Now, the three bits that are ones in the 252 mask that are zeros in the 224 mask are bits 3-5 (counting from left to right, starting at 0). Since we are only subnetting within the /27, these bits are the only ones that change, so we change them one bit at a time, giving us:
11100000 = 224
11100100 = 228
11101000 = 232
11101100 = 236
11110000 = 240
11110100 = 244
11111000 = 248
11111100 = 252
Note that bits 3-5 have taken on every possible combination that 3 bits can take ...
Say you have subnetted a /24 into 8 /27s. Now you need some /30s. Instead of subnetting the whole /24 into /30s, you sub-subnet one of those /27s, leaving the others intact. So your /24 now consists of 7 /27s and 8 /30s.
I'm afraid you have to learn to do this in binary before you can get comfortable with it. It looks a lot more complicated than it really is...
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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