How to Use the IP Address & WHOIS Intelligence Tool
An Internet Protocol (IP) address serves as the foundational numeric identifier for every computer, server, router, and IoT device communicating across the global internet. Whether you are troubleshooting firewall rules, investigating brute-force security alerts, configuring DNS routing, or verifying server locations, this tool provides instant, comprehensive network telemetry.
Enter IP or Domain
Type any valid IPv4 address (e.g., 8.8.8.8), IPv6 address, or hostname (e.g., example.com). Leaving it blank or clicking "Detect My IP" immediately resolves your current public connection.
Analyze ISP & Routing
Instantly inspect the upstream Internet Service Provider (ISP), the Autonomous System Number (ASN), BGP routing origin, and reverse DNS hostname.
Verify Geolocation
View geographic positioning including continent, country flag, state/region, city, postal code, and local timezone offset for accurate geofencing or compliance audits.
IPv4 vs IPv6: Understanding the Core Differences
Internet Protocol version 4 (IPv4) was defined in 1981 by RFC 791 and uses a 32-bit address space, yielding approximately 4.29 billion unique addresses. Because of rapid global smartphone adoption, cloud computing, and IoT devices, the global pool of unallocated IPv4 addresses was fully exhausted by IANA in 2011.
Internet Protocol version 6 (IPv6) solves IPv4 exhaustion permanently with a 128-bit address space, supporting 3.4 × 10^38 unique addresses. IPv6 addresses are written in eight groups of four hexadecimal digits separated by colons (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334).
| Feature | IPv4 | IPv6 |
|---|---|---|
| Address Length | 32 bits (4 bytes) | 128 bits (16 bytes) |
| Address Pool | ~4.3 Billion | 340 Undecillion |
| Notation | Dotted-decimal (192.0.2.1) | Hexadecimal with colons (2001:db8::1) |
| Header Size | Variable (20–60 bytes) | Fixed (40 bytes, faster processing) |
| IPsec Support | Optional add-on | Native built-in architectural support |
Public vs Private IP Addresses (RFC 1918)
Not all IP addresses route across the public internet. The Internet Engineering Task Force (IETF) reserved specific IPv4 address blocks in RFC 1918 for private local area networks (LANs), internal VPCs, and home Wi-Fi routers. If you attempt to look up an RFC 1918 IP address, it cannot be geolocated because it is not globally routable.
How Autonomous Systems (ASN) and BGP Routing Function
The internet is not a single unified network; it is a global collective of over 100,000 independently operated networks known as Autonomous Systems (AS). Each Autonomous System is assigned an ASN by regional registries (ARIN in North America, RIPE NCC in Europe, APNIC in Asia).
Networks communicate routing paths with each other using the Border Gateway Protocol (BGP). When an IP address appears in our lookup tool with AS15169 Google LLC or AS13335 Cloudflare, BGP routers across the globe know to route packets addressed to that IP toward the designated provider's edge routers.
Reverse DNS (PTR) Records & Email Security
While standard forward DNS maps a domain name to an IP address (servercare360.com → 192.0.2.1), Reverse DNS (rDNS) performs the inverse operation, querying an IP to find its canonical domain via a PTR record in the in-addr.arpa zone.
When your Linux mail server (Exim, Postfix, Sendmail) connects to Gmail or Microsoft 365 on port 25, the receiving server executes a reverse lookup on your sending IP address. If your IP lacks a valid PTR record matching your hostname, your mail will be rejected with an SMTP 550 error code or routed directly to spam.