If ESB directly receiving a request message from the source, you can use following properties to extract source IP related info, <log level="custom"> <property xmlns:ns=" http://org.apache. synapse/xsd " name="REMOTE_ADDR" expression="$axis2:REMOTE_ ADDR"></property> <property xmlns:ns=" http://org.apache. synapse/xsd " name=" REMOTE_HOST " expression="$axis2:REMOTE_ HOST"></property> </log> If you have a proxy server or load balancer in the middle, You can use following property to extract IP address of the request source, <log level="custom"> <property xmlns:ns=" http://org.apache. synapse/xsd " name=" X-Forwarded-For " expression=" $trp:X-Forwarded-For" "></property> </log>