title: Where to find packages names and versions for RedHat?
body: <p>How can I find out whether a specific RedHat release (RHEL4, RHEL5...) contains a certain package (or a certain version of a package)? For Debian and Ubuntu, there's packages.debian.org and packages.ubuntu.com; is there a similar web site for RedHat?</p>
  
  <p>Note: I don't want to have to install all the releases just to check some package version :-)</p>