# tko-subs

tko-subs is an External Attack Surface Management product. It runs on-premises. Pricing is free.

A tool for detecting and taking over subdomains with dead DNS records

Checked October 2026.

## What is tko-subs?

A tool that can help detect and takeover subdomains with dead DNS records.

This tool is designed to help security researchers and penetration testers identify potential vulnerabilities in DNS infrastructure.

Features:

* Detects subdomains with dead DNS records
* Takes over subdomains with dead DNS records
* Provides a list of detected subdomains

Note: This tool is for educational purposes only and should not be used to engage in illegal activities.

Tags: Security Research, Subdomain Enumeration

## Where it fits in your security program (NIST CSF 2.0)

- [Identify](https://cybersectools.com/guides/building-identify-program-small-team): helps you know your assets and your risks.

## Quick facts

- Category: [Exposure & Vulnerability Management](https://cybersectools.com/categories/exposure-vulnerability-management) · [External Attack Surface Management](https://cybersectools.com/categories/external-asm)
- Deployment: On-Premises
- Company size fit: Startup, SMB, Mid-Market, Enterprise
- Pricing model: Free
- GitHub stars: 766
- Website: github.com

## Where it ranks

tko-subs is not a pick on the current [Best Attack Surface Management Solutions for Business](https://cybersectools.com/shortlists/best-attack-surface-solutions).

## tko-subs FAQ

### What is tko-subs?

tko-subs is a product in the External Attack Surface Management category. It covers Security Research and Subdomain Enumeration.

### What is the pricing for tko-subs?

tko-subs is free. Download and setup instructions are at https://github.com/anshumanbh/tko-subs/.

### What are alternatives to tko-subs?

Alternatives to tko-subs listed on CybersecTools:

1. [ctlogs.dev](https://cybersectools.com/tools/ctlogsdev) - Fast Certificate Transparency search and JSON API for subdomain reconnaissance. (Commercial)
2. [Searchlight Exposure](https://cybersectools.com/tools/assetnote-attack-surface-management-tool) - ASM platform that scans external attack surfaces hourly for vulnerabilities (Commercial)
3. [Ceeyu Digital Footprint Monitoring](https://cybersectools.com/tools/ceeyu-digital-footprint-monitoring) - Automated digital asset discovery and monitoring for external attack surface (Commercial)
4. [ThreatDefence Integrated ASM](https://cybersectools.com/tools/threatdefence-integrated-asm) - ASM platform monitoring external attack surface, dark web leaks & 3rd-party risks. (Commercial)
5. [TRaViS](https://cybersectools.com/tools/travis) - AI-enhanced EASM platform for external attack surface discovery and monitoring. (Commercial)

Compare all tko-subs alternatives at [https://cybersectools.com/alternatives/tko-subs](https://cybersectools.com/alternatives/tko-subs)

### What deployment and organization size does tko-subs fit?

tko-subs is available as on-premises software. It is listed for startups, small businesses, mid-market companies and enterprises. It is free.

## Compare tko-subs with similar solutions

- [tko-subs vs ctlogs.dev](https://cybersectools.com/compare/ctlogsdev-vs-tko-subs)
- [tko-subs vs Searchlight Exposure](https://cybersectools.com/compare/tko-subs-vs-assetnote-attack-surface-management-tool)
- [tko-subs vs Ceeyu Digital Footprint Monitoring](https://cybersectools.com/compare/ceeyu-digital-footprint-monitoring-vs-tko-subs)

All alternatives to tko-subs: [/alternatives/tko-subs](https://cybersectools.com/alternatives/tko-subs)

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Source: https://cybersectools.com/tools/tko-subs

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More on tko-subs: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=product-md