Uptime and downtime with 95 % 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 95 % uptime/availability results in the following periods of allowed downtime/unavailability:

Daily
1h 12m 0s
Weekly
8h 24m 0s
Monthly
1d 12h 31m 27s
Quarterly
4d 13h 34m 22s
Yearly
18d 6h 17m 28s

Direct link to the page with these results: uptime.is/95

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.