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

http://mirror.cogentco.com/pub/linux/centos/8.5.2111/isos/x86_64/
http://mirror.cs.vt.edu/pub/CentOS/8.5.2111/isos/x86_64/
http://us.mirror.nsec.pt/centos/8.5.2111/isos/x86_64/
http://mirror.centos.iad1.serverforge.org/8.5.2111/isos/x86_64/
http://mirrors.advancedhosters.com/centos/8.5.2111/isos/x86_64/
http://mirror.vtti.vt.edu/centos/8.5.2111/isos/x86_64/
http://mirror.ash.fastserv.com/centos/8.5.2111/isos/x86_64/

http://repos.lax.layerhost.com/centos/8.5.2111/isos/x86_64/
http://ftpmirror.your.org/pub/centos/8.5.2111/isos/x86_64/
http://centos-distro.1gservers.com/8.5.2111/isos/x86_64/
http://mirrors.gigenet.com/centos/8.5.2111/isos/x86_64/
http://mirror.keystealth.org/centos/8.5.2111/isos/x86_64/
http://mirror.es.its.nyu.edu/centos/8.5.2111/isos/x86_64/
http://mirror.hackingand.coffee/centos/8.5.2111/isos/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/8.5.2111/isos/x86_64/
http://atl.mirrors.clouvider.net/CentOS/8.5.2111/isos/x86_64/
http://mirror.math.princeton.edu/pub/centos/8.5.2111/isos/x86_64/
http://mirror.cs.pitt.edu/centos/8.5.2111/isos/x86_64/
http://nc-centos-mirror.iwebfusion.net/centos/8.5.2111/isos/x86_64/
http://or-mirror.iwebfusion.net/centos/8.5.2111/isos/x86_64/
http://mirror.vacares.com/centos/8.5.2111/isos/x86_64/
http://mirrors.mit.edu/centos/8.5.2111/isos/x86_64/
http://ftp.usf.edu/pub/centos/8.5.2111/isos/x86_64/
http://mirrors.unifiedlayer.com/centos/8.5.2111/isos/x86_64/
http://mirror.atl.genesisadaptive.com/centos/8.5.2111/isos/x86_64/
http://yum.tamu.edu/centos/8.5.2111/isos/x86_64/
http://mirrors.ocf.berkeley.edu/centos/8.5.2111/isos/x86_64/
http://mirror.atlanticmetro.net/centos/8.5.2111/isos/x86_64/
http://mirrors.xtom.com/centos/8.5.2111/isos/x86_64/
http://mirror.genesisadaptive.com/centos/8.5.2111/isos/x86_64/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/

Mirrors verified Mon Jan 31 08:37:15 2022 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