Free website and domain tools
Quick, accurate checks for your website, domain, DNS, SSL and servers. Use them as often as you like, then turn on continuous monitoring when you are ready.
Website Uptime Check
Check if a website is online right now, see its HTTP status and response time, and test USA network latency.
Open toolDNS Lookup
See every public DNS record for a domain, including mail (MX), SPF and nameservers, checked live from Cloudflare and Google resolvers.
Open toolDomain WHOIS Lookup
Find who a domain is registered with, when it was created, when it expires and which nameservers it uses, from the official registry (RDAP).
Open toolSSL Certificate Checker
Check a website's SSL certificate: whether browsers trust it, when it expires, who issued it, which names it covers and the certificate chain.
Open toolHTTP Headers & Security Check
See the HTTP response headers a website sends, how fast it answered, and a security grade based on six important security headers.
Open toolOpen Port Checker
Check whether a common service port (web, mail, SSH, database) on a public server accepts connections from the internet.
Open tool