It shows on the error pages as the server signature, try going to:
http://www.yoursite.tld/this/url/should/never/work.php (I'm well aware it doesn't exist, we're looking for the signature on the error page at the bottom of the page).

It should put something similar to:
Quote
Apache/2.0.52 (CentOS) Server at www.lawofmen.com Port 80

If you have custom error pages setup this method won't work, in this case you'll want to access a phpinfo page and look at the "SERVER_SIGNATURE" line:
phpinfo.php:
Code
<?php phpinfo(); ?>

You should see something similar to:
Code
<address>Apache/2.0.52 (CentOS) Server at www.undergroundnews.com Port 443</address>

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