HTTP Status Codes Every Site Owner Should Know (and Fix)
What 200, 301, 404, 410, 429, 500 and 503 actually mean, how search engines react to each one, and the status code mistakes that quietly hurt indexing.
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Domain, IP & DNS
Look up who owns a domain, where it is hosted, its DNS records and whether its IP is on a spam blacklist.
Whois CheckerLook up the public WHOIS record of any domain: registrar, creation and expiry dates, status and name servers.
Domain Age CheckerFind out how old a domain is, plus its creation, last-updated and expiry dates.
Find DNS recordsList the DNS records of a domain: A, AAAA, MX, NS, TXT, CNAME and SOA.
Domain Hosting CheckerSee which company hosts a website: its IP address, country and network owner.
Domain into IPConvert a domain name into its IP address and see the IP's country and network.
Class C Ip CheckerCheck whether several domains share the same Class C IP range.
Blacklist LookupCheck whether a domain's IP address is listed on major spam blacklists (DNSBLs).
My IP AddressSee your public IP address, its version and the country it is registered to.
On-page SEO
Check titles, meta tags, keyword usage and how search engines read a page.
Meta Tags AnalyzerAnalyse a page's title, meta description, keywords, viewport and Open Graph tags.
Meta Tag GeneratorGenerate correct meta tags for a page - title, description, keywords, robots and language.
Keyword Density CheckerFind the most used words on a page and their keyword density.
Search Engine Spider SimulatorSee a page the way a search engine crawler reads it: meta data, headings, links and text.
Code to Text Ratio CheckerMeasure the ratio of visible text to HTML code on a page.
Keywords Suggestion ToolGet keyword ideas from real search suggestions for any seed term.
Email PrivacyCheck whether a page exposes email addresses that spam bots could harvest.
Links & crawling
Audit internal and external links, find broken ones and generate sitemaps, robots.txt and redirects.
Link AnalyzerList every internal and external link on a page, with follow/nofollow status.
Broken Links FinderFind broken links on a page - every link is checked for its live HTTP status.
Website Links Count CheckerCount the total, internal and external links on any page.
XML Sitemap GeneratorGenerate an XML sitemap for a website by crawling its links.
Robots.txt GeneratorCreate a robots.txt file that controls which crawlers can access which parts of your site.
www Redirect CheckerCheck that the www and non-www versions of a domain redirect to one canonical address.
URL Rewriting ToolTurn dynamic URLs with query strings into clean, search-friendly URLs with .htaccess rules.
Speed & server
Measure load time and page weight, check server status and inspect the raw HTML.
Page Speed CheckerMeasure how fast a page and its CSS, JavaScript and images load from our server.
Page Size CheckerCheck the size of a web page's HTML in bytes and kilobytes.
Server Status CheckerCheck whether websites are online and how fast their servers respond.
Get Source Code of WebpageView the raw HTML source code of any web page.
What is my BrowserSee your browser, version, operating system and user-agent string.
Text & developer utilities
Quick helpers for counting words, encoding URLs and hashing text.
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How it works
From a domain to an answer in three steps
1
Enter a domain or URL
Paste it into the analyzer at the top, or open any tool directly from the directory or with ⌘K.
2
We check it live
The tool queries registries, DNS, blacklists or the page itself in real time - nothing is cached or guessed.
3
Read, copy or export
Get a clear result with status badges, then copy it or download it as CSV for your report.
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FAQ
Questions about AceSEO
What is AceSEO?
AceSEO is a free collection of 30 SEO and website tools. You can look up WHOIS and DNS records, find out where a site is hosted, check spam blacklists, analyse meta tags and keyword density, find broken links and measure page size and speed - all in the browser, without creating an account.
Are the tools really free?
Yes. Every tool on AceSEO is free to use and needs no sign-up or API key. The site is supported by advertising.
How do you make sure the tools work?
An automated monitor runs every tool with a known test input each day and checks that the answer is correct - for example that the MD5 of "hello" is right and that google.com resolves to Google's name servers. A tool that fails twice in a row is taken offline until it passes again, and each tool page shows when it was last verified.
Where does the data come from?
Results are generated live when you run a check: WHOIS from the official registry servers, DNS from public resolvers, hosting owners from the regional internet registries (RDAP), blacklist status from the blacklists themselves, and page analysis from the URL you enter.
Can I check a website I do not own?
Yes. The tools only read public information - the same data any browser, search engine or registry lookup can see.