A first communication apparatus includes a processor, and a memory storing instructions. The instructions causes the processor to: transmit first connection request information, which includes information of a network address of the first communication apparatus, information of a code indicative of communication with a second communication apparatus, and information of a port number for the communication, to one or more apparatuses being connected to a network which the first communication apparatus is connected to; receive second connection request information which is information that the second communication apparatus transmits to the network address in response to reception of the first connection request information; and establish a connection to the second communication apparatus.