determining a subnet mask limitation on hosts
What is the max number of hosts in a /19 subnet.
my answer was (2^14-2) which is 16382
book says its 8190???
16382 is a /18
/19 is in fact 8190, it’s 255.255.224.0 …
edit: your math is only off by one, 13 instead of 14, it’s 2^(19-32)-2 which is 8190
btw i am NOT a network guru, but figured i could help 
I hate figuring out subnet mask shit
I use this webpage when I want to figure it out.
http://www.aboutmyip.com/AboutMyXApp/SubnetCalculator.jsp?ipAddress=192.168.0.1&cidr=19