Twin directories of superopt:

[DIR]  ftp://134.121.1.1/.snapshot/nightly.3/pub/gnu/superopt/
[DIR]  ftp://134.121.1.1/pub/gnu.OLD/superopt/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.2/pub/gnu/superopt/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.1/pub/gnu/superopt/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.0/pub/gnu/superopt/
[DIR]  ftp://134.121.1.1/.snapshot/hourly.1/pub/gnu/superopt/
[DIR]  ftp://ftp.cesca.es/mirror2/gnu/superopt/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/gnu/superopt/
[DIR]  ftp://aeneas.mit.edu/pub/gnu/superopt/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/ftp/gnu/superopt/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/gnu/gnu/superopt/
[DIR]  ftp://ftp.mcs.vuw.ac.nz/_mnt/pub/packages/gnu/superopt/
[DIR]  ftp://134.121.1.56/pub/gnu/superopt/
[DIR]  ftp://134.121.1.56/pub/gnu.OLD/superopt/
[DIR]  ftp://134.121.1.56/.snapshot/nightly.3/pub/gnu/superopt/
[DIR]  ftp://134.121.1.56/.snapshot/nightly.0/pub/gnu/superopt/
[DIR]  ftp://134.121.1.56/.snapshot/nightly.1/pub/gnu/superopt/
[DIR]  ftp://134.121.1.56/.snapshot/nightly.2/pub/gnu/superopt/
[DIR]  ftp://ftp.cc.keio.ac.jp/gnu/superopt/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.3/pub/gnu.OLD/superopt/
[DIR]  ftp://ftp.swin.edu.au/gnu/superopt/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/mirror/GNU/superopt/
[DIR]  ftp://ftp.uni-kassel.de/Mirrors/ftp.gnu.org/pub/gnu/superopt/
[DIR]  ftp://ftp.lanet.lv/pub/GNU/superopt/
[DIR]  ftp://sapi.vlsm.org/gnuftp/gnu/superopt/
[DIR]  ftp://ftp.ps.pl/dsk0/ftp.inria.fr/INRIA/Projects/Meta2/Scilab/gnucpan/gnu/superopt/
[DIR]  ftp://ftp.dc.aleron.net/pub/gnu/superopt/
[DIR]  ftp://128.197.27.19/pub/mirrors/ftp.gnu.ai.mit.edu/superopt/
[DIR]  ftp://128.237.157.9/gnu/superopt/
[DIR]  ftp://128.237.157.9/pub/gnu/superopt/
[DIR]  ftp://ftp.imag.fr/pub/archive/gnu/superopt/
[DIR]  ftp://ftp.isy.liu.se/mirror/gnu/superopt/
[DIR]  ftp://ftp.am-utils.org/mirrors/gnu/superopt/
[DIR]  ftp://ftp.win.tue.nl/pub/mirror/gnu/superopt/
[DIR]  ftp://ftp.newcastle.edu.au/pub/unix/gnu/superopt/
[DIR]  ftp://ftp.nctu.edu.tw/GNU/gnu/superopt/
[DIR]  ftp://ftp.zcu.cz/pub/gnu/superopt/
[DIR]  ftp://ftp.auckland.ac.nz/pub/gnu/superopt/
[DIR]  ftp://ftp.carnet.hr/misc/gnu/superopt/
[DIR]  ftp://ftp.zenez.com/pub/ftp.gnu.org/gnu/superopt/
[DIR]  ftp://ftp.kr.freebsd.org/pub/gnu/superopt/
[DIR]  ftp://ftp.demon.nl/disk3/gnu/superopt/
[DIR]  ftp://147.52.159.12/mirrors/gnu/superopt/
[DIR]  ftp://ftp.tomsknet.ru/pub/gnu/superopt/
[DIR]  ftp://ftp.nstu.ru/pub/mirrors/ftp.gnu.org/gnu/superopt/
[DIR]  ftp://ftp.uni-jena.de/pub/gnu/superopt/
[DIR]  ftp://ftp.uni-jena.de/pub/MIRROR.gnu/superopt/
[DIR]  ftp://ftp.cs.rpi.edu/mirrors/gnu/superopt/
[DIR]  ftp://ftp.informatik.uni-hamburg.de/pub/soft/gnu/superopt/
[DIR]  ftp://ftp.uni-wuppertal.de/pub/unix/gnu/superopt/