What is the difference between Assetnote ASM vs censys-subdomain-finder?

**Assetnote ASM**: External attack surface management platform with continuous asset discovery. built by Assetnote. Core capabilities include Hourly automated asset discovery and scanning, Asset enrichment and contextualization, Exploit-based vulnerability verification.. **censys-subdomain-finder**: A tool for performing subdomain enumeration using Censys API.. Both serve the External Attack Surface Management market but differ in approach, feature depth, and target audience.

Who makes Assetnote ASM vs censys-subdomain-finder?

**Assetnote ASM** is developed by Assetnote. **censys-subdomain-finder** is open-source with 818 GitHub stars. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Is Assetnote ASM a good alternative to censys-subdomain-finder?

Assetnote ASM and censys-subdomain-finder serve similar External Attack Surface Management use cases: both are External Attack Surface Management tools. Key differences: Assetnote ASM is Commercial while censys-subdomain-finder is Free, censys-subdomain-finder is open-source. Review the feature comparison above to determine which fits your requirements.

Assetnote ASM vs censys-subdomain-finder: 2026 Comparison Guide | CybersecTools

Assetnote ASM vs censys-subdomain-finder: Side-by-Side Comparison (2026)

Features, pricing, ratings, and pros & cons — compared head-to-head.

Assetnote ASM is a commercial external attack surface management tool by Assetnote. censys-subdomain-finder is a free external attack surface management tool. Compare features, ratings, integrations, and community reviews side by side to find the best external attack surface management fit for your security stack.

CST Verdict

Based on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:

Assetnote ASM

Mid-market and enterprise security teams managing sprawling external infrastructure will get the most from Assetnote ASM because its hourly asset discovery actually catches exposures before your business units spin up new services, not weeks after. The platform covers ID.AM and DE.CM across NIST CSF 2.0, meaning you're building a real asset inventory while monitoring it continuously, and the exploit-based verification eliminates the noise that buries actionable findings in traditional scanners. Skip this if your organization lacks the headcount to operationalize a workflow-driven program; Assetnote's strength is enabling lean teams to prioritize, not giving you a dashboard to ignore.

Data verified May 2026