# Preparation: Reserve a ParaID

The ParaID (Parachain ID) is a unique identifier for a parachain or parathread on the Polkadot, Rococo, or Kusama networks. To reserve a ParaID, follow these steps:

{% hint style="info" %}
[Polkadot-JS](https://polkadot.js.org/) comprises a suite of tools that interface with the Polkadot blockchain, its parachains, and testnets such as Rococo in detail. If you are new to Polkadot, referring to this [guide ](https://wiki.polkadot.network/docs/learn-polkadot-js-guides)is recommended.
{% endhint %}

1\. [**Open Polkadot-js APP**](https://polkadot.js.org/apps/#/explorer)**:** Navigate to the Network tab. 

2\. **Select Parachains**:  Choose "Parathreads" and then click on "ParaID."

<figure><img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXeNCBD_C-YFdUlKXNc9h7Kb36jMKQlt9zlu3tZiBDwj5TSGNbQxZpGN1ZGZBqIejuJLsTgAE8cWcISyRJiQMhhdKX4tOPiJDR3YQ2C0RiBnL9nWwI4Vug5EZIg54_Etc3bdE0S49XFRyIh4_u2MfH6X9j6D?key=OcR147ab-8YRteQSQ4SssQ" alt="" width="563"><figcaption><p>Polkadot JS APP  Interface</p></figcaption></figure>

3\. **Submit a Request:** Choose an account and submit your request.

<figure><img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXc2Gr77CUPVPKwr4n2rs41gjC4dW7IEuP1VYh3tHblfjZeVNhwbubhSRQpofnBxhjDUkKVCC-b1v9xgzwjVeCZHZVt9jWl85CP7Ar9o52_QI79mGZ5dbXrUK0yZYItrtuv6gqSdvwcmXb3e01U3aqfCCJMe?key=OcR147ab-8YRteQSQ4SssQ" alt="" width="563"><figcaption></figcaption></figure>

**Note:**

\- A deposit is required to reserve your ParaID.

&#x20; \- For Rococo testnet: The deposit amount is 40 ROC, you may visit the [Polkadot Faucet](https://faucet.polkadot.io/rococo) to get ROCs as test token.

&#x20; \- For Kusama and Polkadot: The deposit amount 40 KSM / 100 DOT respectively.

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Once you have reserved your ParaID, you can start using Magnet Stack.