In the On Web Connection database method, the third ($3) and fourth ($4) parameters can be checked for the IP address of the web client and server, respectively. If a value of "::1" is displayed for either parameter, it means that the IP is a loopback address. The loopback address is the equivalent of "127.0.0.1", which refers to the local machine (localhost). The "::1" IP usually comes up when testing web connections locally, when the URL domain of the web request is "127.0.0.1" or "localhost", for example.