4.FO is an extremely rare and valuable one number domain name which can be understood as simply "4" or as the acronym "4FO".
From the startup to the Forbes 500 company, a one letter domain is a very valuable asset endorsed by all innovative people.
n.nu (free website provider)
r.fm (Underground Evolved)
s.co (Startup America)
o.to (Nerd World Media)
a.co z.co k.co z.cn (Amazon)
a.im (Aol Instant Messenger)
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