The "N" on an Irish Homing Union (IHU) ring indicates that it was issued by the North Region.
Rings are distributed by the Regions every year, mainly through clubs. Click on a year to view the listing for that year.
Whereas the lists for each year show which club distributed the rings, it must be stressed that the lists are only a guideline. Pigeons are constantly being exchanged between members of clubs. Just because a ring was issued in, say, Downpatrick, it does not mean that the current owner lives there. It could now belong to someone in Belfast, Comber, Ballywalter, etc. Or the owner could be overseas!
Bearing this in mind, use the ring lists as a guideline only.
Having discovered which club issued the ring, check the "Secretaries" list to make contact with that club.