# Networks

{% hint style="info" %}
**For an exchange specific NAG, please contact the Circular labs team:**\
**<info@circularlabs.io>**
{% endhint %}

Both <mark style="color:blue;">**testnet**</mark> and <mark style="color:blue;">**mainnet**</mark> are available on the Circular network. After successfully integrating with the testnet, you can seamlessly transition to the mainnet by registering the same addresses and updating the network URL using the <mark style="color:purple;">**SetNagURL**</mark> method. <mark style="color:blue;">If the network URL is not specified, the library will default to the testnet.</mark>

```javascript
Circular.SetNAGURL(‘network URL’);
```