它被称为 Identicon 。如果您输入并通过电子邮件发送，则它基于您的电子邮件地址的哈希值。如果您没有输入电子邮件，则它取决于您的IP地址。

It's called an Identicon. If you entered and e-mail, it's a based on a hash of your e-mail address. If you didn't enter an e-mail, it's based on your IP address.

Jeff 发布了一些.NET代码以生成基于IP的Identicons。

Jeff posted some .NET code to generate IP based Identicons.