Hello Irfan,
It's great to hear that you are making plans to come over and see us!
Eircodes have been with us since July 2015 and each individual location/business has a unique code associated with it. In the past,
Dublin was the only place where it was defined with D1, D2, etc, but now the whole of the Republic of Ireland has an Eircode.
So, if you are using Google maps and looking for a location in Dublin, for example,
The Guinness Storehouse (D08 VF8H), enter the Eircode and it will drop the red pointer on the area. There is an
EIRCODE Finder website too that you can use with either the address or the Eircode.
The same can be found using the name so either will find the location. For places outside of Dublin, the same applies, either use the name of the place or its Eircode. We regularly say to people now that we need to find, what's your Eircode instead of what's your address! :)
Hopefully, this will help. What have you planned to see and do in Dublin?