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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.hostduplex.com/centos/5.11/isos/x86_64/
http://mirror.millry.co/CentOS/5.11/isos/x86_64/
http://lug.mtu.edu/centos/5.11/isos/x86_64/
http://mirror.rackspace.com/CentOS/5.11/isos/x86_64/
http://mirror.ancl.hawaii.edu/linux/centos/5.11/isos/x86_64/
http://mirrors.usinternet.com/centos/5.11/isos/x86_64/
http://centos.mirrors.hoobly.com/5.11/isos/x86_64/
http://mirrors.xmission.com/centos/5.11/isos/x86_64/
http://mirrors.umflint.edu/CentOS/5.11/isos/x86_64/
http://centos.hostingxtreme.com/5.11/isos/x86_64/
http://repos.dfw.quadranet.com/centos/5.11/isos/x86_64/
http://mirror.metrocast.net/centos/5.11/isos/x86_64/
http://mirrors.unifiedlayer.com/centos/5.11/isos/x86_64/
http://mirror.us.oneandone.net/linux/distributions/centos/5.11/isos/x86_64/
http://mirrors.maine.edu/CentOS/5.11/isos/x86_64/
http://ftp.osuosl.org/pub/centos/5.11/isos/x86_64/
http://centos.mbni.med.umich.edu/mirror/5.11/isos/x86_64/

Mirrors Verified Sat Aug 1 07:38:11 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