Check that www.uclouvain.be 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 uclouvain.be soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 336
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			216484	IN	NS	l.root-servers.net.
.			216484	IN	NS	a.root-servers.net.
.			216484	IN	NS	g.root-servers.net.
.			216484	IN	NS	i.root-servers.net.
.			216484	IN	NS	m.root-servers.net.
.			216484	IN	NS	c.root-servers.net.
.			216484	IN	NS	h.root-servers.net.
.			216484	IN	NS	k.root-servers.net.
.			216484	IN	NS	b.root-servers.net.
.			216484	IN	NS	f.root-servers.net.
.			216484	IN	NS	d.root-servers.net.
.			216484	IN	NS	j.root-servers.net.
.			216484	IN	NS	e.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	85807	IN	A	198.41.0.4
a.root-servers.net.	85807	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	44071	IN	A	192.228.79.201
c.root-servers.net.	431855	IN	A	192.33.4.12
d.root-servers.net.	390204	IN	A	128.8.10.90
d.root-servers.net.	390204	IN	AAAA	2001:500:2d::d
e.root-servers.net.	41391	IN	A	192.203.230.10
f.root-servers.net.	86678	IN	A	192.5.5.241
f.root-servers.net.	391554	IN	AAAA	2001:500:2f::f
g.root-servers.net.	87342	IN	A	192.112.36.4
h.root-servers.net.	44380	IN	A	128.63.2.53
h.root-servers.net.	44380	IN	AAAA	2001:500:1::803f:235
i.root-servers.net.	85914	IN	A	192.36.148.17
i.root-servers.net.	85914	IN	AAAA	2001:7fe::53

;; Query time: 98 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue May 22 14:09:57 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 270
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 8

;; QUESTION SECTION:
;uclouvain.be.			IN	SOA

;; AUTHORITY SECTION:
be.			172800	IN	NS	london.ns.dns.be.
be.			172800	IN	NS	x.dns.be.
be.			172800	IN	NS	amsterdam.ns.dns.be.
be.			172800	IN	NS	prague.ns.dns.be.
be.			172800	IN	NS	m.ns.dns.be.
be.			172800	IN	NS	brussels.ns.dns.be.

;; ADDITIONAL SECTION:
m.ns.dns.be.		172800	IN	A	194.0.6.1
x.dns.be.		172800	IN	A	194.0.1.10
london.ns.dns.be.	172800	IN	A	195.66.241.90
prague.ns.dns.be.	172800	IN	A	195.47.235.138
brussels.ns.dns.be.	172800	IN	A	193.190.135.4
amsterdam.ns.dns.be.	172800	IN	A	91.200.16.101
x.dns.be.		172800	IN	AAAA	2001:678:4::a
brussels.ns.dns.be.	172800	IN	AAAA	2001:6a8:3c60::be

;; Query time: 249 msec
;; SERVER: 2001:500:2d::d#53(d.root-servers.net)
;; WHEN: Tue May 22 14:09:57 2012
;; MSG SIZE  rcvd: 310

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 598
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 0

;; QUESTION SECTION:
;uclouvain.be.			IN	SOA

;; AUTHORITY SECTION:
uclouvain.be.		86400	IN	NS	ns2.sri.ucl.ac.be.
uclouvain.be.		86400	IN	NS	ns3.sri.ucl.ac.be.
uclouvain.be.		86400	IN	NS	ns6.ucl.ac.be.
uclouvain.be.		86400	IN	NS	ns1.sri.ucl.ac.be.

;; Query time: 286 msec
;; SERVER: 195.66.241.90#53(london.ns.dns.be)
;; WHEN: Tue May 22 14:09:57 2012
;; MSG SIZE  rcvd: 113

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1187
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;uclouvain.be.			IN	SOA

;; ANSWER SECTION:
uclouvain.be.		604800	IN	SOA	ns1.sri.ucl.ac.be. fontaine.sri.ucl.ac.be. 2012041900 7200 900 3600000 10800

;; AUTHORITY SECTION:
uclouvain.be.		604800	IN	NS	ns6.ucl.ac.be.
uclouvain.be.		604800	IN	NS	ns1.sri.ucl.ac.be.
uclouvain.be.		604800	IN	NS	ns2.sri.ucl.ac.be.
uclouvain.be.		604800	IN	NS	ns3.sri.ucl.ac.be.

;; ADDITIONAL SECTION:
ns1.sri.ucl.ac.be.	604800	IN	A	130.104.1.1
ns2.sri.ucl.ac.be.	604800	IN	A	130.104.1.2
ns3.sri.ucl.ac.be.	604800	IN	A	130.104.254.1
ns6.ucl.ac.be.		86400	IN	AAAA	2001:6a8:3080:1::3

;; Query time: 333 msec
;; SERVER: 130.104.254.1#53(ns3.sri.ucl.ac.be)
;; WHEN: Tue May 22 14:09:58 2012
;; MSG SIZE  rcvd: 234

HTTP

Looking for CNAME of www.uclouvain.be
Checking if there is a AAAA for www.uclouvain.be ... success.
Sending...

HEAD / HTTP/1.1
Host: www.uclouvain.be
User-Agent: ipv6-survey.pl/1.97 http://www.mrp.net/IPv6_Survey.html

Reading ...

HTTP/1.1 200 OK
Date: Tue, 22 May 2012 04:39:58 GMT
Server: Apache/2.2.3 (CentOS)
Set-Cookie: JSESSIONID=C212943FEFD2C780D155FACCBAD46BBD; Path=/cps
Set-Cookie: CPSSESSIONID_ucl=SID-5C3CA648-F63B7265; Path=/
Expires: Tue, 22 May 2012 04:39:58 GMT
lsrequestid: 263649677
Cache-Control: no-cache
Pragma: no-cache
Content-Type: text/html;charset=UTF-8

Accessed / [2001:6a8:3080:9:0:0:0:100] Response: HTTP/1.1 200 OK

SMTP

MX 10 smtp.sgsi.ucl.ac.be
Looking for AAAA on smtp.sgsi.ucl.ac.be
Connecting to 2001:6a8:3080:9:0:0:0:67 ... done.
220 smtp5.sgsi.ucl.ac.be ESMTP
250-smtp5.sgsi.ucl.ac.be
250-PIPELINING
250-SIZE 250000000
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN

DNS

Looking for AAAA of NS ns6.ucl.ac.be
Querying 2001:6a8:3080:1:0:0:0:3 for SOA of uclouvain.be over IPv6 ... successful!
Looking for AAAA of NS ns2.sri.ucl.ac.be
No AAAA record for ns2.sri.ucl.ac.be
Looking for AAAA of NS ns3.sri.ucl.ac.be
No AAAA record for ns3.sri.ucl.ac.be
Looking for AAAA of NS ns1.sri.ucl.ac.be
No AAAA record for ns1.sri.ucl.ac.be

NTP

Looking for an A record for ntp.uclouvain.be
Looking for an A record for clock.uclouvain.be
Looking for an A record for time.uclouvain.be
Looking for an A record for chime.uclouvain.be

XMPP

Looking for a SRV record for _xmpp-client._tcp.uclouvain.be
Looking for a SRV record for _xmpp-server._tcp.uclouvain.be

Last Updated: Tue May 22 04:40:03 2012 UTC