800 IANA assigned this well-formed service name as a replacement for "mdbs_daemon". - System Port

800 is a System Port. Transport Protocol TCP UDP , 800 Service Name mdbs-daemon, Service Name Description: IANA assigned this well-formed service name as a replacement for "mdbs_daemon"..

Port	Protocol	Service Name	Description	Source
800	TCP UDP	mdbs-daemon	IANA assigned this well-formed service name as a replacement for "mdbs_daemon".	IANA
800	TCP	mdbs_daemon		IANA
800	UDP	mdbs_daemon		IANA
800	UDP		mdbe daemon,Official	wikipedia
800	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
800	TCP UDP	mdbs_daemon		bekkoame

Port	Service Name	Description
810	fcp-udp	FCP
1692	sstsys-lm	sstsys-lm
2609	system-monitor	System Monitor
3640	netplay-port1	Netplay Port 1
3731	smap	Service Manager
3838	sos	Scito Object Server
4259	vrml-multi-use	VRML Multi User Systems
4579		Unassigned
4833		Unassigned
5495		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