[Yandex Cloud documentation](../../index.md) > [Yandex SmartCaptcha](../index.md) > Concepts > Public IP addresses

# SmartCaptcha public IP addresses

For SmartCaptcha to run correctly, enable access to the following IPs:

| IPv4             | IPv6                      |
| ---------------- | ------------------------- |
| `84.201.151.229` | `2a0d:d6c1::1a:0:0:0:20e` |

They serve to ensure an API request sent to `/validate` runs correctly.

#### Useful links {#see-also}

* [Public IP address ranges in Yandex Cloud](../../vpc/concepts/ips.md)
* [IP address ranges used by Yandex](https://yandex.com/ips)