[vox-tech] comcast broadband DNS

[Jeff Newmiller]

On Mon, 5 Apr 2004, dylan wrote:

> hi everyone:
> 
> here is a question that has bugged me continuously....

Even during dinner? Sounds like a telemarketer...

> how does one go about getting the DNS entries for comcast braodband...?

"DNS entries" is a bit vague... depending on what you are really after,
some possibilities are:

1) ping comcast.com
   This will print out an IP address (obtained via dns lookup) as a
byproduct of preparing to send it packets.

2) look in the header of your own email:
Received: from [192.168.10.2] (adsl-64-168-12-152.dsl.scrm01.pacbell.net
        [64.168.12.152]) by pimout1-ext.prodigy.net (8.12.10/8.12.10) with
        ESMTP id i365UkuO190390 for <vox-tech@lists.lugod.org>; Tue, 6
        Apr 2004 01:30:51 -0400
User-Agent: Microsoft-Outlook-Express-Macintosh-Edition/5.0.6
From: dylan <dylan@iici.no-ip.org>
To: <vox-tech@lists.lugod.org>
Message-ID: <BC97911D.C3BA%dylan@iici.no-ip.org>
Mime-version: 1.0
X-Space-Robots: We are here to protect you from the terrible secret of
Content-type: text/plain; charset="US-ASCII"
Content-transfer-encoding: 7bit
Subject: [vox-tech] comcast broadband DNS

where you find the equivalence
  adsl-64-168-12-152.dsl.scrm01.pacbell.net = 64.168.12.152
which is the address from which you sent your email.

3) visit http://www.samspade.org and stuff a dns name or ip address into
the "Do Stuff" field and push the button.

4) use nslookup
$ nslookup
> comcast.com
Server:         192.168.3.251
Address:        192.168.3.251#53

Non-authoritative answer:
Name:   comcast.com
> 64.168.12.152
Server:         192.168.3.251
Address:        192.168.3.251#53

152.12.168.64.in-addr.arpa name = adsl-64-168-12-152.dsl.scrm01.pacbell.net.
> 

5) use dig
$ dig -x 64.168.12.152
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32176
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;152.12.168.64.in-addr.arpa.    IN      PTR

;; ANSWER SECTION:
152.12.168.64.in-addr.arpa. 172661 IN   PTR
 adsl-64-168-12-152.dsl.scrm01.pacbell.net.

;; Query time: 1 msec
;; SERVER: 192.168.3.251#53(192.168.3.251)
;; WHEN: Tue Apr  6 00:47:26 2004
;; MSG SIZE  rcvd: 99

Note that there doesn't seem to be a valid reverse lookup for
the comcast.net ip address.

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