Data from the 1 247 day period starting on June 28, 2021, indicates 3 analyses of the operation of istu.jp. During the 1 instances of operability out of all conducted tests, istu.jp's last recorded uptime on November 22, 2024, returned a code 200. No non-functionality was found for istu.jp across reviews done as of November 26, 2024. Out of 2 responses that encountered errors, the most recent one, coded as 403, was recorded on August 27, 2021. Istu.jp responded on November 22, 2024, in 3.859 seconds, compared to the average response time of 1.763 seconds.