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Wed Sep 16 23:59:47 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-September/091784.html

Nick Coghlan wrote:

> Or, to put it another way, given an arbitrary host in a network (e.g.
> your own machine or the default gateway) and the netmask for that
> network, calculate the network address.

Some people have claimed that the gateway address of a
network isn't necessarily the zero address in that network.
If that's true, then you *can't* calculate the network
address from a host address and a netmask -- there isn't
enough information. Furthermore, an IPNetwork object
needs to be able to represent a network address whose
address part contains bits that aren't in the mask.

-- 
Greg

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[Python-Dev] PEP 3144 review.