getpeername - Perldoc Browser

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#getpeername SOCKET

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

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