WEB & NETWORKTOOLS
Check IPs, DNS records, open ports, HTTP headers and more — instantly and for free.
What Is My IP
Find your public IP address instantly.
DNS Lookup
Lookup A, AAAA, MX, NS, TXT records.
Ping Test
Test host latency and reachability.
HTTP Header Checker
Inspect response headers from a URL.
Port Checker
Check if a TCP port is open on a host.
Whois Lookup
Get domain registration and ownership info.
SSL Certificate Checker
Inspect SSL/TLS certificate details.
IP Geolocation
Find the location of any IP address.
Reverse DNS Lookup
Resolve an IP address to a hostname.
Subnet Calculator
Calculate subnet ranges and CIDR details.
Internet Speed Test
Test your download, upload speed and ping.
From the Blog
Hunting Shadow APIs: Finding Undocumented Endpoints
Learn how to use port scanning and fingerprinting to discover Shadow APIs and secure your web infrastructure from hidden vulnerabilities.
The Silent Performance Killer: IPv6 Fallback Latency Explained
Is your website lagging for some users? Discover how IPv6 fallback latency slows down your web apps and how to fix it.
Beyond the Ping: Fix Packet Loss with Traceroute and MTR
Stop guessing where your connection is dropping. Learn how to use MTR and Traceroute to find packet loss in complex BGP routes.