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@benis_redux @menherahair @eric

I made a mistake :cirno_angry:

Okay so if we take 201.178.249.53

Turn that into binary (remember the 128 trick to offhand calculate this). You get the following

11001001.10110010.11111001.00110101

And with /13 you just count 13 digits so

11111111.11111000.00000000.00000000

Which is 255.248.0.0

Now the subnet mask in binary works like an AND function, so you can do the following.

11001001.10110010.11111001.00110101
AND
11111111.11111000.00000000.00000000
EQUALS
11001001.10110000.00000000.00000000
which converts into
201.176.0.0 (this is your network)

Now the highest possible value in that network is
11001001.10110111.11111111.11111111
Which converts into
201.183.255.255 I'm tired