The operability of tref.is was checked 1 times during a period of 811 days, beginning on September 2, 2022. All checks as of November 21, 2024, revealed that tref.is was unavailable or experiencing problems. For 1 tests, tref.is was unavailable, representing 100.00% of checks performed, with the latest instance on September 2, 2022. The replies received indicate that as of November 21, 2024, there were no responses with error statuses. Tref.is replied in — seconds on September 2, 2022, contrasting with its average 0.001 seconds average.