Useful links

Useful external tools

A selection of trusted external services that come in handy alongside our own tools — for speed, DNS, security and email. You go to the external site via a short intermediate step.

Speed & network

Test your internet speed and network connection.

Speedtest (Ookla) The best-known speed test, servers worldwide. Fast.com Super simple, by Netflix. Mainly download. Cloudflare Speed Test Also measures latency and jitter, technically solid. LibreSpeed Open source, privacy-friendly, no ads. OpenSpeedTest Open source HTML5 speed test.

DNS & domains

Analyse DNS, nameservers and domain data.

intoDNS In-depth DNS and mail server health check. DNSViz Visualises DNSSEC and DNS structure. MXToolbox All-round DNS, MX and blacklist checks. SIDN whois (.nl) Official whois for .nl domains. DNSChecker Check DNS propagation worldwide.

Security & SSL

Check certificates, headers and security.

SSL Labs Thorough SSL/TLS analysis with a grade. Security Headers Rates a site's security headers. Hardenize Broad security and configuration check. Have I Been Pwned Check if your email is in a data breach. Internet.nl Tests modern internet standards (NL).

Email

Test email delivery, SPF, DKIM and DMARC.

Mail-Tester Gives your mail a spam score out of 10. MXToolbox Deliverability Checks email delivery and blacklists. dmarcian Specialised in DMARC analysis. LearnDMARC Visually shows how SPF/DKIM/DMARC work. GlockApps Tests where your mail lands (inbox/spam).