Check that www.ln.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 ln.edu.hk soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1515
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			311817	IN	NS	d.root-servers.net.
.			311817	IN	NS	a.root-servers.net.
.			311817	IN	NS	j.root-servers.net.
.			311817	IN	NS	c.root-servers.net.
.			311817	IN	NS	f.root-servers.net.
.			311817	IN	NS	h.root-servers.net.
.			311817	IN	NS	l.root-servers.net.
.			311817	IN	NS	g.root-servers.net.
.			311817	IN	NS	k.root-servers.net.
.			311817	IN	NS	m.root-servers.net.
.			311817	IN	NS	e.root-servers.net.
.			311817	IN	NS	i.root-servers.net.
.			311817	IN	NS	b.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	181140	IN	A	198.41.0.4
a.root-servers.net.	181140	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	139404	IN	A	192.228.79.201
c.root-servers.net.	527188	IN	A	192.33.4.12
d.root-servers.net.	485537	IN	A	128.8.10.90
d.root-servers.net.	485537	IN	AAAA	2001:500:2d::d
e.root-servers.net.	136724	IN	A	192.203.230.10
f.root-servers.net.	182011	IN	A	192.5.5.241
f.root-servers.net.	486887	IN	AAAA	2001:500:2f::f
g.root-servers.net.	182675	IN	A	192.112.36.4
h.root-servers.net.	139713	IN	A	128.63.2.53
h.root-servers.net.	139713	IN	AAAA	2001:500:1::803f:235
i.root-servers.net.	181247	IN	A	192.36.148.17
i.root-servers.net.	181247	IN	AAAA	2001:7fe::53

;; Query time: 8 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon May 21 11:41:04 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1683
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 8, ADDITIONAL: 13

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

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

;; Query time: 250 msec
;; SERVER: 2001:500:2d::d#53(d.root-servers.net)
;; WHEN: Mon May 21 11:41:04 2012
;; MSG SIZE  rcvd: 486

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1221
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 6

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

;; AUTHORITY SECTION:
edu.hk.			604800	IN	NS	HK-NS.PCH.NET.
edu.hk.			604800	IN	NS	NS2.CUHK.edu.hk.
edu.hk.			604800	IN	NS	NS2.HKIRC.NET.hk.
edu.hk.			604800	IN	NS	Z.HKIRC.NET.hk.
edu.hk.			604800	IN	NS	NS1.HKIRC.NET.hk.
edu.hk.			604800	IN	NS	B.DNS.TW.

;; ADDITIONAL SECTION:
Z.HKIRC.NET.hk.		604800	IN	A	194.146.106.70
Z.HKIRC.NET.hk.		604800	IN	AAAA	2001:67c:1010:17::53
NS1.HKIRC.NET.hk.	604800	IN	A	203.119.2.18
NS2.CUHK.edu.hk.	604800	IN	A	137.189.6.21
NS2.HKIRC.NET.hk.	604800	IN	A	203.119.87.19
NS2.HKIRC.NET.hk.	604800	IN	AAAA	2001:dca:1000::cb77:5713

;; Query time: 199 msec
;; SERVER: 2001:dc0:1:0:4777::140#53(sec3.apnic.net)
;; WHEN: Mon May 21 11:41:05 2012
;; MSG SIZE  rcvd: 281

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1703
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 3, ADDITIONAL: 4

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

;; AUTHORITY SECTION:
ln.edu.hk.		28800	IN	NS	DNS1.ln.edu.hk.
ln.edu.hk.		28800	IN	NS	DNS2.ln.edu.hk.
ln.edu.hk.		28800	IN	NS	NS2.CUHK.edu.hk.

;; ADDITIONAL SECTION:
NS2.CUHK.edu.hk.	28800	IN	A	137.189.6.21
NS2.CUHK.edu.hk.	28800	IN	AAAA	2405:3000:3:60::21
DNS1.ln.edu.hk.		28800	IN	A	202.40.192.254
DNS2.ln.edu.hk.		28800	IN	A	202.40.192.242

;; Query time: 113 msec
;; SERVER: 203.119.2.18#53(NS1.HKIRC.NET.hk)
;; WHEN: Mon May 21 11:41:05 2012
;; MSG SIZE  rcvd: 164

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 509
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 2

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

;; ANSWER SECTION:
ln.edu.hk.		3600	IN	SOA	dns1.ln.edu.hk. root.dns1.ln.edu.hk. 19532140 1200 300 600 1200

;; AUTHORITY SECTION:
ln.edu.hk.		3600	IN	NS	dns2.ln.edu.hk.
ln.edu.hk.		3600	IN	NS	dns1.ln.edu.hk.
ln.edu.hk.		3600	IN	NS	ns2.cuhk.edu.hk.

;; ADDITIONAL SECTION:
dns1.ln.edu.hk.		3600	IN	A	202.40.192.254
dns2.ln.edu.hk.		3600	IN	A	202.40.192.242

;; Query time: 115 msec
;; SERVER: 202.40.192.242#53(DNS2.ln.edu.hk)
;; WHEN: Mon May 21 11:41:06 2012
;; MSG SIZE  rcvd: 161

HTTP

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


; <<>> DiG 9.4.1-P1 <<>> www.ln.edu.hk aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2034
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;www.ln.edu.hk.			IN	AAAA

;; AUTHORITY SECTION:
ln.edu.hk.		1199	IN	SOA	dns1.ln.edu.hk. root.dns1.ln.edu.hk. 19532140 1200 300 600 1200

;; Query time: 4 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon May 21 11:41:07 2012
;; MSG SIZE  rcvd: 77

Checking other options ... failed too.

SMTP

MX 20 spamtest05.ln.edu.hk
Looking for AAAA on spamtest05.ln.edu.hk
MX 20 mx01.ln.edu.hk
Looking for AAAA on mx01.ln.edu.hk
MX 20 spamtest04.ln.edu.hk
Looking for AAAA on spamtest04.ln.edu.hk

DNS

Looking for AAAA of NS dns1.ln.edu.hk
No AAAA record for dns1.ln.edu.hk
Looking for AAAA of NS DNS2.ln.edu.hk
No AAAA record for DNS2.ln.edu.hk
Looking for AAAA of NS ns2.cuhk.edu.hk
Querying 2405:3000:3:60:0:0:0:21 for SOA of ln.edu.hk over IPv6 ... successful!

NTP

Looking for an A record for ntp.ln.edu.hk
Looking for an A record for clock.ln.edu.hk
Looking for an A record for time.ln.edu.hk
Looking for an A record for chime.ln.edu.hk

XMPP

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

Last Updated: Mon May 21 02:11:09 2012 UTC