There have been 4 tests conducted on lookupbyisbn.com's uptime in the 1 384 days starting June 18, 2021, up until today. Lookupbyisbn.com was online 4 times out of all checks performed, as shown by the code 200 response on the latest test conducted on February 17, 2025. In all evaluations conducted as of April 2, 2025, lookupbyisbn.com had no recorded incidents of inaccessibility. Every response received affirms that, as of April 2, 2025, no error statuses have been detected. Lookupbyisbn.com's February 17, 2025, response time of 0.573 seconds differed from its 2.409 seconds average response time.