What is an IP Address?
An IP address is a unique string of numbers (IPv4) or numbers and letters (IPv6) that identifies a device on a network, like an address for your computer or phone on the internet.
Frequently Asked Questions
What is the difference between IPv4 and IPv6?
IPv4 uses a 32-bit format (e.g., 192.168.0.1) and supports about 4.3 billion addresses. IPv6 uses a 128-bit format (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334) and supports vastly more addresses to accommodate the growing number of devices.
What is a Blacklist?
A blacklist, or DNS-based Blackhole List (DNSBL), is a list of IP addresses associated with spam, malware, or other unwanted online activity. Internet service providers (ISPs), email servers, and websites use these lists to block or flag traffic from listed IPs. If your IP is on a blacklist, your emails or web activity might be blocked. Our Blacklist Check tool lets you check if an IP is listed on major DNSBLs. Note that being listed may result from past activity by a previous user of your IP, and not all blacklists are equally reliable.
Why does my IP address show as "Not detected"?
If your IP shows as "Not detected," it could be due to your network setup, a proxy, or a VPN hiding your real IP. Try disabling any VPN or proxy and refreshing the page.
How accurate is the location information?
Location data is based on IP geolocation databases, which provide approximate city, region, and country details. Accuracy varies, especially for mobile or VPN users.