Use the "Version" dropdown menu to find 6.5 .
If your company uses Red Hat Satellite 5.6 or 6.x, you can sync the RHEL 6.5 repositories to your local Satellite server and then ISO download or PXE boot from there. This is the enterprise-standard method for air-gapped networks. rhel 6.5 iso download
Visit the Red Hat Software & Download Center. You will need an active Red Hat account. Select the Product: Click on Red Hat Enterprise Linux . Use the "Version" dropdown menu to find 6