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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.cisp.com/CentOS/6.8/isos/x86_64/
http://mirrors.lga7.us.voxel.net/centos/6.8/isos/x86_64/
http://mirror.raystedman.net/centos/6.8/isos/x86_64/
http://mirror.jax.hugeserver.com/centos/6.8/isos/x86_64/
http://centos.unixheads.org/6.8/isos/x86_64/
http://mirror.atlantic.net/centos/6.8/isos/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/6.8/isos/x86_64/
http://mirrors.usc.edu/pub/linux/distributions/centos/6.8/isos/x86_64/
http://mirrors.centos.webair.com/centos/6.8/isos/x86_64/
http://centos.chi.host-engine.com/6.8/isos/x86_64/
http://mirrors.cat.pdx.edu/centos/6.8/isos/x86_64/
http://reflector.westga.edu/repos/CentOS/6.8/isos/x86_64/
http://repo1.dal.innoscale.net/centos/6.8/isos/x86_64/
http://mirror.tocici.com/centos/6.8/isos/x86_64/
http://mirror.hostduplex.com/centos/6.8/isos/x86_64/
http://mirror.pac-12.org/6.8/isos/x86_64/
http://dallas.tx.mirror.xygenhosting.com/CentOS/6.8/isos/x86_64/
http://mirror.ancl.hawaii.edu/linux/centos/6.8/isos/x86_64/
http://linux.cc.lehigh.edu/centos/6.8/isos/x86_64/
http://mirror.nodesdirect.com/centos/6.8/isos/x86_64/
http://mirror.net.cen.ct.gov/centos/6.8/isos/x86_64/
http://mirror.cs.vt.edu/pub/CentOS/6.8/isos/x86_64/
http://mirrors.usinternet.com/centos/6.8/isos/x86_64/
http://mirror.spro.net/centos/6.8/isos/x86_64/
http://centos.mirror.ndchost.com/6.8/isos/x86_64/
http://mirror.steadfast.net/centos/6.8/isos/x86_64/
http://mirrors.seas.harvard.edu/centos/6.8/isos/x86_64/
http://mirror.cs.pitt.edu/centos/6.8/isos/x86_64/
http://centos.mia.host-engine.com/6.8/isos/x86_64/
http://mirror.teklinks.com/centos/6.8/isos/x86_64/
http://mirror.n5tech.com/CentOS/6.8/isos/x86_64/
http://centos.mirrors.hoobly.com/6.8/isos/x86_64/
http://mirror.oss.ou.edu/centos/6.8/isos/x86_64/
http://bay.uchicago.edu/centos/6.8/isos/x86_64/
http://mirrors.kernel.org/centos/6.8/isos/x86_64/
http://mirror.sigmanet.com/centos/6.8/isos/x86_64/
http://mirror.5ninesolutions.com/centos/6.8/isos/x86_64/
http://repos.lax.quadranet.com/centos/6.8/isos/x86_64/
http://mirrors.advancedhosters.com/centos/6.8/isos/x86_64/
http://mirrors.evowise.com/centos/6.8/isos/x86_64/

Mirrors Verified Sat Jan 21 20:47:00 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