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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://centos.mirrors.hoobly.com/5.11/isos/x86_64/
http://ftpmirror.your.org/pub/centos/5.11/isos/x86_64/
http://mirror.fdcservers.net/centos/5.11/isos/x86_64/
http://linux.mirrors.es.net/centos/5.11/isos/x86_64/
http://mirror.scalabledns.com/centos/5.11/isos/x86_64/
http://mirror.beyondhosting.net/CentOS/5.11/isos/x86_64/
http://mirror.rackspace.com/CentOS/5.11/isos/x86_64/
http://mirrors.arsc.edu/centos/5.11/isos/x86_64/
http://chicago.gaminghost.co/5.11/isos/x86_64/
http://mirrors.seas.harvard.edu/centos/5.11/isos/x86_64/
http://mirrors.kernel.org/centos/5.11/isos/x86_64/
http://centos.mirror.constant.com/5.11/isos/x86_64/
http://mirrors.adams.net/centos/5.11/isos/x86_64/
http://centos.hostingxtreme.com/5.11/isos/x86_64/
http://bay.uchicago.edu/centos/5.11/isos/x86_64/
http://mirror.metrocast.net/centos/5.11/isos/x86_64/
http://mirror.oss.ou.edu/centos/5.11/isos/x86_64/

Mirrors Verified Wed May 4 20:46:46 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