Domain Separation TOP domain impactSummaryTwo inquiries regarding the TOP domain in a domain separated instance Why it is recommended by ServiceNow to keep the domain named "TOP"? There is no explicit suggestion to utilize the name 'TOP' for the highest parent domain.This is a commonly used name to indicate the topmost level in the domain hierarchy.However, in all the available documents for Domain Separation, the term 'TOP' is consistently used to refer to the highest domain level for ease of understanding.Nonetheless, there is no firm rule that dictates the use of 'TOP'; rather, it is the value in the sys_domain_path field that holds significance when evaluating domains.So long as the parent's path is accurate, users are free to use any name they desire instead of 'TOP'. What will be the impact or will there be any impact if customer deletes the domain "TOP"? It is impossible to anticipate the impact of changing the name of the TOP domain, as it depends on the files that were generated on the TOP domain from Out of the Box (OOB) during plugin installation.If the user modifies the name, that is acceptable. However, if they delete the TOP domain and create a new one, it may not have the same domain path for the highest level in the hierarchy.Consequently, records that were created on the previous TOP domain may no longer function correctly, as their domain path assessment will fail.Additionally, domain path validation will also fail since the system will be unable to locate the domain path that the old TOP domain had, and the new TOP domain path will be different. Related LinksUnderstanding Domain Separation