CentOS 6.4 has been released 9th March 2013. As we know, CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public. It has 100% binary compatibility with its upstream source, Red Hat Enterprise Linux (RHEL).
Released Note :
http://wiki.centos.org/Manuals/ReleaseNotes/CentOS6.4
Download URL for x86 and x64 ISO
http://isoredirect.centos.org/centos/6/isos/i386/
http://isoredirect.centos.org/centos/6/isos/x86_64/
Install Media and sha1sum :
sha1sum i386: 4bd3a1de6f6dfcd7a2199487abf5a9304d696cae CentOS-6.4-i386-bin-DVD1.iso fb096cd6ac88959a287256c76c7292ae2ef53f32 CentOS-6.4-i386-bin-DVD2.iso ddb63a0af2c1d63b8e9b7342c7f52a86b1842689 CentOS-6.4-i386-minimal.iso 6ffc9f3a5f4332b55cc35f1eb3ebb39f5aa8edb6 CentOS-6.4-i386-netinstall.iso sha1sum x86_64: 8672dc087f1b0eda60b9efaa41b82f034f185e24 CentOS-6.4-x86_64-bin-DVD1.iso db16ec15897dcb7a01e7434486075f43ca982c4b CentOS-6.4-x86_64-bin-DVD2.iso 6232efa014d9c6798396b63152c4c9a08b279f5e CentOS-6.4-x86_64-minimal.iso 77817ed6e879da155b6f3dc98e0698e8993e28f8 CentOS-6.4-x86_64-netinstall.iso