John works as a professional Ethical Hacker. He has been assigned the project of testing the security of www.we-are-secure.com. He has successfully performed the following steps of the preattack phase to check the security of the We-are-secure network:

Gathering information

Determining the network range

Identifying active systems

Now, he wants to find the open ports and applications running on the network. Which of the following tools will he use to accomplish his task?