>>> b = "255.255.248.0".split(".")
to get the bitcount just do:
>>> reduce(lambda x, y: x + (y + 1)/32, b, 0)
23Modify to taste and njoy
Tuesday, February 7, 2012
Translate a quad-dotted decimal netmask to its bit length equivalent
Here's an elegant way of translating a subnet netmask from its quad-dotted decimal representation to a bit length. The initial netmask is represented as a Python list. To get from the string representation to the list just do:
to get the bitcount just do:
Modify to taste and njoy
to get the bitcount just do:
Modify to taste and njoy
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2 comments:
Thank you for this little tidbit of information. I am running python 2.6.6 and experienced an issue with the list generating a string and not able to calculate. I just remapped b to an integer with this line and all works great!!
b = map(int, b)
Script looks as such:
b = "255.255.248.0".split(".")
b = map(int, b)
reduce(lambda x, y: x + (y + 1)/32, b, 0)
There maybe a more elegant way to work this out, but I am in a hurry to finish and just need something to work at this time.
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