Port 174 MAILQ - System Port | Service Name:mailq

Port 174 is a System Port. Transport Protocol TCP UDP , Port 174 Service Name mailq, Service Name Description: MAILQ.

Port	Protocol	Service Name	Description	Source
174	TCP UDP	mailq	MAILQ	IANA
174	TCP UDP	mailq	MAILQ	bekkoame

Port	Service Name	Description
1542	gridgen-elmd	gridgen-elmd
2304	attachmate-uts	Attachmate UTS
3128	ndl-aas	Active API Server Port
3600	trap-daemon	text relay-answer
4324	balour	Balour Game Server
7567		Unassigned
7568		Unassigned
9123	grcp	Global Relay compliant instant messaging protocol
10900		Unassigned
11521		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