Free professional-grade DNS and network tools. No signup required.
DNS Tools
Check if DNS changes propagated globally across 25 locations in real time.
Look up all DNS records for any domain — A, AAAA, CNAME, MX, NS, TXT, SOA.
Complete list of public DNS servers by country. Find the fastest DNS for your location.
Check mail exchanger records. Verify email routing is configured correctly.
Validate your SPF record to prevent email spoofing.
Verify DKIM signatures and email authentication setup.
Check your DMARC policy to protect from email phishing.
Find the authoritative nameservers for any domain.
Find the hostname associated with an IP using PTR records.
Network Tools
Find the location, ISP, and details for any IP address or domain.
Instantly find your public IP address, location, and ISP details.
Test response time of any server from multiple global locations.
Check if a specific port is open or closed on any server.
Inspect HTTP response headers. Debug caching and security headers.
Domain Tools
Verify your SSL certificate is valid and check expiry dates.
Look up domain registration details, ownership, and expiry dates.
Check if your domain or IP is on major email blacklists.
Find the Autonomous System Number for any IP or network.