Code:
it-lenny:~$ ipcalc 64.5.96.0 /26
Address: 64.5.96.0 01000000.00000101.01100000.00 000000
Netmask: 255.255.255.192 = 26 11111111.11111111.11111111.11 000000
Wildcard: 0.0.0.63 00000000.00000000.00000000.00 111111
=>
Network: 64.5.96.0/26 01000000.00000101.01100000.00 000000
HostMin: 64.5.96.1 01000000.00000101.01100000.00 000001
HostMax: 64.5.96.62 01000000.00000101.01100000.00 111110
Broadcast: 64.5.96.63 01000000.00000101.01100000.00 111111
Hosts/Net: 62 Class A
it-lenny:~$ ipcalc 64.5.96.64 /26
Address: 64.5.96.64 01000000.00000101.01100000.01 000000
Netmask: 255.255.255.192 = 26 11111111.11111111.11111111.11 000000
Wildcard: 0.0.0.63 00000000.00000000.00000000.00 111111
=>
Network: 64.5.96.64/26 01000000.00000101.01100000.01 000000
HostMin: 64.5.96.65 01000000.00000101.01100000.01 000001
HostMax: 64.5.96.126 01000000.00000101.01100000.01 111110
Broadcast: 64.5.96.127 01000000.00000101.01100000.01 111111
Hosts/Net: 62 Class A
of course using a calculator is cheating. you should never cheat until you completely understand subnetting and know how to do it manually..
I usually recommend the site
http://www.learntosubnet.com/ as a decent place to learn the basics.
P.S. this thread should have been in the networking forum.. 
