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Port 270

Port
Protocol
Service Name
Description
Source
270
TCP 
Reserved
IANA
270
 UDP
gist
Q-mode encapsulation for GIST messages
IANA

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A port is an application-specific or process-specific software construct serving as a communications endpoint in a computer's host operating system.

Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP.

Port numbers are assigned in various ways, based on three ranges: System Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Private Ports (49152-65535);