From December 21, 2021, onward for the next 1 232 days, kaiyoukan.jp was checked for availability 8 times. Out of all the tests carried out, kaiyoukan.jp was accessible 8 times, the last instance being April 7, 2025, when a code 200 was received. Based on checks made as of May 6, 2025, kaiyoukan.jp did not experience any unavailability incidents. As all of the responses received as of May 6, 2025, show, none of them have an error status. Records indicate a 2.181 seconds kaiyoukan.jp response time on April 7, 2025, compared to 2.213 seconds on average.