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calcudoku.org

Online Calcudoku Puzzles

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Paid content
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Profile views 10 Outbound visits 4 Normal
Online Calcudoku Puzzles Full homepage screenshot

At a glance

Category
Other
Language
English
Paid-content signal
Paid contentObserved
Registered
2011
Hosting
Akamai Connected CloudInferred
HTTPS certificate trusted
PassedObserved
Last updated

Related questions

More questions →
What is calcudoku.org?
Online Calcudoku Puzzles
Does calcudoku.org offer paid content?
Paid content or plans are available. Check the website for current prices and included features.
What languages does calcudoku.org support?
Primary language: English.
How can I visit calcudoku.org?
Use the Visit website link to open the website in a new tab.
What are some alternatives to calcudoku.org?
Unknown.

Website Overview

Identifiable technologies and additional version or configuration signals make the service easier to fingerprint, which may help targeted scanners narrow their checks. An established domain and managed infrastructure suggest continuity of operations and may support dependable delivery, although neither guarantees service quality.

Domain and Registration

Registered in 2011, this domain has about 15 years of history. That suggests continuity, although ownership and purpose may have changed. Transfer-protection status is present, helping reduce the risk of unauthorized domain transfers. The domain uses the common .org extension, which is not an independent safety signal.

DNS and Email

Nameservers are provided by dnsowl.com, indicating managed DNS hosting. MX records point to the emailowl.com email service. No CNAME was found; the observed records resolve directly to addresses. SPF and DMARC are configured. DKIM status is unknown. DNSSEC signatures were not detected, so this additional DNS authenticity protection is not confirmed.

TLS and Certificates

The certificate uses an RSA 2048-bit public key, offering broad client compatibility. The server supplied a complete certificate chain. No organization name is present in the certificate; the available fields are consistent with domain validation. The certificate was issued by Let's Encrypt, commonly associated with automated certificate services. The certificate's total validity is about 89 days, consistent with a short renewal cycle.

HTTP and Browser Security

The Server header exposes the software version: Apache/2.4.62 (Rocky Linux) OpenSSL/3.2.2. This makes version-targeted checks easier, but is not proof of an exploitable vulnerability. X-Powered-By exposes backend information: PHP/8.3.36. The response lacks these common security headers: HSTS, CSP, X-Content-Type-Options, Referrer-Policy, clickjacking protection. No obvious internal addresses or debug information were found in the headers. Cookie security attributes are unknown.

Technology Stack Analysis

The public page identifies jQuery, Google Analytics, Apache 2.4.62, PHP, with exact versions exposed for 1 technologies. These details can narrow vulnerability checks, although exposure alone is not a vulnerability.

Search and Social Sharing

No viewport meta tag was detected, which may affect mobile layout behavior. The title has 24 characters, within a common display range. A meta description is present, with 24 characters. The observed directives allow indexing and link following. No Generator meta tag is publicly exposed.

Hosting and Email
DNSdnsowl.com
HostingAkamai Connected Cloud
Emailemailowl.com
Approximate IP geolocation (inferred; a CDN or proxy may differ from the origin server) United States flagCedar Knolls, New Jersey, United States Inferred 45.79.143.40

Registration details

RDAP / WHOIS

RegistrarNameSilo, LLC
Registered2011-03-23
Expires2027-03-23
Domain statusclient transfer prohibited
Nameserversns1.dnsowl.com、ns2.dnsowl.com、ns3.dnsowl.com
DNSSECunsigned

DNS records

DNS

TypeNameValueTTLPriority
Awww.calcudoku.org45.79.143.4043200—
MXcalcudoku.orgmx4.emailowl.com720710
MXcalcudoku.orgmx5.emailowl.com720710
MXcalcudoku.orgmx6.emailowl.com720710
NScalcudoku.orgns1.dnsowl.com172800—
NScalcudoku.orgns2.dnsowl.com172800—
NScalcudoku.orgns3.dnsowl.com172800—
TXTcalcudoku.orgv=spf1 a mx -all7207—
DMARCdmarcforward.emailowl.comv=DMARC1; p=none;300—

TLS and certificates

TLS / SSL

AssessmentNormal configuration
Supported protocolsTLSv1.2、TLSv1.3
Negotiated protocolTLSv1.3
Certificate subjectcalcudoku.nl
IssuerLet's Encrypt
Valid until2026-12-20T20:55 · Remaining when checked: 47 days
Verification detailsCertificate trust: Passed · Hostname match: Passed

HTTP response headers

HTTP

HeaderValue
content-typetext/html; charset=UTF-8
cache-controlno-store, no-cache, must-revalidate
serverApache/2.4.62 (Rocky Linux) OpenSSL/3.2.2
permissions-policyfocus-without-user-activation=(self)
set-cookieRedacted

Identified technologies
jQueryGoogle AnalyticsApache 2.4.62PHP

Pages, Search and Sharing
Meta descriptionOnline Calcudoku Puzzles
Canonical URLhttps://www.calcudoku.org/en
LanguageEnglish (default)
Twitter CardNot detected

Social Sharing Preview

5 fields

robots.txt (opens in a new tab)

16 rules
All bots 0 allowed · 3 disallowed
  • Disallow/forum/faq.php
  • Disallow/bb3/faq.php
  • Disallow/bb3/search.php
bingbot 0 allowed · 0 disallowed
  • IntervalCrawl delay 20 seconds
mj12bot 0 allowed · 1 disallowed
  • Disallow/
weborama 0 allowed · 1 disallowed
  • Disallow/
gptbot 0 allowed · 1 disallowed
  • Disallow/
ahrefsbot 0 allowed · 1 disallowed
  • Disallow/
dotbot 0 allowed · 1 disallowed
  • Disallow/
grapeshot 0 allowed · 1 disallowed
  • Disallow/
proximic 0 allowed · 1 disallowed
  • Disallow/
bytespider 0 allowed · 1 disallowed
  • Disallow/
yandex 0 allowed · 1 disallowed
  • Disallow/
claudebot 0 allowed · 1 disallowed
  • Disallow/
amazonbot 0 allowed · 1 disallowed
  • Disallow/
applebot 0 allowed · 1 disallowed
  • Disallow/bb3/
applebot-extended 0 allowed · 1 disallowed
  • Disallow/bb3/

Sitemaps

1

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