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Websites & domains

DNS, WHOIS, SSL, IP, website down checks, headers, website screenshots and other domain lookups.

Websites & domains 15

DNS LookupLook up the DNS records of any domain (A, AAAA, CNAME, MX, NS, TXT, SOA and CAA) with TTL, compare the Cloudflare and Google answers to check propagation, and see whether the domain uses DNSSEC.Open →
MX and Email DNS LookupSee the mail servers (MX records) of a domain, which service it uses (Google Workspace, Microsoft 365, Zoho and others) and whether SPF, DKIM and DMARC are set up so emails don't land in spam.Open →
WHOIS Domain LookupLook up the WHOIS (RDAP) of a domain: when it was registered, when it expires, which registrar holds it, DNS servers, lock status, DNSSEC and whether the domain is available.Open →
URL UnshortenerFind out where a short link (bit.ly, tinyurl, t.co and others) leads before you click: see every redirect, the final address and the code of each hop, and strip tracking parameters.Open →
Domain to IPFind the IP address of a website or domain: every IPv4 and IPv6, the CNAME chain, the hosting provider (Cloudflare, AWS, Google and others) and the country of each server.Open →
IP Address LookupLook up any IP address (or domain): country, approximate city, provider (ASN), time zone, reverse DNS (PTR), whether it is a private IP and whether it is on spam blocklists.Open →
Social Media Link PreviewSee how a link will look when shared on WhatsApp, Facebook, X (Twitter) and LinkedIn, check the page's Open Graph and Twitter Card tags and find out what is missing for a nice preview.Open →
Website ScreenshotTake a screenshot of any website without installing anything: choose the desktop or mobile version, see the image in a browser or phone frame and download it as JPG.Open →
Is the Website Down?Find out whether a website is down for everyone or just you: we test the site from our server and from your browser, and show the response code, response time and redirects.Open →
GZIP Compression TestSee whether a website serves its pages compressed with GZIP or Brotli, the original HTML size, the compressed size and how much data and loading time compression saves.Open →
Open Port CheckerCheck whether a port is open and reachable from the internet on your IP or any server: test router port forwarding for cameras, game servers, SSH, RDP, databases and more.Open →
Email ValidatorCheck whether one or many email addresses are valid: syntax, whether the domain exists and receives email (MX), whether it is a temporary or disposable address, whether it is a generic role address, plus fixes for typos like gmial.com.Open →
View Page SourceView the HTML source code of any page, even on your phone, with line numbers, colors, search, a summary of scripts, styles, images and links, and download the file.Open →
Security Headers CheckTest the HTTP security headers of any website (HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy and others), get an A+ to F grade and see how to fix what is missing.Open →
SSL Certificate CheckerCheck whether a website's SSL (HTTPS) certificate is valid, how many days are left until it expires, who issued it (Let's Encrypt, Google, Sectigo and others), which domains it covers, whether the site uses HSTS, and the certificate history.Open →

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