Free network & site tools
A suite of 13 free tools — DNS, SSL, headers, uptime, WHOIS and more. No sign-up, no limits.
Network
📡
Uptime & latency check
Check availability with a DNS/connect/TLS/TTFB latency breakdown.
🌐
DNS lookup
Resolve A, AAAA, CNAME, NS, MX and TXT records.
🔒
SSL/TLS certificate check
Inspect the certificate: issuer, expiry, SAN and chain.
📋
Response header check
View every HTTP response header a URL returns.
↪️
HTTP status & redirect tracer
Follow the redirect chain hop by hop to the final status.
🔎
Find a site's IP
Resolve a domain to its IPv4 / IPv6 addresses.
🔌
TCP port check
Test whether a TCP port is open on a host.
📍
What's my IP
Show the public IP address this request came from.