The An Post tracking number format is usually comprised of 2 alphabetic characters, 9 numeric characters, and 2 alphabetic characters.

An Post tracking number format:

• 2 letters + 9 digits + 2 letters

An Post tracking number example:

LF013240044IE

LF013240035IE

LF012691949IE

LF012691935IE

PP064751926IE

RL684037936IE

CU100100783IE

RL687853624IE

AY140715799IE

CA028719208IE

CA028719287IE

RL655469333IE

RL695972053IE

LF012691921IE

LF012691918IE

LF012691904IE

With a "Post" in its name, An Post, founded in 1984, is also a state-owned limited company. As one of Ireland's largest companies, it provides a "universal postal service" to all parts of the country as a member of the Universal Postal Union, including letter post, parcel service, deposit accounts, Swiftpost, an all-Ireland next-day delivery service, and EMS, the international express-mail service. 

You can also track your An Post tracking number on trackingmore.com