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blacklist-ip

Category: Security  ·  Sub-category: web-security  ·  Last updated:
Usar esta skill SIEMPRE que el usuario quiera comprobar si una IP, rango de IPs o dominio está en una lista negra (blacklist), RBL o DNSBL (Spamhaus, SORBS, Barracuda, UCEPROTECT, abuse.ch, etc.). Activar cuando se mencionen: lista negra, blacklist, DNSBL, RBL, IP listada/bloqueada, reputación de IP, spam blacklist, comprobar reputación de dominio/correo, deliverability de email, servidor SMTP bloqueado, IP marcada como spam/phishing/malware/botnet/ proxy abierto, o códigos de retorno de Spamhaus (127.0.0.x). También activar cuando el usuario proporcione una IP o fichero de IPs y pida: auditar reputación, verificar blacklisting, sacar de lista negra (delisting), o análisis forense de por qué un servidor de correo rebota. Repositorio de referencia: https://github.com/hackingyseguridad/listanegra
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Skill de auditoría de reputación IP contra RBL/DNSBL. El repositorio contiene varios scripts en shell con distintos grados de robustez, ficheros de listas/DNS de apoyo, una tabla completa de referencia de listas (LISTAS.md) y los códigos de retorno de Spamhaus documentados en el README.md. Este SKILL.md está verificado línea a línea contra el código real de cada script (no solo contra la documentación del README, que en algunos puntos no coincide con el comportamiento real — ver sección de advertencias más abajo).

What this skill does

blacklist-ip is a community-contributed Claude Code skill in the web-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/listanegra/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The blacklist-ip Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 154,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/listanegra
curl -L https://claudskills.com/skills/listanegra/SKILL.md \
  -o ~/.claude/skills/listanegra/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/listanegra/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/listanegra/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\listanegra\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the blacklist-ip Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/listanegra/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the blacklist-ip skill do?
Usar esta skill SIEMPRE que el usuario quiera comprobar si una IP, rango de IPs o dominio está en una lista negra (blacklist), RBL o DNSBL (Spamhaus, SORBS, Barracuda, UCEPROTECT, abuse.ch, etc.). Activar cuando se mencionen: lista negra, blacklist, DNSBL, RBL, IP listada/bloqueada, reputación de IP, spam blacklist, comprobar reputación de dominio/correo, deliverability de email, servidor SMTP bloqueado, IP marcada como spam/phishing/malware/botnet/ proxy abierto, o códigos de retorno de Spamhaus (127.0.0.x). También activar cuando el usuario proporcione una IP o fichero de IPs y pida: auditar reputación, verificar blacklisting, sacar de lista negra (delisting), o análisis forense de por qué un servidor de correo rebota. Repositorio de referencia: https://github.com/hackingyseguridad/listanegra
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the blacklist-ip skill?
Use blacklist-ip when your Claude Code task falls under the Security category — specifically in the web security area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use blacklist-ip" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the blacklist-ip skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. blacklist-ip is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
hackingyseguridad. (2026). blacklist-ip [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/listanegra/
BibTeX
@misc{listanegra-2026,
  author    = {hackingyseguridad},
  title     = {blacklist-ip [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/listanegra/}
}

Embed this skill

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Badge
[![ClaudSkills](https://claudskills.com/badge/listanegra.svg)](https://claudskills.com/skills/listanegra/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)
<script>
<script src="https://claudskills.com/embed/listanegra.js" async></script>
<iframe>
<iframe src="https://claudskills.com/embed/listanegra.html" width="100%" height="160" frameborder="0" loading="lazy" title="ClaudSkills: blacklist-ip"></iframe>

Security scan

Grade A · scanned 2026-07-20 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (network), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/listanegra/#security)

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More Security skills

Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
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