Inspect your public IP address (IPv4/IPv6), autonomous system (ASN), ISP, and calculate CIDR network boundaries, netmasks, and usable host ranges.
All formatting, parsing, decoding, and validation executes entirely within your browser using modern Web APIs and JavaScript. Your tokens, JSON payloads, regex inputs, and queries never leave your computer.
Understanding your public IP address, route origin, and networking boundaries is critical when setting up firewall rules, whitelisting API consumers, debugging VPC peering, or configuring DNS records.
DevRef's Online IP Tool provides real-time public IP detection, geographical location diagnostics, reverse DNS resolution, and a built-in CIDR subnet calculator. Easily determine network addresses, broadcast IPs, subnet masks, and total usable host capacities for any /8 through /32 IPv4 block.
The browser connects to lightweight edge endpoints that echo the TCP connection's source IP address back to your client. No personal information is stored or shared.
Classless Inter-Domain Routing (CIDR) represents an IP address and its associated network mask using a slash followed by the prefix bit count (e.g., /24 equals netmask 255.255.255.0 and provides 254 usable host addresses).
IP geolocation maps the physical location of the ISP's regional routing gateway or data center rather than your exact physical GPS coordinates.
Use curl for terminal-based HTTP requests, external IP verification, and header debugging.
Learn about X-Forwarded-For, X-Real-IP, and client proxy headers in modern web infrastructure.
Benchmark latency expectations for local, datacenter, and cross-continental network round trips.