Post Office Tracking Number: For An Post and Royal Mail

Sending a parcel is straightforward until you need to prove where it is, but whether you dropped it at a Post Office counter in Liverpool or an An Post branch in Cork, the tracking number on your receipt is the only link between you and your package. This guide explains exactly where to find that number, how to read its format, and what to do when tracking doesn’t behave as expected.

An Post tracking number format: AY123456789IE (13 characters) ·
Royal Mail tracking number length: 9 to 27 characters ·
An Post tracked services: International tracking to 190+ countries ·
Post Office receipt reference: 9-27 character alphanumeric code

Four key facts, one pattern: An Post and Royal Mail use different tracking structures, but both print the reference on your receipt. Here is the at-a-glance comparison:

How to find your Post Office tracking number on a receipt?

Where is the tracking number printed?

• Post Office receipts for tracked services always include a reference number near the top or bottom of the slip. For Royal Mail services bought online or at a counter, the tracking number is the same as the reference number printed on the receipt (Post Office UK).
• For An Post, the tracking number appears on the receipt under a label such as “Tracking Number” or “Reference.” Keep the receipt until the parcel is delivered (An Post (Irish postal service)).

What does the tracking number look like on a Post Office receipt?

• Royal Mail tracking numbers vary in length from 9 to 27 characters and may include letters and numbers. They are often printed with a barcode underneath (Post Office UK mail guide).
• An Post tracking numbers follow a strict pattern: two letters, nine digits, then two letters — for example, AY123456789IE (An Post track and trace).
• Evri parcels also pass through some Post Office counters; Evri uses a 16-character tracking code (Evri parcel tracking).

The implication: keep the receipt until the package arrives, and note the format to avoid confusion later.

What is the format of an An Post tracking number?

An Post tracking number structure

• Every An Post tracking number is exactly 13 characters long: two letters, nine digits, two letters. The final two letters are always IE for items posted in Ireland (An Post (Irish national postal operator)).
• This format follows international S10 standards set by the Universal Postal Union, which means the number works on global tracking platforms.

Examples of valid An Post tracking numbers

• AY123456789IE — standard tracked parcel
• RT987654321IE — registered post
• CP456789012IE — customs-tracked item

The pattern: the IE suffix is the key identifier for Irish parcels, so always check for it before assuming you have the right number.

How to track international and registered post with An Post?

Tracking international parcels with An Post

• An Post offers international tracking to more than 190 countries through its tracked and registered services. Enter your tracking number on the An Post track and trace page.
• For parcels sent from Ireland to the UK, Royal Mail takes over delivery. You can track the item on both carriers’ sites using the same An Post tracking number (Royal Mail (UK postal service)).

Tracking registered post (certified mail)

• Registered post (also called certified mail) requires a signature on delivery and is fully trackable. The tracking number format is the same as standard tracked items (An Post registered post help).
• Delivery confirmation is usually available within 24-48 hours after dispatch, though international items may take longer.

The catch: while tracking works across borders, update frequency may vary, so check both sites if one is slow.

How to track a parcel sent via Post Office UK?

Using the Royal Mail tracking system

• Post Office UK uses Royal Mail’s tracking infrastructure. Go to postoffice.co.uk/track-trace and enter the reference number from your receipt (Post Office UK tracking).
• Royal Mail tracking numbers are 9 to 27 characters. If you bought a service that includes tracking (such as Special Delivery or International Tracked), the reference number is the tracking number (Post Office UK).

Entering your Post Office reference number

• Type the number exactly as printed, ignore spaces. Capitalise letters if required. The system is case-sensitive for some services (Post Office UK).
• If you bought a parcel service from Evri or DPD via Parcels Online, the tracking number will be emailed to you. You can also find it in your order history on the Post Office website (Post Office UK).

What this means: always verify the service type on your receipt before expecting tracking updates.

What to do if your tracking number doesn’t work or you need help?

Common reasons for tracking not updating

• Allow 24-48 hours for the first scan to appear after the item is deposited. In busy periods (like Christmas), delays can extend to 72 hours (USPS (US postal service)).
• Check for typos: a single wrong character returns no results. Compare the number on your receipt carefully, especially zero vs O and 1 vs I.
• The service you purchased may not offer tracking. Non-tracked services (like standard letters) show no updates (Post Office UK).

Contacting An Post customer support

• Call An Post customer service at 01 705 7600 (Monday to Friday, 8:30–17:00). Provide your tracking number and receipt details (An Post contact information).
• You can also visit any An Post branch with your receipt for in-person help.

Contacting Royal Mail customer support

• Royal Mail customer service is available at 03457 740 740 (Monday to Saturday, 8:00–18:00). Have your tracking number and proof of posting ready (Royal Mail (UK postal service)).
• If you bought the service online, log in to your Post Office account to view order history and resend the tracking link.

The pattern: most issues are simple to fix; a systematic check saves time before calling support.

Step-by-step guide to tracking a parcel with your Post Office tracking number

1. Locate your tracking number. Check your Post Office receipt, email confirmation, or online order history. For An Post it is 13 characters ending with IE; for Royal Mail it is 9-27 alphanumeric characters (Post Office UK mail).
2. Identify the carrier. If your receipt says “An Post,” use An Post’s tracking page. If it says “Royal Mail” or “Post Office UK,” go to the Royal Mail tracking page. For Evri or DPD, check the carrier’s own site (Evri (UK courier)).
3. Enter the number exactly as printed. Ignore spaces, use capital letters for letters. Do not add hyphens.
4. Check the status. Typical updates: “Accepted,” “In transit,” “Out for delivery,” “Delivered.” If you see an error message, double-check the number or wait 24 hours.
5. If no update appears after 48 hours, contact the sender or carrier. Provide the tracking number and receipt image (USPS package help).

The takeaway: following this sequence will cover most scenarios and get you to the right resolution quickly.

What we know and what remains unclear

The catch: while the formats are confirmed, the real-time nature of updates depends on carrier scanning practices.

Quotes from official sources

“A tracking number is in the format of two letters, followed by nine digits, and ending in two letters.”

An Post (Irish national postal operator)

“You’ll need the reference number on your Post Office receipt to track your items; this number will be 9-27 characters long.”

Post Office UK (UK postal network)

For anyone sending a parcel from the UK or Ireland, the implication is straightforward: your tracking number is the only proof of progress. Keep the receipt, note the format, and if the status doesn’t update within two working days, contact the carrier directly. Waiting without action only delays resolution.

Frequently asked questions

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