This API helps you to get registered service names and transport protocols port numbers.

Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP.
Service names are assigned on a first-come, first-served process.

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);

Reference: Internet Assigned Numbers Authority (IANA)
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