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.csnet
.csnet
is a
hostname
suffix
that was used for
identifying
nodes
in the
Computer Science Network
not directly connected to
the Internet
but
reachable
through
special
gateway
systems
. It was never
installed
as a
top-level domain
in the
Domain Name System
, but
parsed
in the
message
routing
logic
of mail
transport
agents. It was introduced in
1985
.