The SecurityTrails alternative for DNS, WHOIS and host intelligence
DNS and WHOIS history plus subdomain discovery - and live host/service, TLS certificate and perceptual favicon search - together in one engine.
Profundis is a unified internet-intelligence search engine. Like SecurityTrails, it provides historical DNS data, WHOIS records and subdomain discovery for mapping domains and infrastructure over time.
On top of that, Profundis adds live host and service discovery, TLS certificate search, virtual hosts and perceptual favicon similarity - all under one field:value syntax - plus an official MCP server for AI-agent access.
Why Profundis
01A unified internet-intelligence engine - exposed hosts and services, DNS (live + historical/passive), WHOIS (with reverse/registrant lookups), TLS certificates and virtual hosts - all searchable in one place with a field:value syntax (wildcards, AND/OR/NOT).
02A full OSINT tools suite: typosquatting scanner, subdomain enumeration, registrant explorer (reverse-WHOIS corporate recon), analytics-ID lookup, domain portfolio analyzer, entity-intelligence flow graph, ASN details and reverse-IP.
03Favicon perceptual-similarity search (MMH3 + visual similarity) that finds visually similar favicons, not just exact icon-hash matches - Profundis’s signature differentiator.
04An official MCP (Model Context Protocol) server, so AI agents like Claude can call Profundis search as native tools - AI-agent-native distribution.
05A free tier with an anonymous hosts and DNS preview, plus individual Solo and Professional plans. Teams and Business add shared organization workspaces and credits.
Profundis vs SecurityTrails
| Capability | Profundis | SecurityTrails |
|---|---|---|
| Historical DNS data | ✓ Live + historical/passive | Core feature |
| WHOIS records + history | ✓ Built in | Core feature |
| Subdomain discovery | ✓ Dedicated tool | Core feature |
| Live host & service discovery | ✓ Built in | Specializes in DNS/WHOIS |
| TLS certificate search | ✓ Built in | Varies by plan |
| Field:value query syntax (wildcards, AND/OR/NOT) | ✓ Across all datasets | Supported |
| Favicon perceptual similarity | ✓ Visual similarity | Check current documentation |
| Official MCP server for AI agents | ✓ Native tools | Check current documentation |
| Free tier with no-signup host/DNS preview | ✓ No signup to preview | Varies by plan |
| OSINT tools suite (typosquat, registrant, analytics-ID…) | ✓ Included | Varies by plan |
Capabilities and access conditions can change. Consult the linked publisher documentation where provided; an unverified feature is not an absent feature. Check the current plans before choosing SecurityTrails.
Frequently asked questions
Is Profundis a free SecurityTrails alternative?
Profundis offers a free tier and lets you preview hosts and DNS results without signing up. DNS/WHOIS history, subdomain enumeration and the API are available with transparent credit-based plans.
How does Profundis compare to SecurityTrails for DNS and WHOIS history?
Profundis stores live and historical DNS, indexes WHOIS records with reverse/registrant lookups, and offers subdomain discovery. It then unifies these with live host/service data, TLS certificates and favicon similarity so you can pivot across datasets in one query.
Can Profundis enumerate subdomains?
Yes. Profundis includes a dedicated subdomain enumeration tool that combines multiple data sources, alongside DNS history and certificate data for comprehensive discovery.
Does Profundis have an API and an MCP server?
Yes. Profundis provides an API and an official MCP server, so automation pipelines and AI agents like Claude can query the same datasets.
Does Profundis do reverse WHOIS / registrant search?
Yes. The Registrant Explorer performs reverse-WHOIS to find domains tied to an organization, then cross-references hosts and DNS for corporate-recon style discovery.
Compare with other tools
Comparison based on publicly available information. All trademarks are the property of their respective owners. Profundis is not affiliated with SecurityTrails.