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

http://mirror.math.princeton.edu/pub/centos/8-stream/isos/ppc64le/
http://centos.mirror.constant.com/8-stream/isos/ppc64le/

http://mirrors.greenmountainaccess.net/centos/8-stream/isos/ppc64le/
http://mirror.ette.biz/centos/8-stream/isos/ppc64le/
http://mirror.umd.edu/centos/8-stream/isos/ppc64le/
http://mirror.us.oneandone.net/linux/distributions/centos/8-stream/isos/ppc64le/
http://centos-distro.cavecreek.net/centos/8-stream/isos/ppc64le/
http://mirror.metrocast.net/centos/8-stream/isos/ppc64le/
http://mirror.team-cymru.com/CentOS/8-stream/isos/ppc64le/
http://repos.lax.layerhost.com/centos/8-stream/isos/ppc64le/
http://packages.oit.ncsu.edu/centos/8-stream/isos/ppc64le/
http://linux.mirrors.es.net/centos/8-stream/isos/ppc64le/
http://mirror.keystealth.org/centos/8-stream/isos/ppc64le/
http://mirror.phx1.us.spryservers.net/centos/8-stream/isos/ppc64le/
http://linux-mirrors.fnal.gov/linux/centos/8-stream/isos/ppc64le/
http://mirrors.sonic.net/centos/8-stream/isos/ppc64le/
http://mirrors.cmich.edu/centos/8-stream/isos/ppc64le/
http://repo1.sea.innoscale.net/centos/8-stream/isos/ppc64le/
http://mirror.facebook.net/centos/8-stream/isos/ppc64le/
http://or-mirror.iwebfusion.net/centos/8-stream/isos/ppc64le/
http://mirror.mia.velocihost.net/centos/8-stream/isos/ppc64le/
http://mirrors.oit.uci.edu/centos/8-stream/isos/ppc64le/
http://mirror.cs.pitt.edu/centos/8-stream/isos/ppc64le/
http://mirrors.lug.mtu.edu/centos/8-stream/isos/ppc64le/
http://mirrors.mit.edu/centos/8-stream/isos/ppc64le/
http://mirrors.radwebhosting.com/centos/8-stream/isos/ppc64le/
http://nyc.mirrors.clouvider.net/CentOS/8-stream/isos/ppc64le/
http://repos.forethought.net/centos/8-stream/isos/ppc64le/
http://mirrors.rcs.alaska.edu/centos/8-stream/isos/ppc64le/
http://mirror.sfo12.us.leaseweb.net/centos/8-stream/isos/ppc64le/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/

Mirrors verified Sun May 29 09:07:31 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