You will typically see:

If your organization still uses RHEL 4, you may have an old entitlements contract. Log into the Red Hat Customer Portal . Navigate to Downloads → Red Hat Enterprise Linux → version 4. You can find ISO images for:

RHEL 4 had 9 major updates (Update 1 through Update 9). Update 9 (March 2011) is the final and most stable release. Always aim for if possible, as it includes:

Red Hat Enterprise Linux 4 (codenamed Nahant ) was originally released in February 2005. It introduced key features such as support for SATA drives, improved virtualization via Xen (in Update 6), and native POSIX capabilities.