The number of uptime checks of pnas.org performed over the past 1 388 days, starting January 30, 2021, stands at 4. Out of every uptime test completed, pnas.org was accessible 3 times, most recently evidenced by the 200 status response on February 13, 2023. All tests conducted as of November 19, 2024, confirmed that pnas.org did not experience any periods of inoperability. The most recent error, recorded on November 18, 2024, carried code 403 within the total of 1 responses with errors. Against an average of 1.132 seconds, 0.059 seconds was pnas.org's response time on November 18, 2024.