subdomain-takeover

subdomain-takeover is an agent for Claude Code from H-mmer/pentest-agents. It costs 40 tokens per session (991 once invoked), scanned A, original, no licence file.

An agent for finding subdomain takeovers, where a subdomain still points to a cloud service or other provider that no longer belongs to the organisation.

In plain words
What is it for?
Use it to check subdomains for dangling DNS records linked to unclaimed cloud resources, expired services, or removed infrastructure.
Why use it?
It helps locate abandoned DNS records that could allow someone else to claim the service and serve content from the organisation's subdomain.

Agent for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model in frontmatter.

Good fit Use it to check subdomains for dangling DNS records linked to unclaimed cloud resources, expired services, or removed infrastructure.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/h-mmer/pentest-agents/subdomain-takeover
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/H-mmer/pentest-agents

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for subdomain-takeover

README.md
[![agentmods](https://agentmods.dev/badge/agents/h-mmer/pentest-agents/subdomain-takeover/github.svg)](https://agentmods.dev/agents/h-mmer/pentest-agents/subdomain-takeover)
Your own site
<a href="https://agentmods.dev/agents/h-mmer/pentest-agents/subdomain-takeover"><img src="https://agentmods.dev/badge/agents/h-mmer/pentest-agents/subdomain-takeover/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for subdomain-takeover

Your own site · 80×15
<a href="https://agentmods.dev/agents/h-mmer/pentest-agents/subdomain-takeover"><img src="https://agentmods.dev/badge/agents/h-mmer/pentest-agents/subdomain-takeover.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 991 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00040 $0.00991
Opus 5 $0.00020 $0.00495
Sonnet 5 $0.00008 $0.00198
Haiku 4.5 $0.00004 $0.00099

Measured 9d ago against content hash dd57d51444b6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

subdomain-takeover scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/agents/subdomain-takeover.md · 74 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 74 lines · 40 tokens per session scan A dd57d51444b6

Subscribe to this mod's changes

subdomain-takeover is an agent published in the GitHub repository H-mmer/pentest-agents (836 stars, last pushed 2mo ago), with no licence file. It adds 40 tokens to every session and 991 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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