Abstract: A domain protected marks list (DPML) blocks domain name registrations that contain validly registered trademarks. When a request is received from a requestor for a DPML registration for a string comprising a trademark, it is verified to ensure the validity of the trademark and to further ensure that a prior block on the string does not already exist in one or more registries. Upon the verification, a DPML block is registered across the registries which do not comprise a domain name that corresponds to the string. This prevents domain name registrations for the string within the registries by parties other than the requestor.