I learned a new command today

Let's make it simple, it's pretty self-explanatory. Since I'm a netadmin, every little thing can help, and this is no exception. It should make my life MUCH easier.

sudo apt-get install sipcalc

And then:

mtrudel@icarus:~$ sipcalc 10.10.0.0/21
-[ipv4 : 10.10.0.0/21] - 0

[CIDR]
Host address - 10.10.0.0
Host address (decimal) - 168427520
Host address (hex) - A0A0000
Network address - 10.10.0.0
Network mask - 255.255.248.0
Network mask (bits) - 21
Network mask (hex) - FFFFF800
Broadcast address - 10.10.7.255
Cisco wildcard - 0.0.7.255
Addresses in network - 2048
Network range - 10.10.0.0 - 10.10.7.255
Usable range - 10.10.0.1 - 10.10.7.254

-
mtrudel@icarus:~$ sipcalc 10.10.9.9
-[ipv4 : 10.10.9.9] - 0

[CIDR]
Host address - 10.10.9.9
Host address (decimal) - 168429833
Host address (hex) - A0A0909
Network address - 10.10.9.9
Network mask - 255.255.255.255
Network mask (bits) - 32
Network mask (hex) - FFFFFFFF
Broadcast address - 10.10.9.9
Cisco wildcard - 0.0.0.0
Addresses in network - 1
Network range - 10.10.9.9 - 10.10.9.9

-

Beautiful little program, gives you all kind of useful information, and it's free!