The other sites auto-detect your current IP address, but at IP2Location you have to provide the IP address. Geobytes seems to be least accurate, but in fairness, I haven't done detailed testing

1. What is IP-based Geolocation? IP-based Geolocation is mapping of an IP address or MAC address to the real-world geographic location of an Internet-connected computing or a mobile device. Geolocation involves in mapping IP address to the country, region (city), latitude/longitude, ISP and domain name among other useful things. What Is My IP Address? (IPv4 & IPv6) - Show My IP The next time you wonder “What is my IP address?”, then think of it as a unique code that identifies your computer on the worldwide network. Your IP allows your computer to receive emails, images and other data from the web. An IP address normally consists of 4 sets of 1 to 3 digits separated by a dot. The sets of numbers can range between What is my IP address?

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The Internet Protocol Address (or IP Address) is a unique address that computing devices such as personal computers, tablets, and smartphones use to identify itself and communicate with other devices in the IP network.Any device connected to the IP network must have a unique IP address within the network. An IP address is analogous to a street address or telephone number in that it is used to What's My IP Address Location - What Is My IP Address Location

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If either of these contain your real external IP (not a local 192.168.x.x address), that could provide any website with a way to detect your real location. The report might also list signs that First, it uses various HTTP variables to find the browser language, type, where you surfed from - i.e. what your IP address is (plus the referrer) - DNS is used to lookup the hostname from the later. Note that if you are using a web proxy (quite common in Corporate Environments), that IP address and hostname is what will be shown/used.