Port Invader - description from Softdepia.com:
Port Invader is a multiple IP address scanner that can benefit network administrators to security professionals. Port Invader takes a range or list of IP Numbers and scans ports that you specify. Port Invader lists all open ports on any given IP Address with an affordable price ($19.95). This tool will also allow you to save your data to your Hard Drive, do Reverse DNS Lookups and much more!
IP Address Scanning - List or Range of IP Addresses.
Port Scanning - Scan multiple Ports
Reverse DNS Lookup
Scan Saving - Save your scan contents
Fast Local IP Scanning - Local IP Scanning in under 20 seconds (1024 Ports on most computers)
Who can use Port Invader?
Anyone can use Port Invader. Its easy to use user interface allows almost any novice with a brief knowledge of IP address to scan.
Use it to Check for open port. Many Trojan horses use ports; With Port Invader you can know if they are on your system.
Port Invader is a "Free to try" program. You can download and try it for an evaluation period.