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

http://repos-va.psychz.net/centos/6.10/isos/i386/
http://mirror.cogentco.com/pub/linux/centos/6.10/isos/i386/
http://repo1.ash.innoscale.net/centos/6.10/isos/i386/
http://mirror.ash.fastserv.com/centos/6.10/isos/i386/
http://mirror.centos.iad1.serverforge.org/6.10/isos/i386/
http://mirrors.advancedhosters.com/centos/6.10/isos/i386/
http://us.mirror.nsec.pt/centos/6.10/isos/i386/
http://mirror.vtti.vt.edu/centos/6.10/isos/i386/
http://mirror.cs.vt.edu/pub/CentOS/6.10/isos/i386/
http://mirror.vcu.edu/pub/gnu_linux/centos/6.10/isos/i386/
http://centos4.zswap.net/6.10/isos/i386/

http://mirror.us-midwest-1.nexcess.net/CentOS/6.10/isos/i386/
http://mirrors.raystedman.org/centos/6.10/isos/i386/
http://mirror.team-cymru.com/CentOS/6.10/isos/i386/
http://mirror.keystealth.org/centos/6.10/isos/i386/
http://mirror.twinlakes.net/centos/6.10/isos/i386/
http://ftp.osuosl.org/pub/centos/6.10/isos/i386/
http://repos-lax.psychz.net/centos/6.10/isos/i386/
http://mirrors.seas.harvard.edu/centos/6.10/isos/i386/
http://centos.host-engine.com/6.10/isos/i386/
http://mirror.cs.uwp.edu/pub/centos/6.10/isos/i386/
http://mirror.mojohost.com/centos/6.10/isos/i386/
http://centos.mirror.constant.com/6.10/isos/i386/
http://mirror.mia11.us.leaseweb.net/centos/6.10/isos/i386/
http://mirrors.lug.mtu.edu/centos/6.10/isos/i386/
http://ftpmirror.your.org/pub/centos/6.10/isos/i386/
http://mirrors.xtom.com/centos/6.10/isos/i386/
http://mirror.lug.udel.edu/pub/centos/6.10/isos/i386/
http://repos.mia.quadranet.com/centos/6.10/isos/i386/
http://mirrors.sonic.net/centos/6.10/isos/i386/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/

Mirrors verified Thu Jun 4 03:54:46 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