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Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →

instance method

BasicSocket#getsockname

basicsocket.getsockname => sockaddr

Returns the local address of the socket as a sockaddr string.

Example
TCPServer.open("127.0.0.1", 15120) {|serv|
  p serv.getsockname #=> "\x02\x00;\x10\x7F\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
}

If Addrinfo object is preferred over the binary string, use BasicSocket#local_address.