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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.web-ster.com/centos/6.6/isos/x86_64/
http://centos-mirror.jchost.net/6.6/isos/x86_64/
http://mirror.redsox.cc/pub/CentOS/6.6/isos/x86_64/
http://mirror.hostduplex.com/centos/6.6/isos/x86_64/
http://mirror.us.oneandone.net/linux/distributions/centos/6.6/isos/x86_64/
http://mirrors.greenmountainaccess.net/centos/6.6/isos/x86_64/
http://mirrors.psychz.net/Centos/6.6/isos/x86_64/
http://lug.mtu.edu/centos/6.6/isos/x86_64/
http://mirror.beyondhosting.net/CentOS/6.6/isos/x86_64/
http://mirror.chpc.utah.edu/pub/centos/6.6/isos/x86_64/
http://www.gtlib.gatech.edu/pub/centos/6.6/isos/x86_64/
http://mirrors.arsc.edu/centos/6.6/isos/x86_64/
http://mirror.ubiquityservers.com/centos/6.6/isos/x86_64/
http://centos.arvixe.com/6.6/isos/x86_64/
http://mirror.cs.vt.edu/pub/CentOS/6.6/isos/x86_64/
http://mirror.atlanticmetro.net/centos/6.6/isos/x86_64/
http://mirrors.syringanetworks.net/centos/6.6/isos/x86_64/
http://mirror.clarkson.edu/centos/6.6/isos/x86_64/
http://mirror.cc.columbia.edu/pub/linux/centos/6.6/isos/x86_64/
http://mirror.team-cymru.org/CentOS/6.6/isos/x86_64/
http://mirrors.centos.webair.com/centos/6.6/isos/x86_64/
http://mirrors.cat.pdx.edu/centos/6.6/isos/x86_64/
http://mirror.vtti.vt.edu/centos/6.6/isos/x86_64/
http://mirror.5ninesolutions.com/centos/6.6/isos/x86_64/
http://ftp.usf.edu/pub/centos/6.6/isos/x86_64/
http://linux.mirrors.es.net/centos/6.6/isos/x86_64/
http://mirror.acsnet.com/centos/6.6/isos/x86_64/
http://mirror.1stclasshosting.com/centos/6.6/isos/x86_64/
http://mirrors.xmission.com/centos/6.6/isos/x86_64/
http://repo.atlantic.net/centos/6.6/isos/x86_64/
http://mirror.nexcess.net/CentOS/6.6/isos/x86_64/
http://centos.mirror.lstn.net/6.6/isos/x86_64/
http://mirror.tzulo.com/centos/6.6/isos/x86_64/
http://mirror.cs.pitt.edu/centos/6.6/isos/x86_64/
http://mirror.dattobackup.com/CentOS/6.6/isos/x86_64/
ftp://ftp.wallawalla.edu/pub/mirrors/centos/6.6/isos/x86_64/
http://repos.redrockhost.com/centos/6.6/isos/x86_64/
http://centos.mirrors.tds.net/pub/linux/centos/6.6/isos/x86_64/
http://mirror.netdepot.com/centos/6.6/isos/x86_64/
http://mirror.metrocast.net/centos/6.6/isos/x86_64/
http://mirror.evolvedservers.com/CentOS/6.6/isos/x86_64/
http://mirror.keystealth.org/centos/6.6/isos/x86_64/
http://mirrors.maine.edu/CentOS/6.6/isos/x86_64/
http://mirror.rackspace.com/CentOS/6.6/isos/x86_64/
http://mirror-centos.hostingswift.com/centos/6.6/isos/x86_64/
http://mirrors.umflint.edu/CentOS/6.6/isos/x86_64/
http://mirrors.lga7.us.voxel.net/centos/6.6/isos/x86_64/
http://mirror.ash.fastserv.com/pub/linux/centos/6.6/isos/x86_64/
http://distro.ibiblio.org/centos/6.6/isos/x86_64/
http://centos.mia.host-engine.com/6.6/isos/x86_64/

Mirrors Verified Sun Jul 5 05:42:45 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