2026 review

SecurityTrails review

DNS & domain intelligence for security research

Quick facts

Category: DNS and infrastructure APIs, WHOIS and RDAP APIs, Threat and vulnerability intelligence APIs
Website: securitytrails.com
Pricing starts at: Contact sales
Free tier: No current public free-tier terms
How usage is billed: Credits, pages, requests, records, compute units, subscriptions, and browser-time blocks are not interchangeable.
Enterprise plan: Custom pricing

What SecurityTrails is

SecurityTrails provides DNS intelligence, passive DNS data, subdomain enumeration, and WHOIS history for security researchers and threat intelligence teams.

Compared in: DNS and infrastructure APIs, WHOIS and RDAP APIs, Threat and vulnerability intelligence APIs.

Strengths

Passive DNS history
Subdomain enumeration for recon
Historical WHOIS and DNS data

Limitations

Pricing requires contacting sales
No published free tier
Security-focused, not for domain registration

Pricing summary

Figures come from published SecurityTrails sources checked on 2026-07-29, linked under Sources. Plans and limits change, so confirm them with the vendor before you buy.

Plan	SecurityTrails	DomScan
Free tier	No current public free-tier terms	Free: 10,000 credits/month
Entry paid plan	Contact sales	Pay-as-you-go from $10
Enterprise	Custom pricing	Custom pricing

Credits, pages, requests, records, compute units, subscriptions, and browser-time blocks are not interchangeable.

See the full SecurityTrails pricing breakdown

Who SecurityTrails suits

Good fit

Stay with SecurityTrails if passive DNS history, subdomain enumeration, and historical WHOIS drive your security research.

Weaker fit

You need availability checks, not only security data
You want published pricing for small projects
You want valuation to size up names you discover
You need an MCP server for AI-agent workflows

SecurityTrails vs DomScan

Feature availability for SecurityTrails comes from its published product documentation. DomScan credit costs come from its published endpoint pricing.

Feature	SecurityTrails	DomScan
Free tier	−	✓ 10,000/month
Domain availability	✓	✓
WHOIS data	✓	✓
DNS lookup	✓	✓
Domain valuation	−	✓
Brand monitoring	Limited	✓
MCP/AI integration	−	✓
Bulk operations	✓	✓

DomScan products for the same jobs

These DomScan products cover the categories where SecurityTrails competes. Each shows its published credit cost per request.

DNS Lookup Perform DNS lookups for any record type. Credits per request: 1 Subdomain Finder Discover subdomains for a domain using various enumeration techniques. Credits per request: 4 to 5 WHOIS Lookup Get WHOIS information for a domain including registrar, dates, and status. Credits per request: 3 RDAP Lookup Instant RDAP lookup for domains. Pull registrar, status, and expiry data in seconds. Credits per request: 2

Verdict

Main strength of SecurityTrails: Passive DNS history. Main trade-off: Pricing requires contacting sales. If you need several kinds of domain, DNS or web data from one API key, DomScan publishes the credit cost of every endpoint and includes 10,000 free credits each month.

Compare with DomScan → Visit SecurityTrails

Frequently asked questions

What is SecurityTrails?

SecurityTrails provides DNS intelligence, passive DNS data, subdomain enumeration, and WHOIS history for security researchers and threat intelligence teams.

How much does SecurityTrails cost?

Published pricing checked on 2026-07-29. Free tier: No current public free-tier terms. Entry paid plan: Contact sales. Enterprise: Custom pricing.

When is SecurityTrails the better choice?

Stay with SecurityTrails if passive DNS history, subdomain enumeration, and historical WHOIS drive your security research.

How does SecurityTrails pricing compare with DomScan?

SecurityTrails and DomScan count usage in different units, so there is no exact per-request comparison. DomScan includes 10,000 free credits every month and publishes the credit cost of every endpoint, so you can price the operations you plan to run.