Check it now.

13 free checks that run from the same code as a monitor, and an uptime calculator. No account, one run, nothing kept about you.

Every tool

SSL checkerCheck an SSL certificate's expiry, chain and hostnameRUNS A CHECK Domain expiry checkerWhen does this domain expire?RUNS A CHECK DNS lookupLook up a DNS record from the internetRUNS A CHECK Mail checkCheck MX, SPF, DKIM, DMARC and 4 blocklistsRUNS A CHECK HTTP checkerCheck a URL's status, redirects and latencyRUNS A CHECK Port checkerIs this port open from the internet?RUNS A CHECK Ping testPing a host from the internetRUNS A CHECK Status page readerWhat does their status page say right now?RUNS A CHECK SPF checkerCheck a domain's SPF recordRUNS A CHECK DKIM checkerIs this DKIM selector publishing a key?RUNS A CHECK DMARC checkerCheck a domain's DMARC policyRUNS A CHECK Blocklist checkerIs my mail server on a blocklist?RUNS A CHECK Subdomain finderFind every subdomain of a domainREADS THE LOGS Uptime calculatorHow much downtime is 99.9% uptime?ARITHMETIC

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