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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.fileplanet.com/centos/5.11/isos/x86_64/
http://mirror.cs.uwp.edu/pub/centos/5.11/isos/x86_64/
http://mirror.atlantic.net/centos/5.11/isos/x86_64/
http://repos.forethought.net/centos/5.11/isos/x86_64/
http://mirrors.advancedhosters.com/centos/5.11/isos/x86_64/
http://mirrors.cmich.edu/centos/5.11/isos/x86_64/
http://mirror.chpc.utah.edu/pub/centos/5.11/isos/x86_64/
http://mirrors.xmission.com/centos/5.11/isos/x86_64/
http://mirror.jax.hugeserver.com/centos/5.11/isos/x86_64/
http://repo1.sea.innoscale.net/centos/5.11/isos/x86_64/
http://mirrors.greenmountainaccess.net/centos/5.11/isos/x86_64/
http://mirror.sanctuaryhost.com/centos/5.11/isos/x86_64/
http://repos.dfw.quadranet.com/centos/5.11/isos/x86_64/
http://linux.cc.lehigh.edu/centos/5.11/isos/x86_64/
http://mirrors.tummy.com/mirrors/CentOS/5.11/isos/x86_64/
http://chicago.gaminghost.co/5.11/isos/x86_64/
http://repo1.dal.innoscale.net/centos/5.11/isos/x86_64/

Mirrors Verified Mon Feb 20 15:02:44 2017 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