From March 13, 2021, through the following 1 350 days, 1 availability checks of fourplus.bg were conducted. Through 1 operational instances across all conducted checks, fourplus.bg affirmed its latest uptime on March 13, 2021, by returning a code 200. As of November 22, 2024, testing indicates that there had been no instances of inoperability for fourplus.bg. It has been confirmed through all received replies that, as of November 22, 2024, no reply has an error status. At 0.823 seconds on March 13, 2021, fourplus.bg's response differed from the 0.823 seconds average.