Check that www.ust.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 ust.hk soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1311
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			137789	IN	NS	j.root-servers.net.
.			137789	IN	NS	b.root-servers.net.
.			137789	IN	NS	d.root-servers.net.
.			137789	IN	NS	l.root-servers.net.
.			137789	IN	NS	e.root-servers.net.
.			137789	IN	NS	m.root-servers.net.
.			137789	IN	NS	c.root-servers.net.
.			137789	IN	NS	g.root-servers.net.
.			137789	IN	NS	f.root-servers.net.
.			137789	IN	NS	a.root-servers.net.
.			137789	IN	NS	h.root-servers.net.
.			137789	IN	NS	i.root-servers.net.
.			137789	IN	NS	k.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	7112	IN	A	198.41.0.4
a.root-servers.net.	7112	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	483777	IN	A	192.228.79.201
c.root-servers.net.	353160	IN	A	192.33.4.12
d.root-servers.net.	311509	IN	A	128.8.10.90
d.root-servers.net.	311509	IN	AAAA	2001:500:2d::d
e.root-servers.net.	483777	IN	A	192.203.230.10
f.root-servers.net.	7983	IN	A	192.5.5.241
f.root-servers.net.	312859	IN	AAAA	2001:500:2f::f
g.root-servers.net.	8647	IN	A	192.112.36.4
h.root-servers.net.	570498	IN	A	128.63.2.53
h.root-servers.net.	570498	IN	AAAA	2001:500:1::803f:235
i.root-servers.net.	7219	IN	A	192.36.148.17
i.root-servers.net.	7219	IN	AAAA	2001:7fe::53

;; Query time: 8 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed May 23 12:01:32 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1449
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 8, ADDITIONAL: 13

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

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

;; 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

;; Query time: 125 msec
;; SERVER: 2001:dc3::35#53(m.root-servers.net)
;; WHEN: Wed May 23 12:01:32 2012
;; MSG SIZE  rcvd: 487

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 587
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2

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

;; AUTHORITY SECTION:
ust.hk.			28800	IN	NS	USTSU2.ust.hk.
ust.hk.			28800	IN	NS	USTSU1.ust.hk.

;; ADDITIONAL SECTION:
USTSU1.ust.hk.		28800	IN	A	143.89.14.7
USTSU2.ust.hk.		28800	IN	A	143.89.14.8

;; Query time: 109 msec
;; SERVER: 2405:3000:3:60::21#53(ns2.cuhk.edu.hk)
;; WHEN: Wed May 23 12:01:32 2012
;; MSG SIZE  rcvd: 98

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 299
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

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

;; ANSWER SECTION:
ust.hk.			3600	IN	SOA	ustsu1.ust.hk. postmaster.ust.hk. 2012052204 3600 1200 604800 3600

;; AUTHORITY SECTION:
ust.hk.			3600	IN	NS	ustsu2.ust.hk.
ust.hk.			3600	IN	NS	ustsu1.ust.hk.

;; ADDITIONAL SECTION:
ustsu1.ust.hk.		3600	IN	A	143.89.14.7
ustsu2.ust.hk.		3600	IN	A	143.89.14.8

;; Query time: 113 msec
;; SERVER: 143.89.14.8#53(USTSU2.ust.hk)
;; WHEN: Wed May 23 12:01:32 2012
;; MSG SIZE  rcvd: 145

HTTP

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


; <<>> DiG 9.4.1-P1 <<>> www.ust.hk aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 777
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

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

;; AUTHORITY SECTION:
ust.hk.			3600	IN	SOA	ustsu1.ust.hk. postmaster.ust.hk. 2012052204 3600 1200 604800 3600

;; Query time: 4 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed May 23 12:01:33 2012
;; MSG SIZE  rcvd: 82

Checking other options ... succeeded as www.ipv6.ust.hk.
Connection failed: IO::Socket::INET6: connect: Connection timed out

Ping to www.ipv6.ust.hk [2001:ce0:7:1:210:4bff:fe98:5f26]

ICMPv6 Hop limit exceeded in transit from 2001:ce0:7:1::11
 for icmp6 from 2001:44b8:60::2 to 2001:ce0:7:1:210:4bff:fe98:5f26
no answer from 2001:ce0:7:1:210:4bff:fe98:5f26

Traceroute to www.ipv6.ust.hk [2001:ce0:7:1:210:4bff:fe98:5f26]

 1  2001:44b8:60::1  0.699 ms  0.625 ms  0.465 ms
 2  2001:44b8:8060:18::6  0.880 ms  0.970 ms  1.168 ms
 3  2001:44b8:8060:34::1  0.887 ms  0.715 ms  0.676 ms
 4  2001:44b8:b060:7::2  20.454 ms  20.276 ms  20.169 ms
 5  2001:44b8:b070:1::12  20.506 ms  20.439 ms  20.416 ms
 6  2001:44b8:f0a0:5::1  121.477 ms  121.330 ms  121.390 ms
 7  2001:218:2000:5000::15  121.213 ms  124.603 ms  121.110 ms
 8  2001:218:0:2000::91  140.593 ms  121.816 ms  192.185 ms
 9  2001:218:0:2000::13e  173.723 ms  175.135 ms  176.308 ms
10  2001:218:0:2000::159  174.543 ms  174.521 ms  174.446 ms
11  2001:218:0:6000::156  174.221 ms  174.272 ms  174.347 ms
12  2001:7fa:0:1::ca28:a117  142.180 ms  140.997 ms  140.565 ms
13  * * *
14  2001:ce0:7:1::11  141.925 ms  142.303 ms  141.680 ms
15  2001:ce0:7:1::12  144.824 ms  143.733 ms  147.239 ms
16  2001:ce0:7:1::11  142.564 ms  159.428 ms  160.196 ms
17  2001:ce0:7:1::12  144.447 ms  144.702 ms  143.925 ms
18  2001:ce0:7:1::11  142.822 ms  144.077 ms  141.854 ms
19  2001:ce0:7:1::12  143.900 ms  144.729 ms  144.572 ms
20  2001:ce0:7:1::11  143.426 ms  142.741 ms  143.160 ms
21  2001:ce0:7:1::12  145.127 ms  144.194 ms  145.992 ms
22  2001:ce0:7:1::11  142.413 ms  142.877 ms  143.161 ms
23  2001:ce0:7:1::12  144.897 ms  144.486 ms  144.934 ms
24  2001:ce0:7:1::11  142.465 ms  142.608 ms  143.407 ms
25  2001:ce0:7:1::12  144.485 ms  145.107 ms  144.693 ms
26  2001:ce0:7:1::11  143.150 ms  143.928 ms  142.898 ms
27  2001:ce0:7:1::12  145.531 ms  144.799 ms  145.035 ms
28  2001:ce0:7:1::11  143.217 ms  143.664 ms  143.525 ms
29  2001:ce0:7:1::12  144.815 ms  145.499 ms  145.425 ms
30  2001:ce0:7:1::11  143.582 ms  143.590 ms  143.115 ms

SMTP

MX 10 mx1.ust.hk
Looking for AAAA on mx1.ust.hk
MX 10 mx2.ust.hk
Looking for AAAA on mx2.ust.hk

DNS

Looking for AAAA of NS USTSU2.ust.hk
No AAAA record for USTSU2.ust.hk
Looking for AAAA of NS ustsu1.ust.hk
No AAAA record for ustsu1.ust.hk

NTP

Looking for an A record for ntp.ust.hk
Looking for an A record for clock.ust.hk
Looking for an A record for time.ust.hk
Looking for an A record for chime.ust.hk

XMPP

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

Last Updated: Wed May 23 02:35:49 2012 UTC