Dive into our data, search now!

We offer robust APIs and data services for domainers, data crawlers, security teams and many more.

384.6 M

Domains known to webXtrend

9.6 M

New domains in the last 30 days

62.8 M

Social media profiles detected

knowstack.dev

Get an email when its DNS, website or certificate changes.

knowstack.dev serves a website of its own over HTTPS and under www. It answers on IPv4 only, with a valid TLS certificate.

906,377 other domains share an IP address with it.

The most recent crawl returned the page title “Knowstack — Free Developer Interview Prep” and 33,940 bytes of HTML.

Domain properties

Property Value Explanation
Top-level domain .dev Statistics for all domains we know under this TLD.
Has website yes A website is hosted under the domain, which does not redirect to an external domain.
Has MX-record no The domain has an MX record.
External redirect no The domain redirects to another domain.
Redirect to https yes The domain redirects to https.
Redirect to www. yes The domain redirects to www.domain.
Only with www. no The domain can only be reached with the subdomain "www".
Only DNS, no website no There are no A or AAAA records in DNS.
IP-Address only IPv4 Shows whether the domain only has IPv4 or IPv6 or both.
SSL-Certificate valid Shows whether the domain has a valid SSL certificate.
Redirects 0 Number of domains that redirect to this domain.
Reverse IP 906,377 Number of domains with the same IP(s).

This data through the API

The data on this page is also available as JSON: /lookup for the key facts, /reverseip, /redirect and /similar for the lists, and /dnshistory with Basic and Premium. A free account comes with an API key and 100 calls a day.

curl -X POST https://api.webxtrend.com/v1.0/lookup \
  -H 'Content-Type: application/json' \
  -d '{"token": "YOUR_TOKEN", "query": "knowstack.dev"}'

Create a free account Read the API docs

Detected social media networks

No social networks found on this website.

Similar websites

Website Similarity
Free Coding Interview Questions, Solutions & Explanations
Solve coding interview questions in JavaScript, TypeScript, Python, Java, and C# — free code runner, company-specific tracks, and guided study plans.
80 %
JS Dojo - Frontend Interview Prep That Actually Works
A structured interview prep platform combining progressive learning paths with in-depth visual explanations. Understand frontend deeply enough that no interv...
80 %
Developer Interview Questions, Answers & Free Practice · Stacktrick
Free tech interview prep: 2,630+ interview questions with model answers, quizzes and mock interviews for JavaScript, React, Java, Python, SQL and AWS.
79 %
Spar — Stop guessing. Solve the right problems.
Spar builds a living map of your programming abilities from how you solve — what you understand, where you get stuck, which cases break your approach — then...
79 %
Anvil — Build Skills. Break Limits. Ace the Interview.
Anvil is a ByteTech LLC product that helps software engineers prepare for technical interviews with lessons that check understanding, spaced review, coding pro…
79 %
AlgoPond — Master Data Structures & Algorithms
Structured learning paths, 50 essential problems, a code visualizer, and timed mock interviews. Master the patterns that appear in every FAANG interview.
78 %
SkillDock — AI-Resistant Coding Assessment Platform for Startups
SkillDock is an affordable coding assessment platform where candidates explain solutions on video. Detect AI cheating naturally. Built for startups & small t...
78 %
Vahalla — Prepare for Modern Technical Interviews
Practice coding interviews with multi-level challenges, system design, and AI-powered debugging. Free, community-driven.
78 %
grip. — Daily DSA & System Design Interview Prep
Spaced repetition for coding interviews. grip. uses ELO-based difficulty and AI feedback to help software engineers master DSA, system design, and behavioral...
78 %
DevPrep.ai
AI-powered developer interview prep
78 %
BuildStep — Find out what you'd fail on before the interviewer does.
Practice the questions you'll actually be asked, get graded on what you actually wrote, and find out what you'd fail on before the interviewer does.
78 %
UIReady — Practice frontend interviews in a real browser editor
Practice JavaScript and frontend UI interview questions in a browser workspace with live tests, framework variants, worked solutions, and structured study pl...
77 %
ReviewDojo — Earn your belts. Prove your craft.
AI-powered code review training platform. Spot bugs in real code submissions, get scored by AI, and earn belt certifications — White to Black. Free to start.
77 %
SyncScript — Technical interviews, on the same line
A shared code editor that runs real code, live. Send one link — your candidate is in the room in seconds.
77 %
TPM PrepBase — Syntax Reference & Interview Prep
Syntax reference and worked interview answers across ten languages and twenty-three tracks — algorithms, system design, databases, APIs, DevOps, SRE, data, s...
77 %
CodeDepth — Master DSA, Coding & Problem Solving
Master DSA, coding, and problem solving through structured roadmaps and interactive practice.
77 %
Frontend Practice & Interview Prep | FineFrontend
Build frontend confidence with coding challenges, interview questions, MCQs, and frontend system design. Practice at your own pace.
77 %
Tuba — Full Stack Developer
Full Stack Developer. Former game dev. Based in Ulaanbaatar.
76 %
Coding Interview Practice & Challenges | Easy Coding School
Practice coding interview questions, join contests, track progress, and build job-ready skills for free with Easy Coding School. Start learning today.
76 %
DSA Course with a Real Judge & Weakness Insights | dsacourse
Learn DSA from zero to interview in C++, Python, Java, JavaScript or C: a real judge, AI hints, mock interviews and weak-pattern insights. 7-day free trial.
76 %

Websites whose start page offers something similar, found by comparing the text of their start pages, across languages. Near-identical copies, parking pages and error pages are left out. The full list of up to 100 comes through the API: similar websites.

Last SSL certificate

Issuer Let's Encrypt
Valid from 10/13/2026
Valid to 1/11/2027
Time until expiry 82 days

Last successful crawl

Title Knowstack — Free Developer Interview Prep
Description Free interview prep for developers: 26 tracks covering React, JavaScript, TypeScript, Node, databases, system design, Solana and more — with reveal-the-answer questions and coding challenges you solve in the browser. No account, no paywall.
Content-Length 33,940 bytes

Title and description as published by the page itself in its own <title> and <meta name="description"> tags.

DNS history

IPv4 address Last updated
216.198.79.65 10/19/2026
64.29.17.65 10/19/2026
216.198.79.65 10/11/2026
64.29.17.1 10/11/2026
216.198.79.1 10/2/2026
Name server Last updated
ns1.vercel-dns.com 9/8/2026
ns2.vercel-dns.com 9/8/2026

The five most recent states of each record type. The full history comes through the API: DNS history.

Most recent redirect domains

No domains found.

Reverse IP neighbours

216.198.79.65 436,653 domains · here since 10/17/2026
Domain On this IP since
zzzzzzz.app 10/15/2026
zzzzdevelopment.com 10/13/2026
zzzx.xyz 9/24/2026
zzzou.app 10/11/2026
zzznaakkee.xyz 10/17/2026
zzyraai.com 9/27/2026
zzyde.com 9/13/2026
zzvictor.pt 9/21/2026
zzumu.com 9/14/2026
zzudle.com 9/23/2026
zztpickleball.com 10/13/2026
zzsfstudy.top 10/11/2026
and 436,640 more
64.29.17.1 469,724 domains · here since 10/5/2026
Domain On this IP since
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.uk 10/9/2026
zzzxc.com 10/9/2026
zzzshift.fun 10/20/2026
zzznaakkee.xyz 9/24/2026
zzzdevelopment.com 10/13/2026
zzzcodex.com 10/19/2026
zzyy6559.xyz 9/19/2026
zzyraai.com 9/27/2026
zzykxx.com 9/16/2026
zzx58.cn 10/17/2026
zztraders.pk 10/15/2026
zzstudio.xin 10/13/2026
and 469,711 more

Sharing an address does not always mean sharing a server: on a CDN or a large hosting platform, millions of unrelated domains answer on the same few addresses. We measured how far that goes in Half the web sits on 276 IP addresses. The complete list of neighbours, also for an IP address, comes through the API: reverse IP lookup.