- One of the prefixes in the list is **12.0.0.0/8**, which encompasses the 12.0.0.1-15.255.255.254 range of IP addresses. Since 13.107.21.200 is within that address range, the **AllowInternetOutBound** rule allows the outbound traffic. Additionally, there are no higher priority (lower number) rules shown in the picture in step 2 that override this rule. Close the **Address prefixes** box. To deny outbound communication to 13.107.21.200, you could add a security rule with a higher priority, that denies port 80 outbound to the IP address.
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