Short answer: To learn everything about a website, chain a few free tools together: WHOIS for ownership, BuiltWith for the tech stack, Similarweb for traffic, the Wayback Machine for history, PageSpeed Insights for performance, and a DNS checker for its records. Each one answers a different question, and together they give you the full picture.
Whenever I land on an unfamiliar site, whether I am vetting a company, researching a competitor, or just curious who is behind something, I run through the same quick investigation. Here is the exact toolkit I reach for and what each one tells me.
Who owns this website and how do I contact them?
Start with a WHOIS lookup. who.is queries domain registrar databases and returns the registration date, registrar, name servers, and, where it is not hidden behind privacy protection, contact details. These days most registrars mask personal data under privacy shields, so do not be surprised if you see a proxy. The registration and expiry dates alone tell you a lot about how established a site is.
To find other domains that might belong to the same owner, look for shared Google Analytics or AdSense IDs. Tools that do this reverse-lookup can surface an owner's entire portfolio of sites from a single fingerprint.
Where is a website hosted?
Enter a URL into a "who is hosting this" style lookup and you get the hosting provider's name. I use this when I need to file a report with a host or simply want to know whether a site sits on a shared budget host or serious cloud infrastructure. For a deeper report, MyIP.ms shows the hosting provider, the physical location, the IP address history, and DNS information, and Netcraft's site report adds the server software and a security overview.
What technology and CMS does a site run on?
My favourite tool here is BuiltWith. Paste in a domain and it reveals the technology stack: whether the site runs WordPress, Drupal, Shopify, or a custom build, plus its analytics, advertising partners, CDN, email provider, and framework. I use it constantly to understand how a competitor put their stack together. A lightweight browser extension called Wappalyzer does a similar job right in your address bar.
How much traffic does a website get?
For traffic estimates, Similarweb is the standard. It gives you estimated monthly visits, traffic sources, top countries, and referring sites. Pair it with SEMrush when you want to see which organic keywords bring people to a site and who its search competitors are. Both have free tiers that are enough for a quick read.
What did a website look like in the past?
The Wayback Machine is one of the most underrated research tools on the internet. Enter any URL and browse snapshots going back decades. I use it to see how a company's messaging or pricing changed over time, to recover content that was deleted, or to confirm when a claim first appeared on a page.
How fast is a website and is it well built?
Run any URL through Google PageSpeed Insights. It scores desktop and mobile performance, reports real-world Core Web Vitals, and gives concrete suggestions to improve. The higher the score, the better the experience. It is the same signal Google uses in ranking, so it doubles as an SEO health check.
How do I check a site's DNS and global reachability?
When a domain moves hosts, its DNS records take time to propagate worldwide. WhatsMyDNS checks A, CNAME, MX, and other records from locations around the globe so you can watch propagation in real time. To confirm whether a site is reachable from other countries, a global ping or uptime checker will test it from dozens of monitoring stations at once.
Which tool answers which question?
| Question | Tool |
|---|---|
| Who owns it? | who.is (WHOIS) |
| Where is it hosted? | MyIP.ms, Netcraft |
| What tech does it run? | BuiltWith, Wappalyzer |
| How much traffic? | Similarweb, SEMrush |
| What did it look like before? | Wayback Machine |
| How fast is it? | PageSpeed Insights |
| Are its DNS records live? | WhatsMyDNS |
What is the non-obvious tip most guides miss?
Cross-reference the fingerprints, do not just read one report. The real detective work happens when you take the Google Analytics or AdSense ID from BuiltWith and reverse-look it up to find sibling sites, then check those siblings in the Wayback Machine to trace an owner's history. Any single tool gives you a fact. Chaining them gives you the story. If you want to be alerted when a domain's WHOIS record changes, I covered domain monitoring in my guide to the best email alert services.
Frequently asked questions
How do I find out who owns a website?
Run a WHOIS lookup at a service like who.is. If the owner uses privacy protection you will see a proxy, but you can still find related sites by reverse-looking-up shared analytics or AdSense IDs.
How can I tell what platform a website is built on?
Use BuiltWith or the Wappalyzer browser extension. They detect the CMS, framework, hosting, CDN, analytics, and advertising technologies a site uses.
How do I see an old version of a web page?
Open the Wayback Machine at web.archive.org, paste the URL, and browse archived snapshots. It is the best way to recover deleted content or track how a page changed over time.
Are these website analysis tools free?
Most have useful free tiers. WHOIS lookups, the Wayback Machine, PageSpeed Insights, and WhatsMyDNS are free, while BuiltWith, Similarweb, and SEMrush offer limited free data with paid upgrades.
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