ctssn.com

Ctssn.com

Ctssn.com hosts a free, self-paced UNIX and Linux tutorial aimed at absolute beginners, structured as a 10-lesson course designed to take learners from no experience to a working "expert" level. The site covers core topics including the command line, file permissions, and the Vi editor, and is offered entirely in English at no cost.

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Authority

—/100

Safety

90/100

Registered

Mar 9, 2001

25 years old · GoDaddy.com, LLC

2 of 4 safety checks passed (Sep 19, 2026).

AboutUs has not vetted this site. 2 of 4 automated safety checks did not pass. Everything below is what we could measure automatically. Anything you do on the site — paying, sharing personal details, downloading — is between you and the site, not AboutUs.

Current facts

Latest available measurements; dated entries retain their dates. These are measurements, not an endorsement of the site.

Authority & Safety, with the evidence

How this is scored →

Authority: not enough signals yetClear

Why we're not scoring this yet

We withhold an authority number until independent evidence (global rank, link-graph presence) has accrued. The facts we do have about this site are shown below — we'd rather say “not enough signals yet” than invent a low score.

Safety evidence

No unexpired threat-feed result; name-similarity check available (recorded about 33 days ago); 3/3 transport and email checks available (oldest recorded about 33 days ago). This is evidence coverage, not a probability that a website is safe.

Missing DMARC (mild)

Site history

Dated record — historical facts always carry their date.

2001
Domain registered (Mar 9, 2001).
2026
Checked today — 2 of 4 safety checks passed (Sep 19, 2026).

✓ domain continuity 25 years registered✓ live verified Sep 19, 2026

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