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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://ftpmirror.your.org/pub/centos/5.11/isos/x86_64/
http://centos.mirrors.tds.net/pub/linux/centos/5.11/isos/x86_64/
http://centos.sonn.com/5.11/isos/x86_64/
http://mirror.trouble-free.net/centos/5.11/isos/x86_64/
http://repo1.sea.innoscale.net/centos/5.11/isos/x86_64/
http://mirror.compevo.com/centos/5.11/isos/x86_64/
http://mirror.es.its.nyu.edu/centos/5.11/isos/x86_64/
http://centos.eecs.wsu.edu/5.11/isos/x86_64/
http://mirrors.umflint.edu/CentOS/5.11/isos/x86_64/
http://mirrors.cat.pdx.edu/centos/5.11/isos/x86_64/
http://mirror.teklinks.com/centos/5.11/isos/x86_64/
http://centos.gbeservers.com/5.11/isos/x86_64/
http://mirror.confluxtech.com/centos/5.11/isos/x86_64/
http://centos.mia.host-engine.com/5.11/isos/x86_64/
http://pubmirrors.dal.corespace.com/centos/5.11/isos/x86_64/
http://mirror.supremebytes.com/centos/5.11/isos/x86_64/
http://mirror.cs.pitt.edu/centos/5.11/isos/x86_64/

Mirrors Verified Sat Jan 21 20:49:53 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