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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://centos.mirrors.hoobly.com/6.6/isos/x86_64/
http://centos.mirror.constant.com/6.6/isos/x86_64/
http://centos.mia.host-engine.com/6.6/isos/x86_64/
http://mirror.pac-12.org/6.6/isos/x86_64/
http://mirror.cs.vt.edu/pub/CentOS/6.6/isos/x86_64/
http://mirror.teklinks.com/centos/6.6/isos/x86_64/
http://mirror.lug.udel.edu/pub/centos/6.6/isos/x86_64/
http://mirrors.tripadvisor.com/centos/6.6/isos/x86_64/
http://centos-mirror.jchost.net/6.6/isos/x86_64/
http://mirror.solarvps.com/centos/6.6/isos/x86_64/
http://mirror.symnds.com/CentOS/6.6/isos/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/6.6/isos/x86_64/
http://mirrors.greenmountainaccess.net/centos/6.6/isos/x86_64/
http://mirror.cisp.com/CentOS/6.6/isos/x86_64/
http://mirrors.liquidweb.com/CentOS/6.6/isos/x86_64/
http://cosmos.cites.illinois.edu/pub/centos/6.6/isos/x86_64/
http://mirrors.gigenet.com/centos/6.6/isos/x86_64/
ftp://ftp.wallawalla.edu/pub/mirrors/centos/6.6/isos/x86_64/
http://centos.chi.host-engine.com/6.6/isos/x86_64/
http://mirror.hmc.edu/centos/6.6/isos/x86_64/
http://mirror.rackspace.com/CentOS/6.6/isos/x86_64/
http://linux.mirrors.es.net/centos/6.6/isos/x86_64/
http://mirrors.maine.edu/CentOS/6.6/isos/x86_64/
http://mirror.spro.net/centos/6.6/isos/x86_64/
http://mirror.thelinuxfix.com/CentOS/6.6/isos/x86_64/
http://mirrors.xmission.com/centos/6.6/isos/x86_64/
http://mirror.anl.gov/pub/centos/6.6/isos/x86_64/
http://mirrors.umflint.edu/CentOS/6.6/isos/x86_64/
http://mirror.lax.hugeserver.com/centos/6.6/isos/x86_64/
http://centos.hostingxtreme.com/6.6/isos/x86_64/
http://mirror.evolvedservers.com/CentOS/6.6/isos/x86_64/
http://linux.cc.lehigh.edu/centos/6.6/isos/x86_64/
http://mirror.vtti.vt.edu/centos/6.6/isos/x86_64/
http://mirror-centos.hostingswift.com/centos/6.6/isos/x86_64/
http://mirror.ubiquityservers.com/centos/6.6/isos/x86_64/
http://lug.mtu.edu/centos/6.6/isos/x86_64/
http://mirror.oss.ou.edu/centos/6.6/isos/x86_64/
http://ftp.linux.ncsu.edu/pub/CentOS/6.6/isos/x86_64/
http://mirror.cs.pitt.edu/centos/6.6/isos/x86_64/
http://distro.ibiblio.org/centos/6.6/isos/x86_64/
http://mirror.us.leaseweb.net/centos/6.6/isos/x86_64/
http://mirror.tzulo.com/centos/6.6/isos/x86_64/
http://mirrors.rit.edu/centos/6.6/isos/x86_64/
http://mirror.compevo.com/centos/6.6/isos/x86_64/
http://centos.mirror.ndchost.com/6.6/isos/x86_64/
http://mirror.fdcservers.net/centos/6.6/isos/x86_64/
http://centos.mirror.nac.net/6.6/isos/x86_64/
http://dist1.800hosting.com/centos/6.6/isos/x86_64/
http://repos.mia.quadranet.com/centos/6.6/isos/x86_64/
http://mirror.net.cen.ct.gov/centos/6.6/isos/x86_64/

Mirrors Verified Sun Feb 1 19:16:04 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