Best Full TCP Port scanner For Windows / Linux that is Multi threaded and can scan 1-65535 TCP Ports via normal connect or SYN Scan
You can run multiple threads at the same time for best performance.
Both neighborhood and open IP addresses for open ports.
It has threaded option as well so you can easily scan many IPs very fast.
You can utilize the TCP Port scanner to output your open ip, neighborhood IPs and for instance your firewall.
This way you can find out if you have open ports on your network that actually should be firewalled off.
Audit and find out if your security policy is still active.
Often human mistakes can allow to open up ports that should be firewalled off.
And now you can easily find out.
Version 1.3 - 21 March 2011
## 1.3 added more default ports
Version 1.2 - 17 March 2011
## 1.2 default port list is now not 1-1024, but is a list of frequently used ports; duplicates check
Version 1.1 - 8 March 2011
# ## 1.1 you could use not only port range, but single ports and port lists (check -p option)
Version 1.0 - 3 March 2011
# ## 1.0 initial release