Check that www.corenap.com 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 corenap.com soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1405
;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			19475	IN	NS	k.root-servers.net.
.			19475	IN	NS	i.root-servers.net.
.			19475	IN	NS	m.root-servers.net.
.			19475	IN	NS	h.root-servers.net.
.			19475	IN	NS	j.root-servers.net.
.			19475	IN	NS	f.root-servers.net.
.			19475	IN	NS	g.root-servers.net.
.			19475	IN	NS	c.root-servers.net.
.			19475	IN	NS	l.root-servers.net.
.			19475	IN	NS	d.root-servers.net.
.			19475	IN	NS	a.root-servers.net.
.			19475	IN	NS	e.root-servers.net.
.			19475	IN	NS	b.root-servers.net.

;; ADDITIONAL SECTION:
k.root-servers.net.	508993	IN	A	193.0.14.129
k.root-servers.net.	508993	IN	AAAA	2001:7fd::1
a.root-servers.net.	507467	IN	A	198.41.0.4
a.root-servers.net.	507467	IN	AAAA	2001:503:ba3e::2:30
c.root-servers.net.	208125	IN	A	192.33.4.12
d.root-servers.net.	204679	IN	A	128.8.10.90
d.root-servers.net.	204679	IN	AAAA	2001:500:2d::d
j.root-servers.net.	119737	IN	A	192.58.128.30
j.root-servers.net.	119737	IN	AAAA	2001:503:c27::2:30
b.root-servers.net.	465731	IN	A	192.228.79.201
e.root-servers.net.	463051	IN	A	192.203.230.10
i.root-servers.net.	507574	IN	A	192.36.148.17
i.root-servers.net.	507574	IN	AAAA	2001:7fe::53
f.root-servers.net.	508338	IN	A	192.5.5.241

;; Query time: 8 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu May 17 17:02:17 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 83
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 14

;; QUESTION SECTION:
;corenap.com.			IN	SOA

;; AUTHORITY SECTION:
com.			172800	IN	NS	a.gtld-servers.net.
com.			172800	IN	NS	b.gtld-servers.net.
com.			172800	IN	NS	c.gtld-servers.net.
com.			172800	IN	NS	d.gtld-servers.net.
com.			172800	IN	NS	e.gtld-servers.net.
com.			172800	IN	NS	f.gtld-servers.net.
com.			172800	IN	NS	g.gtld-servers.net.
com.			172800	IN	NS	h.gtld-servers.net.
com.			172800	IN	NS	i.gtld-servers.net.
com.			172800	IN	NS	j.gtld-servers.net.
com.			172800	IN	NS	k.gtld-servers.net.
com.			172800	IN	NS	l.gtld-servers.net.
com.			172800	IN	NS	m.gtld-servers.net.

;; ADDITIONAL SECTION:
a.gtld-servers.net.	172800	IN	A	192.5.6.30
b.gtld-servers.net.	172800	IN	A	192.33.14.30
c.gtld-servers.net.	172800	IN	A	192.26.92.30
d.gtld-servers.net.	172800	IN	A	192.31.80.30
e.gtld-servers.net.	172800	IN	A	192.12.94.30
f.gtld-servers.net.	172800	IN	A	192.35.51.30
g.gtld-servers.net.	172800	IN	A	192.42.93.30
h.gtld-servers.net.	172800	IN	A	192.54.112.30
i.gtld-servers.net.	172800	IN	A	192.43.172.30
j.gtld-servers.net.	172800	IN	A	192.48.79.30
k.gtld-servers.net.	172800	IN	A	192.52.178.30
l.gtld-servers.net.	172800	IN	A	192.41.162.30
m.gtld-servers.net.	172800	IN	A	192.55.83.30
a.gtld-servers.net.	172800	IN	AAAA	2001:503:a83e::2:30

;; Query time: 25 msec
;; SERVER: 2001:500:3::42#53(l.root-servers.net)
;; WHEN: Thu May 17 17:02:17 2012
;; MSG SIZE  rcvd: 489

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1756
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 3, ADDITIONAL: 3

;; QUESTION SECTION:
;corenap.com.			IN	SOA

;; AUTHORITY SECTION:
corenap.com.		172800	IN	NS	ns1.corenap.com.
corenap.com.		172800	IN	NS	ns2.corenap.com.
corenap.com.		172800	IN	NS	ns10.corenap.com.

;; ADDITIONAL SECTION:
ns1.corenap.com.	172800	IN	A	198.252.182.5
ns2.corenap.com.	172800	IN	A	198.252.182.21
ns10.corenap.com.	172800	IN	A	64.20.224.18

;; Query time: 255 msec
;; SERVER: 192.26.92.30#53(c.gtld-servers.net)
;; WHEN: Thu May 17 17:02:17 2012
;; MSG SIZE  rcvd: 132

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 957
;; flags: qr aa ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3

;; QUESTION SECTION:
;corenap.com.			IN	SOA

;; ANSWER SECTION:
corenap.com.		600	IN	SOA	ns1.corenap.com. hostmaster.corenap.com. 2012043002 3600 3600 604800 600

;; AUTHORITY SECTION:
corenap.com.		600	IN	NS	ns10.corenap.com.
corenap.com.		600	IN	NS	ns1.corenap.com.
corenap.com.		600	IN	NS	ns2.corenap.com.

;; ADDITIONAL SECTION:
ns1.corenap.com.	600	IN	A	198.252.182.5
ns2.corenap.com.	600	IN	A	198.252.182.21
ns10.corenap.com.	600	IN	A	64.20.224.18

;; Query time: 224 msec
;; SERVER: 64.20.224.18#53(ns10.corenap.com)
;; WHEN: Thu May 17 17:02:18 2012
;; MSG SIZE  rcvd: 179

HTTP

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


; <<>> DiG 9.4.1-P1 <<>> www.corenap.com aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 77
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;www.corenap.com.		IN	AAAA

;; ANSWER SECTION:
www.corenap.com.	599	IN	CNAME	www4.corenap.com.

;; AUTHORITY SECTION:
corenap.com.		600	IN	SOA	ns1.corenap.com. hostmaster.corenap.com. 2012043002 3600 3600 604800 600

;; Query time: 5 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu May 17 17:02:19 2012
;; MSG SIZE  rcvd: 103

Checking other options ... failed too.

SMTP

MX 10 cleaner21.mail.corenap.com
Looking for AAAA on cleaner21.mail.corenap.com
MX 10 cleaner20.mail.corenap.com
Looking for AAAA on cleaner20.mail.corenap.com

DNS

Looking for AAAA of NS ns2.corenap.com
No AAAA record for ns2.corenap.com
Looking for AAAA of NS ns1.corenap.com
No AAAA record for ns1.corenap.com
Looking for AAAA of NS ns10.corenap.com
No AAAA record for ns10.corenap.com

NTP

Looking for an A record for ntp.corenap.com
Found an A or AAAA record. Now looking for a AAAA.
Cannot find a AAAA record for ntp.corenap.com
Cannot find a AAAA record for ntp.ipv6.corenap.com

XMPP

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

Last Updated: Thu May 17 07:32:22 2012 UTC