Your DNS leaks your vendor list.
Enter any domain to see what its public footprint gives away: the SaaS it verified, every service allowed to send its email, and who runs its mail, DNS and hosting. Each finding shows the record it came from.
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Public DNS anyone can look up, plus one homepage request. No logins, no JavaScript.
TXT verification
SaaS that verified the domain: Atlassian, Notion, OpenAI, Stripe…
SPF
every service allowed to send email as the company
MX
who runs the company's email
CNAME / NS
who hosts the site and runs its DNS
DMARC
the email-security tool reading its reports
IP owner
the cloud or CDN behind the site
Subdomains
status., trust., auth., docs. vendors, from certificate logs
Homepage
headers, scripts, meta tags and cookie names from one request
Findings · YC W24 – F26
48%
of 1,828 recent YC startups host on Vercel.
Read the report →