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Internet and network

Speed and call quality testTest delay, jitter and speed, with a focus on phone calls.My IP addressYour public IPv4 and IPv6 addresses, provider and address range.WhoIs lookupWho owns a domain or IP address, when it expires, and its DNS.DNS reportEvery DNS record for a domain, with email setup checked.IP subnet calculatorWork out a network's range, mask and hosts, and split it into subnets.

Computers and devices

Update checkIs this computer, phone and browser up to date? With links to update.Camera and mic testCheck your webcam and microphone before a call.Test print pagePrint an A4 page to check a printer: edges, text, line art and colours.

Make and print

Clean textStrip hidden characters, smart quotes and odd spaces from pasted text.QR code makerMake a QR code for a link, contact or message. Nothing leaves your browser.Wi-Fi QR posterPrint an A4 poster that lets guests join your Wi-Fi by scanning.

Surftec support

Remote supportLet a Surftec engineer connect to your computer to help you.All workingA full-screen confirmation that everything is up and running.

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DMARC checker

Type a domain to check its DMARC record: what happens to forged mail, and where the reports go.

About this tool

DMARC tells other mail systems what to do with email that claims to be from your domain but fails SPF and DKIM: deliver it anyway (none), send it to junk (quarantine) or refuse it (reject). It also asks them to send you reports.

The check runs the full DNS report for the domain, so you see the DMARC record with the SPF and DKIM records it depends on.

Common questions

Which DMARC policy should I use?

Start with p=none and a report address to see who sends as you. Move to quarantine, then reject, once every genuine sender passes SPF or DKIM.

Do I need DMARC for Microsoft 365 or Google?

Yes. Both now expect it for bulk senders, and it is the main protection against someone sending email in your name.

Where should DMARC reports go?

To a mailbox or a DMARC reporting service. They arrive as zipped XML files that are hard to read by hand.