11 tests have been conducted on mc21.ru's availability in the 1 500 days since February 22, 2021. Mc21.ru was accessible 11 times, the last instance being on November 15, 2022, when a code 200 was received, out of the total checks performed. As of April 2, 2025, no tests that were performed showed any instances of mc21.ru being unavailable. As of April 2, 2025, no error status code was noted in any of the responses that were received. Comparison data from November 15, 2022, indicates that mc21.ru responded in 0.549 seconds, contrasting the 0.574 seconds average.