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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.tocici.com/centos/6.6/isos/x86_64/
http://centos.arvixe.com/6.6/isos/x86_64/
http://ftp.usf.edu/pub/centos/6.6/isos/x86_64/
http://mirrors.xmission.com/centos/6.6/isos/x86_64/
http://mirrors.mit.edu/centos/6.6/isos/x86_64/
http://mirror.symnds.com/CentOS/6.6/isos/x86_64/
http://mirror.net.cen.ct.gov/centos/6.6/isos/x86_64/
http://yum.tamu.edu/centos/6.6/isos/x86_64/
http://mirror.sanctuaryhost.com/centos/6.6/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/6.6/isos/x86_64/
http://mirrors.kernel.org/centos/6.6/isos/x86_64/
http://centos.mirror.constant.com/6.6/isos/x86_64/
http://mirror.ash.fastserv.com/pub/linux/centos/6.6/isos/x86_64/
http://mirrordenver.fdcservers.net/centos/6.6/isos/x86_64/
http://mirror.millry.co/CentOS/6.6/isos/x86_64/
http://mirror.beyondhosting.net/CentOS/6.6/isos/x86_64/
http://mirror.compevo.com/centos/6.6/isos/x86_64/
http://mirror.fdcservers.net/centos/6.6/isos/x86_64/
http://mirror-centos.hostingswift.com/centos/6.6/isos/x86_64/
http://mirror.es.its.nyu.edu/centos/6.6/isos/x86_64/
http://centos.mirror.facebook.net/6.6/isos/x86_64/
http://mirror.us.leaseweb.net/centos/6.6/isos/x86_64/
http://mirrors.centarra.com/centos/6.6/isos/x86_64/
http://mirror.cisp.com/CentOS/6.6/isos/x86_64/
http://centos-mirror.jchost.net/6.6/isos/x86_64/
http://centos.corenetworks.net/6.6/isos/x86_64/
http://repo.dimenoc.com/pub/centos/6.6/isos/x86_64/
http://centos.mirror.nac.net/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://centos.host-engine.com/6.6/isos/x86_64/
http://mirrors.rit.edu/centos/6.6/isos/x86_64/
http://dist1.800hosting.com/centos/6.6/isos/x86_64/
http://mirror.us.oneandone.net/linux/distributions/centos/6.6/isos/x86_64/
http://cosmos.cites.illinois.edu/pub/centos/6.6/isos/x86_64/
http://ftpmirror.your.org/pub/centos/6.6/isos/x86_64/
http://repos.dfw.quadranet.com/centos/6.6/isos/x86_64/
http://centos.mirrors.hoobly.com/6.6/isos/x86_64/
http://centos.mirrors.tds.net/pub/linux/centos/6.6/isos/x86_64/
http://mirrors.unifiedlayer.com/centos/6.6/isos/x86_64/
http://mirror.oss.ou.edu/centos/6.6/isos/x86_64/
http://mirrors.einstein.yu.edu/centos/6.6/isos/x86_64/
http://mirror.supremebytes.com/centos/6.6/isos/x86_64/
http://mirror.ubiquityservers.com/centos/6.6/isos/x86_64/
http://repos.lax.quadranet.com/centos/6.6/isos/x86_64/
http://mirrors.tummy.com/mirrors/CentOS/6.6/isos/x86_64/
http://mirrors.seas.harvard.edu/centos/6.6/isos/x86_64/
http://mirror.steadfast.net/centos/6.6/isos/x86_64/
http://mirror.lug.udel.edu/pub/centos/6.6/isos/x86_64/
http://mirror.umd.edu/centos/6.6/isos/x86_64/

Mirrors Verified Fri Oct 31 11:59:59 2014 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