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Correct fact in s10-upu post

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akp 2025-06-14 12:30:49 +01:00
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@ -5,9 +5,12 @@ publishedDate: 2025-03-11
updatedDate:
- 2025-03-12
- 2025-04-16
- 2025-06-14
imageURL: /blog/s10-upu/crazyfactory.jpg
tags:
- curiosities
links:
hackernews: https://news.ycombinator.com/item?id=44258633
---
Have you ever received a parcel from overseas? I did recently, from Switzerland!
@ -72,7 +75,7 @@ All in, the possible service indicator space looks like this:
### The Serial Number
This is just a serial number. It's exactly 8 digits long and is generated by the originating carrier as they see fit, provided they don't resue the same number within 12 months. In theory, this means a lost parcel can only be lost for 12 months before it vanishes from the world forever, but in reality, the S10 recommends not reusing a number within a minimum period of 24 months. Even then, you have 10 million parcels per service indicator per country available to be issued, so it's probably not going to be necessary for a carrier to reuse a number for a much longer period of time anyway.
This is just a serial number. It's exactly 8 digits long and is generated by the originating carrier as they see fit, provided they don't resue the same number within 12 months. In theory, this means a lost parcel can only be lost for 12 months before it vanishes from the world forever, but in reality, the S10 recommends not reusing a number within a minimum period of 24 months. Even then, you have 100 million parcels per service indicator per country available to be issued, so it's probably not going to be necessary for a carrier to reuse a number for a much longer period of time anyway.
### The Check Digit
@ -107,4 +110,10 @@ The square code on the left side is the data matrix, the barcode on the right is
---
# Update: 2026-06-14
An earlier version of this post said that there are 10 million serial numbers per service indicator, which is wrong; there are 100 million. Thank you to Jeff for pointing this out via email :)
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[^6]: Discussion of the placement of commas and links in this sentence made for an entertaining grammar-based discussion among friends.