# FREE IP Subnet Calculators

{{< snippet "old" >}}

  - *[Classfull](http://www.subnet-calculator.com/)*,
    *[CIDR](http://www.subnet-calculator.com/cidr.php)*
    Web-based calculators.

  - *[3CIPCalc](ftp://ftp.3com.com/pub/utilbin/win32/3CIPCalc.zip)*
    IP Subnet mask calculator from 3Com.

  - [ipsubcal.zip](/public/tools/ipsubcal.zip)
    Simple IP Subnet mask calculator.  Does not need to be installed,
    just unzip and run.

  - [ipcalc.zip](/public/tools/ipcalc.zip) v1.02
    Net3 Group's IP Subnet mask calculator.  Does not need to be
    installed, just unzip and run.

  - [ipcalc2.zip](/public/tools/ipcalc2.zip) v2.02
    Net3 Group's IP Subnet mask calculator.  Must run a setup program.

  - *[Hymie's IP Subnet mask
    calculator](http://www.palmgear.com/software/showsoftware.cfm?sid=59563620001026203834&prodID=3938)*
    For the Palm Pilot.

{{< snippet "old" >}}