Paul Moore wrote: > Note 1 - by the way, I use this form because I don't understand how > the /24 notation works. I can get the subnet mask from ipconfig, so I > use that.
<OT> It's just a shorthand way of writing IPv4 net masks based on their binary form: /8 = 8 ones followed by 24 zeroes = 255.0.0.0 /16 = 16 ones followed by 16 zeroes = 255.255.0.0 /24 = 24 ones followed by 8 zeroes = 255.255.255.0 /30 = 30 ones followed by 2 zeroes = 255.255.255.252 /32 = 32 ones followed by no zeroes = 255.255.255.255 It's particularly convenient when you're dividing subnets up into chunks that don't align with a byte boundary in the IPv4 address (e.g. /27 can easily be recognised as giving a subnet containing 2**5 = 32 hosts, but the subnet size is significantly less obvious when written using the equivalent 255.255.255.224 netmask). </OT> Cheers, Nick. -- Nick Coghlan | ncogh...@gmail.com | Brisbane, Australia --------------------------------------------------------------- _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
