Shodan Alternative: API-Based Attack Surface Scanning for Security Teams

Shodan is the benchmark. If you work in security research, penetration testing, or attack surface management, you have almost certainly used it. Its database of internet-connected devices is unmatched in breadth, and its API is one of the most referenced in the field.

But "best known" and "best fit" are not always the same thing. For teams running continuous domain-focused ASM workflows — especially MSSPs managing multiple clients — the question is not whether Shodan is good (it is), but whether a single data source is enough.

This article compares Shodan directly with DFIR Platform's Exposure Scanner, covering what each does well, where each falls short, and how to think about cost when building an automated scanning workflow.

What Shodan Does Well

Shodan has earned its reputation. Here is where it genuinely excels:

Internet-wide scan database and historical data. Shodan crawls billions of IP addresses continuously, indexing open ports, service banners, and device metadata. Its historical data lets you query what a host looked like weeks or months ago — a capability that is hard to replicate independently.

Ad-hoc research and IoT discovery. For hunting exposed industrial control systems, misconfigured databases, or specific device types across the internet, Shodan's query language is powerful and mature. The community has built an extensive library of search filters (called "dorks") for virtually every use case.

Vulnerability research. Shodan maps CVEs to exposed services. If you want to know how many hosts on the internet are running a vulnerable version of OpenSSH, Shodan gives you that answer quickly.

Transparent, reasonable pricing. Shodan Membership is a one-time $49 purchase that unlocks more search results. The API at the Small Business tier is $59/month — publicly documented and affordable for individual researchers and small teams. There is no ambiguity about what you get.

Established community and tooling. The Shodan Python library, CLI, and third-party integrations are mature. If your workflow already uses Shodan, swapping it out has a real integration cost.

Where Shodan Falls Short for ASM

Despite its strengths, Shodan was designed primarily as an internet scanner, not as a domain-centric attack surface management tool. That distinction matters when you are trying to build a continuous, comprehensive picture of an organization's external exposure.

Single data source. Shodan indexes what it can reach by scanning IPs. It does not pull subdomain data from Certificate Transparency logs, does not aggregate passive DNS records, does not grade SSL/TLS certificates against current standards, and does not enrich results with WHOIS ownership data. Each of those dimensions requires a separate data source.

Raw data, not analyst-ready output. Shodan returns structured JSON about what it found. What it does not produce is a composite risk score that weighs open ports, expired certificates, misconfigured DNS, and CVE exposure into a single prioritized signal. Turning raw Shodan output into an actionable risk assessment requires additional processing on your side.

No built-in DNS record analysis or email security checks. SPF, DMARC, DKIM, MX routing, NS delegation — none of this is in Shodan's scope. For vulnerability scanning workflows that include email infrastructure and DNS hygiene, you are making separate API calls.

API rate limits on lower tiers. The Small Business plan at $59/month includes query credits that can be consumed quickly in automated workflows. Continuous scanning across even a modest client portfolio will push against those limits.

Multi-Source Alternative: DFIR Platform Exposure Scanner

DFIR Platform's Exposure Scanner was built to address the multi-source problem directly. Instead of querying a single provider, it aggregates data from eleven sources in a single API call:

The output is not a raw dump from each source. The platform computes a unified risk score from 0 to 100, aggregating signal across all providers into a single prioritized assessment. A domain scan returns open ports, discovered subdomains, SSL grade, DNS records, WHOIS data, BGP information, and CVE exposure — in one response.

Pricing: The Professional plan is $79/month, which includes 2,500 credits/month. Each Exposure Scanner call costs 10 credits, giving you up to 250 full domain scans per month. New accounts receive 100 free credits per month, and there is a free public scan at dfir-lab.ch/exposure-scanner that requires no account. Use code LAUNCH50 for 50% off your first paid month.

If you prefer CLI workflows, the scanner is available via:

1dfir-cli exposure scan <domain>

Full API documentation is at platform.dfir-lab.ch/docs/exposure.

Cost Comparison

This is where the aggregation model has a direct financial case.

Shodan alone at $59/month is a reasonable tool for a specific use case. But once you start adding SecurityTrails for subdomain enumeration and passive DNS, the economics shift dramatically. SecurityTrails' API access starts at $499/month — a figure that is publicly documented and reflects the depth of their dataset. Criminal IP's Lite tier adds another $95/month.

At $79/month, DFIR Platform Professional does not just match the coverage of those three tools — it exceeds it, because all eleven providers are already integrated, and the output is normalized into a unified risk score rather than three separate JSON schemas you need to reconcile yourself.

When to Use Shodan

Shodan remains the better choice in specific scenarios:

• Deep internet-wide research. If you need to enumerate every host running a specific service across the entire internet, Shodan's dataset depth and query language are unmatched.
• IoT and OT device hunting. Shodan's indexing of industrial protocols (Modbus, BACnet, ICS) and specific device fingerprints is a specialized capability with no direct equivalent.
• Historical data investigation. When you need to understand what an IP was running six months ago, Shodan's historical snapshots are valuable.
• Specific IP or port queries. For targeted, ad-hoc lookups on known IPs, Shodan's interface is fast and familiar.
• Individual researchers on a budget. The $49 one-time Membership or $59/month API is straightforward value for researchers who do not need multi-source aggregation.

When to Use DFIR Platform Exposure Scanner

DFIR Platform is the stronger fit when:

• Domain-focused ASM. You are building or maintaining a picture of an organization's external attack surface by domain, not by IP range.
• Multi-source aggregation matters. You need subdomains, open ports, SSL grades, WHOIS data, DNS records, and threat intelligence in one place, not spread across separate tools.
• Composite risk scoring is required. Your workflow needs a prioritized, actionable output — not raw data that requires post-processing.
• MSSP multi-client scanning. Managing exposure scanning across multiple clients benefits from a single normalized API with predictable per-scan credit costs.
• Compliance monitoring. Continuous scanning with consistent output schema makes it easier to track changes over time and demonstrate due diligence.
• Teams that value integration simplicity. One API key, one schema, one risk score — versus managing credentials and response normalization for a dozen providers.

Using Both Together

There is no reason to treat this as an either/or decision. Shodan and DFIR Platform are complementary tools that serve different workflows.

A practical approach: use DFIR Platform's Exposure Scanner for continuous domain monitoring across your client portfolio. When a scan surfaces an anomaly — an unexpected open port, a CVE on an exposed service — pivot to Shodan directly to explore the broader context: how widespread is this exposure? What other hosts are running this configuration? When did this service first appear?

DFIR Platform tells you what is exposed on your monitored domains. Shodan helps you understand what that means in the context of the wider internet. Used together, they cover more ground than either covers alone.

Scan a domain you own against 11 exposure providers. The DFIR API Playground runs the Exposure Scanner in your browser and returns subdomains, open ports, CVE hits, and a composite risk score as structured JSON — 10 free calls per week, no signup. Drop in a domain and see whether a monitoring-focused scan beats ad-hoc Shodan queries for your use case.

Conclusion

Shodan is a genuinely excellent tool. Its pricing is fair, its dataset is deep, and its community is active. If your primary workflow is internet-wide research, IoT discovery, or historical IP investigation, it belongs in your toolkit.

For teams running attack surface management workflows — especially those managing multiple domains or clients — the single-source limitation becomes a real operational constraint. Aggregating Shodan, SecurityTrails, Criminal IP, SSL Labs, Certificate Transparency, and passive DNS individually costs over $650/month and requires maintaining multiple API integrations.

DFIR Platform's Exposure Scanner aggregates eleven providers, including Shodan, into a single call with a unified risk score. At $79/month for the Professional plan, the cost case for multi-source aggregation is straightforward.

You can run a free scan at dfir-lab.ch/exposure-scanner with no account required, or review the full API documentation at platform.dfir-lab.ch/docs/exposure. New paid accounts can use code LAUNCH50 for 50% off the first month.

Related reading: Attack Surface Management · Certificate Transparency · Passive DNS · SSL/TLS Certificates · Open Ports · WHOIS Lookup · Vulnerability Scanning