Get the salesforce Host Name

Get the salesforce Host Name, Returns the host name of the current URL.

Solution: 1

salesforce winter 23 release a new class DomainCreator. It has the getOrgMyDomainHostname method to get host name.

String baseURL = DomainCreator.getOrgMyDomainHostname();
System.debug('Base URL: ' + baseURL );

to get lightning page host name

String lightningHostName = DomainCreator.getLightningHostname();
System.debug(lightningHostName);//resourceful-shark-haq2ar-dev-ed.trailblaze.lightning.force.com

Solution: 2

String baseURL = URL.getSalesforceBaseUrl().getHost();
System.debug('Base URL: ' + baseURL );

Source:
https://developer.salesforce.com/docs/atlas.en-us.240.0.apexref.meta/apexref/apex_class_System_DomainCreator.htm#apex_System_DomainCreator_methods