---
title: "Blocked IP addresses"
sidebar_label: "Blocked IP addresses"
description: "How to view blocked IP addresses, how to unblock an IP address"
sidebar_position: 4
---

import Formbricks from '@theme/MDXComponents/Formbricks'

# Blocked IP addresses

In case of a massive attack on a server that negatively affects the network infrastructure, the server IP address may be blocked for all incoming traffic using blackhole (RTBH).

Blocking is applied for 8 hours and can be extended if the attack continues. You will receive a ticket when a block is applied.

## View blocked IP addresses \{#view-blocked-ip-addresses}

1. In the [Control panel](https://my.selectel.ru/network/blocktools/blackhole), on the top menu, click **Products** and select **Network Incidents**.
2. Open the **Blocked IP addresses** tab. The blocking period is displayed for every blocked address.

## Unblock an IP address \{#unblock-ip-address}

1. Wait for the blocking period to end — it lasts 8 hours and is removed automatically if the attack has stopped. If you need to remove the block earlier, [create a ticket](https://my.selectel.ru/tickets/create/) and wait for a response from support with recommendations on the necessary actions.
2. Optional: to prevent a repeat attack and blocking:

   * change the server IP address;
   * connect [additional protection](/anti-ddos/about-anti-ddos.mdx#select-additional-protection).

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