W5500 IPRAW mode can handle IP layer's upper protocol in the TCP/IP Layer. W5500 IPRAW mode supports transport layer protocol such as ICMP(0x01),IGMP(0x02),TCP (0x06) and UDP(0x11) according to the protocol field of IP header, depending on the protocol number. The 'Ping' of ICMP is already implemented in W5500 as the Hardwired but when the user needs, the host can directly process the ICMP function include ping by opening the Socket n as an IPRAW mode.