The telephone number 018730463 has been reported as the registered number of Youth Defence in Ireland. If calling from outside the Republic of Ireland the number you need is +353 1 873 0463.
The office address reported is: 6 Gardiner Place, D1 Dublin, Ireland
I did a Companies Office search on Gript Media. The Annual Return was filed by one of the directors, Íde O’Hara, nee Nic Mhathuna, with a phone no given as 018730463. I did a search on the phone no and guess what? pic.twitter.com/k6qR5srOfv
— Bernie Linnane (@Berlinnaeus) March 3, 2021
It also appears as the contact telephone number to book a place on a bus for the All Ireland Rally for life.