Twin directories of security.debian.org:

[DIR]  ftp://ftp.skynet.be/mirror1/security.debian.org/
[DIR]  ftp://ftp.rfc822.org/pub/mirror/security.debian.org/
[DIR]  ftp://ftp.ps.pl/dsk1/security.debian.org/
[DIR]  ftp://ftp.cvut.cz/mirrors/security.debian.org/
[DIR]  ftp://ftp.tudelft.nl/pub/Linux/security.debian.org/
[DIR]  ftp://galatea.rotfl.eu.org/mirror/security.debian.org/
[DIR]  ftp://ftp.hk.debian.org/debian-security/mirror/security.debian.org/
[DIR]  ftp://ftp.hk.debian.org/debian-security/skel/security.debian.org/
[DIR]  ftp://ftp.esat.net/mirrors/.3/security.debian.org/
[DIR]  ftp://ftp.ro.debian.org/pub/mirrors/security.debian.org/
[DIR]  ftp://ftp.ticklers.org/security.debian.org/
[DIR]  ftp://ftp.rz.uni-karlsruhe.de/pub/mirror/security.debian.org/
[DIR]  ftp://wt t0_Series004_z005_ch01.tif/.sda1/security.debian.org/
[DIR]  ftp://ftp.ps.pl/dsk0/security.debian.org/
[DIR]  ftp://195.238.1.7/mirror1/security.debian.org/