Twin directories of 21:

[DIR]  ftp://ftp.ip.pt/pub/php/backend/notes/21/
[DIR]  ftp://ftp.crihan.fr/mirrors/www.php.net/backend/notes/21/
[DIR]  ftp://ftp.nfsi.pt/pub/php/backend/notes/21/
[DIR]  ftp://69.22.137.28/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://69.22.137.43/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://64.86.106.78/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://64.86.106.88/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://140.90.33.31/pub/data/nccf/com/sref/prod/sref.20080716/21/
[DIR]  ftp://140.90.33.41/pub/data/nccf/com/sref/prod/sref.20080716/21/
[DIR]  ftp://140.90.33.31/pub/data/nccf/com/sref/prod/sref.20080717/21/
[DIR]  ftp://140.90.33.41/pub/data/nccf/com/sref/prod/sref.20080717/21/
[DIR]  ftp://205.177.95.156/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://205.177.95.161/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://205.177.95.166/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://64.86.106.108/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://69.22.137.58/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://69.22.137.63/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://ftp.meteo.psu.edu/pub/bufkit/RUC/21/
[DIR]  ftp://ftp.si.kernel.org/mirrors/php/backend/notes/21/
[DIR]  ftp://205.177.95.131/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://ftp.stack.nl/mirrors/.www/php/backend/notes/21/
[DIR]  ftp://ftp.netis.ru/pub/source/phpweb/backend/notes/21/
[DIR]  ftp://ftp.si.kernel.org/mirrors/kernel/pub/scm/linux/kernel/git/ak/linux-acpi-merge-2.6/objects/21/
[DIR]  ftp://ftp.si.kernel.org/mirrors/kernel/pub/scm/linux/kernel/git/mfasheh/ocfs2.git/objects/21/
[DIR]  ftp://204.152.191.5/pub/scm/linux/kernel/git/ak/linux-acpi-merge-2.6/objects/21/
[DIR]  ftp://204.152.191.5/pub/scm/linux/kernel/git/mfasheh/ocfs2.git/objects/21/
[DIR]  ftp://ftp.si.kernel.org/mirrors/kernel/pub/scm/linux/kernel/git/x86/linux-2.6-tip.git/objects/21/
[DIR]  ftp://204.152.191.5/pub/scm/linux/kernel/git/x86/linux-2.6-tip.git/objects/21/
[DIR]  ftp://204.152.191.37/pub/scm/linux/kernel/git/dwmw2/kernel-headers.git/objects/21/
[DIR]  ftp://ftp.bg.debian.org/debian-www/debian.org/News/weekly/2004/21/
[DIR]  ftp://ftp.bg.debian.org/debian-www/debian.org/News/weekly/2005/21/
[DIR]  ftp://ftp.at.debian.org/www.debian.org/News/weekly/2004/21/
[DIR]  ftp://ftp.at.debian.org/www.debian.org/News/weekly/2005/21/
[DIR]  ftp://ftp.bg.debian.org/debian-www/debian.org/News/weekly/2002/21/
[DIR]  ftp://ftp.bg.debian.org/debian-www/debian.org/News/weekly/2003/21/
[DIR]  ftp://ftp.at.debian.org/www.debian.org/News/weekly/2002/21/
[DIR]  ftp://ftp.at.debian.org/www.debian.org/News/weekly/2003/21/
[DIR]  ftp://ftp.bg.debian.org/debian-www/debian.org/News/weekly/1999/21/
[DIR]  ftp://ftp.bg.debian.org/debian-www/debian.org/News/weekly/2000/21/
[DIR]  ftp://ftp.bg.debian.org/debian-www/debian.org/News/weekly/2001/21/
[DIR]  ftp://ftp.at.debian.org/www.debian.org/News/weekly/1999/21/
[DIR]  ftp://ftp.at.debian.org/www.debian.org/News/weekly/2000/21/
[DIR]  ftp://ftp.at.debian.org/www.debian.org/News/weekly/2001/21/
[DIR]  ftp://85.18.206.106/pub/scm/linux/kernel/git/geoff/ps3-linux-patches.git/objects/21/
[DIR]  ftp://ftp.si.kernel.org/mirrors/kernel/pub/scm/linux/kernel/git/geoff/ps3-linux-patches.git/objects/21/
[DIR]  ftp://67.133.239.48/public/japanese/products/symantec_enterprise_security_architecture/21/
[DIR]  ftp://204.152.191.37/pub/scm/linux/kernel/git/geoff/ps3-linux-patches.git/objects/21/
[DIR]  ftp://204.152.191.5/pub/scm/linux/kernel/git/geoff/ps3-linux-patches.git/objects/21/
[DIR]  ftp://ftp.bononia.it/pub/scm/linux/kernel/git/geoff/ps3-linux-patches.git/objects/21/
[DIR]  ftp://ftp.si.kernel.org/mirrors/kernel/pub/scm/linux/kernel/git/torvalds/linux-2.6.git/objects/21/