As you probably have noticed, I am now also including headers in the lookups
to aid your learning and ease my job.

Return-Path: <Mzxyteq@ibm.net>
Received: from out1.ibm.net (out1.ibm.net [165.87.194.252])	
by tomcat.ns.net (8.8.5/8.8.5) with ESMTP id TAA19449	for <cpicket@ns.net>; 
Mon, 15 Sep 1997 19:54:39 -0700 (PDT)
From: Mzxyteq@ibm.net
Received: from ibm.net (slip166-72-77-202.ga.us.ibm.net [166.72.77.202]) 
by out1.ibm.net (8.8.5/8.6.9) with SMTP id CAA84198; Tue, 16 Sep 1997 02:52:55 GMT
Date: Tue, 16 Sep 1997 02:52:55 GMT
Message-Id: <199709160252.CAA84198@out1.ibm.net>
To: Mzxyteq@ibm.net
Subject: "Free" Gift!
X-UIDL: 881a6c8e2e8b9b9b7028c6a1063f16ea

First, I'll do "whois" lookups as far as that will take me, then go into IP/DNS
resolves.

>whois ibm.net
IBM Corporation (IBM2-DOM)
   Old Orchard Rd.
   Armonk, NY 10504
   USA

   Domain Name: IBM.NET

   Administrative Contact:
      Trio, Nicholas R  (NRT1)  nrt@WATSON.IBM.COM
      (914) 945-1850
   Technical Contact, Zone Contact:
      Administrator, Dns M.  (RMB7)  DNS@IMS.ADVANTIS.COM
      800-566-0056 (FAX) 914-899-4555

   Record last updated on 07-Nov-96.
   Record created on 12-Aug-94.
   Database last updated on 15-Sep-97 04:41:03 EDT.

   Domain servers in listed order:

   NS01.NY.US.IBM.NET           165.87.194.244
   NS02.CA.US.IBM.NET           165.87.201.243

I know for a fact that IBM and Advantis are tied together, not in spam, but in
other real and legitimate business.

>whois advantis.com
Advantis (ADVANTIS-DOM)
   3101 West Dr Martin Luther King, Jr Blvd
   Tampa, FL 33607

   Domain Name: ADVANTIS.COM

   Administrative Contact:
      Parries, Phil  (PP481)  parries@GEMINI.IBM.COM
      813-878-3426
   Technical Contact, Zone Contact:
      Administrator, Dns  (DA694)  DNS@IMS.ADVANTIS.COM
      800-566-0056 (FAX) 914-899-4555
   Billing Contact:
      Chan, Alex  (AC1198)  ALEXC@VNET.IBM.COM
      847-240-8784

   Record last updated on 05-Jun-97.
   Record created on 11-Jan-93.
   Database last updated on 15-Sep-97 04:41:03 EDT.

   Domain servers in listed order:

   NS02.CA.US.IBM.NET           165.87.201.243
   NS01.CA.US.IBM.NET           165.87.201.244
   NS01.NY.US.IBM.NET           165.87.194.244
   NS.ADVANTIS.COM              198.133.29.90


OK, time to verify IP addresses.
This one resolves:
out1.ibm.net [165.87.194.252]

As does this address:
slip166-72-77-202.ga.us.ibm.net [166.72.77.202]

All done.