From this address is sended reply for your PING request. It maybe not your requested destination, when some error occured!
property ReplyType: byte read FReplyType;
ICMP type of PING reply. Each protocol using another values! For IPv4 and IPv6 are used different values!
property ReplyCode: byte read FReplyCode;
ICMP code of PING reply. Each protocol using another values! For IPv4 and IPv6 are used different values! For protocol independent value look to ReplyError