Free tools

Free tools for uptime and reliability.

Free tools for site reliability: work out the downtime an SLA allows, check an SSL certificate, look up DNS records and test a host from every region. No signup.

• SLA uptime calculator

  Turn an uptime target into allowed downtime per day, month and year, or an outage into uptime.

• SSL certificate checker

  See whether a certificate is trusted, matches the hostname and when it expires.

• DNS lookup

  Look up A, AAAA, CNAME, MX, NS, TXT, SOA and CAA records with their TTLs.

• Network check

  Run an HTTP, ping, DNS or TCP check from every region and compare the results.