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Domain and Network Tools

Find out who owns a domain, inspect its DNS records and email authentication, and see your own IP address and device details.

DNS LookupLook up any domain’s DNS records — A, AAAA, CNAME, MX, NS, TXT, SOA and CAA — individually or all at once.Whois LookupLook up a domain’s registrar, registration and expiry dates, status and nameservers — or find out it’s available to register.SPF & DMARC CheckerCheck a domain’s email authentication — MX, SPF, DKIM, DMARC and BIMI — and get a score with the exact fixes to land in the inbox.What Is My IPYour public IP address, approximate location, ISP and connection details — shown instantly, no input needed.Screen ResolutionSee your screen resolution, browser viewport size, pixel ratio and device details instantly, updated live as you resize.MAC Address LookupFind out which company a network device’s MAC address is registered to, and what its address bits mean.

Domain and DNS checks

A Whois lookup shows a domain’s registrar, registration and expiry dates and name servers; it is the first stop before buying, renewing or transferring a domain. The DNS lookup tool lists A, AAAA, MX, CNAME, TXT and NS records. If a site still shows the old server after you changed hosting, checking the DNS records tells you whether the change has propagated yet. How long that takes depends on the TTL value of each record, so lower it before a planned move.

Is your email landing in spam?

The SPF and DMARC checker reads your domain’s email authentication records and highlights missing or broken configuration. Mailbox providers such as Gmail and Outlook increasingly require SPF, DKIM and DMARC from bulk senders. A common mistake is publishing more than one SPF record; all sending services must be combined into a single SPF record, otherwise validation can fail completely. After fixing a record, wait for propagation and run the checker again to confirm the result.

Your own connection and device

The what is my IP tool shows your public IP address, approximate location and internet provider. If you use a VPN or proxy you will see the VPN server’s address instead, which is a quick way to confirm the VPN is working. The MAC address lookup identifies a network card’s manufacturer from the first part of its address, which helps you recognise unknown devices in your router’s list. The screen resolution tool reports the real pixel size of your screen and browser window.

Related guides

DNS records explained: A, CNAME, MX, TXT and the restDNS is the internet's address book. Knowing the handful of record types that matter lets you move hosts, connect email and debug outages with confidence.Internet speed explained: what your speed test results meanA speed test gives you four numbers. Here's what each means, how much you actually need for streaming, gaming and video calls, and what to do when it's slower than you pay for.What is an IP address and what does it reveal about you?An IP address is the number that routes internet traffic to your device or network. It reveals your approximate location and provider, but not your name or street address. Here is how it all works.SPF, DKIM and DMARC explained: why your emails go to spamMissing or broken authentication records are the most common reason business email ends up in the spam folder. Three DNS records fix most of it.Is the website down for everyone or just me?Before you panic or call your host, spend two minutes working out where the problem is. The cause is usually DNS, an expired certificate, the server, or your own connection.

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