Who.is
Worth it
Confidence: Low
Reviewed sources were mostly irrelevant (Doctor Who and World Health Organization content), so confidence is low and this leans on general category knowledge.
Comparison
Who.is vs SecurityTrails
Who.is lands on Worth it, and SecurityTrails lands on Depends.
SecurityTrails
Depends
Confidence: Medium
Buy if you do security research, bug bounty, or attack surface mapping and will actually use the API weekly.
| Compare | Who.is | SecurityTrails |
|---|---|---|
| Verdict | Worth it | Depends |
| Best for | Buyers checking domain availability | Bug bounty hunters |
| Who it's not for | Bulk domain portfolio monitoring | Casual users needing occasional domain lookups |
| Privacy | No known public vulnerabilities found in the sources reviewed.¹ | No known public vulnerabilities found in the sources reviewed. |
| Support quality | No usable evidence in reviewed sources | No usable evidence in sources |
| Public sentiment | No credible user reviews of surfaced; search results returned unrelated Doctor Who and World Health Organization content. | OSINT researchers and bug bounty hunters consistently recommend SecurityTrails, while some Reddit users point to free alternatives over the paid tiers.13 |
Pick Who.is when
- Buyers checking domain availability
- Quick WHOIS/DNS/IP lookups
- Developers debugging DNS records
When Who.is is not a fit
- Bulk domain portfolio monitoring
- Threat-intel teams needing enriched or historical WHOIS
- Enterprises needing SLA-backed API contracts
- Compliance workflows needing audited data provenance
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
- Product security pagewho.isofficial
- Recorded Future Acquires SecurityTrails in $65M Dealsecurityweek.comnews
- Recorded Future acquires SecurityTrailstechcrunch.comnews
review
review
review
- SecurityTrails Enterprise API Pricingsecuritytrails.comofficial
- SecurityTrails V2 API . List Exposuresdocs.securitytrails.comofficial
official
- Recorded Future Support . SecurityTrailssupport.recordedfuture.comofficial
review
- SecurityTrails Review . OSINT4ALLosint4all.comreview
- isMalicious vs SecurityTrailsismalicious.comreview
- DomainTools vs SecurityTrails . SourceForgesourceforge.netreview
- WhoisJSON API Alternative Blogwhoisjson.comreview