# Contact Record ID Numbering Sequence

**URL:** <https://community.hubspot.com/t/contact-record-id-numbering-sequence/103260>\
**Category:** CRM\
**Tags:** free\
**Created:** [March 22, 2024, 9:20pm UTC](https://community.hubspot.com/t/contact-record-id-numbering-sequence/103260 "2024-03-22T21:20:20Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![JoshWard001](https://avatars.discourse-cdn.com/v4/letter/j/f17d59/32.png) [@JoshWard001](https://community.hubspot.com/u/JoshWard001)\
**Post date:** [March 22, 2024, 9:20pm UTC](https://community.hubspot.com/t/contact-record-id-numbering-sequence/103260/1 "2024-03-22T21:20:20Z")

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Hi,

Can anyone tell me why my contact record ID numbering has suddenly changed for every new contact I add?

I use the record ID as the customers account and contract number in my day to day business.

 ![JoshWard001_0-1711142311923.png](https://d2qpr2jzcazej7.cloudfront.net/original/2X/a/ab5860db371c8361970c9e57abf138087a86e624.png)

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**Author:** ![Ben\_M](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/ben_m/32/2679_2.png) [@Ben\_M](https://community.hubspot.com/u/Ben_M)\
**Post date:** [March 22, 2024, 11:58pm UTC](https://community.hubspot.com/t/contact-record-id-numbering-sequence/103260/2 "2024-03-22T23:58:29Z")

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I don’t think the record IDs are sequential numbers. I was only able to find this information on record id’s but it doesn’t appear they are an auto-increment field as you were anticipating ( [https://developers.hubspot.com/docs/api/crm/understanding-the-crm](https://developers.hubspot.com/docs/api/crm/understanding-the-crm?_gl=1*1i2f7cr*_ga*MTYwMjUyNzYwNi4xNzEwMjgzODk5*_ga_LXTM6CQ0XK*MTcxMTE0Nzc1Ny4yMi4xLjE3MTExNDgyODQuNjAuMC4w)) . In this case, you could continue to use the ID as it will always be a unique identifier, or you could consider setting up your own unique ID property.

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**Author:** ![karstenkoehler](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/karstenkoehler/32/68554_2.png) [@karstenkoehler](https://community.hubspot.com/u/karstenkoehler)\
**Post date:** [March 23, 2024, 6:15am UTC](https://community.hubspot.com/t/contact-record-id-numbering-sequence/103260/3 "2024-03-23T06:15:28Z")

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Hi @JoshWard001,

> * * *
> 
> @JoshWard001 wrote:
> 
> Can anyone tell me why my contact record ID numbering has suddenly changed for every new contact I add?
> 
> * * *

Yes, this is an update that was pushed live in March and is explained here: [Increasing the size of contact record IDs](https://developers.hubspot.com/changelog/increasing-the-size-of-contact-record-ids)

There is also an ongoing thread for discussing here: [https://community.hubspot.com/t5/Developer-Announcements/Increasing-the-size-of-contact-record-IDs/m-p/890611#M571](https://community.hubspot.com/t5/Developer-Announcements/Increasing-the-size-of-contact-record-IDs/m-p/890611#M571)

Best regards!

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<div class="post-metadata">

**Author:** ![JoshWard001](https://avatars.discourse-cdn.com/v4/letter/j/f17d59/32.png) [@JoshWard001](https://community.hubspot.com/u/JoshWard001)\
**Post date:** [March 23, 2024, 9:10am UTC](https://community.hubspot.com/t/contact-record-id-numbering-sequence/103260/4 "2024-03-23T09:10:34Z")

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Eurghhhh, this is rather annoying. I appreciate the need for updates but it’s going to cause chaos for my existing records and new ones!