Just wrote a examn about IPs an totally fucked it up. I hate subnet masks. SERIOUSLY, FUCK THEM

AAAHHHH fuuuuuu

💔

I loved that stuff in my Networking class! Lol

Its the math that always screws me over

@Minzkraut Just curious, do you do it the "block size" way?

@boomi I'm not sure what you mean

@Minzkraut

I just remember these lists (ignore the periods and bad formatting ):
128 192 224 240 248 252 254 255
/25 /26. /27. /28. /29. /30. /31 /32
128. 64. 32. 16. 8. 4. 2. 1

So, we know any /26 has a block size (or range of addresses) of 64. Just increment until you land in the range where the address is:

Arbitrary IP/mask: 123.65.34.187/26

123.65.34.0
123.65.34.64
123.65.34.128. <====
123.65.34.192

Subnet ID is .128, broadcast is .191.

The first list, 128 192 224 240 248 252 254 255, is used if you get a subnet in DDN instead of slash notation. E.g. 255.255.255.192 .

256 - 192 = 64

That being said, I too suck at math , and have difficulty with not screwing up basic addition in my head. Depending on how you were taught to do it though, this might be substantially easier.