1027 IPv6 Behind NAT44 CPEs - User Port

1027 is a User Port. Transport Protocol UDP , 1027 Service Name 6a44, Service Name Description: IPv6 Behind NAT44 CPEs.

Port	Protocol	Service Name	Description	Source
1027	UDP	6a44	IPv6 Behind NAT44 CPEs	IANA
1027	TCP		Reserved	IANA
1027	UDP		Native IPv6 behind IPv4-to-IPv4 NAT Customer Premises Equipment (6a44),Official	wikipedia
1027			Clandestine, DataSpy Network X, KiLo, UandMe	simovits.com
1027	TCP UDP		Unassigned	bekkoame
1027	TCP UDP		ABCHlp	bekkoame

Port	Service Name	Description
64	covia	Communications Integrator (CI)
509	snare	snare
2000	cisco-sccp	Cisco SCCp
2306	tappi-boxnet	TAPPI BoxNet
4502	a25-fap-fgw	A25 (FAP-FGW)
4793		Unassigned
4924		Unassigned
5233	enfs	Etinnae Network File Service
5290		Unassigned
5297		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