METHOD FOR DETECTING NUMBER OF SELECTED DEVICES AMONG PLURALITY OF CLIENT TERMINALS ON PRIVATE NETWORK USING SAME PUBLIC IP BY WEB SERVER PROVIDED WITH ADDITIONAL NON-SPECIFIED DOMAIN NAME FROM INTERNET ACCESS REQUEST TRAFFIC OF CLIENT TERMINAL MAKING REQUEST FOR INTERNET ACCESS, AND SELECTIVE DETECTION SYSTEM FOR DEVICE IN STATE IN WHICH PUBLIC IP IS SHARED

摘要

The present invention relates to: a method for detecting the number of selected devices by classifying types of devices among a plurality of client terminals on a private network using the same public IP, by using a detecting/blocking web server to which HTTP request messages of client terminals are redirected, and transmitting, to the client terminals, HTTP response messages for redirecting selected devices to the detecting/blocking web server by a dummy URL so as to count DNS request messages to the detecting/blocking web server generated when the client terminals re-access the detecting/blocking web server, thereby detecting multi-access subscribers exceeding allowed lines when the plurality of client terminals sharing one public IP access an Internet service network by using an IP sharer through an IP address conversion; and a detection system for performing the method.