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---
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id: portnum
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title: Meshtastic Port Numbers
sidebar_label: Port Numbers
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---
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Any new app that runs on the device or via sister apps on phones/PCs should pick and use a unique "portnum" for their applications use.
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The current list of port numbers can be found listed in the [protobufs](https://buf.build/meshtastic/protobufs/docs/main:meshtastic#meshtastic.CriticalErrorCode)
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## Assignment
PortNums should be assigned by the following ranges:
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| Portnum | Usage |
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| :-----: | :--------------------------------------------------------------------------------------------------------------------- |
| 0-63 | Core Meshtastic use, do not use for third party apps. |
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| 64-127 | Registered 3rd party apps, send in a pull request that adds a new entry to portnums.proto to register your application |
| 256-511 | Use one of these portnums for your private applications that you do not want to register publicly |
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All other values are reserved.
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## Integration
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If you are making a new app using Meshtastic, please send a pull request to add your chosen "portnum" to this master table.
