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ShieldsUp is an online port scanning service created by Steve Gibson of Gibson Research Corporation and hosted at The purpose of this utility is to alert the users of any ports that have been opened through their firewalls or through their NAT routers. The utility can scan the most common file sharing ports, as well as all service ports (1-1056), and user defined ports, in sets of 64.[1]

It is often recommended for checking port vulnerabilities.[1][2][3][4][5][6][7][8][9]

The scanning servers have the static IP addresses of to[10]


  1. ^ a b Ho, Erica. "ShieldsUP Tests Your Firewall for Vulnerabilities". 
  2. ^ "an oldie but goodie"
  3. ^ "How to Test Your Antivirus, Firewall, Browser, and Software Security". 
  4. ^ "Everyone should run this test."
  5. ^ "ShieldsUP: Firewall Vulnerability Test Tool". 
  6. ^ "For Home Networkers".  "Gibson's most popular utility by far is ShieldsUp"
  7. ^ "How to Test Your Firewall".  "One of the easiest and most useful available is ShieldsUP"
  8. ^ "I can't pass a firewall test, what should I do?". Ask Leo.  "I love Steve Gibson, and his firewall testing utility Shields Up"
  9. ^ "ShieldsUP Tests Your Firewall for Vulnerabilities". Lifehacker.  "it's a solid tool worth highlighting"
  10. ^ CORPORATION, Steve Gibson, GIBSON RESEARCH. "GRC - ShieldsUP! — Internet Vulnerability Profiling". 

External links[edit]