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0 TCP UDP RESERVED Technique sometimes used in network programming.
More 1 TCP TCPMUX - TCP Port Service Multiplexer Allows any of multiple TCP services to be contacted by their service name. RFC 1078.
Trojans - Sockets des Troie
2 TCP Management Utility Formerly used by Compressnet product for compression of TCP WAN traffic. 3 TCP Compression Process Formerly used by Compressnet product for compression of TCP WAN traffic. 4 TCP UDP Unassigned 5 TCP UDP Remote Job Entry Mechanism for executing batch jobs remotely. RFC 407 6 TCP UDP Unassigned 7 TCP UDP Echo When enabled for debugging purposes, returns to the source any data received. RFC 862 8 TCP UDP Unassigned 9 TCP UDP Discard When enabled for debugging purposes, throws away any data received with no response sent. RFC 863