ms  173.666 ms
10  2001:218:0:2000::159  393.075 ms  175.060 ms  194.055 ms
11  2001:218:0:6000::156  174.284 ms  173.498 ms  173.583 ms
12  2001:7fa:0:1::ca28:a117  141.010 ms  140.415 ms  140.980 ms
13  2001:ce0:1:10::d  143.625 ms  144.196 ms  143.307 ms
14  2001:ce0:2:999::6  144.222 ms  144.308 ms  143.437 ms
15  2001:ce0:2:999::6  143.330 ms !A  144.044 ms !A  143.463 ms !A

SMTP

MX 10 hku-nsp2.hku.hk
Looking for AAAA on hku-nsp2.hku.hk
MX 10 hku-nsp1.hku.hk
Looking for AAAA on hku-nsp1.hku.hk

DNS

Looking for AAAA of NS ns4.hku.hk
No AAAA record for ns4.hku.hk
Looking for AAAA of NS ns2.hku.hk
No AAAA record for ns2.hku.hk
Looking for AAAA of NS ns2.cuhk.edu.hk
Querying 2405:3000:3:60:0:0:0:21 for SOA of hku.hk over IPv6 ... successful!
Looking for AAAA of NS ns1.hku.hk
No AAAA record for ns1.hku.hk
Looking for AAAA of NS ns3.hku.hk
No AAAA record for ns3.hku.hk

NTP

Looking for an A record for ntp.hku.hk
Found an A or AAAA record. Now looking for a AAAA.
Cannot find a AAAA record for ntp.hku.hk
Cannot find a AAAA record for ntp.ipv6.hku.hk

XMPP

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

Last Updated: Mon May 21 02:19:33 2012 UTC