Check that www.c-span.org 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 c-span.org soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 994
;; flags: qr ra; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; AUTHORITY SECTION:
.			3600000	IN	NS	G.ROOT-SERVERS.NET.
.			3600000	IN	NS	A.ROOT-SERVERS.NET.
.			3600000	IN	NS	E.ROOT-SERVERS.NET.
.			3600000	IN	NS	H.ROOT-SERVERS.NET.
.			3600000	IN	NS	C.ROOT-SERVERS.NET.
.			3600000	IN	NS	I.ROOT-SERVERS.NET.
.			3600000	IN	NS	F.ROOT-SERVERS.NET.
.			3600000	IN	NS	D.ROOT-SERVERS.NET.
.			3600000	IN	NS	J.ROOT-SERVERS.NET.
.			3600000	IN	NS	M.ROOT-SERVERS.NET.
.			3600000	IN	NS	K.ROOT-SERVERS.NET.
.			3600000	IN	NS	L.ROOT-SERVERS.NET.
.			3600000	IN	NS	B.ROOT-SERVERS.NET.

;; ADDITIONAL SECTION:
A.ROOT-SERVERS.NET.	459902	IN	A	198.41.0.4
A.ROOT-SERVERS.NET.	459902	IN	AAAA	2001:503:ba3e::2:30
B.ROOT-SERVERS.NET.	418166	IN	A	192.228.79.201
C.ROOT-SERVERS.NET.	160560	IN	A	192.33.4.12
D.ROOT-SERVERS.NET.	157114	IN	A	128.8.10.90
D.ROOT-SERVERS.NET.	157114	IN	AAAA	2001:500:2d::d
E.ROOT-SERVERS.NET.	415486	IN	A	192.203.230.10
F.ROOT-SERVERS.NET.	460773	IN	A	192.5.5.241
F.ROOT-SERVERS.NET.	156509	IN	AAAA	2001:500:2f::f
G.ROOT-SERVERS.NET.	461437	IN	A	192.112.36.4
H.ROOT-SERVERS.NET.	418475	IN	A	128.63.2.53
H.ROOT-SERVERS.NET.	418475	IN	AAAA	2001:500:1::803f:235
I.ROOT-SERVERS.NET.	460009	IN	A	192.36.148.17
I.ROOT-SERVERS.NET.	460009	IN	AAAA	2001:7fe::53

;; Query time: 20 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri May 18 06:15:02 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1963
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 12

;; QUESTION SECTION:
;c-span.org.			IN	SOA

;; AUTHORITY SECTION:
org.			172800	IN	NS	d0.org.afilias-nst.org.
org.			172800	IN	NS	a0.org.afilias-nst.info.
org.			172800	IN	NS	b0.org.afilias-nst.org.
org.			172800	IN	NS	c0.org.afilias-nst.info.
org.			172800	IN	NS	a2.org.afilias-nst.info.
org.			172800	IN	NS	b2.org.afilias-nst.org.

;; ADDITIONAL SECTION:
a0.org.afilias-nst.info. 172800	IN	A	199.19.56.1
a2.org.afilias-nst.info. 172800	IN	A	199.249.112.1
b0.org.afilias-nst.org.	172800	IN	A	199.19.54.1
b2.org.afilias-nst.org.	172800	IN	A	199.249.120.1
c0.org.afilias-nst.info. 172800	IN	A	199.19.53.1
d0.org.afilias-nst.org.	172800	IN	A	199.19.57.1
a0.org.afilias-nst.info. 172800	IN	AAAA	2001:500:e::1
a2.org.afilias-nst.info. 172800	IN	AAAA	2001:500:40::1
b0.org.afilias-nst.org.	172800	IN	AAAA	2001:500:c::1
b2.org.afilias-nst.org.	172800	IN	AAAA	2001:500:48::1
c0.org.afilias-nst.info. 172800	IN	AAAA	2001:500:b::1
d0.org.afilias-nst.org.	172800	IN	AAAA	2001:500:f::1

;; Query time: 43 msec
;; SERVER: 2001:500:2f::f#53(F.ROOT-SERVERS.NET)
;; WHEN: Fri May 18 06:15:02 2012
;; MSG SIZE  rcvd: 430

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 674
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 0

;; QUESTION SECTION:
;c-span.org.			IN	SOA

;; AUTHORITY SECTION:
c-span.org.		86400	IN	NS	ns67.worldnic.com.
c-span.org.		86400	IN	NS	ns68.worldnic.com.

;; Query time: 305 msec
;; SERVER: 2001:500:f::1#53(d0.org.afilias-nst.org)
;; WHEN: Fri May 18 06:15:02 2012
;; MSG SIZE  rcvd: 78

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1120
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;c-span.org.			IN	SOA

;; ANSWER SECTION:
c-span.org.		7200	IN	SOA	NS67.WORLDNIC.COM. namehost.WORLDNIC.COM. 112042509 10800 3600 604800 3600

;; Query time: 235 msec
;; SERVER: 206.188.198.34#53(ns68.worldnic.com)
;; WHEN: Fri May 18 06:15:03 2012
;; MSG SIZE  rcvd: 90

HTTP

Looking for CNAME of www.c-span.org
Warning: Might be out sourced to a web service.
Checking if there is a AAAA for www.c-span.org ... FAILED.


; <<>> DiG 9.4.1-P1 <<>> www.c-span.org aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1643
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;www.c-span.org.			IN	AAAA

;; ANSWER SECTION:
www.c-span.org.		3600	IN	CNAME	www.c-span.org.edgesuite.net.
www.c-span.org.edgesuite.net. 21600 IN	CNAME	a1621.g.akamai.net.

;; AUTHORITY SECTION:
g.akamai.net.		1000	IN	SOA	n0g.akamai.net. hostmaster.akamai.com. 1337287504 1000 1000 1000 1800

;; Query time: 5 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri May 18 06:15:04 2012
;; MSG SIZE  rcvd: 164

Checking other options ... failed too.

SMTP

MX 10 email.c-span.org
Looking for AAAA on email.c-span.org

DNS

Looking for AAAA of NS ns67.worldnic.com
No AAAA record for ns67.worldnic.com
Looking for AAAA of NS ns68.worldnic.com
No AAAA record for ns68.worldnic.com

NTP

Looking for an A record for ntp.c-span.org
Found an A or AAAA record. Now looking for a AAAA.
Cannot find a AAAA record for ntp.c-span.org
Cannot find a AAAA record for ntp.ipv6.c-span.org

XMPP

Looking for a SRV record for _xmpp-client._tcp.c-span.org
Looking for a SRV record for _xmpp-server._tcp.c-span.org

Last Updated: Thu May 17 20:45:08 2012 UTC