Check that www.engin.com.au 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 engin.com.au soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 323
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			23933	IN	NS	l.root-servers.net.
.			23933	IN	NS	a.root-servers.net.
.			23933	IN	NS	k.root-servers.net.
.			23933	IN	NS	f.root-servers.net.
.			23933	IN	NS	j.root-servers.net.
.			23933	IN	NS	g.root-servers.net.
.			23933	IN	NS	d.root-servers.net.
.			23933	IN	NS	e.root-servers.net.
.			23933	IN	NS	i.root-servers.net.
.			23933	IN	NS	h.root-servers.net.
.			23933	IN	NS	c.root-servers.net.
.			23933	IN	NS	m.root-servers.net.
.			23933	IN	NS	b.root-servers.net.

;; ADDITIONAL SECTION:
k.root-servers.net.	513451	IN	A	193.0.14.129
k.root-servers.net.	513451	IN	AAAA	2001:7fd::1
a.root-servers.net.	511925	IN	A	198.41.0.4
a.root-servers.net.	511925	IN	AAAA	2001:503:ba3e::2:30
c.root-servers.net.	212583	IN	A	192.33.4.12
d.root-servers.net.	209137	IN	A	128.8.10.90
d.root-servers.net.	209137	IN	AAAA	2001:500:2d::d
j.root-servers.net.	124195	IN	A	192.58.128.30
j.root-servers.net.	124195	IN	AAAA	2001:503:c27::2:30
b.root-servers.net.	470189	IN	A	192.228.79.201
e.root-servers.net.	467509	IN	A	192.203.230.10
i.root-servers.net.	512032	IN	A	192.36.148.17
i.root-servers.net.	512032	IN	AAAA	2001:7fe::53
f.root-servers.net.	512796	IN	A	192.5.5.241

;; Query time: 16 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu May 17 15:47:59 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1237
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 12, ADDITIONAL: 15

;; QUESTION SECTION:
;engin.com.au.			IN	SOA

;; AUTHORITY SECTION:
au.			172800	IN	NS	b.au.
au.			172800	IN	NS	u.au.
au.			172800	IN	NS	r.au.
au.			172800	IN	NS	m.au.
au.			172800	IN	NS	o.au.
au.			172800	IN	NS	s.au.
au.			172800	IN	NS	h.au.
au.			172800	IN	NS	p.au.
au.			172800	IN	NS	v.au.
au.			172800	IN	NS	l.au.
au.			172800	IN	NS	a.au.
au.			172800	IN	NS	n.au.

;; ADDITIONAL SECTION:
a.au.			172800	IN	A	58.65.254.73
b.au.			172800	IN	A	58.65.253.73
h.au.			172800	IN	A	202.65.13.73
l.au.			172800	IN	A	209.112.113.34
m.au.			172800	IN	A	209.112.114.34
n.au.			172800	IN	A	69.36.145.34
o.au.			172800	IN	A	69.36.146.34
p.au.			172800	IN	A	72.13.46.34
r.au.			172800	IN	A	128.32.136.3
s.au.			172800	IN	A	128.32.136.14
u.au.			172800	IN	A	211.29.133.32
v.au.			172800	IN	A	202.12.31.141
l.au.			172800	IN	AAAA	2001:500:856e::6:34
r.au.			172800	IN	AAAA	2607:f140:ffff:fffe::3
s.au.			172800	IN	AAAA	2607:f140:ffff:fffe::e

;; Query time: 130 msec
;; SERVER: 192.112.36.4#53(g.root-servers.net)
;; WHEN: Thu May 17 15:47:59 2012
;; MSG SIZE  rcvd: 498

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 899
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;engin.com.au.			IN	SOA

;; AUTHORITY SECTION:
engin.com.au.		14400	IN	NS	ns01.engin.com.au.
engin.com.au.		14400	IN	NS	ns02.engin.com.au.

;; ADDITIONAL SECTION:
ns01.engin.com.au.	14400	IN	A	202.61.12.231
ns02.engin.com.au.	14400	IN	A	202.61.13.103

;; Query time: 23 msec
;; SERVER: 202.65.13.73#53(h.au)
;; WHEN: Thu May 17 15:47:59 2012
;; MSG SIZE  rcvd: 100

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 555
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;engin.com.au.			IN	SOA

;; ANSWER SECTION:
engin.com.au.		10800	IN	SOA	ns01.engin.com.au. hostmaster.engin.com.au. 2011051712 3600 600 2419200 3600

;; AUTHORITY SECTION:
engin.com.au.		10800	IN	NS	ns05.engin.com.au.
engin.com.au.		10800	IN	NS	ns06.engin.com.au.
engin.com.au.		10800	IN	NS	ns01.engin.com.au.
engin.com.au.		10800	IN	NS	ns02.engin.com.au.

;; ADDITIONAL SECTION:
ns01.engin.com.au.	3600	IN	A	202.61.12.231
ns02.engin.com.au.	3600	IN	A	202.61.13.103
ns05.engin.com.au.	3600	IN	A	203.161.169.210
ns06.engin.com.au.	3600	IN	A	203.161.169.211

;; Query time: 22 msec
;; SERVER: 202.61.12.231#53(ns01.engin.com.au)
;; WHEN: Thu May 17 15:47:59 2012
;; MSG SIZE  rcvd: 217

HTTP

Looking for CNAME of www.engin.com.au
Checking if there is a AAAA for www.engin.com.au ... FAILED.


; <<>> DiG 9.4.1-P1 <<>> www.engin.com.au aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 986
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;www.engin.com.au.		IN	AAAA

;; ANSWER SECTION:
www.engin.com.au.	10800	IN	CNAME	engin.com.au.

;; AUTHORITY SECTION:
engin.com.au.		3600	IN	SOA	ns01.engin.com.au. hostmaster.engin.com.au. 2011051712 3600 600 2419200 3600

;; Query time: 5 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu May 17 15:47:59 2012
;; MSG SIZE  rcvd: 100

Checking other options ... failed too.

SMTP

MX 5 mgw01.engin.com.au
Looking for AAAA on mgw01.engin.com.au
MX 5 mgw02.engin.com.au
Looking for AAAA on mgw02.engin.com.au

DNS

Looking for AAAA of NS ns05.engin.com.au
No AAAA record for ns05.engin.com.au
Looking for AAAA of NS ns02.engin.com.au
No AAAA record for ns02.engin.com.au
Looking for AAAA of NS ns01.engin.com.au
No AAAA record for ns01.engin.com.au
Looking for AAAA of NS ns06.engin.com.au
No AAAA record for ns06.engin.com.au

NTP

Looking for an A record for ntp.engin.com.au
Looking for an A record for clock.engin.com.au
Looking for an A record for time.engin.com.au
Looking for an A record for chime.engin.com.au

XMPP

Looking for a SRV record for _xmpp-client._tcp.engin.com.au
Looking for a SRV record for _xmpp-server._tcp.engin.com.au

Last Updated: Thu May 17 06:18:00 2012 UTC