12270 Unassigned - User Port

12270 is a User Port. Transport Protocol , 12270 Service Name , Service Name Description: Unassigned.

Port	Protocol	Service Name	Description	Source
12270			Unassigned	IANA

Port	Service Name	Description
50	re-mail-ck	Remote Mail Checking Protocol
512	exec	remote process execution; authentication performed using passwords and UNIX login names
1352	lotusnote	Lotus Note
2157	xnds	Xerox Network Document Scan Protocol
2601	discp-client	discp client
4832		Unassigned
6510	mcer-port	MCER Port
7052		Unassigned
7326	swx	The Swiss Exchange
7638		Unassigned

A port is an endpoint of communication in an operating system. While the term is also used for hardware devices, in software it is a logical construct that identifies a specific process or a type of service.

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);

The Well Known Ports are assigned by the IANA and on most systems can only be used by system (or root) processes or by programs executed by privileged users. Ports are used in the TCP [RFC793] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to unknown callers, a service contact port is defined. This list specifies the port used by the server process as its contact port. The contact port is sometimes called the "well-known port". To the extent possible, these same port assignments are used with the UDP [RFC768]. The range for well-known ports managed by the IANA is 0-1023.
DYNAMIC AND/OR PRIVATE PORTS Registered Ports are those from 1024 through 49151.
The Dynamic and/or Private Ports are those from 49152 through 65535