Free tools
Free uptime tools
Calculators and checks for everyday uptime work. Free, no signup required.
$HTTP_PROTOCOL = (isset($_SERVER['HTTPS']) && ($_SERVER['HTTPS'] == 'on' || $_SERVER['HTTPS'] == 1)) || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') ? 'https://' : 'http://'; $SITE_URL = $HTTP_PROTOCOL . $_SERVER['SERVER_NAME'] . '/'; ?>
Free tools
Calculators and checks for everyday uptime work. Free, no signup required.
More tools are on the way.
Turn 99.9% into real minutes of downtime per day, month and year, or convert an outage into the uptime it cost you.
Build a crontab schedule in clicks, decode any cron expression into plain English, and preview the next run times.
See every record for a domain from one resolver: A, AAAA, MX, TXT, CNAME, NS, SOA and CAA, plus reverse DNS for an IP.
Compare one record across Google, Cloudflare, DNS.SB and AliDNS at once to confirm a DNS change has propagated everywhere.
Validate your SPF record and count its DNS lookups against the limit of 10 that quietly breaks email delivery.
Look up your DMARC record, read your enforcement policy, and see where your aggregate reports are sent.
Look up a DKIM record by selector and confirm the signing key is published and has not been revoked.
Check from the outside whether a website is down for everyone or just for you, and see live status for popular services.
Paste up to 25 URLs and see the HTTP status code, full redirect chain and response headers for each one at once.
Query one record type at a time for any domain.
Find the IPv4 address a domain points to.
Find the IPv6 address a domain points to.
Check the alias a host name points to.
Check a domain's mail servers and their priorities.
Find the authoritative name servers for a domain.
Read the SPF, DKIM, DMARC and verification records.
Read the start-of-authority record and zone timers.
Find the host and port for a service record.
See which authorities may issue SSL certificates.
Turn an IP address into its host name via PTR.
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