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binkp is a protocol for transferring FidoNet mail over reliable connections.

Historically, Fidonet traffic was transferred mainly over serial (RS-232) modem connections which might not have error correction layer. These dial-up-oriented protocols to transfer Fidonet traffic like EMSI or Zmodem had to implement error-recovery. When the members of Fidonet have started to use TCP/IP to transfer Fidonet traffic, this error-recovery overhead became unnecessary. Assumption that the connection is reliable makes possible to eliminate error-checking and unnecessary synchronization steps, achieving both ease of implementation and performance improvement. The major advantage of binkp vs EMSI and Zmodem is achieved over connections with large delays and low bandwidth.

IANA (Internet Assigned Numbers Authority) has registered the port number 24554 for binkp when used over TCP/IP connections.

In 1996, Dima Maloff has released the first draft of the protocol specification, and the first mailer – binkd, that supported the new protocol.

In 1997, Argus mailer began to support binkp protocol.

In 1999, Dima Maloff, Nick Soveiko and Maxim Masiutin have submitted the protocol specification to the Fidonet Technical Standards Committee (FTSC), which has published the document as Fidonet Standards Proposal (FSP-1011).

In 2005, FTSC has assigned the Fidonet Technical Standard (FTS) status to binkp protocol, and has split the specification to four separate documents: Binkp/1.0 Protocol specification (FTS-1026), Binkp/1.0 optional protocol extension CRAM (FTS-1027), Binkp protocol extension Non-reliable Mode (FTS-1028) and Binkp optional protocol extension Dataframe Compression (FTS-1029).

• binkp specification (FSP-1011), published in 1999