Whatmask - IPv4 address/mask calculator

Whatmask can be used two ways:
                                                                   Example of query:
Given a mask enter:    CIDR bits                                   20
               - or -  subnet mask                                 255.255.224.0
               - or -  hex subnet mask                             0xfffff000
               - or -  wildcard bit mask                           0.0.15.255
NOTE: whatmask will autodetect the input and show you all four.

Given an ip/mask enter: IP address/netmask                        Example of query:
    where netmask may be one of the following:
                       CIDR notation (e.g. "27")                   67.254.91.77/27
                       Netmask notation (e.g. "255.255.128.0")     67.254.91.77/255.255.128.0
                       Hex Netmask notation (e.g. "0xffffff00")
                       Wildcard bits notation (e.g. "0.0.3.255")
NOTE: whatmask will autodetect the netmask format.

Query: