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altdns is a free external attack surface management tool. Cobalt Attack Surface Monitoring is a commercial external attack surface management tool by Cobalt. Compare features, ratings, integrations, and community reviews side by side to find the best external attack surface management fit for your security stack.
Based on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:
Security teams hunting for overlooked subdomains in external attack surface reconnaissance will find altdns invaluable because it generates permutations that standard enumeration tools miss, catching typosquatting and subdomain variations that land in your blind spots. The 2,439 GitHub stars reflect adoption by practitioners who've validated the mutation logic against real-world domain configurations. Skip this if you need a managed UI or integration with your existing EASM platform; altdns is a CLI-first tool that demands operator familiarity and manual orchestration into your scanning workflow.
Cobalt Attack Surface Monitoring
Mid-market and enterprise security teams that struggle to track what's actually exposed on the internet should start here; Cobalt Attack Surface Monitoring finds shadow IT and unmapped assets that traditional vulnerability scans miss through daily domain reconnaissance. The daily scan cadence and first-seen timestamps give you continuous monitoring that actually maps to NIST ID.AM and ID.RA, which most ASM tools only pretend to cover. Skip this if your organization doesn't have verified domain ownership set up or if you need pentest orchestration beyond coverage tracking; Cobalt is asset discovery and exposure evaluation, not a replacement for active vulnerability management.
A tool for generating permutations, alterations and mutations of subdomains and resolving them
Continuous external asset discovery and monitoring with daily domain scans.
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Common questions about comparing altdns vs Cobalt Attack Surface Monitoring for your external attack surface management needs.
altdns: A tool for generating permutations, alterations and mutations of subdomains and resolving them..
Cobalt Attack Surface Monitoring: Continuous external asset discovery and monitoring with daily domain scans. built by Cobalt. headquartered in United States. Core capabilities include Automated discovery and cataloging of all internet-facing assets under verified domains, Daily domain scans to detect new hosts, port modifications, and certificate updates, Shadow IT identification by mapping previously unknown external assets..
Both serve the External Attack Surface Management market but differ in approach, feature depth, and target audience.
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