# Censys Attack Surface Management vs massdns: side-by-side comparison (2026)

[Censys Attack Surface Management](https://cybersectools.com/tools/censys-attack-surface-management) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Censys](https://cybersectools.com/companies/censys). [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, Google Mandiant Attack Surface Management and 4 more.

## Side-by-side comparison

| | Censys Attack Surface Management | 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 | Censys | – |
| Headquarters | – | – |

### Use cases and capabilities

| | Censys Attack Surface Management | massdns |
|---|---|---|
| Reconnaissance | Yes | Yes |
| Network Discovery | Yes | – |
| Blue Team | Yes | – |
| Subdomain Enumeration | – | Yes |
| Security Tools | – | Yes |

### Core features

**Censys Attack Surface Management**

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

**massdns**

No features listed.

### Integrations

**Censys Attack Surface Management**

16 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.

- [Censys Attack Surface Management](https://cybersectools.com/tools/censys-attack-surface-management) 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.

## Censys Attack Surface Management vs massdns FAQ

Common questions when comparing Censys Attack Surface Management vs massdns for external attack surface management.

### What is the difference between Censys Attack Surface Management and massdns?

**Censys Attack Surface Management**: Internet intelligence platform for asset discovery and attack surface mapping, built by Censys.

**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 Censys Attack Surface Management and massdns?

**Censys Attack Surface Management** is made by Censys. **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 Censys Attack Surface Management a good alternative to massdns?

Often, yes. Censys Attack Surface Management and massdns are both External Attack Surface Management products, and both cover Reconnaissance. Key differences: Censys Attack Surface Management 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

- [Censys Attack Surface Management vs Cylana EASM](https://cybersectools.com/compare/censys-attack-surface-management-vs-cylana-easm)
- [Censys Attack Surface Management vs MGM Security Partners recon me](https://cybersectools.com/compare/censys-attack-surface-management-vs-mgm-security-partners-recon-me)
- [Censys Attack Surface Management vs CyCognito EASM Platform](https://cybersectools.com/compare/censys-attack-surface-management-vs-cycognito-easm-platform)
- [massdns vs Cylana EASM](https://cybersectools.com/compare/cylana-easm-vs-massdns)
- [massdns vs MGM Security Partners recon me](https://cybersectools.com/compare/massdns-vs-mgm-security-partners-recon-me)
- [massdns vs CyCognito EASM Platform](https://cybersectools.com/compare/cycognito-easm-platform-vs-massdns)

## Alternatives to each

- [See all Censys Attack Surface Management alternatives](https://cybersectools.com/alternatives/censys-attack-surface-management)
- [See all massdns alternatives](https://cybersectools.com/alternatives/massdns)

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Source: https://cybersectools.com/compare/censys-attack-surface-management-vs-massdns

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More on Censys Attack Surface Management 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