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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.usc.edu/pub/linux/distributions/centos/6.9/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/6.9/isos/x86_64/
http://www.gtlib.gatech.edu/pub/centos/6.9/isos/x86_64/
http://mirror.hostduplex.com/centos/6.9/isos/x86_64/
http://mirror.vtti.vt.edu/centos/6.9/isos/x86_64/
http://centos.sonn.com/6.9/isos/x86_64/
http://mirrors.kernel.org/centos/6.9/isos/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/6.9/isos/x86_64/
http://mirrors.cat.pdx.edu/centos/6.9/isos/x86_64/
http://mirrors.cmich.edu/centos/6.9/isos/x86_64/
http://mirror.hmc.edu/centos/6.9/isos/x86_64/
http://mirrors.rit.edu/centos/6.9/isos/x86_64/
http://yum.tamu.edu/centos/6.9/isos/x86_64/
http://mirror.dal10.us.leaseweb.net/centos/6.9/isos/x86_64/
http://mirror.net.cen.ct.gov/centos/6.9/isos/x86_64/
http://mirror.trouble-free.net/centos/6.9/isos/x86_64/
http://centos.eecs.wsu.edu/6.9/isos/x86_64/
http://linux.mirrors.es.net/centos/6.9/isos/x86_64/
http://mirror.solarvps.com/centos/6.9/isos/x86_64/
http://repo1.ash.innoscale.net/centos/6.9/isos/x86_64/
http://mirror.cs.pitt.edu/centos/6.9/isos/x86_64/
http://centos.mirror.ndchost.com/6.9/isos/x86_64/
http://mirror.scalabledns.com/centos/6.9/isos/x86_64/
http://mirror.genesisadaptive.com/centos/6.9/isos/x86_64/
http://mirror.wdc1.us.leaseweb.net/centos/6.9/isos/x86_64/
http://mirrors.maine.edu/CentOS/6.9/isos/x86_64/
http://centos.mirrors.tds.net/pub/linux/centos/6.9/isos/x86_64/
http://mirrordenver.fdcservers.net/centos/6.9/isos/x86_64/
http://mirror.keystealth.org/centos/6.9/isos/x86_64/
http://mirror.mojohost.com/centos/6.9/isos/x86_64/
http://repos-tx.psychz.net/centos/6.9/isos/x86_64/
http://repo.us.bigstepcloud.com/centos/6.9/isos/x86_64/
http://mirror.math.princeton.edu/pub/centos/6.9/isos/x86_64/
http://mirrors.liquidweb.com/CentOS/6.9/isos/x86_64/
http://bay.uchicago.edu/centos/6.9/isos/x86_64/
http://mirrors.tripadvisor.com/centos/6.9/isos/x86_64/
http://centos.gbeservers.com/6.9/isos/x86_64/
http://mirror.steadfast.net/centos/6.9/isos/x86_64/
http://mirrors.vpsie.com/centos/6.9/isos/x86_64/
http://centos.blazar.mx/6.9/isos/x86_64/
http://mirror.jax.hugeserver.com/centos/6.9/isos/x86_64/
http://mirror.compevo.com/centos/6.9/isos/x86_64/
http://reflector.westga.edu/repos/CentOS/6.9/isos/x86_64/
http://mirror.cloud-bricks.net/centos/6.9/isos/x86_64/
http://mirror.riverfrontnetworks.com/CentOS/6.9/isos/x86_64/
http://centos-distro.1gservers.com/6.9/isos/x86_64/
http://mirrors.umflint.edu/CentOS/6.9/isos/x86_64/
http://mirror.cs.vt.edu/pub/CentOS/6.9/isos/x86_64/
http://mirror.fileplanet.com/centos/6.9/isos/x86_64/
http://denver.gaminghost.co/6.9/isos/x86_64/

Mirrors Verified Sun Dec 17 09:46:47 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