Website report snapshot
linux operating system software training at linux21cn.com
Report summary
Resolve high-priority trust, verification, or visibility issues before treating this profile as launch-ready.
Report score
62/100
Owner action needed
Launch state
Search eligible
Eligible for launch indexing
Owner status
Claimable
No owner has verified domain control for this profile yet. Crawler and archive evidence remain visible, and official facts should be submitted through review.
Search visibility
Indexable public profile
This crawler-backed profile passed the public publication gate.
Can I trust this site?
Sourced website trust answerThis is still a useful free report, but the 62/100 score should route owners to the blocking action before checkout or launch visibility.
Facts, not verdicts. AboutUs shows sourced signals and the next owner action; it is not a scam label.
Evidence basis
Authority not scored yet · Some caution flags
Source freshness: 70 days old
Trust signals
2 need attention
Live website checks are useful, but at least one public trust signal needs follow-up before stronger promotion.
Freshness
70 days old
Watch live trust signals
Ownership
Unclaimed
Submit the owner request and prove control with a DNS TXT record for this domain.
Next step
Claim this profile
Submit the owner request and prove control with a DNS TXT record for this domain.
Authority and safety snapshot
This report is useful as a current website snapshot, but the signal model shows where confidence is limited before visitors, owners, or paid tools rely on it.
Evidence used now
Score source
Refreshed profile columnsAboutUs is using stored authority refresh output for this report.
Score basis
High-priority action cap
High-priority findings below are holding this score down. Resolving them raises it.
Current public signals checked for this report.
No A/AAAA record
No public A/AAAA record was found for this domain.
Source: AboutUs public DNS lookup
Not reachable
No public A/AAAA record was found for this domain.
Source: AboutUs live HTTPS response
No breaches on record
Have I Been Pwned has no catalogued breaches for this domain. Absence of a record is not a guarantee that no breach occurred.
Source: Have I Been Pwned
What should improve before this profile becomes a stronger launch or owner asset.
Claim and verify this profile to turn public crawler data into an owner-confirmed trust record.
Verify ownership
The website owner needs to prove domain control with DNS before AboutUs treats owner facts as official.
Unlocks: Owner-controlled edits, verified status, stronger launch confidence, and paid owner setup.
Start owner claimNo public A/AAAA record was found for this domain.
Fix owner-side trust issue
The owner or site operator likely needs to fix the live website signal; AboutUs can recheck and record recovery.
What the correction form will prefill
Finding: DNS
Official and evidence URL start as https://linux21cn.com; owners can replace the evidence URL with a deeper source page.
The review note includes this finding plus the ranked report context.
Unlocks: Removes a high-priority report blocker and makes claim follow-up or checkout safer.
Suggest a correctionThe recommended path from public report to verified owner value.
Safety model
High confidence; Safety is 82/100 and current band is Some caution flags.
External popularity
Open PageRank 0/10Popularity evidence is attached as context, not as a guarantee of safety.
Domain age evidence
Not attachedRDAP age is not attached yet, so new-domain and maturity context is limited.
Threat-feed coverage
Not attachedThreat-feed input is missing; missing data is treated as unknown, not as a clean bill of health.
Last authority refresh
Aug 17, 2026Stored authority columns include a refresh timestamp for this profile.
Recommended authority action
Prove domain control so the site owner can improve facts and attach owner intent to this profile.
Outcome: Turns crawler-only evidence into an owner-controlled record.
Start owner claimThis is not a fraud verdict or PageRank score. It is an AboutUs signal summary based on current report-derived signals, live checks, ownership, freshness, and evidence source.
Authority includes Open PageRank data.
No public A/AAAA record was found for this domain.
Fix owner-side trust issue
The owner or site operator likely needs to fix the live website signal; AboutUs can recheck and record recovery.
What the correction form will prefill
Finding: HTTPS
Official and evidence URL start as https://linux21cn.com; owners can replace the evidence URL with a deeper source page.
The review note includes this finding plus the ranked report context.
Unlocks: Removes a high-priority report blocker and makes claim follow-up or checkout safer.
Suggest a correctionClaimed Profile
Free
Claim your page, verify ownership, and correct what it says — always free.
Best owner plan for this profile
Start with owner verification, official facts, reviewed corrections, and profile change alerts before higher-visibility spend.
Recommended plan
Claimed Profile
Score 62/100 · Search eligible
Before payment