Excellent ipdb file format!

[hzzb]

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How does this SDK find out the geo location of a given IP address? I'm curious about this and read the source. It's really a nice design! The most eye-catching and exciting part is file format. I draw it's layout as below:

If I understand correctly, the green 1-byte between nodes area and records area is unused. Is this 1-byte hole necessary?

:)