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The reasons are as follows:

1. Data source

Different IP detection websites may use different data sources to obtain IP address information, which may include Internet service providers (ISPs), geolocation databases, public proxy server lists, etc. Therefore, there may be differences in test results.

2. Data processing algorithms

Different IP detection websites may use different algorithms and methods to process and analyze IP address information. These algorithms may consider different factors, such as geolocation, anonymity, proxy servers, etc. Therefore, even if the same data source is used, the algorithms of different websites may lead to differences in detection results.

3. Update frequency

IP address information may change. For example, an IP address may belong to a certain geographic location at one point in time, but it may have changed at another point in time. If the website updates its data more frequently, its detection results may be more accurate.

4. Geographic location accuracy

The mapping between IP addresses and geographic locations is not perfect and may have certain errors. Different IP detection websites may use different methods to determine the geographic location of IP addresses, which may lead to differences in detection results.

5. Detection technology

IP detection websites may use different technologies to detect IP addresses, and the use of these technologies may affect the accuracy and precision of test results.