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Paul TolentinoPaul Tolentino 

We are currently using a custom site called “support.netregistry.com.au” for our current support site which is being shown via visualforce page. How do I use the same URL to point to the new community site?

We are currently using a custom site called “support.netregistry.com.au” for our current support site which is being shown via visualforce page. How do I use the same URL to point to the new community site?
SwethaSwetha (Salesforce Developers) 
HI Paul,

Are you asking if you can use the same domain name for Salesforce Sites and Communities?

If so, Sites and Communities must each use a unique domain name.You can’t use the same domain name.

Reference: https://help.salesforce.com/articleView?id=faq_sites_migrate_to_community_site.htm&type=5
 
Hope this helps you. Please mark this answer as best so that others facing the
same issue
will find this information useful.
 
Thank you