upd : This stands for UDP. When you specify upd , you're instructing kportscan to perform a UDP port scan. Unlike TCP, UDP is a connectionless protocol, which means that it does not establish a connection before sending data. This makes UDP port scanning slightly more complex and can be less reliable due to the lack of a handshake, but it's still a valuable tool for network exploration.
Define your target scope. This can usually be formatted as an IP range (e.g., 192.168.1.1-192.168.1.254 ) or Classless Inter-Domain Routing notation (e.g., 10.0.0.0/24 ). Step 2: Define the Port List kportscan 30 upd