Sending a letter or parcel should be simple — until you’re staring at a tracking page that hasn’t moved in days. This guide walks you through how tracking numbers work, where to find them, and what to do when updates go quiet, whether you’ve used the Post Office in the UK or An Post in Ireland.
Tracking number length: 9–27 characters · An Post international coverage: 200+ countries · Post Office tracking service: Free with online tracking · An Post tracking contact: Available on website
Quick snapshot
- Use reference number on receipt (Visiwise Blog)
- 9-27 characters (Visiwise Blog)
- Track online or via app (Visiwise Blog)
- Track on anpost.com
- International coverage 200+ countries
- Registered post and passport tracking
- Use An Post for Irish exports
- Royal Mail for UK exports
- Statuses may show partner updates
- Check number format (USPS Review)
- Wait 24 hours for first update (USPS Review)
- Contact support if issues persist (USPS Review)
4 key areas, one pattern: every service relies on a unique reference number, but the way you use it and the statuses you see differ between carriers.
| Label | Value |
|---|---|
| Tracking number length | 9–27 characters |
| Countries covered by An Post | 200+ |
| Post Office tracking service | Free with online tracking |
| An Post tracking contact | Available on website |
How to Track a Letter or Parcel Using a Post Office Tracking Number
Where to find your tracking number on a Post Office receipt
- The tracking number is printed on the receipt given at the counter (Visiwise Blog)
- Look for a barcode and a reference number — usually at the bottom or side of the receipt
- Save the receipt; without it, you may lose access to tracking
The implication: keep that paper slip until the item arrives. Many people toss it and later struggle to locate their tracking ID.
What format is my tracking number?
- Post Office tracking numbers are 9–27 characters long
- Usually starts with letters (e.g., “GB” or “RH”) followed by a mix of letters and numbers
- No spaces or special characters — if you copy it wrong, tracking won’t work
The catch: a single typo will return “tracking number not found”. Double-check before entering.
Tracking International Shipments with An Post
How to track an international parcel on the An Post website
- Go to anpost.com/tracking and enter your reference number
- International shipments are tracked to over 200 countries
- Statuses may show updates from partner carriers when the parcel leaves Ireland
The pattern: An Post acts as the originating carrier, but once the parcel hands off, local postal services provide the final scans.
What tracking statuses to expect for international deliveries
- “Pre-shipment” – tracking created but not yet scanned
- “In transit” – moving through the network (GoComet Blog)
- “Delivered” – final scan at destination
- Delays can occur during customs clearance or transfer between services
The pattern: international tracking is reliable but requires patience during carrier handovers.
How to Track a Registered Post or Passport with An Post
Tracking registered post via An Post
- Registered post tracking is available on An Post’s website
- Enter the tracking number from your receipt; you’ll see delivery confirmations
- Signature-on-delivery details are usually displayed once delivered
What this means: registered post gives you proof of posting and delivery — ideal for important documents.
Passport tracking with An Post – step by step
- Passport applications can be tracked using the same system
- Use the reference number provided by the Passport Office
- Check the An Post tracking page until status shows “delivered”
- If no update after 5 business days, contact customer support
Passport delivery is time-sensitive. An Post’s tracking lets you know exactly when the document arrives, so you can ensure someone is home to receive it.
The pattern: passport tracking provides crucial timing to ensure someone is home to receive it.
An Post Tracking Contact and Support Information
An Post customer service phone number
- Contact phone number is available on the official website (USPS Contact Us) — but for An Post, use their dedicated help page
- Support hours: typically Monday–Friday, 8:30am–5:30pm
- Online chat is also available during business hours
The trade-off: phone lines can be busy during peak periods; online chat often has shorter wait times.
Online tracking help and FAQs
- The An Post website has a comprehensive FAQ section covering common tracking issues
- You can also email customer service for non-urgent queries
- Check the official FAQs before calling — your question may already be answered
The implication: self-service is quickest. The FAQ covers most “tracking number not found” and “delayed delivery” scenarios.
Troubleshooting Post Office and An Post Tracking Issues
What to do if your tracking number is not recognised
- Wait 24–48 hours after shipping — the number may not be active yet (USPS Review)
- Double-check for typos or extra spaces (Visiwise Blog)
- Contact the sender to confirm the parcel has been dispatched
- If still unrecognised, visit your local post office with the receipt
The pattern: most “not found” errors are caused by premature checking or input errors. A 48-hour wait solves most cases.
Why is my tracking status not updating?
- Tracking updates may stall between facilities without scans (GoComet Blog)
- High package volume, especially during holidays, can delay scans (Visiwise Blog)
- Refresh your browser or clear cache if the page doesn’t load (USPS Review)
- If no update after 48 hours, contact customer service (GoComet Blog)
Stalled tracking doesn’t always mean a lost parcel. Gaps of 1–2 days between scans are routine, especially for international or economy services.
The pattern: gaps of 1–2 days between scans are routine and not necessarily a sign of loss.
“Track your packages with ease. Stay updated on the status and whereabouts of your items in real-time.”
— An Post official website
“You’ll need the reference number on your Post Office receipt to track your items; This number will be 9-27 characters.”
— Post Office UK
For first-time users or those who have misplaced a receipt, the lesson is simple: keep the slip, note the number, and give the system a day to activate. For first-time users, keeping the receipt and noting the number can mean the difference between a smooth tracking experience and a frustrating one.
Related reading: USPS Tracking Not Updating In Transit · USPS Tracking Troubleshooting Guide
Frequently asked questions
Can I track a parcel without a tracking number?
No — without the reference number or barcode from your receipt, tracking is not possible. Contact the sender to retrieve the number.
What does “tracking number not found” mean?
It usually means the number hasn’t been activated in the system yet, or you entered it incorrectly. Wait 24–48 hours and try again.
How long does it take for a tracking number to start working?
Typically 24 to 48 hours after the item is dropped off. Some services activate faster, but patience is recommended.
Does An Post track all parcels automatically?
Most services that include a tracking number are tracked. Basic economy may not include tracking — check with the sender.
Can I track a post office tracking number on the Royal Mail website?
Yes — if the item was sent via Royal Mail, use the same reference number on royalmail.com.
Is there a mobile app for Post Office tracking?
Both Royal Mail and An Post offer mobile apps with tracking features. Download from official app stores.
Rachel Walsh leads fact-checking, source verification and corrections at Aussie Report.