Is cidr.xyz safe?
http://cidr.xyz/
Checked on
How we checked
Coverage: strong · 3 of 4 applicable core capabilities
- Antivirus (58 of 91 engines answered) · saved result: did not fully complete
- Google Safe Browsing: completed
- page reading: completed
- page capture: completed
- domain records: completed
- web research: completed
CIDR.xyz is a long-running free subnet calculator with no detected threats or commercial traps
CIDR.xyz is a free, browser-based utility that calculates and visualises IPv4 CIDR subnets and IP ranges. The site has been registered for nearly eleven years, presents a valid encrypted connection, and returned no threat warnings in security checks. Its own pages describe a simple paste-and-see tool, and the only outbound links are to the developer's GitHub, related utility projects, and a Google browser add-on. No commercial funnel, checkout, or affiliate mechanism was found. The score reflects a clean technical profile and a transparent, non-commercial operator identity.
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Preparing the saved page preview.
Where this site sits
- Dangerous1–20
- High Risk21–44
- Moderate Risk45–69
- Low Risk70–84
- Safe85–100
The score combines saved evidence strength and analysis quality. Coverage is reported separately.
Why 92/100
Safe covers scores 85–100. No adverse finding was saved; 3 pushed it up.
What pulled the score down
No adverse finding was saved with this report.
What pushed the score up
- SupportsThe registrable domain is 3971 days old, indicating a long-established presence inconsistent with disposable scam infrastructure.
- SupportsThe browser threat feed returned no threat warning, the TLS check found a valid encrypted connection, and the hosting IP has an abuse confidence score of 0/100.
- SupportsThe site discloses its creator and operator and provides a contact address, with source code available on GitHub.
Community reviews never change the Safety Score.
01 · Investigation Brief
Investigation Brief
CIDR.xyz is a free, browser-based utility that calculates and visualises IPv4 CIDR subnets and IP ranges. The site has been registered for nearly eleven years, presents a valid encrypted connection, and returned no threat warnings in security checks. Its own pages describe a simple paste-and-see tool, and the only outbound links are to the developer's GitHub, related utility projects, and a Google browser add-on. No commercial funnel, checkout, or affiliate mechanism was found. The score reflects a clean technical profile and a transparent, non-commercial operator identity.
A free networking utility, not a storefront
The site describes itself as a modern CIDR calculator and subnet visualisation tool. Its main function is stated plainly: paste any IP or CIDR and it instantly shows the netmask, broadcast address, usable host range, and a visual bit map. There is no product catalogue, no pricing, no account creation, and no checkout flow in the reviewed content.
The operator is disclosed on the page. The site credits Yuval Adam as the creator and Magic Monad as the operator, and the privacy policy provides a contact address at hello@magicmonad.com. Independent research also points to the project's source code on GitHub, which is consistent with a transparent developer-run utility.
Clean technical checks and no commercial risk mechanics
The saved security checks found no threat warning from the browser threat feed, a valid encrypted connection, and a hosting IP with an abuse confidence score of zero out of one hundred across one saved report. These are absence-of-detection results rather than a guarantee of safety, but they are consistent with a benign utility site.
The domain is 3971 days old, which is roughly eleven years of continuous registration. That long history is a supportive signal because it is inconsistent with the short-lived throwaway domains typical of scam operations. No confirmed risk mechanics, affiliate relationships, or customer-risk evidence were identified in our review.
The privacy policy states that the site does not collect personally identifiable information and does not ask for or store names, email addresses, phone numbers, or other personal details. It also states that Google Analytics is used for anonymous traffic understanding and that IP addresses are anonymised. This is a normal, low-risk analytics disclosure for a free tool.
Outbound links are informational, not commercial funnels
The page links out to GitHub, Markdown.page, Namekit.app, Eternitybits.com, and a Google browser add-on. These destinations are related developer tools and resources rather than sales pages, affiliate offers, or cross-domain order paths. None of the links carries an explicit monetisation or commercial intent in the reviewed evidence.
Why the score is 92
The saved checks and analysis found no material threat. Coverage remains separate so missing sources cannot be mistaken for clean results.
02 · Security Evidence
Security evidence
Antivirus Engines
0/ 91
No detectionsSaved analysis from September 5, 2026 - stale
No detections across 58 engines that rated this URL
No antivirus engine that answered raised an adverse result; 33 had no rating for this URL. This is one signal, not a guarantee.
- Malicious
- 0
- Suspicious
- 0
- Total
- 91
All 91 engine results
- 0xSI_f33d - Unrated
- Abusix - Clean
- Acronis - Clean
- ADMINUSLabs - Clean
- AILabs (MONITORAPP) - Clean
- AlienVault - Clean
- alphaMountain.ai - Clean
- AlphaSOC - Unrated
- Antiy-AVL - Clean
- ArcSight Threat Intelligence - Unrated
- AutoShun - Unrated
- Bfore.Ai PreCrime - Unrated
- BitDefender - Clean
- Bkav - Unrated
- BlockList - Clean
- Blueliv - Clean
- Certego - Clean
- ChainPatrol - Unrated
- Chong Lua Dao - Clean
- CINS Army - Clean
- CRDF - Clean
- Criminal IP - Unrated
- CSIS Security Group - Unrated
- CTX AI - Clean
- Cyan - Unrated
- Cyble - Clean
- CyRadar - Clean
- desenmascara.me - Clean
- DNS8 - Unrated
- Dr.Web - Clean
- EmergingThreats - Clean
- Emsisoft - Clean
- Ermes - Unrated
- ESET - Clean
- ESTsecurity - Clean
- Forcepoint ThreatSeeker - Clean
- Fortinet - Clean
- Fortra - Unrated
- G-Data - Clean
- GCP Abuse Intelligence - Unrated
- Google Safe Browsing - Clean
- GreenSnow - Clean
- GreyNoise - Unrated
- Gridinsoft - Unrated
- Guardpot - Unrated
- Heimdal Security - Clean
- Hunt.io Intelligence - Unrated
- IPsum - Clean
- Juniper Networks - Clean
- K7AntiVirus - Unrated
- Kaspersky - Clean
- LevelBlue - Unrated
- Lionic - Clean
- Lumu - Unrated
- Malwared - Clean
- MalwarePatrol - Clean
- MalwareURL - Unrated
- Mimecast - Unrated
- Netcraft - Unrated
- OpenPhish - Clean
- PhishFort - Unrated
- Phishing Database - Clean
- Phishtank - Clean
- PREBYTES - Clean
- PrecisionSec - Unrated
- Quick Heal - Clean
- Quttera - Clean
- Rising - Clean
- SafeToOpen - Unrated
- Sangfor - Clean
- Sansec eComscan - Unrated
- Scantitan - Clean
- SCUMWARE.org - Clean
- Seclookup - Clean
- Snort IP sample list - Unrated
- SOCRadar - Unrated
- Sophos - Clean
- StopForumSpam - Clean
- Sucuri SiteCheck - Clean
- ThreatHive - Clean
- URLhaus - Clean
- URLQuery - Unrated
- Viettel Threat Intelligence - Clean
- VIPRE - Unrated
- ViriBack - Clean
- VX Vault - Clean
- Webroot - Clean
- Xcitium Verdict Cloud - Clean
- Yandex Safebrowsing - Clean
- ZeroCERT - Clean
- ZeroFox - Unrated
How security vendors categorise this site
- alphaMountain.aiInformation Technology
- BitDefendermisc
- Forcepoint ThreatSeekerreference materials
- Googletechnology
Each vendor’s own label for the site, saved with the antivirus result. Labels are separate from the engine verdicts above and can disagree with each other.
Security Scans
Checked against the browser threat feeds available to this scan — no hit.
What we observed
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Visual context from the captured page
CIDR Calculator
What the captured page showed
1 observation- 01
CIDR Calculator
What the page says about itself
What the site says about itself, quoted from the pages we read. The site wrote these words; they are not our findings.
- Page title
Interactive visual CIDR and IP range calculator
- Meta description
Instantly compute and visualize CIDR subnets, IP ranges and masks. Free online tool for accurate network design, planning and IT education.
Pages we read
- Main page/Read
- Privacy policy/privacy-policy/Read
03 · Investigation Story
Investigation story
What the site claims
Interactive visual CIDR and IP range calculator
What we observed
The page content was captured and checked alongside 58 antivirus results.
What independent research found
1 external finding was saved and compared with the page evidence.
What remains unverified
1 of the 4 applicable core capabilities did not complete, so those gaps remain visible in the coverage ledger.
What kind of site and risk is this?
Threat category
No threat category confirmed
Service and business model
Content
Observed behavior
Evidence behind this classification
- 01The registrable domain is 3971 days old, indicating a long-established presence inconsistent with disposable scam infrastructure.
- 02The browser threat feed returned no threat warning, the TLS check found a valid encrypted connection, and the hosting IP has an abuse confidence score of 0/100.
- 03The site discloses its creator and operator and provides a contact address, with source code available on GitHub.
Web research findings
Independent findings for cidr.xyz, including public complaints, named review sources, registration records, and look-alike-domain evidence. A missing result is shown as unverified, never converted into a clean bill of health.
No independently sourced scam reports or credibility records were found for cidr.xyz. That is common for new or low-traffic sites and does not clear the site.
Reputation Sources
How this domain rates across independent threat-intelligence and blocklist providers.
04 · Domain & Infrastructure
Domain & infrastructure
The plumbing behind the site — who registered it, how it’s encrypted, where it’s hosted, and where it links out. A valid certificate or a calm server doesn’t mean the business is honest — scam sites pass these checks too. Use this to corroborate the verdict, not to overturn it.
Infrastructure map
How the saved page connected to the wider web.
- Domaincidr.xyz
- Redirects tocidr.xyz
- Hosted byCloudflare, Inc.
- Referencestrack.magicmonad.com · googletagmanager.com
Domain Timeline
- Dec 7, 2015Domain registered
First appeared in WHOIS records — 10 years old when this review was saved.
- Oct 22, 2026Saved security review — Rated Safe
This saved scan found no active threat signals in the checks it completed.
cidr.xyz has operated for years with no threat signals in this review — a long, stable track record, though it is never a guarantee on its own.
Contact Verification
Saved contact details can help identify the operator. Their presence supports traceability; it does not prove the business is trustworthy.
- Links to 2 social profiles.
Domain & Encryption
Cloudflare DNS is used by legitimate and scam sites alike, so it does not identify who runs the site.
Certificate issued for cidr.xyz.
A shared Cloudflare address answers for many sites, so it is not the site's own server and says nothing about who runs it.
Analytics and ads
- Google Tag Manager
- Cloudflare Web Analytics
Payment providers the page loads
None seen among the outside domains we saved.
Read from the first 20 outside domains the page loads and the shop platform it uses; the web server and platform rows are under Hosting & Technology. A payment script on the page does not prove the shop accepts that method at checkout, or that you are protected.
Server Reputation
Referenced Domains
Outbound domains this page links to or loads resources from. Each links to its own security scan.
05 · Evidence Ledger
Evidence ledger
- Antiviruspartial
- Browser threat feedcomplete
- Page contentcomplete
- Analysiscomplete
- Visual evidencecomplete
The conclusion is supported by the evidence saved with this report.
Technical threat
unknownMalware, phishing, credential theft and hostile infrastructure.
No confirmed evidence in this dimension.
Operator / customer risk
unknownComplaints, withdrawals, business conduct and commercial traps.
No confirmed evidence in this dimension.
Source coverage and freshness
Status shows whether usable evidence was saved; finding shows what that evidence observed.
| Source | Result | Completion | Finding | Freshness |
|---|---|---|---|---|
| Antivirus | 0 of 91 engines flagged | Limited | No saved finding | stale fallback · analysed Sep 5, 2026 |
| Browser protection | No browser threat-list match | Completed | No adverse finding | this scan · Oct 22, 2026 |
| Page content | Page fetched · HTTP 200 | Completed | No adverse finding | this scan · Oct 22, 2026 |
| Visual evidence | 1 visible observation saved with the page capture | Completed | No adverse finding | this scan · Oct 22, 2026 |
| Independent research | 1 independent finding was saved | Completed | No adverse finding | this scan · Oct 22, 2026 |
- Antivirus
- Result0 of 91 engines flagged
- CompletionLimitedFindingNo saved finding
- Freshnessstale fallback · analysed Sep 5, 2026
- Browser protection
- ResultNo browser threat-list match
- CompletionCompletedFindingNo adverse finding
- Freshnessthis scan · Oct 22, 2026
- Page content
- ResultPage fetched · HTTP 200
- CompletionCompletedFindingNo adverse finding
- Freshnessthis scan · Oct 22, 2026
- Visual evidence
- Result1 visible observation saved with the page capture
- CompletionCompletedFindingNo adverse finding
- Freshnessthis scan · Oct 22, 2026
- Independent research
- Result1 independent finding was saved
- CompletionCompletedFindingNo adverse finding
- Freshnessthis scan · Oct 22, 2026
07 · Safety FAQ
Safety FAQ
Common questions, answered directly from the scan data above — so the answers reflect the saved verdict and evidence in this report.
Is cidr.xyz legit and safe?
Is cidr.xyz safe to use?
Could a legitimate site like cidr.xyz still be used in a scam?
Has cidr.xyz been flagged by antivirus engines?
Is cidr.xyz on any phishing or malware blacklists?
How old is the cidr.xyz domain?
Does cidr.xyz have a valid SSL certificate?
Where is cidr.xyz hosted?
How often is the cidr.xyz report updated?
08 · Final Verdict
Final verdict
CIDR.xyz is a long-running free subnet calculator with no detected threats or commercial traps
CIDR.xyz is a free, browser-based utility that calculates and visualises IPv4 CIDR subnets and IP ranges. The site has been registered for nearly eleven years, presents a valid encrypted connection, and returned no threat warnings in security checks. Its own pages describe a simple paste-and-see tool, and the only outbound links are to the developer's GitHub, related utility projects, and a Google browser add-on. No commercial funnel, checkout, or affiliate mechanism was found. The score reflects a clean technical profile and a transparent, non-commercial operator identity.
09 · Community
Community
Are you the owner of cidr.xyz?Verify and reply