All Tools
Free Network & Web Tools
12 free diagnostic tools — no signup required. Built for developers, sysadmins, and everyday users.
Internet Speed Test
Test your download speed, upload speed, and latency.
What Is My IP
Find your public IP address, location, ISP, and timezone instantly.
DNS Lookup
Query A, AAAA, MX, CNAME, TXT, and NS records for any domain.
Ping Test
Measure latency and packet loss to any host or IP address.
HTTP Header Checker
Inspect HTTP response headers for any URL.
Port Checker
Check if a TCP port is open or closed on any host.
WHOIS Lookup
Look up domain registration, expiry, and registrar information.
SSL Certificate Checker
Verify SSL certificate validity, expiry date, and issuer.
IP Geolocation
Look up the country, city, ISP, and timezone of any IP address.
Reverse DNS Lookup
Resolve an IP address back to its hostname using PTR records.
Subnet Calculator
Calculate network address, broadcast, and usable IP ranges.
Website Down Checker
Check if a website is down for everyone or just you.
Incident Triage (AI)
Paste any raw diagnostic output and get an instant AI diagnosis with next steps.