mathcn.com

Mathcn.com

设有小学数学教学课件交流，精彩题库，奥数专栏等栏目。

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Authority

7/100

Safety

90/100

Registered

Apr 1, 2018

8 years old · Alibaba Cloud Computing Ltd. d/b/a HiChina (www.net.cn)

4 of 5 safety checks passed (Sep 8, 2026).

AboutUs has not vetted this site. 1 of 5 automated safety check 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

What AboutUs observed on the live site and in WHOIS/DNS today. These are measurements, not an endorsement of the site.

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Domain registered Apr 1, 2018 — 8 years old.

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Registrar today: Alibaba Cloud Computing Ltd. d/b/a HiChina (www.net.cn) — unchanged since AboutUs began tracking (Aug 29, 2026).

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Live site responds over HTTPS.

Trust record

Authority & Safety, with the evidence

How this is scored →

Authority 7/100 — ahead of 7% of scored sitesClear

Why this authority score

Prominence (Open PageRank 0.0/10)+2
Verified continuity: 8.3 years (RDAP registration)+7
Security & email hygiene+3
Calibration adjustment (published map)+1

Every point maps to a sentence. These lines sum to the model score of 13/99, which is what places this site at 7/100 against every other scored site.

Safety evidence

No MX and no DMARC (mild)

Site history

Dated record — historical facts always carry their date.

2018
Domain registered (Apr 1, 2018).
2026
Checked today — 4 of 5 safety checks passed (Sep 8, 2026).

✓ domain continuity 8 years registered✓ live verified Sep 8, 2026

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