I did a quick script to count most used prefixes in SRC_URI yesterday (https://github.com/iksaif/portage-janitor/blob/master/mirrors.py)
Here is the (filtered) result: $ eix --only-names | python mirrors.py --count 960 http://dev.gentoo.org 372 http://xorg.freedesktop.org 372 http://xorg.freedesktop.org/releases 372 http://xorg.freedesktop.org/releases/individual 306 http://pear.php.net 306 http://pear.php.net/get 256 http://oss.tresys.com 255 http://oss.tresys.com/files 255 http://oss.tresys.com/files/refpolicy 225 http://hackage.haskell.org/packages 225 http://hackage.haskell.org/packages/archive 225 http://hackage.haskell.org 206 http://ftp.xemacs.org 201 https://github.com 196 http://ftp.xemacs.org/pub 196 http://ftp.xemacs.org/pub/xemacs 193 http://ftp.xemacs.org/pub/xemacs/packages 181 http://gstreamer.freedesktop.org 181 http://gstreamer.freedesktop.org/src 175 http://launchpad.net 175 http://linuxgazette.net 143 http://github.com 130 http://pear.horde.org 130 http://pear.horde.org/get 101 http://savannah.nongnu.org/download 101 http://savannah.nongnu.org 100 http://get.qt.nokia.com 97 ftp://sources.redhat.com/pub 97 ftp://sources.redhat.com 96 http://get.qt.nokia.com/qt 95 http://get.qt.nokia.com/qt/source 90 http://download.gna.org 75 http://pecl.php.net 75 http://pecl.php.net/get 72 http://components.ez.no/get 72 http://components.ez.no 69 https://fedorahosted.org 67 http://www.phrack.org/archives 67 http://www.phrack.org/archives/tgz 67 http://www.phrack.org >From that output we can easilly find out new entries to thirdpartymirrors, for example: gentoo-dev http://dev.gentoo.org xorg http://xorg.freedesktop.org gna http://download.gna.org pecl http://pecl.php.net pear http://pear.php.net github https://github.com http://github.com xemacs http://ftp.xemacs.org/pub/ ftp://ftp.sa.xemacs.org/pub/ launchpad http://launchpad.net redhat ftp://sources.redhat.com/pub/ (and probably others !) etc... The good part is that once you've modified thirdpartymirrors with new mirrors, running mirrors.py --all will generate a big patch for all your ebuilds to use those new mirrors ! -- Corentin Chary http://xf.iksaif.net