Twin directories of fyi:

[DIR]  ftp://ftp.rz.uni-karlsruhe.de/pub/mirror/ftp.ripe.net/rfc/fyi/
[DIR]  ftp://ftp.padua.org/pub/doc/rfc/fyi/
[DIR]  ftp://ftp.nstu.ru/pub/mirrors/ftp.ripe.net/rfc/fyi/
[DIR]  ftp://ftp.jate.u-szeged.hu/pub/comp_sci/rfc/fyi/
[DIR]  ftp://ftp.zcu.cz/pub/doc/rfc/fyi/
[DIR]  ftp://ftp.kfki.hu/pub/documents/rfc/fyi/
[DIR]  ftp://ftp.yzu.edu.tw/mirror/pub1/IETF/rfc/fyi/
[DIR]  ftp://ftp.saix.net/pub/rfc/fyi/
[DIR]  ftp://ftp.farlep.net/pub/doc/rfc/fyi/
[DIR]  ftp://144.122.144.177/pub/mirrors/ftp.ietf.org/rfc/fyi/
[DIR]  ftp://ftp.upc.es/pub/doc/rfc/fyi/
[DIR]  ftp://ftp.podgoretsky.pri.ee/Docs/Internet/Standards/fyi/
[DIR]  ftp://ftp.cesnet.cz/.vol/ftp.ripe.net/rfc/fyi/
[DIR]  ftp://ftp.cesnet.cz/.vol/ftp.ripe.net/fyi/
[DIR]  ftp://ftp.cosy.sbg.ac.at/pub/mirror/rfc/fyi/
[DIR]  ftp://ftp.di.uminho.pt/pub/rfcs/fyi/
[DIR]  ftp://ftp.radio-msu.net/pub/Mirrors/ftp.ietf.org/rfc/fyi/
[DIR]  ftp://ftp.rmt.ru/pub/Mirrors/ftp.ietf.org/rfc/fyi/
[DIR]  ftp://ftp.registro.br/rfc/fyi/
[DIR]  ftp://ftp.tm.informatik.uni-frankfurt.de/pub/doc/fyi/
[DIR]  ftp://ftp.wh8.tu-dresden.de/pub/rfc/fyi/
[DIR]  ftp://ftp.li.kernel.org/pub/.6/www.ietf.org/rfc/fyi/
[DIR]  ftp://ftp.sonycsl.co.jp/mirror/ftp.dit.co.jp/RFC/fyi/
[DIR]  ftp://ftp.jp.xemacs.org/pub/doc/RFC/fyi/
[DIR]  ftp://ftp.radio-msu.net/.1/ftp.ietf.org/rfc/fyi/
[DIR]  ftp://ftp.rmt.ru/.1/ftp.ietf.org/rfc/fyi/
[DIR]  ftp://ftp.esat.net/mirrors/.0/ftp.isi.edu/in-notes/fyi/
[DIR]  ftp://ftp.uniroma2.it/{A/doc/standard/fyi/
[DIR]  ftp://ftp.dit.co.jp/pub/fyi/
[DIR]  ftp://ftp.dit.co.jp/pub/rfc/fyi/
[DIR]  ftp://ftp.informatik.uni-mannheim.de/doc/rfc/fyi/
[DIR]  ftp://ftp.lanet.lv/pub/rfc/fyi/
[DIR]  ftp://ftp.zedz.net/pub/security/info/reference/ietf/rfc/fyi/
[DIR]  ftp://ftp.itojun.org/.mirror/ftp.ietf.org/rfc/fyi/
[DIR]  ftp://ftp.cru.fr/pub/reseau/RFCs/fyi/
[DIR]  ftp://ftp.happy.kiev.ua/pub/rfc/fyi/
[DIR]  ftp://ftp.uvsq.fr/pub/rfc/rfc/fyi/
[DIR]  ftp://ftp.tu-chemnitz.de/.SAN0/pub/documents/rfcs/fyi/
[DIR]  ftp://ftp.kame.net/.mirror/ftp.isi.edu/in-notes/fyi/
[DIR]  ftp://sunsite.mff.cuni.cz/MIRRORS/ftp.rfc-editor.org/in-notes/fyi/
[DIR]  ftp://ftp.csie.ncu.edu.tw/RFC/fyi/
[DIR]  ftp://ftp.gmd.de/RFCs/fyi/
[DIR]  ftp://sapi.vlsm.org/bebas/v07/org/rfc-editor/rfc-ed-all/fyi/
[DIR]  ftp://ftp.ausmac.net/disk1/security/info/reference/ietf/rfc/fyi/
[DIR]  ftp://ftp.demon.nl/disk3/Demon/mirrors/internic/rfc/fyi/
[DIR]  ftp://ftp.kreonet.re.kr/docs/in-notes/fyi/
[DIR]  ftp://ftp.bme.hu/documents/rfc/fyi/
[DIR]  ftp://ftp.nordu.net/in-notes/fyi/
[DIR]  ftp://ftp.cse.buffalo.edu/mirror/Network/rfc/fyi/
[DIR]  ftp://ftp.mimuw.edu.pl/mirror/ftp.rfc-editor.org/fyi/