IDServe worked for me.  This isn't "clearly" z/OS but one can infer.
This is what I got back from our own book server which is hosted on Z.

HTTP/1.1 200 Document follows 
Server: IBM HTTP Server/V5R3M0
Date: Mon, 04 Aug 2008 15:53:29 GMT
Connection: close
Accept-Ranges: bytes
Content-Location: home.html
Content-Type: text/html
Content-Length: 3061
Last-Modified: Fri, 27 Jun 2008 14:59:09 GMT
Query complete.

Server identified itself as: IBM HTTP Server/V5R3M0

Gary Diehl
Systems Administration

"The truth leaves no room for feelings of superiority.  Such feelings
are nothing but lying vanities." - James L. Ferrell
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Jeff Beech-Garwood
Sent: Monday, August 04, 2008 9:41 AM
To: [email protected]
Subject: Re: Can I tell whether a site is Linux on z

You can try running Steve Gibson's IDSERVE from 
http://www.grc.com/id/idserve.htm. It interrogates and displays the http

headers from the webserver.

Jeff Beech-Garwood
Systems Programmer
Mainframe Network Support
US Bank, EP-MN-02NS
651-962-3809



Clark F Morris <[EMAIL PROTECTED]> 
Sent by: IBM Mainframe Discussion List <[email protected]>
08/03/2008 05:25 PM
Please respond to
IBM Mainframe Discussion List <[email protected]>


To
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cc

Subject
Can I tell whether a site is Linux on z






Is there a way I can tell if http://bahn.hafas.de is Linux on z.  If
it is that says interesting things about whether z series might be
able to handle google.  The site does timetable lookup, trip planning,
etc. and apparently is among the best for planning European trips.

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