Internet users rarely recognize their Internet environment as a measured value. In this paper, we measured an end-user Internet environment by “iNonius Speed Test”, a web service that measures the Internet quality of users with IPv4/Ipv6 dual stack, and analyzed that data. The result of the measurement service shows IPv6 is higher quality than IPv4, and the data fluctuates according to time of day, and the range of fluctuation is more prominent than the existing tool.