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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.math.princeton.edu/pub/centos/5.11/isos/x86_64/
http://mirror.net.cen.ct.gov/centos/5.11/isos/x86_64/
http://mirror.trouble-free.net/centos/5.11/isos/x86_64/
http://centos.mirrors.wvstateu.edu/5.11/isos/x86_64/
http://repo1.dal.innoscale.net/centos/5.11/isos/x86_64/
http://mirror.eboundhost.com/CentOS/5.11/isos/x86_64/
http://repo1.sea.innoscale.net/centos/5.11/isos/x86_64/
http://mirror.pac-12.org/5.11/isos/x86_64/
http://denver.gaminghost.co/5.11/isos/x86_64/
http://mirrors.tripadvisor.com/centos/5.11/isos/x86_64/
http://centos.mirror.lstn.net/5.11/isos/x86_64/
http://mirror.millry.co/CentOS/5.11/isos/x86_64/
http://mirror.confluxtech.com/centos/5.11/isos/x86_64/
http://mirror.scalabledns.com/centos/5.11/isos/x86_64/
http://mirror.hmc.edu/centos/5.11/isos/x86_64/
http://mirror.cisp.com/CentOS/5.11/isos/x86_64/
http://mirror.jaleco.com/centos/5.11/isos/x86_64/

Mirrors Verified Sat Oct 1 20:03:58 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