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

The following mirrors should have the ISO images available:

http://mirrors.liquidweb.com/CentOS/4.9/isos/i386/
http://linux.mirrors.es.net/centos/4.9/isos/i386/
http://mirror.nwresd.org/pub/centos/4.9/isos/i386/
http://centos.servint.com/4.9/isos/i386/
http://mirror.net.cen.ct.gov/centos/4.9/isos/i386/
http://centos.mirror.netriplex.com/4.9/isos/i386/
http://mirror.teljet.net/centos4.9/isos/i386/
http://mirror.ash.fastserv.com/pub/linux/centos/4.9/isos/i386/
http://mirror.sanctuaryhost.com/centos/4.9/isos/i386/
http://mirror.singleedge.com/pub/centos/4.9/isos/i386/
http://mirrors.rit.edu/centos/4.9/isos/i386/
http://mirror.chpc.utah.edu/pub/centos/4.9/isos/i386/
http://mirror.thelinuxfix.com/CentOS/4.9/isos/i386/
http://www.gtlib.gatech.edu/pub/centos/4.9/isos/i386/
http://centos.mirror.facebook.net/4.9/isos/i386/
http://mirrors.lga7.us.voxel.net/centos/4.9/isos/i386/
http://centos.mirror.freedomvoice.com/4.9/isos/i386/
http://centos.eecs.wsu.edu/4.9/isos/i386/
http://mirror.ubiquityservers.com/centos/4.9/isos/i386/
http://mirror.raystedman.net/centos/4.9/isos/i386/
http://mirror.vcu.edu/pub/gnu+linux/centos/4.9/isos/i386/
http://mirror.web-ster.com/centos/4.9/isos/i386/
http://mirrors.ecvps.com/centos/4.9/isos/i386/
http://mirror.nexcess.net/CentOS/4.9/isos/i386/
http://centos.digitalcompass.net/centos/4.9/isos/i386/
http://centos.mirrors.tds.net/pub/linux/centos/4.9/isos/i386/
http://mirrors.arsc.edu/centos/4.9/isos/i386/
http://dist1.800hosting.com/centos/4.9/isos/i386/
http://centos.corenetworks.net/4.9/isos/i386/
http://mirrors.kernel.org/centos/4.9/isos/i386/
http://centos-distro.cavecreek.net/centos/4.9/isos/i386/
http://mirror.anl.gov/pub/centos/4.9/isos/i386/
http://mirror.hmc.edu/centos/4.9/isos/i386/
http://ftp.linux.ncsu.edu/pub/CentOS/4.9/isos/i386/
http://mirror.atlanticmetro.net/centos/4.9/isos/i386/
http://centos.netnitco.net/4.9/isos/i386/
http://mirror.team-cymru.org/CentOS/4.9/isos/i386/
http://mirror.umd.edu/centos/4.9/isos/i386/
http://mirror.trouble-free.net/centos/4.9/isos/i386/
http://mirror.symnds.com/CentOS/4.9/isos/i386/
http://mirror.cogentco.com/pub/linux/centos/4.9/isos/i386/
http://mirror.unl.edu/centos/4.9/isos/i386/
http://mirrors.syringanetworks.net/centos/4.9/isos/i386/
http://bay.uchicago.edu/centos/4.9/isos/i386/
http://centos.mirror.lstn.net/4.9/isos/i386/
http://mirrors.einstein.yu.edu/centos/4.9/isos/i386/
http://mirror.linux.duke.edu/pub/centos/4.9/isos/i386/
http://mirror.teklinks.com/centos/4.9/isos/i386/
http://mirrors.cmich.edu/centos/4.9/isos/i386/
http://centos.aol.com/4.9/isos/i386/
http://mirror.beyondhosting.net/CentOS/4.9/isos/i386/
http://mirror.steadfast.net/centos/4.9/isos/i386/
http://mirrors.usc.edu/pub/linux/distributions/centos/4.9/isos/i386/
http://mirrors.seas.harvard.edu/centos/4.9/isos/i386/
http://mirror.wiredtree.com/centos/4.9/isos/i386/
http://mirrors.greenmountainaccess.net/centos/4.9/isos/i386/
http://mirrors.login.com/centos/4.9/isos/i386/
http://mirrors.sonic.net/centos/4.9/isos/i386/
http://mirrors.finalasp.com/CentOS/4.9/isos/i386/
http://centos.mirrors.hoobly.com/4.9/isos/i386/
http://mirrors.xmission.com/centos/4.9/isos/i386/
http://mirrors.adams.net/centos/4.9/isos/i386/
http://mirror.fdcservers.net/centos/4.9/isos/i386/
http://centos.vipernetworksystems.com/4.9/isos/i386/
http://mirror.lug.udel.edu/pub/centos/4.9/isos/i386/
http://mirror.metrocast.net/centos/4.9/isos/i386/
http://mirror.stanford.edu/yum/pub/centos/4.9/isos/i386/
http://mirrors.cat.pdx.edu/centos/4.9/isos/i386/
http://mirrors.tummy.com/mirrors/CentOS/4.9/isos/i386/
http://mirror.ancl.hawaii.edu/linux/centos/4.9/isos/i386/
http://centos.fastsoft.net/4.9/isos/i386/
http://mirror.cisp.com/CentOS/4.9/isos/i386/
http://holmes.umflint.edu/centos/4.9/isos/i386/
http://mirror.pnl.gov/centos4.9/isos/i386/
http://mirror.serversurgeon.com/centos/4.9/isos/i386/
http://mirror.san.fastserv.com/pub/linux/centos/4.9/isos/i386/
http://mirror.rackspace.com/CentOS/4.9/isos/i386/
http://mirror.us.leaseweb.net/centos/4.9/isos/i386/
http://centos.mirrorcatalogs.com/4.9/isos/i386/
http://centos.mirror.choopa.net/4.9/isos/i386/
http://mirror.5ninesolutions.com/centos/4.9/isos/i386/
http://mirrors.bluehost.com/centos/4.9/isos/i386/
http://centos-mirror.jchost.net/4.9/isos/i386/
http://mirrors.loosefoot.com/centos/4.9/isos/i386/
http://centos.omnispring.com/4.9/isos/i386/
http://ftp.egr.msu.edu/pub/centos4.9/isos/i386/
http://mirrors.serveraxis.net/centos/4.9/isos/i386/
http://ftp.usf.edu/pub/centos/4.9/isos/i386/
http://ftp.osuosl.org/pub/centos/4.9/isos/i386/
http://mirror.flhsi.com/centos/4.9/isos/i386/
http://mirrors.versaweb.com/centos/4.9/isos/i386/
http://centos.mirror.nac.net/4.9/isos/i386/
http://mirror.7x24web.net/centos/4.9/isos/i386/
http://mirror.spro.net/centos/4.9/isos/i386/
http://centos.mbni.med.umich.edu/mirror/4.9/isos/i386/
http://pubmirrors.reflected.net/centos/4.9/isos/i386/
http://yum.phx.singlehop.com/centos/4.9/isos/i386/
http://yum.singlehop.com/CentOS/4.9/isos/i386/
http://mirror.cs.vt.edu/pub/CentOS/4.9/isos/i386/
http://mirrors.gigenet.com/centos/4.9/isos/i386/

Mirrors Verified Sun Jul 8 13:38:31 2012 UTC

Or use bittorrent to download the .torrent files provided.

Bittorrent is a peer to peer download system described at http://bittorrent.com/ and there are many clients available.

These include (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 : http://wiki.centos.org/AdditionalResources/Repositories