You are implementing Dynamic Virtual IP Address (VIPA). If a CICS Transaction Server TCPIPSERVICE is defined with IPADDRESS of 'blank', CICS will display the default stack IP address. However a 'netstat' will display the Dynamic VIPA address. Your WebSphere MQ and DB2 applications do not specify an IP address, but they display the Dynamic VIPA address. Only CICS is defaulting to the stack address whenever the IP address is left blank.