# 2. Select an OCN Node and register in OCN Registry

In order to connect a service to the OCN, you must choose which OCN node you want to connect to, and know the node's public wallet address. You will then request a registration token (Token\_A) from your selected node. 

{% hint style="info" %}
Access the full OCN technical documentation [here](https://shareandcharge.com/wp-content/uploads/2020/11/OCN-Documentation-v1.1.pdf).
{% endhint %}

## 1. Select a node

In order to connect a service to the Open Charging Network, you must decide which OCN Node you want to connect to.

### Test Network

To view public nodes available on the public test network and their wallet address, see "[Develop on the Test Network](/legacy-documentation/solutions-2023/open-charging-network/develop-on-the-test-network.md)". 

### Production Network

To view public nodes available on the public test network and their wallet address, see "[Develop on the Production Network](/legacy-documentation/solutions-2023/open-charging-network/develop-on-the-production-network.md)". 

## 2. Request a Token

Once you select a node operator that you want to connect to, you must:

1.  Know the OCN Identity (wallet address) of that OCN Node Operator ([from Step One above](#1.-select-a-node)).
2. Request a registration token (TOKEN\_A in OCPI terms). Note that this token is only temporary and will become invalid once the registration is complete.

## 3. Enter **Node** details in OCN Registry <a href="#enter-details-in-ocn-registry" id="enter-details-in-ocn-registry"></a>

After you have the public address of your public node and your registration token, you are now ready to create / update your OCN Identity on the OCN Registry. Follow the steps provided here: [Create and manage an OCN Identity](/legacy-documentation/solutions-2023/open-charging-network/create-and-manage-an-ocn-identity.md)


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