So I was adding IP address ranges to AWS and ones I was adding had `/20` and `/16` on them. I realise this has an effect on the range, but I don’t understand what effect.
Part of the IP address stays the same and the other part(s) don’t.
Can someone explain what this means?
In: 9
The slash notation refers to the subnet mask. The number refers to the number of bits which will be ‘masked’. (An IPv4 has 32 bits). Basically, it’s used to indicate a range of IPs.
There are a number of free online IP calculators which can help you understand how this value affects results. I personally use https://jodies.de/ipcalc
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