getpeername

getpeername SOCKET

Returns the packed sockaddr address of the other end of the SOCKET connection.

use Socket;
my $hersockaddr    = getpeername($sock);
my ($port, $iaddr) = sockaddr_in($hersockaddr);
my $herhostname    = gethostbyaddr($iaddr, AF_INET);
my $herstraddr     = inet_ntoa($iaddr);

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https://perldoc.perl.org/5.24.0/functions/getpeername.html