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Uptime and downtime with 99.86 % SLA

2025-11-27: It's always DNS. I built uptime mongers to monitor the DNS security issues that standard services ignore: parent zone delegation changes, stale DNSSEC signatures, expired RRSIGs. Get alerted when nameservers change at your registrar without your permission.

SLA & Uptime Calculator

How much downtime corresponds to your SLA?

%
(enter SLA level and hit the <enter> key)

SLA level of 99.86 % uptime/availability results in the following periods of allowed downtime/unavailability:

Daily 2m 0.96s
Weekly 14m 6.7s
Monthly 1h 1m 22s
Quarterly 3h 4m 4.9s
Yearly 12h 16m 20s

Direct link to the page with these results: uptime.is/99.86

The SLA calculations assume a requirement of continuous uptime (i.e. 24/7 all year long) with additional approximations as described in the source. uptime.is was originally implemented in newLISP, which had powered uptime and downtime calculations for more than a decade.

For convenience, there are special CEO and SEO friendly links for N nines:

three nines, four nines, five nines, six nines etc.