WhatsMyIPAdr

An IP address (Internet Protocol address) is a unique numerical label assigned to each device connected to a computer network. It serves as an identifier for your device and allows it to communicate with other devices on the internet. Think of it like a home address — it tells the internet where to deliver data meant for you.

IPv4 uses 32-bit addresses (e.g., 192.168.1.1) and can support about 4.3 billion unique addresses. IPv6 uses 128-bit addresses (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334) and can support a virtually unlimited number of addresses. IPv6 was created to address the exhaustion of available IPv4 addresses as the internet grew.

Most ISPs assign dynamic IP addresses that change periodically. This happens when you restart your router, reconnect to your network, or when your ISP's DHCP lease expires. If you need a consistent IP address, you can request a static IP from your ISP — though this usually comes at an extra cost.

An IP address can provide approximate location information — typically at the city or region level. However, it cannot pinpoint your exact physical address. Geolocation data is based on your ISP's server locations, which may not always match where you physically are. Law enforcement can obtain more precise location data via a court order to your ISP, but ordinary third parties cannot.

An IP blocklist checker (also known as a DNSBL checker) verifies if your IP address appears on any known spam or threat blocklists. This is crucial for maintaining email deliverability and identifying potential security issues. Our tool checks multiple DNSBL services including Spamhaus, SORBS, and SpamCop. If your IP is listed, emails you send may be rejected or flagged as spam.

A port checker helps you verify if a specific port on your network is open and accessible from the internet. Ports are like "doors" on your IP address — each one can allow or block a specific type of traffic. This tool is useful for configuring servers, setting up remote access, gaming, or troubleshooting why a particular service isn't reachable.

You can protect your IP address by using a VPN (Virtual Private Network), which routes your traffic through encrypted servers and masks your real IP. Other options include proxy servers and the Tor network for greater anonymity. On public Wi-Fi, a VPN is especially important as it prevents others on the same network from intercepting your data.

Your user agent string contains information about your browser name and version, operating system, and device type. This data is automatically sent to every website you visit and helps sites optimise content for your specific setup. It can also be used in browser fingerprinting — a technique that identifies users even without cookies.

Yes, WhatsMyIPAdr is completely free to use. All our tools — IP lookup, geolocation, blocklist checking, port checking, browser fingerprinting, and user agent analysis — are available at no cost, with no account required.

No. We do not store or log your IP address or any personal information. All lookups are performed in real-time and no data is retained after you close the page. Our site uses only minimal cookies for functionality (like theme preferences). Please see our Privacy Policy for full details.

WhatsMyIPAdr is free to use and supported by advertising. We use Google AdSense to display relevant ads, which helps cover our server and development costs. Google may use cookies to show you personalised ads based on your browsing history. You can opt out of personalised advertising at any time via Google Ads Settings.