Yes, it is possible to register a .ie domain with only 2 letters (such as ab.ie, cd.ie, ef.ie, etc.). As 2 letter .ie domains are very popular, alot of the combinations have already been registered. To see if a 2 letter .ie domain is available, please check our Domain Registration page.
If you have any questions on this, please do not hesitate to get in contact with our Sales Department.