Sending inbound Web Service requests to ServiceNow using IP address instead of HostNameSummarySending inbound Web Service requests to ServiceNow using IP address instead of HostName. Instance pairs ( Production/Sub-Production) hosted on the same data center may resolve to the same IP . It is always recommended to send inbound web service call using the HostName of the ServiceNow instanceInstructionsTo send using IP address add 'Host' header in the inbound Web Service request . For example use below header in the REST call to route to the right serverHost: <instance_name>.service-now.com:443