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

http://forksystems.mm.fcix.net/centos/7.9.2009/isos/x86_64/
http://mirror.vcu.edu/pub/gnu_linux/centos/7.9.2009/isos/x86_64/
http://mirror.centos.iad1.serverforge.org/7.9.2009/isos/x86_64/
http://mirror.vtti.vt.edu/centos/7.9.2009/isos/x86_64/
http://mirror.cs.vt.edu/pub/CentOS/7.9.2009/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/7.9.2009/isos/x86_64/
http://mirror.ash.fastserv.com/centos/7.9.2009/isos/x86_64/
http://mirrors.advancedhosters.com/centos/7.9.2009/isos/x86_64/

http://mirror.atl.genesisadaptive.com/centos/7.9.2009/isos/x86_64/
http://mirrors.gigenet.com/centos/7.9.2009/isos/x86_64/
http://abqix.mm.fcix.net/centos/7.9.2009/isos/x86_64/
http://mirror.dal.nexril.net/centos/7.9.2009/isos/x86_64/
http://distro.ibiblio.org/centos/7.9.2009/isos/x86_64/
http://mirrors.rcs.alaska.edu/centos/7.9.2009/isos/x86_64/
http://bay.uchicago.edu/centos/7.9.2009/isos/x86_64/
http://mirror.metrocast.net/centos/7.9.2009/isos/x86_64/
http://centos.mirrors.hoobly.com/7.9.2009/isos/x86_64/
http://mirrors.xtom.com/centos/7.9.2009/isos/x86_64/
http://mirror.sfo12.us.leaseweb.net/centos/7.9.2009/isos/x86_64/
http://mirror.genesishosting.com/centos/7.9.2009/isos/x86_64/
http://southfront.mm.fcix.net/centos/7.9.2009/isos/x86_64/
http://mirrors.vcea.wsu.edu/centos/7.9.2009/isos/x86_64/
http://mirror.facebook.net/centos/7.9.2009/isos/x86_64/
http://mirror.math.princeton.edu/pub/centos/7.9.2009/isos/x86_64/
http://mirror.arizona.edu/centos/7.9.2009/isos/x86_64/
http://mirror.stjschools.org/centos/7.9.2009/isos/x86_64/
http://repos.forethought.net/centos/7.9.2009/isos/x86_64/
http://mirror.cs.pitt.edu/centos/7.9.2009/isos/x86_64/
http://mirror.cs.uwp.edu/pub/centos/7.9.2009/isos/x86_64/
http://centos.hivelocity.net/7.9.2009/isos/x86_64/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/

Mirrors verified Sun Jan 29 21:58:24 2023 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