[Techtalk] sub/super-netting

[kansas_kennedy at phreaker.net]

My questions are on the area of subnet masking and super netting.

If say, I have an address 203.191.0.0/8. From here I can tell that this 
class C address has been fitted into a large network where 203 is the 
network and 191.0.0 to 254.255.255 can be assigned as host to the network 
203. Now, my question is can we, by looking at this simple address, tell 
how many maximum hosts can be assigned to this address?

Also, 172.16.26.32 has a mask of 255.255.255.254 can also be written as 
/27. I can't seem to find the correlation.

Again, a broadcast address has 255 in the host part of the address. Packets 
send to the broadcast address reaches every address under that network. 
Does it mean that if I send a mail to a 203.127.255.255 then this will 
reach every user of NetID 203.127?

As till my understanding the unicast address is the address assigned to a 
single host in a network and it can be static or dynamic IP and multicast 
address is assigned to a group of pc's. like the accounting department has 
been assigned 203.127.137.0 to 203.127.137.255. Is this correct?

Hacking IPv4....a few more questions to follow....and a tutorial in the end.