You could have downloaded ZiskoCalc 1.6 for Mac from our software library for free. The software lies within Internet & Network Tools, more precisely Network tools.
From the developer:
ZiskoCalc is a small Desktop-Toolkit that lets you convert values from many number-systems into others like hex, oct, bin, dec. Quick converting of full IP Addresses into different number Systems, CPU Benchmarking, get you System Up-Time and some other Statistics. Some often used Tables for ASCII and ANSI Codes are included, too.
You may want to check out more software for Mac, such as attach, which might be similar to ZiskoCalc.