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In order to conserve the limited bandwidth available .iso images are not downloadable from mirror.centos.org

The following mirrors should have the ISO images available:

http://mirror.eboundhost.com/CentOS/5.11/isos/x86_64/
http://mirrors.usinternet.com/centos/5.11/isos/x86_64/
http://mirrors.mit.edu/centos/5.11/isos/x86_64/
http://mirrors.arsc.edu/centos/5.11/isos/x86_64/
http://reflector.westga.edu/repos/CentOS/5.11/isos/x86_64/
http://mirror.redsox.cc/centos/5.11/isos/x86_64/
http://mirror.tzulo.com/centos/5.11/isos/x86_64/
http://mirror.netdepot.com/centos/5.11/isos/x86_64/
http://centos-distro.1gservers.com/5.11/isos/x86_64/
http://mirror.atlantic.net/centos/5.11/isos/x86_64/
http://mirror.stjschools.org/public/centos/5.11/isos/x86_64/
http://mirror.keystealth.org/centos/5.11/isos/x86_64/
http://mirror.math.princeton.edu/pub/centos/5.11/isos/x86_64/
http://mirror.confluxtech.com/centos/5.11/isos/x86_64/
http://mirror.sjc02.svwh.net/centos/5.11/isos/x86_64/
http://mirrors.cmich.edu/centos/5.11/isos/x86_64/
http://mirror.sanctuaryhost.com/centos/5.11/isos/x86_64/

Mirrors Verified Thu Dec 8 21:05:43 2016 UTC

Or use bittorrent to download the .torrent files provided.

Bittorrent is a peer to peer download system described at http://bittorrent.com/ and there are many clients available.

These include (in no particular order of preference): utorrent, vuze (Azureus), BitTorrent, Deluge, ctorrent, ktorrent, rtorrent and transmission.

Packaged copies of various torrent clients for CentOS can be found in the repositories listed in the following wiki article : http://wiki.centos.org/AdditionalResources/Repositories