We couldn't read an SSL certificate for it when we last analysed it.
What security vendors and the WOT community say about this domain.
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What loads and tracks visitors when the homepage opens.
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We couldn't read an SSL certificate on port 443 when we last analysed 21cs.org. Refresh the analysis to check again.
95 similar domains registered in the last 90 days — possible typosquatting or phishing.
| Domain | Why it’s similar | Registered | Status | Report |
|---|---|---|---|---|
| 21cd.top | Typo | 12 Oct 2026 | Checking… | Report → |
| 21ds.top | Typo | 6 Oct 2026 | Checking… | Report → |
| 21ca.cn | Typo | 19 Sept 2026 | Checking… | Report → |
| 21fs.cn | Typo | 19 Sept 2026 | Checking… | Report → |
| 1cs.org | Typo | 25 Aug 2026 | Checking… | Report → |
From CubDomain's daily newly registered domains. Similar doesn't mean malicious.
Is 21cs.org’s name taken on other extensions?
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Four timed TCP connections to port 443 from CubDomain's servers.
CubDomain is not affiliated with 21cs.org. Data is collected independently from public sources and some figures are estimates, provided for information only.
Spam and malware blocklists for the site's IP and mail servers.
When the site first appeared, and what has changed since.
We record what changes from the next time this report is refreshed.
Found in public certificate transparency logs.
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