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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.mirror.lstn.net/5.11/isos/x86_64/
http://mirror.chpc.utah.edu/pub/centos/5.11/isos/x86_64/
http://mirror.sesp.northwestern.edu/centos/5.11/isos/x86_64/
http://mirror.us.oneandone.net/linux/distributions/centos/5.11/isos/x86_64/
http://mirrors.adams.net/centos/5.11/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/5.11/isos/x86_64/
http://mirrors.syringanetworks.net/centos/5.11/isos/x86_64/
http://mirror.keystealth.org/centos/5.11/isos/x86_64/
http://mirror.solarvps.com/centos/5.11/isos/x86_64/
http://repos.dfw.quadranet.com/centos/5.11/isos/x86_64/
http://mirrors.tripadvisor.com/centos/5.11/isos/x86_64/
http://mirror.rackspace.com/CentOS/5.11/isos/x86_64/
http://mirror.vcu.edu/pub/gnu+linux/centos/5.11/isos/x86_64/
http://mirrors.sonic.net/centos/5.11/isos/x86_64/
http://mirror.oss.ou.edu/centos/5.11/isos/x86_64/
http://mirrors.usc.edu/pub/linux/distributions/centos/5.11/isos/x86_64/
http://mirror.millry.co/CentOS/5.11/isos/x86_64/

Mirrors Verified Thu Sep 3 12:40:53 2015 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