Portscan

Owned by Paul McCullough (Unlicensed)
Last updated: Jun 14, 2017 by Samuel Valdez (Unlicensed)

The tool on linux for this is called nmap. Not sure what you would use on a PC, but I'm sure some googling will turn something up.

Looks totally clean from my network:

sudo nmap 209.126.178.76 209.126.178.77 209.126.178.78 -Pn

Starting Nmap 5.50 ( http://nmap.org ) at 2011-08-15 17:05 PDT
Nmap scan report for 209.126.178.76
Host is up.
All 1000 scanned ports on 209.126.178.76 are filtered

Nmap scan report for 209.126.178.77
Host is up.
All 1000 scanned ports on 209.126.178.77 are filtered

Nmap scan report for 209.126.178.78
Host is up.
All 1000 scanned ports on 209.126.178.78 are filtered

Nmap done: 3 IP addresses (3 hosts up) scanned in 601.92 seconds