Check that www.cuni.cz 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 cuni.cz soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 98
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			25683	IN	NS	i.root-servers.net.
.			25683	IN	NS	e.root-servers.net.
.			25683	IN	NS	b.root-servers.net.
.			25683	IN	NS	m.root-servers.net.
.			25683	IN	NS	c.root-servers.net.
.			25683	IN	NS	d.root-servers.net.
.			25683	IN	NS	k.root-servers.net.
.			25683	IN	NS	h.root-servers.net.
.			25683	IN	NS	a.root-servers.net.
.			25683	IN	NS	l.root-servers.net.
.			25683	IN	NS	j.root-servers.net.
.			25683	IN	NS	f.root-servers.net.
.			25683	IN	NS	g.root-servers.net.

;; ADDITIONAL SECTION:
k.root-servers.net.	515201	IN	A	193.0.14.129
k.root-servers.net.	515201	IN	AAAA	2001:7fd::1
a.root-servers.net.	513675	IN	A	198.41.0.4
a.root-servers.net.	513675	IN	AAAA	2001:503:ba3e::2:30
c.root-servers.net.	214333	IN	A	192.33.4.12
d.root-servers.net.	210887	IN	A	128.8.10.90
d.root-servers.net.	210887	IN	AAAA	2001:500:2d::d
j.root-servers.net.	125945	IN	A	192.58.128.30
j.root-servers.net.	125945	IN	AAAA	2001:503:c27::2:30
b.root-servers.net.	471939	IN	A	192.228.79.201
e.root-servers.net.	469259	IN	A	192.203.230.10
i.root-servers.net.	513782	IN	A	192.36.148.17
i.root-servers.net.	513782	IN	AAAA	2001:7fe::53
f.root-servers.net.	514546	IN	A	192.5.5.241

;; Query time: 7 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu May 17 15:18:49 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1641
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 5, ADDITIONAL: 10

;; QUESTION SECTION:
;cuni.cz.			IN	SOA

;; AUTHORITY SECTION:
cz.			172800	IN	NS	b.ns.nic.cz.
cz.			172800	IN	NS	d.ns.nic.cz.
cz.			172800	IN	NS	c.ns.nic.cz.
cz.			172800	IN	NS	f.ns.nic.cz.
cz.			172800	IN	NS	a.ns.nic.cz.

;; ADDITIONAL SECTION:
a.ns.nic.cz.		172800	IN	A	194.0.12.1
a.ns.nic.cz.		172800	IN	AAAA	2001:678:f::1
b.ns.nic.cz.		172800	IN	A	194.0.13.1
b.ns.nic.cz.		172800	IN	AAAA	2001:678:10::1
c.ns.nic.cz.		172800	IN	A	194.0.14.1
c.ns.nic.cz.		172800	IN	AAAA	2001:678:11::1
d.ns.nic.cz.		172800	IN	A	193.29.206.1
d.ns.nic.cz.		172800	IN	AAAA	2001:678:1::1
f.ns.nic.cz.		172800	IN	A	193.171.255.48
f.ns.nic.cz.		172800	IN	AAAA	2001:628:453:420::48

;; Query time: 134 msec
;; SERVER: 2001:503:ba3e::2:30#53(a.root-servers.net)
;; WHEN: Thu May 17 15:18:49 2012
;; MSG SIZE  rcvd: 332

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 684
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 1

;; QUESTION SECTION:
;cuni.cz.			IN	SOA

;; AUTHORITY SECTION:
cuni.cz.		18000	IN	NS	ns.ces.net.
cuni.cz.		18000	IN	NS	golias.ruk.cuni.cz.

;; ADDITIONAL SECTION:
golias.ruk.cuni.cz.	18000	IN	A	195.113.0.2

;; Query time: 369 msec
;; SERVER: 2001:678:1::1#53(d.ns.nic.cz)
;; WHEN: Thu May 17 15:18:50 2012
;; MSG SIZE  rcvd: 90

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 460
;; flags: qr aa ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3

;; QUESTION SECTION:
;cuni.cz.			IN	SOA

;; ANSWER SECTION:
cuni.cz.		86400	IN	SOA	golias.ruk.cuni.cz. postmaster.dec59.ruk.cuni.cz. 2012041600 28800 7200 604800 86400

;; AUTHORITY SECTION:
cuni.cz.		86400	IN	NS	golias.ruk.cuni.cz.
cuni.cz.		86400	IN	NS	ns.ces.net.

;; ADDITIONAL SECTION:
ns.ces.net.		86400	IN	A	195.113.144.233
ns.ces.net.		86400	IN	AAAA	2001:718:1:101::3
golias.ruk.cuni.cz.	11137	IN	A	195.113.0.2

;; Query time: 357 msec
;; SERVER: 2001:718:1:101::3#53(ns.ces.net)
;; WHEN: Thu May 17 15:18:52 2012
;; MSG SIZE  rcvd: 187

HTTP

Looking for CNAME of www.cuni.cz
Checking if there is a AAAA for www.cuni.cz ... success.
Sending...

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

Reading ...

HTTP/1.1 200 OK
Date: Thu, 17 May 2012 05:48:54 GMT
Server: Apache/2.2.3 (CentOS)
X-Powered-By: PHP/5.1.6
Connection: close
Content-Type: text/html

Accessed / [2001:718:1e03:622:0:0:0:12] Response: HTTP/1.1 200 OK

SMTP

MX 10 dec59.ruk.cuni.cz
Looking for AAAA on dec59.ruk.cuni.cz
MX 10 golias.ruk.cuni.cz
Looking for AAAA on golias.ruk.cuni.cz

DNS

Looking for AAAA of NS golias.ruk.cuni.cz
No AAAA record for golias.ruk.cuni.cz
Looking for AAAA of NS ns.ces.net
Querying 2001:718:1:101:0:0:0:3 for SOA of cuni.cz over IPv6 ... successful!

NTP

Looking for an A record for ntp.cuni.cz
Looking for an A record for clock.cuni.cz
Looking for an A record for time.cuni.cz
Looking for an A record for chime.cuni.cz

XMPP

Looking for a SRV record for _xmpp-client._tcp.cuni.cz
Looking for a SRV record for _xmpp-server._tcp.cuni.cz

Last Updated: Thu May 17 05:48:58 2012 UTC