# Reuse Application ID when creating a new app

**URL:** <https://www.thethingsnetwork.org/forum/t/reuse-application-id-when-creating-a-new-app/55420>\
**Category:** Application Development\
**Created:** [February 23, 2022, 10:39am UTC](https://www.thethingsnetwork.org/forum/t/reuse-application-id-when-creating-a-new-app/55420 "2022-02-23T10:39:29Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mmijoski](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/mmijoski/32/35697_2.png) [@mmijoski](https://www.thethingsnetwork.org/forum/u/mmijoski)\
**Post date:** [February 23, 2022, 10:39am UTC](https://www.thethingsnetwork.org/forum/t/reuse-application-id-when-creating-a-new-app/55420/1 "2022-02-23T10:39:29Z")

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Can an application ID be reused once the application is deleted?  
I have a problem currently, where `/api/v3/applications/{id}/` returns a Not Found response (which is good because the app was deleted), however, when trying to create an application with the same ID, I get a 409 Duplicate response. Is this intended behaviour to not reuse application IDs, and if so, is there a way to reactivate the app?

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**Author:** ![kersing](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/kersing/32/44777_2.png) [@kersing](https://www.thethingsnetwork.org/forum/u/kersing)\
**Post date:** [February 23, 2022, 1:04pm UTC](https://www.thethingsnetwork.org/forum/t/reuse-application-id-when-creating-a-new-app/55420/2 "2022-02-23T13:04:37Z")

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Application IDs as in the alphanumerical identifier can not be reused. As that is just a simple identifier in at TTN side not related to anything programmed in a node not being able to reuse it should not be an issue.  
Why would you need to reactivate that particular application? Why is its ID so precious?

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**Author:** ![kschiffer](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/kschiffer/32/46792_2.png) [@kschiffer](https://www.thethingsnetwork.org/forum/u/kschiffer)\
**Post date:** [February 23, 2022, 1:10pm UTC](https://www.thethingsnetwork.org/forum/t/reuse-application-id-when-creating-a-new-app/55420/3 "2022-02-23T13:10:58Z")

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Indeed, application IDs cannot be reused immediately after being deleted. This has a technical background and prevents other users from potentially gaining access to data of deleted applications.

Out of curiosity, did you see the following modal when deleting the app:  
 ![image](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/3/0/30510a008fa8eecaa002b53baabfa91a93d8db0f.png)

It is notifying about this fact. I guess it was overlooked.

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**Author:** ![descartes](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/descartes/32/47220_2.png) [@descartes](https://www.thethingsnetwork.org/forum/u/descartes)\
**Post date:** [February 23, 2022, 4:45pm UTC](https://www.thethingsnetwork.org/forum/t/reuse-application-id-when-creating-a-new-app/55420/4 "2022-02-23T16:45:58Z")

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Put a picture of a unicorn & a LOLcat on, that may help!