The Microsoft IASPARSE.EXE command line utility parses logs produced by Internet Authentication Service and Remote Access Service and converts them into readable format.
You can find iasparse.exe utility in Windows 2000 Resource Kit Tools. But you may stop searching for iasparse utility because it has some disadvantages such a console output only, analyze whole iaslog file only, text output only and so on.
Look at out IAS Log Viewer utility - tool that replace iasparse utility.
IAS Log Viewer gives system administrators more flexibility and options to process IAS log files of any size dynamically, on-the-fly, with Formula 1 speeds, providing program users with several options of data processing. Importantly, IAS Log Viewer accepts two types of log files (IAS-formatted and DB-formatted), simultaneously processes several log files (or a folder containing multiple IAS log files), works with log files real-time, and exports IAS log records or RRAS connections to HTML, XML or CSV files.