all zeroes/all ones used in host IP's...

[Keith Owens]

On Fri, 28 Jan 2000 18:46:13 -0500, 
"Michael H. Warfield" <mhw en wittsend.com> wrote:
>	Stop thinking in octets.  This stuff is binary.

Make it easy on yourselves.  ftp://ftp.ocs.com.au/pub/ipcalc.pl.gz.

# ipcalc.pl 192.168.0.0/24
IP address         192   .  168   .    0   .    0    / 24  192.168.0.0/24
Netmask bits     11111111 11111111 11111111 00000000
Netmask bytes      255   .  255   .  255   .    0          255.255.255.0
Address bits     11000000 10101000 00000000 00000000
Network            192   .  168   .    0   .    0          192.168.0.0
Broadcast          192   .  168   .    0   .  255          192.168.0.255
First Host         192   .  168   .    0   .    1          192.168.0.1
Last Host          192   .  168   .    0   .  254          192.168.0.254
Total Hosts      254
PTR              0.0.168.192.in-addr.arpa
IP Address (hex) C0A80000

# ipcalc.pl 192.168.0.0/16
IP address         192   .  168   .    0   .    0    / 16  192.168.0.0/16
Netmask bits     11111111 11111111 00000000 00000000
Netmask bytes      255   .  255   .    0   .    0          255.255.0.0
Address bits     11000000 10101000 00000000 00000000
Network            192   .  168   .    0   .    0          192.168.0.0
Broadcast          192   .  168   .  255   .  255          192.168.255.255
First Host         192   .  168   .    0   .    1          192.168.0.1
Last Host          192   .  168   .  255   .  254          192.168.255.254
Total Hosts      65534
PTR              0.0.168.192.in-addr.arpa
IP Address (hex) C0A80000


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