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Excellent ipdb file format! #16

@hzzb

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@hzzb

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:

ipdb

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

:)

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