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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.scalabledns.com/centos/5.11/isos/x86_64/
http://mirrors.sonic.net/centos/5.11/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/5.11/isos/x86_64/
http://centos.sonn.com/5.11/isos/x86_64/
http://mirror.rackspace.com/CentOS/5.11/isos/x86_64/
http://mirror.hostduplex.com/centos/5.11/isos/x86_64/
http://mirrors.rit.edu/centos/5.11/isos/x86_64/
http://mirror.confluxtech.com/centos/5.11/isos/x86_64/
http://mirror.metrocast.net/centos/5.11/isos/x86_64/
http://mirrors.tripadvisor.com/centos/5.11/isos/x86_64/
http://mirrors.centos.webair.com/centos/5.11/isos/x86_64/
http://repo1.dal.innoscale.net/centos/5.11/isos/x86_64/
http://mirror.umd.edu/centos/5.11/isos/x86_64/
http://mirror.trouble-free.net/centos/5.11/isos/x86_64/
http://mirror.us.leaseweb.net/centos/5.11/isos/x86_64/
http://repo.dimenoc.com/pub/centos/5.11/isos/x86_64/
http://yum.tamu.edu/centos/5.11/isos/x86_64/

Mirrors Verified Sat Jul 23 14:16:44 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