Certadomain

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Check DMARC, SPF and DKIM, scan a URL for phishing, and discover subdomains — all free, no sign-up. Assess your domain's security in one place.

Developer Tools Estimated origin: Japan Added 7 Nov 2026 Analysed 7 Nov 2026 via Hacker News

Own this site?

Screenshot of Certadomain

What we found

  1. It sends four of the six security headers we check; missing are Permissions-Policy and Content-Security-Policy.
  2. The site is hosted on AWS S3 and served through AWS CloudFront, with a domain registered 4 months before launch.

Built with: 7 technologies · Scale-up stack

Each technology links to its own page: which other new sites launched with it.

Site checks

Page basicsHow we check
Custom title and meta description
Open Graph tags (title, image, description)
Twitter card meta tags
Canonical URL declared
Responsive viewport meta tag
Favicon present
Semantic HTML (nav, main, article)
Page title is 70 characters Google only shows about 60 characters of the title in search results; aim for 50–60 to keep the whole thing visible.
Crawl files
robots.txt
sitemap.xml 25 URLs
security.txt optional
llms.txt optional
ads.txt
humans.txt optional
AI crawlers No stanceHow we check
llms.txt published not published
No AI bots blocked in robots.txt
Content-Signal none declared
Link headers none advertised

Email

StateRecordStatusWhat it does
SPF -all Strict (-all) Lists the servers allowed to send email for the domain.
DMARC p=reject Reject (strict) Tells receivers what to do with email that fails SPF or DKIM.
DKIM Not found at common selectors Signs outgoing email. We check common selectors only, so a provider may use another.
MTA-STS Not deployed Stops email to the domain being downgraded to plain text in transit.
TLS-RPT Not configured Sends the owner reports of failed encrypted deliveries.

Hosting and network

Network AMAZON-02 - Amazon.com, Inc., US AS16509, US
DNS AWS Route 53 authoritative nameservers
DNSSEC Not enabled DNS answers are unsigned
Certificate Amazon valid 18 Jun 2026 to 1 Jan 2027, as captured
Domain age 4 months registered Jun 2026, Amazon Registrar, Inc.
Green hosting No record per The Green Web Foundation
Page build 3 JS files, 0 CSS files 2 third-party domains
Brand colours

Storage: 1 item

Local storage 1
KeySizeSet by
google_auto_fc_cmp_setting3 BGoogle AdSense

Performance

MeasureThis siteReading
Server response 56 ms good, faster than 93% of sites
Largest contentful paint 180 ms good
Layout shift 0.00 good
Page weight 343 KB light
Image weight 0 KB light
Third-party domains 2
Console errors 0 none
Failed requests 0 none

From a single automated render of the home page. A quick guide, not a substitute for Lighthouse or field data. How we measure

Notes

  1. Looks AI-built: few AI signals. How much the site looks AI-generated. It is a pattern match shown for interest, not a verdict.
    Which signals fired
    SignalPoints
    AI writing signals+5
  2. Performance comes from one render on 7 November 2026 and will vary between visits.

How we know

FirstSited records what new websites are built with, usually within a day of going live. Most we find ourselves, by watching public internet infrastructure for brand-new sites; the rest come from Product Hunt, Hacker News and PeerPush. We checked this one in full: its tech stack, DNS, security headers and page basics. This page is what we saw on 7 November 2026; the live site may have changed since.

Every technology below links to its own page: which other new sites launched with it. Watch any of them and get every new site that uses it as it goes live, from £15 a month.

Spot a mistake? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.