Check that www.nottingham.ac.uk 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 nottingham.ac.uk soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1598
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			301617	IN	NS	g.root-servers.net.
.			301617	IN	NS	e.root-servers.net.
.			301617	IN	NS	a.root-servers.net.
.			301617	IN	NS	h.root-servers.net.
.			301617	IN	NS	l.root-servers.net.
.			301617	IN	NS	k.root-servers.net.
.			301617	IN	NS	j.root-servers.net.
.			301617	IN	NS	m.root-servers.net.
.			301617	IN	NS	b.root-servers.net.
.			301617	IN	NS	i.root-servers.net.
.			301617	IN	NS	f.root-servers.net.
.			301617	IN	NS	d.root-servers.net.
.			301617	IN	NS	c.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	170940	IN	A	198.41.0.4
a.root-servers.net.	170940	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	129204	IN	A	192.228.79.201
c.root-servers.net.	516988	IN	A	192.33.4.12
d.root-servers.net.	475337	IN	A	128.8.10.90
d.root-servers.net.	475337	IN	AAAA	2001:500:2d::d
e.root-servers.net.	126524	IN	A	192.203.230.10
f.root-servers.net.	171811	IN	A	192.5.5.241
f.root-servers.net.	476687	IN	AAAA	2001:500:2f::f
g.root-servers.net.	172475	IN	A	192.112.36.4
h.root-servers.net.	129513	IN	A	128.63.2.53
h.root-servers.net.	129513	IN	AAAA	2001:500:1::803f:235
i.root-servers.net.	171047	IN	A	192.36.148.17
i.root-servers.net.	171047	IN	AAAA	2001:7fe::53

;; Query time: 9 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon May 21 14:31:04 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 660
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 11, ADDITIONAL: 14

;; QUESTION SECTION:
;nottingham.ac.uk.		IN	SOA

;; AUTHORITY SECTION:
uk.			172800	IN	NS	ns1.nic.uk.
uk.			172800	IN	NS	ns2.nic.uk.
uk.			172800	IN	NS	ns3.nic.uk.
uk.			172800	IN	NS	ns4.nic.uk.
uk.			172800	IN	NS	ns5.nic.uk.
uk.			172800	IN	NS	ns6.nic.uk.
uk.			172800	IN	NS	ns7.nic.uk.
uk.			172800	IN	NS	nsa.nic.uk.
uk.			172800	IN	NS	nsb.nic.uk.
uk.			172800	IN	NS	nsc.nic.uk.
uk.			172800	IN	NS	nsd.nic.uk.

;; ADDITIONAL SECTION:
ns1.nic.uk.		172800	IN	A	195.66.240.130
ns2.nic.uk.		172800	IN	A	217.79.164.131
ns3.nic.uk.		172800	IN	A	213.219.13.131
ns4.nic.uk.		172800	IN	A	194.83.244.131
ns5.nic.uk.		172800	IN	A	213.246.167.131
ns6.nic.uk.		172800	IN	A	213.248.254.130
ns7.nic.uk.		172800	IN	A	212.121.40.130
nsa.nic.uk.		172800	IN	A	156.154.100.3
nsb.nic.uk.		172800	IN	A	156.154.101.3
nsc.nic.uk.		172800	IN	A	156.154.102.3
nsd.nic.uk.		172800	IN	A	156.154.103.3
ns1.nic.uk.		172800	IN	AAAA	2a01:40:1001:35::2
ns4.nic.uk.		172800	IN	AAAA	2001:630:181:35::83
nsa.nic.uk.		172800	IN	AAAA	2001:502:ad09::3

;; Query time: 39 msec
;; SERVER: 2001:7fd::1#53(k.root-servers.net)
;; WHEN: Mon May 21 14:31:04 2012
;; MSG SIZE  rcvd: 496

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 7, ADDITIONAL: 0

;; QUESTION SECTION:
;nottingham.ac.uk.		IN	SOA

;; AUTHORITY SECTION:
ac.uk.			172800	IN	NS	ns3.ja.net.
ac.uk.			172800	IN	NS	ns0.ja.net.
ac.uk.			172800	IN	NS	ns2.ja.net.
ac.uk.			172800	IN	NS	ns1.surfnet.nl.
ac.uk.			172800	IN	NS	auth03.ns.uu.net.
ac.uk.			172800	IN	NS	ns4.ja.net.
ac.uk.			172800	IN	NS	ws-fra1.win-ip.dfn.de.

;; Query time: 329 msec
;; SERVER: 217.79.164.131#53(ns2.nic.uk)
;; WHEN: Mon May 21 14:31:05 2012
;; MSG SIZE  rcvd: 202

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 760
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;nottingham.ac.uk.		IN	SOA

;; AUTHORITY SECTION:
nottingham.ac.uk.	86400	IN	NS	extdns1.warwick.ac.uk.
nottingham.ac.uk.	86400	IN	NS	extdns2.warwick.ac.uk.
nottingham.ac.uk.	86400	IN	NS	ns2.nottingham.ac.uk.
nottingham.ac.uk.	86400	IN	NS	ns1.nottingham.ac.uk.

;; ADDITIONAL SECTION:
ns1.nottingham.ac.uk.	86400	IN	A	128.243.40.11
ns2.nottingham.ac.uk.	86400	IN	A	128.243.40.12
extdns1.warwick.ac.uk.	86400	IN	A	137.205.84.17
extdns2.warwick.ac.uk.	86400	IN	A	137.205.84.18

;; Query time: 312 msec
;; SERVER: 2001:630:0:47::42#53(ns4.ja.net)
;; WHEN: Mon May 21 14:31:05 2012
;; MSG SIZE  rcvd: 186

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1612
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;nottingham.ac.uk.		IN	SOA

;; ANSWER SECTION:
nottingham.ac.uk.	3600	IN	SOA	ns1.nottingham.ac.uk. dnsadmin.nottingham.ac.uk. 2012051809 28800 7200 1209600 3600

;; AUTHORITY SECTION:
nottingham.ac.uk.	3600	IN	NS	ns2.nottingham.ac.uk.
nottingham.ac.uk.	3600	IN	NS	ns1.nottingham.ac.uk.
nottingham.ac.uk.	3600	IN	NS	extdns1.warwick.ac.uk.
nottingham.ac.uk.	3600	IN	NS	extdns2.warwick.ac.uk.

;; ADDITIONAL SECTION:
ns1.nottingham.ac.uk.	3600	IN	A	128.243.40.11
ns2.nottingham.ac.uk.	3600	IN	A	128.243.40.12
extdns1.warwick.ac.uk.	3600	IN	A	137.205.84.17
extdns2.warwick.ac.uk.	3600	IN	A	137.205.84.18

;; Query time: 331 msec
;; SERVER: 137.205.84.18#53(extdns2.warwick.ac.uk)
;; WHEN: Mon May 21 14:31:05 2012
;; MSG SIZE  rcvd: 231

HTTP

Looking for CNAME of www.nottingham.ac.uk
Checking if there is a AAAA for www.nottingham.ac.uk ... FAILED.


; <<>> DiG 9.4.1-P1 <<>> www.nottingham.ac.uk aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1121
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;www.nottingham.ac.uk.		IN	AAAA

;; AUTHORITY SECTION:
nottingham.ac.uk.	3600	IN	SOA	ns1.nottingham.ac.uk. dnsadmin.nottingham.ac.uk. 2012051809 28800 7200 1209600 3600

;; Query time: 4 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon May 21 14:31:07 2012
;; MSG SIZE  rcvd: 87

Checking other options ... failed too.

SMTP

MX 1 mx191.emailfiltering.com
Looking for AAAA on mx191.emailfiltering.com
MX 1 mx192.emailfiltering.com
Looking for AAAA on mx192.emailfiltering.com
MX 1 mx193.emailfiltering.com
Looking for AAAA on mx193.emailfiltering.com

DNS

Looking for AAAA of NS ns1.nottingham.ac.uk
No AAAA record for ns1.nottingham.ac.uk
Looking for AAAA of NS extdns1.warwick.ac.uk
No AAAA record for extdns1.warwick.ac.uk
Looking for AAAA of NS extdns2.warwick.ac.uk
No AAAA record for extdns2.warwick.ac.uk
Looking for AAAA of NS ns2.nottingham.ac.uk
No AAAA record for ns2.nottingham.ac.uk

NTP

Looking for an A record for ntp.nottingham.ac.uk
Found an A or AAAA record. Now looking for a AAAA.
Cannot find a AAAA record for ntp.nottingham.ac.uk
Cannot find a AAAA record for ntp.ipv6.nottingham.ac.uk

XMPP

Looking for a SRV record for _xmpp-client._tcp.nottingham.ac.uk
Looking for a SRV record for _xmpp-server._tcp.nottingham.ac.uk

Last Updated: Mon May 21 05:01:12 2012 UTC