---
id: "blocklist"
kind: "glossary-term"
title: "blocklist"
language: "en"
category: "Security and abuse"
updated: "2026-10-04T14:01:23Z"
canonical: "https://tldlog.com/glossary/blocklist/"
translations:
  es: "https://tldlog.com/es/glosario/lista-bloqueo/"
  de: "https://tldlog.com/de/glossar/sperrliste/"
  fr: "https://tldlog.com/fr/glossaire/liste-blocage/"
  it: "https://tldlog.com/it/glossario/blocklist/"
  pt-BR: "https://tldlog.com/pt/glossario/lista-bloqueio/"
  ru: "https://tldlog.com/ru/glossariy/spisok-blokirovki/"
  zh-Hans: "https://tldlog.com/zh/cihui/zuzhi-liebiao/"
---

# blocklist

A list of domains or IP addresses reported as sources of spam, phishing or malware, published so that mail servers, resolvers and browsers can block them. Many are queried over the DNS and are known as DNS-based blocklists. Being listed can stop a domain's email from being delivered.

## related terms

- [Spamhaus](https://tldlog.com/glossary/spamhaus/)
- [SURBL](https://tldlog.com/glossary/surbl/)
- [domain reputation](https://tldlog.com/glossary/domain-reputation/)
- [spam](https://tldlog.com/glossary/spam/)
- [RPZ](https://tldlog.com/glossary/rpz/)