IP Address Lookup.

An IP (Internet Protocol) address is a unique numerical label assigned to every device connected to a computer network. It serves two main purposes: identifying the host or network interface, and providing the location of the device in the network. IPv4 addresses are 32-bit numbers (e.g., 192.168.1.1), while IPv6 addresses are 128-bit (e.g., 2001:0db8::1) and were introduced to handle the depletion of IPv4 addresses.

You can find your public IP address by using HQCalc's IP Address Lookup tool and clicking "What's My IP?". Your device also has a private (local) IP address used within your home or office network. On Windows, type "ipconfig" in Command Prompt. On Mac/Linux, type "ifconfig" or "ip a" in Terminal. Your router assigns private IPs via DHCP, while your ISP assigns your public IP.

IPv4 uses 32-bit addresses, supporting about 4.29 billion unique addresses (e.g., 8.8.8.8). IPv6 uses 128-bit addresses, supporting approximately 340 undecillion addresses (e.g., 2001:db8::1). Because the internet has grown beyond the IPv4 address space, IPv6 was introduced in the late 1990s. Both protocols coexist today through a dual-stack setup, meaning most modern networks support both simultaneously.

IP geolocation is the process of mapping an IP address to a physical location, such as a country, city, region, or even latitude and longitude coordinates. It works by referencing databases maintained by regional internet registries (RIRs) and ISPs. Geolocation is used for content localization, fraud prevention, analytics, and network diagnostics. Accuracy typically ranges from country-level (very accurate, ~99%) to city-level (moderately accurate, ~70-80%).

An ASN (Autonomous System Number) is a unique identifier assigned to a network or collection of networks under a single administrative policy, typically managed by an ISP, university, or large organization. ASNs are used by the Border Gateway Protocol (BGP) to route internet traffic between different networks. For example, Google's ASN is AS15169, and Cloudflare's is AS13335. Knowing the ASN helps identify the organization controlling an IP address range.

Yes, performing an IP address lookup using publicly available geolocation data is entirely legal in India. Regional Internet Registries (RIRs) like APNIC publish IP ownership data publicly. However, using IP lookup to track individuals without consent, for harassment, or for unauthorized access can violate the Information Technology Act, 2000 (IT Act) and the proposed Digital Personal Data Protection Act, 2023. Always use IP lookup for legitimate, ethical purposes such as network diagnostics and cybersecurity.

IP geolocation accuracy varies by granularity. At the country level, accuracy is approximately 95-99%. At the city level, accuracy drops to roughly 60-80%. For precise street-level location, IP-based geolocation is unreliable. Factors affecting accuracy include VPNs, proxy servers, Tor exit nodes, mobile data networks (where the IP may resolve to the carrier's data center rather than the user's location), and how frequently the geolocation database is updated.

A public IP address is globally routable on the internet and assigned by your ISP. A private IP address is used within local networks and falls in reserved ranges defined by RFC 1918: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. Devices behind a router share a single public IP and use Network Address Translation (NAT) to communicate externally. Private IPs are not directly accessible from the internet, providing an additional security layer.

Yes, a VPN (Virtual Private Network) replaces your real public IP with the IP address of the VPN server. When you connect through a VPN, websites and IP lookup tools see the VPN server's IP — not yours. This can make your traffic appear to originate from a different country or city. However, VPN providers may log your activity, and sophisticated techniques like WebRTC leaks can sometimes expose your real IP even when using a VPN.

A static IP address never changes and is manually assigned to a device. It's typically used for servers, websites, and businesses that need a permanent, consistent address. A dynamic IP address is automatically assigned by a DHCP server (like your router) and can change each time you reconnect. Most home internet users have dynamic IPs, while businesses and hosting providers use static IPs for reliability. Your ISP charges more for static IP addresses.

WHOIS is a query-and-response protocol used to look up registration data for domain names and IP address blocks. For IP addresses, WHOIS data is maintained by Regional Internet Registries (RIRs) such as APNIC (Asia-Pacific), ARIN (North America), RIPE NCC (Europe), LACNIC (Latin America), and AFRINIC (Africa). WHOIS lookup reveals the organization that owns an IP block, contact information, and abuse reporting contacts. It complements geolocation lookup with official registration data.

Several IP ranges are reserved for special purposes. Private ranges (RFC 1918): 10.0.0.0–10.255.255.255, 172.16.0.0–172.31.255.255, 192.168.0.0–192.168.255.255. Loopback: 127.0.0.0–127.255.255.255 (localhost). Link-local: 169.254.0.0–169.254.255.255 (APIPA). Documentation: 192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24. Multicast: 224.0.0.0–239.255.255.255. These ranges never appear on the public internet and are not geo-locatable.

This is common and happens for several reasons. Mobile data users often see their carrier's data centre location rather than their physical location. ISPs may route traffic through a regional hub in a different city. VPNs and proxies show the server's location. Corporate networks may have centralized internet gateways. IPv6 addresses may resolve differently than IPv4. Geolocation databases are not always updated in real time, so recently reassigned IP blocks may still show old locations.

A proxy IP acts as an intermediary server between a user and the internet. When you use a proxy, websites see the proxy's IP rather than yours. Types include HTTP proxies (web traffic), SOCKS proxies (general traffic), transparent proxies (common on ISP networks), and anonymous proxies. Detection methods include checking ASN against known proxy/VPN providers, analyzing PTR (reverse DNS) records, cross-referencing with threat intelligence databases, and checking for hosting provider IPs vs residential IPs.

Reverse DNS (rDNS) maps an IP address back to a hostname using PTR (Pointer) records. While regular DNS resolves domain names to IPs, reverse DNS does the opposite. For example, the IP 8.8.8.8 resolves to dns.google. PTR records are commonly used for email server validation (to reduce spam), network diagnostics, logging, and security analysis. Not all IPs have PTR records configured, particularly consumer ISP addresses.

Yes, websites can use your IP address for tracking and profiling. They can determine your approximate location, ISP, and potentially correlate visits across sessions if your IP is static. Combined with browser fingerprinting, cookies, and other signals, IP addresses contribute to persistent user identification. Under India's proposed Digital Personal Data Protection (DPDP) Act, 2023, IP addresses may be considered personal data, giving users rights over their collection and use.

CGNAT (Carrier-Grade NAT) is a technique used by ISPs to share a single public IPv4 address among hundreds or thousands of customers, helping delay IPv4 address exhaustion. From an IP lookup perspective, CGNAT means multiple users share the same public IP, making it impossible to pinpoint a single user's device or even household. This is increasingly common on mobile networks in India and other regions with rapid mobile internet growth. CGNAT IPs typically resolve to the ISP's network center, not any individual user.

IP lookup is a passive, read-only process of retrieving publicly available registration and geolocation data about an IP address — it does not affect the device associated with that IP. IP tracking, by contrast, involves logging and correlating IP addresses over time to monitor user behaviour or identity. IP tracking by websites is generally passive and can be opted out of via VPNs. Active tracking, such as using malicious scripts to harvest IPs without consent, raises legal and ethical concerns in India under the IT Act, 2000.

The five RIRs that manage IP address allocation globally are: ARIN (American Registry for Internet Numbers) — serves North America; RIPE NCC — serves Europe, Middle East, and parts of Central Asia; APNIC (Asia-Pacific Network Information Centre) — serves Asia and Pacific, including India; LACNIC — serves Latin America and the Caribbean; and AFRINIC — serves Africa. India's IP addresses are allocated by APNIC and then sub-delegated to Indian ISPs like BSNL, Reliance Jio, and Airtel.

HQCalc's IP Address Lookup tool processes your lookup entirely client-side within your browser for display purposes and queries a third-party geolocation API only for the IP data you submit. HQCalc does not store or log the IP addresses you look up. No personal account or sign-up is required. Results are not shared with advertisers. The tool is entirely free. For complete privacy, you may use a VPN before visiting to avoid your own IP being associated with the query to the geolocation API.