Assetnote ASM vs massdns: side-by-side comparison (2026)
Assetnote ASM is a commercial external attack surface management solution by Assetnote. massdns is a free external attack surface management solution. Features, integrations, deployment and the company behind each one, side by side.
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External attack surface management platform with continuous asset discovery
A high-performance DNS stub resolver for bulk lookups and reconnaissance (subdomain enumeration)
Side-by-side comparison
Feature
Assetnote ASM
massdns
Pricing model
Commercial
Free
Category
External Attack Surface Management
External Attack Surface Management
Deployment and fit
Deployment type
Cloud
On-Premises
Company size fit
Mid-Market, Enterprise
Startup, SMB, Mid-Market, Enterprise
Open source
GitHub stars
–
3,417
Last commit
–
Jul 2025
Company
Company
Assetnote
–
Use cases and capabilities
Security Scanning
Yes
No
Reconnaissance
No
Yes
Subdomain Enumeration
No
Yes
Security Tools
No
Yes
Core features
10 features listed
No features listed
Integrations
2 integrations listed
No integrations listed
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