Used LanCalculator for Windows?
Developer’s Description
By LanTricks
LanCalculator - makes possible not only to easily calculate the subnet addresses range and subnet masks but also broadcast address, net address, net prefix and net mask inversion which is used in the access control lists (ACL) of Cisco network equipment. One key press is enough to calculate all parameters after net address and mask were entered.
To complete the picture additional display is given in binary, decimal and hexadecimal notation. Version 1.0.2.29 may include unspecified updates, enhancements, or bug fixes.
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