Have a look at this webpage:
https://www.irish-genealogy-toolkit.com/Northern-Ireland-civil-registration.htmlGRONI Search Room Database: Personal visitors only. This facility is not on the Internet and can be accessed only at GRONI's Public Search Room in Belfast OR on dedicated computer terminals at the Public Record Office of Northern Ireland (PRONI), also in Belfast.
Contact GRONI
General Register Office (GRONI)
NISRA
Colby House
Stranmillis Court
Belfast BT9 5RR, UK.
Telephone: 0300 2007 890 or (+44(0) 28 9151 3101 if you are calling from outside Northern Ireland).
There is no 'historical records' access restriction for personal visitors. This computerised system holds Northern Ireland civil registration records as follows:
Births – 1864 to date
Marriages – 1845 (1864 for RC events) to date
Deaths – 1864 to date
Adoptions – 1931 to date
Civil partnerships – 2005 to date