# Assetnote ASM vs massdns: side-by-side comparison (2026)

[Assetnote ASM](https://cybersectools.com/tools/assetnote-asm) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Assetnote](https://cybersectools.com/companies/assetnote). [massdns](https://cybersectools.com/tools/massdns) is a free [external attack surface management](https://cybersectools.com/categories/external-asm) solution. Features, integrations, deployment and the company behind each one, side by side.

Need the answer fast? [Best Attack Surface Management Solutions for Business](https://cybersectools.com/shortlists/best-attack-surface-solutions) picks Palo Alto Networks Cortex Xpanse, Microsoft Defender EASM, Mandiant Attack Surface Management and 4 more.

## Side-by-side comparison

| | Assetnote ASM | massdns |
|---|---|---|
| Pricing model | Commercial | Free |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | Cloud | On-Premises |
| Company size fit | Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| GitHub stars | – | 3,417 |
| Last commit | – | Jul 2025 |
| Company | Assetnote | – |
| Headquarters | – | – |

### Use cases and capabilities

| | Assetnote ASM | massdns |
|---|---|---|
| Security Scanning | Yes | – |
| Reconnaissance | – | Yes |
| Subdomain Enumeration | – | Yes |
| Security Tools | – | Yes |

### Core features

**Assetnote ASM**

10 features listed. Sign in on the page to see them.

**massdns**

No features listed.

### Integrations

**Assetnote ASM**

2 integrations listed. Sign in on the page to see them.

**massdns**

No integrations listed.

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [Assetnote ASM](https://cybersectools.com/tools/assetnote-asm) fits if you want a cloud product.
- [massdns](https://cybersectools.com/tools/massdns) fits if you need to run it on your own servers, you are a startup or a small business, you need a free product and you want an open-source product.

## Assetnote ASM vs massdns FAQ

Common questions when comparing Assetnote ASM vs massdns for external attack surface management.

### What is the difference between Assetnote ASM and massdns?

**Assetnote ASM**: External attack surface management platform with continuous asset discovery. Built by Assetnote.

**massdns**: A high-performance DNS stub resolver for bulk lookups and reconnaissance (subdomain enumeration).

The table above shows where their features, integrations, deployment and company size fit differ.

### Who makes Assetnote ASM and massdns?

**Assetnote ASM** is made by Assetnote founded in 2018-01-01T00:00:00.000Z. **massdns** is open-source with 3,417 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Assetnote ASM a good alternative to massdns?

Often, yes. Assetnote ASM and massdns are both External Attack Surface Management products. Key differences: Assetnote ASM is Commercial while massdns is Free, massdns is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Assetnote ASM vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/assetnote-asm-vs-ddactic-attack-surface-discovery)
- [Assetnote ASM vs Cylana EASM](https://cybersectools.com/compare/assetnote-asm-vs-cylana-easm)
- [Assetnote ASM vs TRaViS](https://cybersectools.com/compare/assetnote-asm-vs-travis)
- [massdns vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/ddactic-attack-surface-discovery-vs-massdns)
- [massdns vs Cylana EASM](https://cybersectools.com/compare/cylana-easm-vs-massdns)
- [massdns vs TRaViS](https://cybersectools.com/compare/massdns-vs-travis)

## Alternatives to each

- [See all Assetnote ASM alternatives](https://cybersectools.com/alternatives/assetnote-asm)
- [See all massdns alternatives](https://cybersectools.com/alternatives/massdns)

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Source: https://cybersectools.com/compare/assetnote-asm-vs-massdns

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/assetnote-asm.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on Assetnote ASM and massdns: 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=compare-md