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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.

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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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SPF checker

Type a domain to check its SPF record: which servers may send its email, and whether the record breaks any rules.

About this tool

SPF (Sender Policy Framework) is a DNS record listing the servers allowed to send email for a domain. Receiving mail systems check it to spot forged mail. A broken SPF record sends genuine email to junk.

The check runs the full DNS report for the domain, so you also see DKIM, DMARC, the email provider and every other record.

Common questions

Why does SPF fail with "too many lookups"?

An SPF record may make at most 10 DNS lookups, counting every include inside every include. Remove services you no longer use, or replace includes with the addresses they stand for.

Can a domain have two SPF records?

No. Two records starting v=spf1 make SPF fail for everyone. Merge them into one.

Should SPF end in ~all or -all?

Use -all once you are sure every sender is listed; ~all (soft fail) while you are still checking. DMARC decides what finally happens to failing mail.