# Blacklist Checker

- **Website:** <https://blacklistchecker.com>
- **Primary alias:** `blacklistchecker.com`

## Description

Blacklist Checker is an email deliverability and reputation tool that helps businesses identify whether an email address, domain name, or IP address appears on email blacklists. Also known as realtime blacklists, DNSBLs, or RBLs, these lists are used by email service providers, and a listing can prevent some messages from being delivered.

The service checks targets against more than 100 blacklists, including Spamhaus, Barracuda, SpamCop, SORBS, and UCEPROTECT. Users can run checks through the free checker or use the API to perform real-time tests and monitor addresses over time. The monitoring service checks daily and sends an email alert if a monitored target is listed, helping users investigate potential reputation issues.

Designed for developers, the API provides RESTful endpoints, JSON responses, normalized objects, a developer dashboard, and one-to-one support. Blacklist Checker offers API documentation, paid pricing plans, and a free tier with 50 requests per month. It also promotes Mailreef Unlimited Mailboxes for businesses looking to scale cold email outreach.

## Industries

- 🖥 Computers Electronics and Technology
- 🖥 Email _(under Computers Electronics and Technology)_

## Logos & icons

- logo _(primary)_ — PNG, SVG — [download](https://cdn.brandfetch.io/idldZ7qUJD/w/820/h/222/theme/dark/logo.png?c=1bxid64Mup7aczewSAYMX&t=1790883725654)

## Colors

| Name | Hex | Theme |
| --- | --- | --- |
| Azure Radiance | #0078ff | accent |
| Cod Gray | #121212 | dark |
| Havelock Blue | #63a2da | light |

## Fonts

- sans-serif — asset _(custom)_
- ui-sans-serif — asset _(custom)_

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_Source: <https://brandfetch.com/blacklistchecker.com>_
_See [/llms.txt](/llms.txt) for a full list of agent-readable pages, and [/auth.md](/auth.md) for how agents authenticate._