Converting an IP address to a number:

Question

Question: When I convert the IP address 192.168.115.67 to a number, is it done like this:
192*256³ + 168*256²+115*256¹+67*256⁰ = 3232265027

or like this:
192*256⁰ + 168*256¹+115*256²+67*256³ = 1131653312

I find both variants online, and frankly it doesn't matter as long as I do all the internal IP-range comparison using the same conversion process variant. But I want to calculate the IP V6 from the IPv4 address, and it seems both variants are on the web... resulting in different IPv6 addresses, and only one can be correct...

I use the 1131653312 variant, as 1131653312 is the variant I saw .NET giving me, but 3232265027 is the variant I used when I did it in C++, and that is also the variant I find on the web for IPv4 to IPv6 conversion, and which I used before I saw that .NET uses variant 1131653312 ...

Answer 1

It is definitely first one. You can ping and see how ping utility convert it to a.b.c.d notation. If you going to do this conversion I recommend expression: (a << 24) | (b << 16) | (c << 8) | d