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Lookup versus SecurityTrails
Compare	Lookup	SecurityTrails
Verdict	Depends	Depends
Best for	Pre-purchase domain checks	Bug bounty hunters
Who it's not for	Teams needing bulk or automated domain lookups	Casual users needing occasional domain lookups
Privacy	No known public vulnerabilities found in the sources reviewed.^²	No known public vulnerabilities found in the sources reviewed.
Support quality	No support evidence found.	No usable evidence in sources
Public sentiment	Sources contain no reviews of ICANN Lookup itself; listed reviews describe unrelated lookup products.^³	OSINT researchers and bug bounty hunters consistently recommend SecurityTrails, while some Reddit users point to free alternatives over the paid tiers.¹⁶
Biggest gotcha	Guess: Heavy use hits rate limits; automation needs the separate RDAP protocol, not this site.^¹	Enterprise pricing is negotiate-with-sales; no list prices anywhere¹¹

Pick Lookup when

Pre-purchase domain checks
Verifying a site's registrar and owner
Phishing and spam domain triage
One-off lookups by IT or legal

When Lookup is not a fit

Teams needing bulk or automated domain lookups
Developers wanting a supported API with SLAs
Buyers of phone, email, or people search tools (different products)
Anyone expecting vendor support or a contract

Pick SecurityTrails when

Bug bounty hunters
OSINT researchers
Attack surface mapping teams
Threat intel API integrations

When SecurityTrails is not a fit

Casual users needing occasional domain lookups
Buyers wanting transparent published pricing
Small teams without engineering or API skills
One-time recon tasks . free tools may suffice

Sources

Lookup, ICANNlookup.icann.org
official
Product security pagelookup.icann.org
official
Read Customer Service Reviews of reverselookup.comuk.trustpilot.com
review
Lookup, Crunchbase Company Profile & Fundingcrunchbase.com
official
Recorded Future Acquires SecurityTrails in $65M Dealsecurityweek.com
news
Recorded Future acquires SecurityTrailstechcrunch.com
news
SecurityTrails Reviews on G2 (seller)g2.com
review
Which paid cybersecurity tools are ridiculously overpricedreddit.com
review
HackerOne $1M bounty AMA mentioning SecurityTrailsreddit.com
review
Top 5 OSINT Sources for Penetration Testing and Bug Bountiesintel471.com
review
SecurityTrails Enterprise API Pricingsecuritytrails.com
official
SecurityTrails V2 API . List Exposuresdocs.securitytrails.com
official
SecurityTrails, a Recorded Future Company . LinkedInlinkedin.com
official
Recorded Future Support . SecurityTrailssupport.recordedfuture.com
official
SecurityTrails Pricing & Plans . Vendrvendr.com
review
SecurityTrails Review . OSINT4ALLosint4all.com
review