Port 992 telnet protocol over TLS/SSL - System Port

Port 992 is a System Port. Transport Protocol TCP UDP , Port 992 Service Name telnets, Service Name Description: telnet protocol over TLS/SSL.

Port	Protocol	Service Name	Description	Source
992	TCP UDP	telnets	telnet protocol over TLS/SSL	IANA
992	TCP UDP		TELNET protocol over TLS/SSL,Official	wikipedia
992	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
992			Snape	simovits.com
992	TCP UDP	telnets	telnet protocol over TLS/SSL	bekkoame

Port	Service Name	Description
1775		Unassigned
1851	ctcd	ctcd
2382	ms-olap3	Microsoft OLAP
2752	rsisysaccess	RSISYS ACCESS
2922	cesdcdtrn	CESD Contents Delivery Data Transfer
2942	sm-pas-5	SM-PAS-5
3000	hbci	HBCI
3051	galaxy-server	Galaxy Server
3790	quickbooksrds	QuickBooks RDS
3816	sunlps-http	Sun Local Patch Server

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