6 tests were conducted on the operability of isi.nl over the 1 994 days starting on June 19, 2019. In the course of 6 operational instances, isi.nl's last uptime on June 19, 2019, returned a code 200, across conducted tests. As of December 4, 2024, there had been no instances of isi.nl being unavailable during the checks conducted. All responses obtained as of December 4, 2024, have been reported as having no error status codes. On June 19, 2019, isi.nl's response time was 1.005 seconds, with an average response time of 1.140 seconds.