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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://mirrors.arsc.edu/centos/5.11/isos/x86_64/
http://mirror.fdcservers.net/centos/5.11/isos/x86_64/
http://mirrors.unifiedlayer.com/centos/5.11/isos/x86_64/
http://reflector.westga.edu/repos/CentOS/5.11/isos/x86_64/
http://centos.mirror.constant.com/5.11/isos/x86_64/
http://mirrors.ocf.berkeley.edu/centos/5.11/isos/x86_64/
http://centos.firehosted.com/5.11/isos/x86_64/
http://mirrors.usinternet.com/centos/5.11/isos/x86_64/
http://mirror.jaleco.com/centos/5.11/isos/x86_64/
http://mirrors.evowise.com/centos/5.11/isos/x86_64/
http://centos.eecs.wsu.edu/5.11/isos/x86_64/
http://linux.cc.lehigh.edu/centos/5.11/isos/x86_64/
http://mirror.sanctuaryhost.com/centos/5.11/isos/x86_64/
http://mirrors.usc.edu/pub/linux/distributions/centos/5.11/isos/x86_64/
http://mirror.oss.ou.edu/centos/5.11/isos/x86_64/
http://mirror.steadfast.net/centos/5.11/isos/x86_64/
http://mirror.clarkson.edu/centos/5.11/isos/x86_64/

Mirrors Verified Mon Apr 3 11:14:48 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