Mass. Gen. Laws ch. 51 § 64
The state secretary shall create and maintain an online portal through which a person, including those who have pre-registered pursuant to section 47A, may check to determine whether that person is registered or pre-registered to vote. The portal shall allow a person to enter the person's name, date of birth and residential zip code. The portal shall subsequently display whether a voter with that name, date of birth and residential zip code is registered or pre-registered to vote, whether the registration of the voter is active or inactive pursuant to section 37A, the polling location for the voter and state and federal elected officials who represent the voter. The portal shall not display any other biographical information about the voter except the information provided by the user of the site. If there is no voter in the central registry of voters matching the information submitted to the portal or if the voter's registration is inactive, the website shall inform the user how the user may obtain a voter registration form or restore the user's registration to active status.
Mass. Gen. Laws ch. 51, § 64