Check that www.polyu.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 polyu.edu.hk soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1889
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			224043	IN	NS	g.root-servers.net.
.			224043	IN	NS	h.root-servers.net.
.			224043	IN	NS	k.root-servers.net.
.			224043	IN	NS	a.root-servers.net.
.			224043	IN	NS	e.root-servers.net.
.			224043	IN	NS	b.root-servers.net.
.			224043	IN	NS	c.root-servers.net.
.			224043	IN	NS	m.root-servers.net.
.			224043	IN	NS	d.root-servers.net.
.			224043	IN	NS	i.root-servers.net.
.			224043	IN	NS	j.root-servers.net.
.			224043	IN	NS	f.root-servers.net.
.			224043	IN	NS	l.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	93366	IN	A	198.41.0.4
a.root-servers.net.	93366	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	51630	IN	A	192.228.79.201
c.root-servers.net.	439414	IN	A	192.33.4.12
d.root-servers.net.	397763	IN	A	128.8.10.90
d.root-servers.net.	397763	IN	AAAA	2001:500:2d::d
e.root-servers.net.	48950	IN	A	192.203.230.10
f.root-servers.net.	94237	IN	A	192.5.5.241
f.root-servers.net.	399113	IN	AAAA	2001:500:2f::f
g.root-servers.net.	94901	IN	A	192.112.36.4
h.root-servers.net.	51939	IN	A	128.63.2.53
h.root-servers.net.	51939	IN	AAAA	2001:500:1::803f:235
i.root-servers.net.	93473	IN	A	192.36.148.17
i.root-servers.net.	93473	IN	AAAA	2001:7fe::53

;; Query time: 7 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue May 22 12:03:58 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1627
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 8, ADDITIONAL: 13

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

;; AUTHORITY SECTION:
hk.			172800	IN	NS	b.dns.tw.
hk.			172800	IN	NS	z.hkirc.net.hk.
hk.			172800	IN	NS	ns1.hkirc.net.hk.
hk.			172800	IN	NS	ns2.cuhk.edu.hk.
hk.			172800	IN	NS	ns2.hkirc.net.hk.
hk.			172800	IN	NS	sec3.apnic.net.
hk.			172800	IN	NS	adns1.berkeley.edu.
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: 249 msec
;; SERVER: 2001:500:1::803f:235#53(h.root-servers.net)
;; WHEN: Tue May 22 12:03:58 2012
;; MSG SIZE  rcvd: 495

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 349
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2

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

;; AUTHORITY SECTION:
polyu.edu.hk.		28800	IN	NS	HKPU01.polyu.edu.hk.
polyu.edu.hk.		28800	IN	NS	HKPU03.polyu.edu.hk.

;; ADDITIONAL SECTION:
HKPU01.polyu.edu.hk.	28800	IN	A	158.132.14.1
HKPU03.polyu.edu.hk.	28800	IN	A	158.132.18.1

;; Query time: 146 msec
;; SERVER: 2001:dca:1000::cb77:5713#53(ns2.hkirc.net.hk)
;; WHEN: Tue May 22 12:03:59 2012
;; MSG SIZE  rcvd: 104

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 754
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

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

;; ANSWER SECTION:
polyu.edu.hk.		3600	IN	SOA	hkpu01.polyu.edu.hk. its-dns.polyu.edu.hk. 2012051801 3600 3600 604800 3600

;; AUTHORITY SECTION:
polyu.edu.hk.		3600	IN	NS	hkpu01.polyu.edu.hk.
polyu.edu.hk.		3600	IN	NS	hkpu03.polyu.edu.hk.

;; ADDITIONAL SECTION:
hkpu01.polyu.edu.hk.	3600	IN	A	158.132.14.1
hkpu03.polyu.edu.hk.	3600	IN	A	158.132.18.1

;; Query time: 115 msec
;; SERVER: 158.132.18.1#53(HKPU03.polyu.edu.hk)
;; WHEN: Tue May 22 12:04:00 2012
;; MSG SIZE  rcvd: 148

HTTP

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


; <<>> DiG 9.4.1-P1 <<>> www.polyu.edu.hk aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1224
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

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

;; AUTHORITY SECTION:
polyu.edu.hk.		3600	IN	SOA	hkpu01.polyu.edu.hk. its-dns.polyu.edu.hk. 2012051801 3600 3600 604800 3600

;; Query time: 4 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue May 22 12:04:00 2012
;; MSG SIZE  rcvd: 85

Checking other options ... failed too.

SMTP

MX 10 qr.polyu.edu.hk
Looking for AAAA on qr.polyu.edu.hk

DNS

Looking for AAAA of NS hkpu01.polyu.edu.hk
No AAAA record for hkpu01.polyu.edu.hk
Looking for AAAA of NS HKPU03.polyu.edu.hk
No AAAA record for HKPU03.polyu.edu.hk

NTP

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

XMPP

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

Last Updated: Tue May 22 02:34:03 2012 UTC