Twin directories of fyi:

[DIR]  ftp://ftp.tm.informatik.uni-frankfurt.de/pub/doc/fyi/
[DIR]  ftp://ftp.oswego.edu/faculty/zpeng/webfolder/fyi/
[DIR]  ftp://ftp.mimuw.edu.pl/mirror/ftp.rfc-editor.org/fyi/
[DIR]  ftp://ftp.sonycsl.co.jp/mirror/ftp.dit.co.jp/RFC/fyi/
[DIR]  ftp://ftp.eenet.ee/doc/rfc/fyi/
[DIR]  ftp://ftp.fi.upm.es/pub/docs/rfc/fyi/
[DIR]  ftp://ftp.uni-frankfurt.de/pub/ietf/rfc/fyi/
[DIR]  ftp://ftp.kfki.hu/pub/documents/rfc/fyi/
[DIR]  ftp://ftp.registro.br/rfc/fyi/
[DIR]  ftp://ftp.ripe.net/mirrors/rfc/fyi/
[DIR]  ftp://ftp.farlep.net/pub/doc/rfc/fyi/
[DIR]  ftp://ftp.kreonet.re.kr/docs/in-notes/fyi/
[DIR]  ftp://ftp.fagskolen.gjovik.no/pub/rfc/fyi/
[DIR]  ftp://ftp.isi.edu/in-notes/fyi/
[DIR]  ftp://ftp.cosy.sbg.ac.at/pub/mirror/rfc/fyi/
[DIR]  ftp://ftp.wh8.tu-dresden.de/pub/rfc/fyi/
[DIR]  ftp://ftp.jate.u-szeged.hu/pub/comp_sci/rfc/fyi/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/mirror/rfc/fyi/
[DIR]  ftp://ftp.ut.ee/documents/RFC/fyi/
[DIR]  ftp://ftp.lanet.lv/pub/rfc/fyi/
[DIR]  ftp://ftp.sztaki.hu/pub/nic/rfc/fyi/
[DIR]  ftp://ftp.sztaki.hu/pub/nic/fyi/
[DIR]  ftp://ftp.dntis.ro/pub/.1/ftp.rfc-editor.org/rfc/fyi/
[DIR]  ftp://ftp.apnic.net/public/ietf/ietf-mirror/fyi/
[DIR]  ftp://ftp.lf.net/pub/comm/internet/fyi/
[DIR]  ftp://ftp.ietf.org/ietf-online-proceedings/RFCs_with_extra_files/fyi/
[DIR]  ftp://ftp.ietf.org/rfc/fyi/
[DIR]  ftp://ftp.cbn.net.id/mirror/RFC/fyi/
[DIR]  ftp://ftp.nnov.net/pub/docs/RFC/fyi/
[DIR]  ftp://ftp.ps.pl/dsk0/ftp.nordu.net/in-notes/fyi/
[DIR]  ftp://ftp.dc.aleron.net/pub/rfc/in-notes/fyi/
[DIR]  ftp://ftp.cse.buffalo.edu/mirror/Network/rfc/fyi/
[DIR]  ftp://ftp.imag.fr/pub/archive/IETF/rfc/fyi/
[DIR]  ftp://ftp.linuxforum.hu/Documentations/RFC/fyi/
[DIR]  ftp://ftp.informatik.uni-mannheim.de/doc/rfc/fyi/
[DIR]  ftp://ftp.informatik.uni-mannheim.de/doc/rfc.old/fyi/
[DIR]  ftp://ftp.newcastle.edu.au/pub/rfc/fyi/
[DIR]  ftp://ftp.zcu.cz/pub/doc/rfc/fyi/
[DIR]  ftp://ftp.dfn.de/pub/doc/rfc/fyi/
[DIR]  ftp://ftp.nordu.net/in-notes/fyi/
[DIR]  ftp://ftp.int-evry.fr/mirror4/ftp.rfc-editor.org/rfc-ed/fyi/
[DIR]  ftp://ftp.int-evry.fr/mirror1/ftp.rfc-editor.org/rfc-ed/fyi/
[DIR]  ftp://ftp.botik.ru/pub/doc/rfc/fyi/
[DIR]  ftp://ftp.euro.net/pub/mirrors/RFC/fyi/
[DIR]  ftp://ftp.chello.nl/pub/rfc/fyi/
[DIR]  ftp://ftp.dlut.edu.cn/pub1/Documents/RFC/fyi/
[DIR]  ftp://ftp.zenez.com/pub/rfc/fyi/
[DIR]  ftp://ftp.tsua.net/pub/Docs/fyi/
[DIR]  ftp://ftp.demon.nl/disk3/Demon/mirrors/internic/rfc/fyi/
[DIR]  ftp://147.52.159.12/mirrors/ftp.ietf.org/rfc/fyi/