---
title: "Block a client address or range"
method: POST
path: "/api/web_protection/blocklist/"
tags: ["Filters, rules and taint"]
---

# Block a client address or range

`POST /api/web_protection/blocklist/`

## Request

- Base URL: `https://eyalsec.com`
- URL: `https://eyalsec.com/api/web_protection/blocklist/`
- Auth: one of:
  - API key in header `X-API-Key`
  - API key in cookie `__Host-es2session`

Adds an IP address or CIDR range to your blocked clients and answers 201 with the entry (JSON body: address, optional reason, optional hours until it expires, 0 or absent = never, at most a year). A range wider than /8 (IPv4) or /32 (IPv6) is a 400. Adding an address that is already listed replaces its reason and expiry and makes it a manual entry. A full list is a 409. Adding works without Raise; the list is only enforced when block is on, which needs it. Cookie callers must pass CSRF.

This is a **write**: a read-only API key is refused with 403.

## Request body

- object
  - `address` string, required: An IPv4 or IPv6 address, or a CIDR range.
  - `reason` string: A note shown beside the entry, up to 200 characters.
  - `hours` integer: Hours until the entry expires; 0 or absent for never.

## Response `201`

Created.

- object

## Other responses

- `401`: The API key is missing, wrong, revoked or expired.
- `429`: A rate limit was hit, or the account is locked after wrong passwords. Retry-After gives the seconds to wait.
- `default`: An error. Check the status first; the body carries a short message, as JSON ({"error": "..."}) on most endpoints and as plain text on some. 400: malformed JSON, an invalid regex, an unreadable cursor or date, or an unknown value. 401: the API key is missing, wrong, revoked or expired. 403: a failed CSRF check, a read-only key trying to write, a product or feature not enabled on your account, a wrong password, or a write on an account limited to reading. 404: not found, including things that belong to another account. 409: conflict with the current state. 422: a field is missing or invalid. 429: a rate limit was hit, or the account is locked after wrong passwords. 500: something failed on our side.

---

[API](https://skmtc.dev/eyalsec/apis/eyalsec-api.md) · [All operations](https://skmtc.dev/eyalsec/apis/eyalsec-api/llms.txt) · [OpenAPI document](https://skmtc.dev/eyalsec/apis/eyalsec-api/revisions/dc7520689cf1?raw)