In order to conserve the limited bandwidth available, ISO images are not downloadable from mirror.centos.org

http://mirror.atlanticmetro.net/centos/6.10/isos/x86_64/
http://mirror.umd.edu/centos/6.10/isos/x86_64/
http://mirror.cs.pitt.edu/centos/6.10/isos/x86_64/
http://ftp.usf.edu/pub/centos/6.10/isos/x86_64/
http://mirror.vcu.edu/pub/gnu_linux/centos/6.10/isos/x86_64/
http://repos-tx.psychz.net/centos/6.10/isos/x86_64/
http://mirror.genesishosting.com/centos/6.10/isos/x86_64/
http://mirrors.rit.edu/centos/6.10/isos/x86_64/
http://repos.forethought.net/centos/6.10/isos/x86_64/
http://mirror.centos.iad1.serverforge.org/6.10/isos/x86_64/
http://mirror.rackspace.com/CentOS/6.10/isos/x86_64/
http://mirror.shastacoe.net/centos/6.10/isos/x86_64/
http://linux.cc.lehigh.edu/centos/6.10/isos/x86_64/
http://mirror.fileplanet.com/centos/6.10/isos/x86_64/
http://sjc.edge.kernel.org/centos/6.10/isos/x86_64/
http://mirrors.cat.pdx.edu/centos/6.10/isos/x86_64/
http://mirror.web-ster.com/centos/6.10/isos/x86_64/
http://mirror.twinlakes.net/centos/6.10/isos/x86_64/
http://mirrors.xmission.com/centos/6.10/isos/x86_64/
http://mirror.centos.lax1.serverforge.org/6.10/isos/x86_64/
http://mirror.clarkson.edu/centos/6.10/isos/x86_64/
http://mirror.grid.uchicago.edu/pub/linux/centos/6.10/isos/x86_64/
http://mirror.lug.udel.edu/pub/centos/6.10/isos/x86_64/
http://atl.mirrors.clouvider.net/CentOS/6.10/isos/x86_64/
http://mirrors.greenmountainaccess.net/centos/6.10/isos/x86_64/
http://mirrors.lug.mtu.edu/centos/6.10/isos/x86_64/
http://mirrors.rcs.alaska.edu/centos/6.10/isos/x86_64/
http://mirror.compevo.com/centos/6.10/isos/x86_64/
http://mirror.trouble-free.net/centos/6.10/isos/x86_64/
http://repo1.dal.innoscale.net/centos/6.10/isos/x86_64/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/

Mirrors verified Wed Nov 11 16:22:15 2020 UTC

You can also download the ISO images using bittorrent, a peer-to-peer file sharing protocol. The .torrent files can be found from CentOS mirrors. Various bittorrent clients are available, including (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: https://wiki.centos.org/AdditionalResources/Repositories