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.
What SecurityTrails is known for
SecurityTrails is widely known for DNS and WHOIS history and subdomain data.
Why Profundis
A 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).
A 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.
Favicon perceptual-similarity search (MMH3 + visual similarity) that finds visually similar favicons, not just exact icon-hash matches - Profundis’s signature differentiator.
An official MCP (Model Context Protocol) server, so AI agents like Claude can call Profundis search as native tools - AI-agent-native distribution.
A free tier with no signup required for the hosts and DNS anonymous preview, plus transparent credit-based pricing from Free to Basic, Professional and Enterprise.
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 | - |
| Official MCP server for AI agents | Native tools | - |
| 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 |
“✓” marks a Profundis capability. “-” means the capability is not a documented public feature of SecurityTrails at the time of writing - not a definitive statement about its roadmap. Based on publicly available information.
Frequently asked questions
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.
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.
Yes. Profundis includes a dedicated subdomain enumeration tool that combines multiple data sources, alongside DNS history and certificate data for comprehensive discovery.
Yes. Profundis provides an API and an official MCP server, so automation pipelines and AI agents like Claude can query the same datasets.
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.
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