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Updated: 2026-09-01 09:51 Language: English (default) Access: Normal

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SLF4J Full homepage screenshot

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 2005, this domain has about 21 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 registrar is NameCheap, Inc., a widely used domain service provider. The domain uses the common .org extension, which is not an independent safety signal.

DNS and Email

Nameservers are provided by slf4j.org, indicating managed DNS hosting. No MX record was found. A conventional explicit inbound-mail route is not configured. DNSSEC signatures were not detected, so this additional DNS authenticity protection is not confirmed. The lowest observed DNS TTL is 300 seconds. No CAA record was found; there is no additional DNS-based restriction on certificate issuers.

TLS and Certificates

The public key uses EC with 256 bits. 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/2.4.68 (Debian) OpenSSL/3.5.6. This makes version-targeted checks easier, but is not proof of an exploitable vulnerability. The checked browser-security headers were not detected, leaving fewer explicit browser-side safeguards. No X-Powered-By header was found, reducing one common source of backend fingerprinting information. No obvious internal addresses or debug information were found in the headers. No explicit CDN or WAF marker was found in the response headers.

Technology Stack Analysis

The public page identifies Apache 2.4.68, 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 homepage meta description was detected, leaving snippet selection more dependent on page text. No homepage canonical URL was detected. If duplicate URLs exist, consolidation may be less explicit. No Open Graph metadata was detected, so social previews may depend on platform inference. The title has 5 characters, within a common display range. The observed directives allow indexing and link following.

Hosting and Email

DNSslf4j.org
Hostingslf4j.org
EmailUnknown
Location Germany flagFrankfurt am Main, Hesse, Germany 31.97.181.89

Pages, Search and Sharing

Meta descriptionNot detected
Canonical URLNot detected
LanguageEnglish (default)
Twitter CardNot detected

Unknown

No robots.txt found

No sitemaps found

Registration details RDAP / WHOIS

RegistrarNameCheap, Inc.
Registered2005-04-14
Expires2029-04-14
Domain statusclient transfer prohibited
Nameserversexo1.qos.ch、fran1.qos.ch
DNSSECunsigned

DNS records

TypeNameValueTTLPriority
Afran1.slf4j.org31.97.181.89300
AAAAfran1.slf4j.org2a02:4780:41:4ae9::1300
NSslf4j.orgexo1.slf4j.org300
NSslf4j.orgfran1.qos.ch300
CNAMEwww.slf4j.orgfran1.slf4j.org300

TLS and certificates

AssessmentNormal configuration
Supported protocolsTLSv1.2、TLSv1.3
Negotiated protocolTLSv1.3
Certificate subjectwww.slf4j.org
IssuerLet's Encrypt
Valid until2026-11-13T17:07 · Remaining when checked: 73 days
Verification detailsCertificate trust: Passed · Hostname match: Passed

HTTP response headers

HeaderValue
content-typetext/html
serverApache/2.4.68 (Debian) OpenSSL/3.5.6

Identified technologies

Apache 2.4.68

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