code: function(socket) {
      // Make note of the port numbers for any identd lookups
      // Nodejs < 0.9.6 has no socket.localPort so check this first
      if (typeof socket.localPort !== 'undefined') {
          this.identd_port_pair = socket.localPort.toString() + '_' + socket.remotePort.toString();
          global.clients.port_pairs[this.identd_port_pair] = this;
      }
  }
docs: When a socket connects to an IRCd
  May be called before any socket handshake are complete (eg. TLS)