Karl.fail

karl.fail Profile

Title

Karl Machleidt — Security research & self-hosting

Description

Security research, self-hosting and IT adventures. Notes, projects and practical guides by Karl Machleidt.

Karl.fail is a digital platform designed primarily for individuals seeking to share and explore personal experiences related to failure and overcoming adversity. The website features a user-friendly interface that encourages storytelling through various multimedia formats, including text, images, and videos. Key functionalities include user submissions, comment sections for community interaction, and categorized stories that allow for easy navigation. The site aims to foster a supportive environment where users can reflect on their challenges and learn from others’ experiences. Overall, Karl.fail serves as a unique resource for promoting resilience and understanding the value of failure in personal growth.

Edit Site Info

What technologies does karl.fail use?

These are the technologies used at karl.fail. karl.fail has a total of 5 technologies installed in 3 different categories.

CDN 1

Cloudflare

Miscellaneous 3

HTTP/3 Open Graph RSS

Hosting 1

Cloudflare DNS

karl.fail Traffic Analysis

Karl.fail is ranked #2,879,554 in the world. This website is viewed by an estimated 3 visitors daily, generating a total of 3 pageviews. This equates to about 90.9 monthly visitors. Karl.fail traffic has decreased by 74.85% compared to last month.

Daily Unique Visitors

3

Monthly Visits

91

Pages per Visit

1.00

Daily Pageviews

3

Avg. Visit Duration

n/a

Bounce Rate

100.00%

Global Reach

n/a

Monthly Visits (SEMrush)

85

Monthly Unique Visitors (SEMrush)

85

HypeRank

2,879,554

*All traffic values are estimates only.

karl.fail SEMrush Overview

SEMrush is a complete online advertising and marketing platform that gives a wide variety of tools and features to help businesses and marketers improve their online visibility and optimize their digital marketing strategies.

Domain

karl.fail

RankBased on keywords, cost and organic traffic

n/a

Organic KeywordsKeywords in top 20 Google SERP

0

Organic TrafficVisitors coming from top 20 search results

0

Organic CostEquivalent Google Ads spend for the same traffic

$0.00

Full SEMrush Report →

Backlinks Report

Karl.fail has a total of 2,592 backlinks from 1,553 referring domains and most of them comes from Singapore.

Ad Experience Report

Summary of the ad and abusive experience ratings Google assigns to karl.fail, per platform.

Where is karl.fail hosted?

Karl.fail may be hosted in multiple data centers distributed in different locations around the world. This is probably just one of them.

Other sites hosted on 104.21.5.137

How fast does karl.fail load?

The average loading time of karl.fail is 196 ms. The Desktop speed index is 100 and mobile speed index is 100.

Does karl.fail use compression?

Website compression is the process of reducing the size of website files, such as HTML, CSS, JavaScript, and image files, to improve website performance and load times. Compressing website files can significantly reduce the amount of data that needs to be transferred from the server to the user's browser, resulting in faster page load times and improved user experience. Files on karl.fail are reduced by 71%.

Google Safe Browsing

Google Safe Browsing is a service provided by Google that helps protect users from visiting websites that may contain malicious or harmful content, such as malware, phishing attempts, or deceptive software.

WOT MyWot.com Reputation Ratings

MyWOT (short for "My Web of Trust") is a web-based reputation and rating service that provides users with information about the trustworthiness and safety of websites.

Status

SAFE

SSL Checker SSL Certificate Verify

An SSL (Secure Sockets Layer) certificate is a digital certificate that establishes a secure encrypted connection between a web server and a user's browser. It provides authentication and encryption, ensuring that data transmitted between the server and the browser remains private and protected. karl.fail supports HTTPS.

Security Headers

HTTP security headers tell browsers how to protect visitors: force HTTPS, block clickjacking and limit what scripts can do. karl.fail sends 5 of the 6 recommended security headers, and its SSL certificate is issued by Google Trust Services.

Strict-Transport-Security

missing

Content-Security-Policy

present

X-Frame-Options

present

X-Content-Type-Options

present

Referrer-Policy

present

Permissions-Policy

present

SSL issuer

Google Trust Services

SSL expires

2027-01-13 in 85 days

Email Security

SPF, DKIM and DMARC are DNS records that prove which servers may send email for a domain and tell receivers what to do with forged messages. karl.fail does not receive email, and without SPF/DMARC its name can still be spoofed in emails.

Email provider

no mail server (MX)

SPF

missing

DMARC

missing

DKIM

not found on common selectors

DNSSEC

not signed

AI Crawlers

Websites use robots.txt to allow or block AI crawlers that collect content for training and AI search. karl.fail does not block any known AI crawler.

llms.txt

not found

Verify HTTP/2 & HTTP/3 Support

HTTP/2 (Hypertext Transfer Protocol version 2) is a major revision of the HTTP protocol, which is the foundation of data communication on the World Wide Web. It was developed as an improvement over the previous HTTP/1.1 version to enhance web performance and efficiency. HTTP/3 goes a step further and runs over QUIC instead of TCP, for faster connections and better performance on unreliable networks.

Http Header

HTTP headers are extra portions of records despatched among a consumer (which include an internet browser) and a server at some stage in an HTTP request or response. They offer instructions, metadata, or manipulate parameters for the conversation among the consumer and server.

date: Mon, 19 Oct 2026 14:03:11 GMT
content-type: text/html; charset=utf-8
x-karl-release: c53d68c3bc887a99d4c477119cbce4c8f5e53390a967339fe8d150fe3425001e
report-to: {"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=9Zt968gjIDXF0gOi7KytRR%2BuXYK299kUwvUArrfNwpPS%2BJiyFrfWPipgLU9D%2B0OWxumJb4AfN8EGDTd%2Bn1uKS9IzFg0E7lAAzjqY8T%2FIU1K0idFXGKNFlL0UbMF9PDDMioGJfr5EnrA%3D"}]}
nel: {"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
cache-control: no-store
content-security-policy: default-src 'self'; script-src 'self' 'wasm-unsafe-eval' 'sha256-786AaPdJKyBsyxioaA30HXFiZO/Pi8O3POr4jmEhXO0=' 'sha256-bmLF191EwHQ8NzUiZttQzgbMeR3Sr04Gca2kwq7GXL8=' 'sha256-9hJj35krAGhUCg4ApZ75WcunMGQ3IhmC2HOpUNo/1EQ=' 'sha256-sPr9Imvj8aGOvUCFHQD1KksbQiPU0zZNXF3rGPDYlZA='; style-src 'self' 'unsafe-inline'; img-src 'self' data:; media-src 'self'; font-src 'self'; connect-src 'self'; frame-src 'none'; object-src 'none'; base-uri 'none'; form-action 'none'; frame-ancestors 'none'
permissions-policy: camera=(), microphone=(), geolocation=()
referrer-policy: strict-origin-when-cross-origin
x-content-type-options: nosniff
x-frame-options: DENY
vary: accept-encoding
speculation-rules: "/cdn-cgi/speculation"
server: cloudflare
cf-cache-status: DYNAMIC
content-encoding: br
cf-ray: a4d053239f6c8fc8-WAW
alt-svc: h3=":443"; ma=86400

DNS Lookup

DNS entries (Domain Name System) are a critical component of the Internet infrastructure. They act as directories that translate human-readable domain names (such as example.com) to machine-readable IP addresses. DNS records are stored on DNS servers and help forward internet traffic efficiently.

Whois Lookup

Domain WHOIS is a public database that provides information about domain names, including registered owners, contact information, domain registrars, registration and expiration dates, name servers, and other relevant information.

TLD is not supported.
>>> Last update of WHOIS database: 2026-10-19T14:03:28Z