NetworkActiv Scanner is a Fast, Easy to use, Advanced network scanner with many useful features. You can perform DNS dig, whois, and more. Main features are: TCP connect() scanning (standard TCP port scan), TCP SYN scanning (fast and "quiet" TCP port scan), Fast UDP port scanning with auto-speed control and reliable results, UDP sub-net scanning, High speed ping scanning of sub-nets (UDP or ICMP), TCP sub-net scanning, Integrated fast trace-route, Remote OS detection via advanced TCP/IP stack fingerprinting, Wizard Mode: Walks you through step-by-step to perform network scanning, trace-route, and much more. Whois Client: Ability to perform whois with ease, you can either specify a whois server, or have it attempt to determine a whois server automatically. DNS Dig system: Performs DNS dig quickly with ease, choose between TCP and UDP, specify a DNS server or have it attempt to determine the authoritative server automatically. Also, support for many RR's (Resource Records), Simple Port Scan Mode for easy and quick port scans, Nice looking interface, with multi-skin support, Tells you if remote computer being scanned is stealth, User set-able max speed (ranging from 2 PPS to non-limited), Tells you the host responses for TCP connect() port scan and sub-net scan, Tells you the port use from huge lists of ports as found, Random order, reverse order, and "Only Scan Known Ports" scan capable, and much more.
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