Whatmask runs in a DOS shell (Command Prompt). Whatmask is a small C program that will help you with network settings. Whatmask can work in two modes. The first mode (which is how prior versions worked) is to invoke Whatmask with only a subnet mask as the argument. In this mode Whatmask will echo back the subnet mask in three formats, plus the number of useable addresses in the range. Netmask Notations supported: Name Example --------------------------------- CIDR /24 Netmask Wilcard Bits The above notations are all identical. CIDR notation commonly has a "/" in front of the number (representing the number of bits). Whatmask can accept these notations with or without a slash. This notation is used more and more recently. A lot of popular routers and software support this notation. Netmask notation is pretty much the standard old-school way of doing it. It is supported by most systems (Un*x, Win, Mac, etc.). Wilcard bits are similar to the netmask, but they are the logical not of the netmask. This notation is used by a number of popular routers (and nobody knows why...). To use Whatmask in the original mode simply type "whatmask " The notation can be in any of the three formats and Whatmask will automagically figure out what it is and display all three notations. To find out more about subnets and netmasks see the References section below. To use Whatmask in its second mode execute Whatmask with any ip address within the subnet, followed by a slash ('/'), followed by the subnet mask in any format. (e.g., or Whatmask will echo back the following: The netmask in the following formats: CIDR, Netmask, Wildcard Bits The Network Address The Broadcast Address The number of Usable IP Addresses The First Usable IP Address The Last Usable IP Address (Whatnet assumes that the Broadcast address is the highest address in the subnet. This is the most common configuration.)
Price USD 0
License Free
Version 1.2
Operating System Windows 95, Windows 2000, Windows 98, Windows, Windows NT
System Requirements
  • Windows NT 4 SP 6
  • Windows 2003 SP 1
  • Windows XP AMD 64-bit
  • Windows XP 64-bit SP 1
  • Windows NT 4 SP 2
  • Windows 2000 SP 1
  • Windows 2003 64-bit
  • Windows 2003 AMD 64-bit
  • Windows XP 64-bit SP 2
  • Windows NT 4 SP 3
  • Windows 2000 SP 2
  • Windows Server 2003 x64 R2
  • Windows 2000
  • Windows 2003 64-bit SP 1
  • Windows Vista AMD 64-bit
  • Windows XP Itanium 64-bit
  • Windows NT 4 SP 4
  • Windows 2000 SP 3
  • Windows NT 4
  • Windows XP 32-bit
  • Windows XP SP 1
  • Windows Server 2003 x86 R2
  • Windows ME
  • Windows 2003 Itanium 64-bit
  • Windows NT 4 SP 5
  • Windows 2000 SP 4
  • Windows Vista 32-bit
  • Windows XP 64-bit
  • Windows NT 4 SP 1
  • Windows Server 2008 x64
  • Windows NT 3
  • Windows Server 2008 x86
  • Windows XP
  • Windows Server 2008
  • Windows 2003
  • Windows Vista Itanium 64-bit
  • Windows XP Itanium 64-bit SP 1
  • Windows 2003 32-bit
  • Windows XP Itanium 64-bit SP 2
  • Windows XP SP 2
  • Windows 95
  • Windows 98
  • Windows Vista
  • Windows NT
  • Windows 2003 Itanium 64-bit SP 1
  • Windows XP Pro