In some web systems there is an IP address check for some purposes.

在某些网站系统有一些目的IP地址检查。

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Any competent hackers can spoof their IP address every time they visit the form, so they can easily subvert that simple security check.

任何有能力的黑客都可以在每次访问表单时伪装其IP地址，因此能够非常容易地让简单的安全检查失效。

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To check to see if you have such an IP address, run this command: ipconfig eth0.

要检查是否拥有ip地址，请运行以下命令：ipconfig eth0。

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Amazon, for example, utilizes an IP address locator, to check to see whether the computer someone is using to make a purchase is in a location that makes sense for that credit card holder, says Brady.

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Some embedded video and audio is only available in the UK. However, it may be that your network provider has allocated you an IP address outside the UK. You can check your connection location at www.speedtest.net .

BBC: Your guide to the BBC Embedded Media Player