Website Tools

Query a domain's DNS records live from a public resolver of your choice. See every record type at once, with TTLs, mail servers in priority order and email-authentication records highlighted.

Changed a DNS record? Ask 19 public DNS resolvers in the US, Europe and Asia at once and see which ones already return the new value.

Turn IP addresses back into hostnames. We look up each address's PTR record and check that the hostname points back to the same IP — the forward-confirmed reverse DNS test mail servers rely on.

Test how well a domain is protected against email spoofing. We read its SPF, DKIM, DMARC, MX and BIMI records live, explain every problem and give you the exact DNS records to fix it.

Find out in seconds whether a site is up, answering with errors, or down — and why, from DNS through to the server's response.

Run a quick series of checks against a site to see how reliably and how fast it answers right now — handy for spotting intermittent outages and slow spikes.

Test a site's SSL/TLS certificate in seconds: see when it expires, whether browsers trust it, if it matches the domain, and which TLS versions the server still allows.

Find out which HTTP security headers a site sends, how strong they are and exactly what to add. Every header gets a clear verdict and a copy-ready value, plus config for your server.

See the exact status code and response headers a URL returns, follow its redirects, and get a security-header grade with clear fixes.

Follow a URL hop by hop and see every redirect's status code, destination, server and timing — plus clear advice on chains, loops and SEO-safe redirect types.

Look up any HTTP status code to see what it means, why it happens, how to fix it and how it affects SEO — including unofficial codes from Cloudflare, nginx and others.

Your public IP address is shown below the moment the page loads, together with your internet provider, approximate location and what your browser reveals about you.

Find out who an IP address belongs to. Enter an IPv4 or IPv6 address — or a domain — to see its network owner, ASN, routing prefix, registry details and reverse DNS.

Browsers can't send ping packets, so run ping yourself and paste the result here — we'll chart it and explain exactly what every line means.

Run traceroute on your computer, paste the result, and get a hop-by-hop table with a plain-English read of where delays and timeouts really matter.

Create a complete favicon set from letters, an emoji or an image: favicon.ico, the PNG sizes for iPhone and Android, a web app manifest and the tags to paste into your page. Everything is drawn in your browser, so your logo is never uploaded.