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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.nac.net/5.11/isos/x86_64/
http://mirrors.advancedhosters.com/centos/5.11/isos/x86_64/
http://mirror.ash.fastserv.com/pub/linux/centos/5.11/isos/x86_64/
http://mirrors.umflint.edu/CentOS/5.11/isos/x86_64/
http://mirror.trouble-free.net/centos/5.11/isos/x86_64/
http://mirror.clarkson.edu/centos/5.11/isos/x86_64/
http://centos.eecs.wsu.edu/5.11/isos/x86_64/
http://mirror-centos.hostingswift.com/centos/5.11/isos/x86_64/
http://mirror.pac-12.org/5.11/isos/x86_64/
http://mirrors.arsc.edu/centos/5.11/isos/x86_64/
http://mirror.team-cymru.org/CentOS/5.11/isos/x86_64/
http://repos.dfw.quadranet.com/centos/5.11/isos/x86_64/
http://mirror.us.oneandone.net/linux/distributions/centos/5.11/isos/x86_64/
http://centos.expedientevirtual.com/5.11/isos/x86_64/
ftp://ftp.ussg.iu.edu/linux/centos/5.11/isos/x86_64/
http://mirrors.centarra.com/centos/5.11/isos/x86_64/
http://mirrors.mit.edu/centos/5.11/isos/x86_64/

Mirrors Verified Thu Feb 5 14:03:30 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