Check that www.dhs.gov 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 dhs.gov soa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1934
;; flags: qr ra; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 14

;; QUESTION SECTION:
;.				IN	NS

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

;; ADDITIONAL SECTION:
A.ROOT-SERVERS.NET.	443814	IN	A	198.41.0.4
A.ROOT-SERVERS.NET.	443814	IN	AAAA	2001:503:ba3e::2:30
B.ROOT-SERVERS.NET.	402078	IN	A	192.228.79.201
C.ROOT-SERVERS.NET.	144472	IN	A	192.33.4.12
D.ROOT-SERVERS.NET.	141026	IN	A	128.8.10.90
D.ROOT-SERVERS.NET.	141026	IN	AAAA	2001:500:2d::d
E.ROOT-SERVERS.NET.	399398	IN	A	192.203.230.10
F.ROOT-SERVERS.NET.	444685	IN	A	192.5.5.241
F.ROOT-SERVERS.NET.	140421	IN	AAAA	2001:500:2f::f
G.ROOT-SERVERS.NET.	445349	IN	A	192.112.36.4
H.ROOT-SERVERS.NET.	402387	IN	A	128.63.2.53
H.ROOT-SERVERS.NET.	402387	IN	AAAA	2001:500:1::803f:235
I.ROOT-SERVERS.NET.	443921	IN	A	192.36.148.17
I.ROOT-SERVERS.NET.	443921	IN	AAAA	2001:7fe::53

;; Query time: 8 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri May 18 10:43:10 2012
;; MSG SIZE  rcvd: 512

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 752
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 3

;; QUESTION SECTION:
;dhs.gov.			IN	SOA

;; AUTHORITY SECTION:
gov.			172800	IN	NS	b.gov-servers.net.
gov.			172800	IN	NS	a.gov-servers.net.

;; ADDITIONAL SECTION:
a.gov-servers.net.	172800	IN	A	69.36.157.30
a.gov-servers.net.	172800	IN	AAAA	2001:500:4431::2:30
b.gov-servers.net.	172800	IN	A	209.112.123.30

;; Query time: 34 msec
;; SERVER: 2001:7fe::53#53(I.ROOT-SERVERS.NET)
;; WHEN: Fri May 18 10:43:10 2012
;; MSG SIZE  rcvd: 132

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1357
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;dhs.gov.			IN	SOA

;; AUTHORITY SECTION:
dhs.gov.		86400	IN	NS	ns3.dhs.gov.
dhs.gov.		86400	IN	NS	ns4.dhs.gov.
dhs.gov.		86400	IN	NS	ns5.dhs.gov.
dhs.gov.		86400	IN	NS	ns6.dhs.gov.

;; ADDITIONAL SECTION:
ns3.dhs.gov.		86400	IN	A	216.81.93.77
ns4.dhs.gov.		86400	IN	A	216.81.93.82
ns5.dhs.gov.		86400	IN	A	216.81.81.35
ns6.dhs.gov.		86400	IN	A	216.81.81.40

;; Query time: 252 msec
;; SERVER: 2001:500:4431::2:30#53(a.gov-servers.net)
;; WHEN: Fri May 18 10:43:10 2012
;; MSG SIZE  rcvd: 161

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1667
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dhs.gov.			IN	SOA

;; ANSWER SECTION:
dhs.gov.		28800	IN	SOA	ns5.dhs.gov. dnssec1net.cbp.dhs.gov. 2008066552 10800 1080 604800 900

;; Query time: 253 msec
;; SERVER: 216.81.81.40#53(ns6.dhs.gov)
;; WHEN: Fri May 18 10:43:11 2012
;; MSG SIZE  rcvd: 80

HTTP

Looking for CNAME of www.dhs.gov
Warning: Might be out sourced to a web service.
Checking if there is a AAAA for www.dhs.gov ... FAILED.


; <<>> DiG 9.4.1-P1 <<>> www.dhs.gov aaaa
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 405
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;www.dhs.gov.			IN	AAAA

;; ANSWER SECTION:
www.dhs.gov.		3599	IN	CNAME	www.dhs.gov.edgekey.net.
www.dhs.gov.edgekey.net. 299	IN	CNAME	e4340.g.akamaiedge.net.

;; AUTHORITY SECTION:
g.akamaiedge.net.	1000	IN	SOA	n0g.akamaiedge.net. hostmaster.akamai.com. 1337303592 1000 1000 1000 1800

;; Query time: 5 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri May 18 10:43:12 2012
;; MSG SIZE  rcvd: 160

Checking other options ... succeeded as ipv6.dhs.gov.
Sending...

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

Reading ...

HTTP/1.1 200 OK
Server: Apache
ETag: "bbba62926e61c9a90ae71e7a2474abd7:1317250075"
Last-Modified: Wed, 28 Sep 2011 22:37:53 GMT
Accept-Ranges: bytes
Content-Length: 6472
Date: Fri, 18 May 2012 01:13:13 GMT
Connection: keep-alive
Content-Type: text/html;charset=utf-8
Content-Type: text/html;charset=utf-8
Content-Type: text/html;charset=utf-8

Accessed / [2001:44b8:60:3:0:0:9665:624f] Response: HTTP/1.1 200 OK

SMTP

MX 10 mail.us.messaging.microsoft.com
Looking for AAAA on mail.us.messaging.microsoft.com

DNS

Looking for AAAA of NS ns3.dhs.gov
No AAAA record for ns3.dhs.gov
Looking for AAAA of NS ns6.dhs.gov
No AAAA record for ns6.dhs.gov
Looking for AAAA of NS ns5.dhs.gov
No AAAA record for ns5.dhs.gov
Looking for AAAA of NS ns4.dhs.gov
No AAAA record for ns4.dhs.gov

NTP

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

XMPP

Looking for a SRV record for _xmpp-client._tcp.dhs.gov
Looking for a SRV record for _xmpp-server._tcp.dhs.gov

Last Updated: Fri May 18 01:13:16 2012 UTC