To block IP-based URLs:

1. Create HTTP Inspection filter for IPv4 addresses. To set up the filter:
   1. From the web console, Click HTTP > HTTP Inspection > Filters.
   2. On the Filters page, click Add > Advanced View.
   3. In the Patterns field, enter the following:

      _SCAN_SET_1_ REQ {
      METHOD: GET
      HOST: [0-9]+\.[0-9]+\.[0-9]+\.[0-9]+
      }

   4. Save the changes made.
2. Set up the policy that will use the filter set in Step 1:
   1. From the web console, Click HTTP > HTTP Inspection > Policies > HTTP Inspection Global Policy (or any policy).
   2. Select the filter you added above and block it.
   3. Save and deploy policies.

InterScan Web Security Virtual Appliance (IWSVA) should now block IP addresses (IPv4) entered on the browser's address bar.