cnames vs SurfaceDiff: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros and cons, compared head to head.
cnames is a free external attack surface management tool. SurfaceDiff is a commercial external attack surface management tool by SurfaceDiff. Compare features, ratings, integrations, and community reviews side by side to find the best external attack surface management fit for your security stack. Independent and vendor-neutral: our scores and rankings are earned, never bought — sponsored placement is always labeled.
CST VerdictBased on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:
Security teams managing large subdomain inventories who need to quickly identify third-party service dependencies will find cnames valuable for that single, unglamorous job. The tool does one thing well: bulk CNAME resolution at no cost, which means you can run it repeatedly without justifying recurring spend to procurement. This is a CLI utility, not a platform; it won't replace your external attack surface management tool, but it will save time in the reconnaissance phase before you feed results into one.
Data verified Sep 2026
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