Cobh is in Irish area code 021, the same as the city of Cork. That's +353 21 in international format.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Ireland does not have postal codes. For regular posting you would finish the address with the last 2 lines as follows: Co. Cavan Ireland. For an online form, most will accept IE as the code.
0035321 + the local number
Ireland is country code +353. Cork is area code 021, but you drop the zero for international calls. From Barcelona, dial 00 (international access prefix from Spain), country code 353, city code 21, and then the local number (probably 7 digits).
The postal code for Cork Ireland is P12.
Ireland does not have postal codes. You would finish that address as: Bishopstown Cork Ireland. It will get there if posted. If an internet form is looking for a postal code for addresses in Ireland, use ie.
Ireland does not have postal codes. You would finish that address as: Blackrock Cork Ireland. It will get there if posted. If an internet form is looking for a postal code for addresses in Ireland, then use IE as the code.
Ireland does not have post codes. So you would finish that address as: Donaghmore, Co. Cork Ireland. Note that it is Donaghmore and not Donoghmore, which is in another part of Ireland.
Ireland does not use post codes. You would end the address as follows: Bandon Co. Cork Ireland For internet forms looking for a code, use IE and that will work.
Ireland does not have postal codes. So you would write the address as you have it: 17 Gill Abbey Park Cork City Ireland
Ireland does not use postal codes. For Blackpool, you would have the last parts of the address as follows: Blackpool, Cork, Ireland. For internet forms, you would use IE if asked for a post code.
Ireland does not use postal codes. You can use the address as it is, and whatever you are posting will get there. For an internet form looking for a postal code in Ireland, use IE for it.
Ireland does not have zip codes. So the address as you have it will get there.