Hi fellow mirror admins. I made a list of mirrors that have a published AAAA record, and checked if those mirrors are actually reachable by IPv6. Unfortunately it looks like there is a significant amount of mirrors that do have an AAAA record, but the actual services (http, ftp, rsync) are not available by IPv6. Here is the list: FAIL: http://mirrors.arsc.edu/centos/ FAIL: ftp://mirrors.arsc.edu/centos/ OK: http://linux.mirrors.es.net/centos/ OK: ftp://linux.mirrors.es.net/centos/ OK: rsync://linux.mirrors.es.net/linux-pub/ OK: http://mirrors.loosefoot.com/centos/ OK: ftp://mirrors.loosefoot.com/centos/ OK: rsync://mirrors.loosefoot.com/centos/ OK: http://ftp.usf.edu/pub/centos/ OK: ftp://ftp.usf.edu/pub/centos/ OK: http://www.gtlib.gatech.edu/pub/centos/ OK: ftp://ftp.gtlib.gatech.edu/pub/centos/ OK: rsync://rsync.gtlib.gatech.edu/centos/ OK: http://mirror.ancl.hawaii.edu/linux/centos/ OK: http://mirrors.syringanetworks.net/centos/ OK: ftp://mirrors.syringanetworks.net/centos/ OK: rsync://mirrors.syringanetworks.net/centos/ OK: http://mirror.anl.gov/pub/centos/ OK: ftp://mirror.anl.gov/pub/centos/ OK: rsync://mirror.anl.gov/centos/ OK: http://mirror.fdcservers.net/centos/ FAIL: ftp://mirror.fdcservers.net/centos/ OK: http://mirrors.gigenet.com/centos/ OK: ftp://mirrors.gigenet.com/centos/ OK: rsync://mirrors.gigenet.com/centos/ OK: http://mirrors.serveraxis.net/centos/ OK: ftp://mirrors.serveraxis.net/centos/ OK: http://mirror.steadfast.net/centos/ OK: ftp://mirror.steadfast.net/centos/ OK: rsync://mirror.steadfast.net/centos/ OK: http://mirror.team-cymru.org/CentOS/ OK: ftp://mirror.team-cymru.org/CentOS/ OK: rsync://mirror.team-cymru.org/CentOS OK: http://centos.netnitco.net/ FAIL: ftp://centos.netnitco.net/centos/ OK: ftp://mirror.atlantic.net/pub/centos/ OK: http://ftp.belnet.be/packages/centos/ OK: ftp://ftp.belnet.be/packages/centos/ OK: rsync://ftp.belnet.be/packages/centos/ OK: http://be.mirror.eurid.eu/centos/ FAIL: ftp://be.mirror.eurid.eu/centos/ FAIL: rsync://centos.bg/mirror OK: http://ftp.fi.muni.cz/pub/linux/centos/ OK: ftp://ftp.fi.muni.cz/pub/linux/centos/ OK: rsync://ftp.fi.muni.cz/pub/linux/centos/ OK: http://mirror.hosting90.cz/centos/ FAIL: ftp://mirror.hosting90.cz/centos/ OK: http://mirror.karneval.cz/pub/centos/ OK: ftp://mirror.karneval.cz/pub/centos/ OK: http://centos.slu.cz/mirror/ FAIL: ftp://centos.slu.cz/centos/ FAIL: rsync://centos.slu.cz/CentOS FAIL: http://ftp.estpak.ee/pub/centos/ FAIL: ftp://ftp.estpak.ee/pub/centos/ FAIL: rsync://ftp.estpak.ee/centos OK: http://mirror.academica.fi/CentOS/ OK: ftp://mirror.academica.fi/CentOS/ FAIL: rsync://mirror.academica.fi/CentOS OK: http://ftp.funet.fi/pub/mirrors/centos.org/ OK: ftp://ftp.funet.fi/pub/mirrors/centos.org/ OK: rsync://rsync.nic.funet.fi/pub/mirrors/centos.org/ OK: http://ftp.ciril.fr/pub/linux/centos/ OK: ftp://ftp.ciril.fr/pub/linux/centos/ OK: rsync://ftp.ciril.fr/pub/linux/centos/ OK: ftp://ftp.free.fr/mirrors/ftp.centos.org/ OK: http://mirrors.ircam.fr/pub/CentOS/ OK: ftp://mirrors.ircam.fr/pub/CentOS/ OK: rsync://mirrors.ircam.fr/CentOS/ OK: http://mirror.ovh.net/ftp.centos.org/ OK: ftp://mirror.ovh.net/ftp.centos.org/ OK: rsync://mirror.ovh.net/ftp.centos.org/ FAIL: http://centos.crazyfrogs.org/ FAIL: rsync://centos.crazyfrogs.org/centos/ OK: http://mirror.checkdomain.de/centos OK: ftp://mirror.checkdomain.de/centos OK: http://ftp.hosteurope.de/mirror/centos.org/ OK: ftp://ftp.hosteurope.de/mirror/centos.org/ FAIL: rsync://ftp.hosteurope.de/centos/ OK: http://mirror.de.leaseweb.net/centos/ FAIL: ftp://mirror.de.leaseweb.net/centos/ OK: rsync://mirror.de.leaseweb.net/centos/ OK: http://centos.bio.lmu.de/ FAIL: ftp://centos.bio.lmu.de/centos/ FAIL: rsync://centos.bio.lmu.de/CentOS/ OK: http://mirror.netcologne.de/centos/ OK: ftp://mirror.netcologne.de/centos/ OK: rsync://mirror.netcologne.de/centos/ OK: http://centos.kiewel-online.ch/centos/ FAIL: ftp://mirror.kiewel-online.ch/centos/ OK: http://ftp.plusline.de/centos/ OK: ftp://ftp.plusline.de/pub/centos/ OK: rsync://ftp.plusline.de/CentOS/ OK: http://ftp.freepark.org/pub/linux/distributions/centos/ OK: ftp://ftp.freepark.org/pub/linux/distributions/centos/ OK: rsync://ftp.freepark.org/linux/centos/ OK: http://ftp.heanet.ie/pub/centos/ OK: ftp://ftp.heanet.ie/pub/centos/ OK: rsync://ftp.heanet.ie/pub/centos/ FAIL: ftp://ftp.eutelia.it/CentOS FAIL: ftp://ftp.eutelia.it/CentOS/ OK: http://mi.mirror.garr.it/mirrors/CentOS/ OK: ftp://mi.mirror.garr.it/mirrors/CentOS/ OK: rsync://mi.mirror.garr.it/CentOS/ OK: http://centos.linux.edu.lv/ OK: http://centos.mirror.root.lu/ OK: ftp://mirror.root.lu/centos/ OK: rsync://mirror.root.lu/CentOS OK: http://centos.ustc.edu.cn/centos/ OK: http://ftp.cuhk.edu.hk/pub/Linux/centos/ OK: ftp://ftp.cuhk.edu.hk/pub/Linux/centos/ OK: http://ftp.iij.ad.jp/pub/linux/centos/ OK: ftp://ftp.iij.ad.jp/pub/linux/centos/ FAIL: rsync://ftp.iij.ad.jp/centos/ OK: http://ftp.jaist.ac.jp/pub/Linux/CentOS/ OK: ftp://ftp.jaist.ac.jp/pub/Linux/CentOS/ OK: rsync://ftp.jaist.ac.jp/pub/Linux/CentOS/ OK: ftp://ftp.kddilabs.jp/Linux/packages/CentOS/ OK: rsync://rsync.kddilabs.jp/centos/ OK: http://ftp.nara.wide.ad.jp/pub/Linux/centos/ OK: ftp://ftp.nara.wide.ad.jp/pub/Linux/centos/ OK: rsync://ftp.nara.wide.ad.jp/centos OK: http://ftp.tsukuba.wide.ad.jp/Linux/centos/ OK: http://ftp.yz.yamagata-u.ac.jp/pub/linux/centos/ OK: ftp://ftp.yz.yamagata-u.ac.jp/pub/linux/centos/ FAIL: http://stingray.cyber.net.pk/pub/centos/ FAIL: ftp://stingray.cyber.net.pk/pub/centos/ FAIL: rsync://stingray.cyber.net.pk/pub/centos/ OK: http://mirror.learn.ac.lk/centos/ FAIL: ftp://mirror.learn.ac.lk/pub/centos/ OK: rsync://mirror.learn.ac.lk/centos/ OK: http://ftp.stu.edu.tw/Linux/CentOS/ OK: ftp://ftp.stu.edu.tw/Linux/CentOS/ OK: http://ftp.twaren.net/Linux/CentOS/ OK: ftp://ftp.twaren.net/Linux/CentOS/ OK: http://ftp.nsysu.edu.tw/CentOS/ FAIL: ftp://ftp.nsysu.edu.tw/CentOS/ OK: http://ftp.tc.edu.tw/Linux/CentOS/ FAIL: ftp://ftp.tc.edu.tw/Linux/Centos/ OK: http://mirror.aarnet.edu.au/pub/centos/ OK: ftp://mirror.aarnet.edu.au/pub/centos/ OK: rsync://mirror.aarnet.edu.au/centos/ OK: http://mirror.as24220.net/pub/centos/ OK: ftp://mirror.as24220.net/pub/centos/ OK: rsync://mirror.as24220.net/pub/centos/ OK: http://mirror.primusdatacentre.com.au/centos/ FAIL: ftp://mirror.primusdatacentre.com.au/centos/ OK: http://ftp.swin.edu.au/centos/ OK: ftp://ftp.swin.edu.au/centos/ OK: rsync://ftp.swin.edu.au/centos/ OK: http://centos.mirror.uber.com.au/ OK: rsync://mirror.uber.com.au/centos OK: http://mirrors.coopvgg.com.ar/centos/ OK: ftp://mirrors.coopvgg.com.ar/centos/ OK: rsync://mirrors.coopvgg.com.ar/centos/ FAIL: ftp://ftp.inf.utfsm.cl/pub/Linux/CentOS/ FAIL: rsync://ftp.inf.utfsm.cl/pub/Linux/CentOS/ OK: http://mirror.denit.net/centos/ FAIL: ftp://mirror.denit.net/centos/ OK: http://nl.mirror.eurid.eu/centos/ FAIL: ftp://nl.mirror.eurid.eu/centos/ OK: http://mirror.nl.leaseweb.net/centos/ FAIL: ftp://mirror.nl.leaseweb.net/centos/ OK: rsync://mirror.nl.leaseweb.net/centos/ OK: http://centos.mirror.serverbeheren.nl/ FAIL: rsync://centos.mirror.serverbeheren.nl/centos/ OK: http://ftp.nluug.nl/ftp/pub/os/Linux/distr/CentOS/ OK: ftp://ftp.nluug.nl/pub/os/Linux/distr/CentOS/ OK: rsync://ftp.nluug.nl/CentOS/ OK: http://mirror.oxilion.nl/centos/ OK: ftp://mirror.oxilion.nl/centos/ OK: rsync://mirror.oxilion.nl/centos/ OK: http://centos.uib.no/ OK: ftp://centos.uib.no/pub/Linux/Distributions/centos/ OK: rsync://centos.uib.no/centos/ OK: http://ftp.uninett.no/pub/Linux/centos/ OK: ftp://ftp.uninett.no/pub/linux/centos/ OK: rsync://ftp.uninett.no/centos/ FAIL: http://centos.hitme.net.pl/ OK: http://mirrors.nfsi.pt/CentOS/ OK: ftp://ftp.nfsi.pt/pub/CentOS/ OK: http://ftp.iasi.roedu.net/mirrors/centos.org/ OK: ftp://ftp.iasi.roedu.net/mirrors/centos.org/ OK: rsync://ftp.iasi.roedu.net/centos/ OK: http://ftp.ines.lug.ro/centos/ OK: ftp://ftp.ines.lug.ro/centos/ OK: http://mirror.corbina.net/pub/Linux/centos/ OK: ftp://mirror.corbina.net/pub/Linux/centos/ OK: rsync://mirror.corbina.net/centos OK: http://mirror.yandex.ru/centos/ OK: ftp://mirror.yandex.ru/centos/ OK: rsync://mirror.yandex.ru/centos/ OK: http://ftp.energotel.sk/pub/linux/centos/ OK: ftp://ftp.energotel.sk/pub/linux/centos/ OK: rsync://ftp.energotel.sk/centos/ OK: http://ftp.arnes.si/pub/mirrors/centos.org/ OK: ftp://ftp.arnes.si/mirrors/centos.org/ OK: http://mirror.lihnidos.org/CentOS/ OK: http://ftp.cica.es/CentOS/ OK: ftp://ftp.cica.es/CentOS/ FAIL: rsync://rsync.cica.es/CentOS/ OK: http://ftp.sunet.se/pub/Linux/distributions/centos/ OK: ftp://ftp.sunet.se/pub/Linux/distributions/centos/ OK: rsync://ftp.sunet.se/pub/Linux/distributions/centos/ OK: http://mirror.switch.ch/ftp/mirror/centos/ OK: ftp://mirror.switch.ch/mirror/centos/ OK: http://repo.boun.edu.tr/centos/ FAIL: ftp://repo.boun.edu.tr/centos/ OK: http://ftp.itu.edu.tr/Mirror/CentOS/ OK: ftp://ftp.itu.edu.tr/Mirror/CentOS/ FAIL: http://mirror.for.me.uk/centos/ OK: http://mirror.bytemark.co.uk/centos/ OK: ftp://mirror.bytemark.co.uk/centos/ OK: rsync://mirror.bytemark.co.uk/centos OK: http://mirrors.coreix.net/centos/ OK: http://mirror.sov.uk.goscomb.net/centos/ OK: ftp://mirror.sov.uk.goscomb.net/centos/ OK: http://centos.mirror.bradiceanu.net/ OK: ftp://centos.mirror.bradiceanu.net/centos/ OK: rsync://mirror.bradiceanu.net/CentOS FAIL: http://mirror.its.dal.ca/centos/ FAIL: ftp://mirror.its.dal.ca/centos/ FAIL: rsync://mirror.its.dal.ca/centos/ OK: http://centos.mirror.nexicom.net/ FAIL: ftp://mirror.nexicom.net/pub/centos/ OK: rsync://mirror.nexicom.net/CentOS OK: http://centos.mirror.iweb.ca/ OK: ftp://centos.mirror.iweb.ca/ OK: rsync://centos.mirror.iweb.ca/centos OK: http://mirror.metrocast.net/centos/ OK: http://mirror.atlanticmetro.net/centos/ FAIL: ftp://mirror.atlanticmetro.net/centos/ OK: http://mirrors.cat.pdx.edu/centos/ OK: rsync://mirrors.cat.pdx.edu/centos/ OK: http://centos.mirror.lstn.net/ FAIL: ftp://centos.mirror.lstn.net/ OK: rsync://centos.mirror.lstn.net/ OK: http://mirror.chpc.utah.edu/pub/centos/ OK: rsync://mirror.chpc.utah.edu/pub/centos/ OK: http://mirrors.xmission.com/centos/ OK: ftp://mirrors.xmission.com/centos/ OK: rsync://mirrors.xmission.com/centos/ OK: http://mirror.us.leaseweb.net/centos/ FAIL: ftp://mirror.us.leaseweb.net/centos/ OK: rsync://mirror.us.leaseweb.net/centos/ FAIL: http://centos.supsec.org/ FAIL: ftp://centos.supsec.org/pub/linux/centos/ FAIL: rsync://centos.supsec.org/centos/ OK: http://mirror.cs.vt.edu/pub/CentOS/ FAIL: ftp://mirror.cs.vt.edu/pub/CentOS/ FAIL: http://mirror.yellowfiber.net/centos/ OK: http://mirror.teljet.net/centos OK: ftp://ftp.ne.jp/Linux/packages/CentOS/ The ones marked FAIL are mirrors which have an AAAA record but are not reachable by IPv6. My tests were done primarily from AS 29422, with some spot checking from ASs 29169 and 16276. If you have concerns/doubts about some specific server's test results, feel free to contact me off-list for more details and/or more tests.