Practical infrastructure diagnostics

Free tools to check your email, websites and network.

Focused tools for mail, DNS, certificates and network reputation—built to show the evidence behind every result.

Just for fun Anti-Spam ChallengeTen timed, server-checked questions. Choose simple, maths or computational-god mode. Take the challenge

Home-page performanceWebsite SpeedMeasure a fresh browser load, page payload and latency, then compare connection speeds from 1 Mbps to 2.5 Gbps.Measure your site Live availability Is It Down?Check whether a website or public service responds, see response times and save services to your account watchlist. Check now Email deliverability MailCheckSend one message and inspect SPF, DKIM, DMARC, reputation and transport security. Open tool Message journey Email Header AnalyserDecode every recorded hop, delay and authentication result, then check public relays for current TLS, PTR and blacklist evidence. Open tool Domain + mail route DNS & MXCheck sender policy, every MX route, STARTTLS, SOA agreement and DNSSEC. Open tool TLS inspection TLS InspectorInspect mail and web certificates, chains, protocols, expiry and optional SMTP/IMAP authentication. Open tool Server reputation Blacklist ScanCheck one mail server or run a bounded recursive SPF-range reputation sweep, with PTR evidence and PDF reporting. Open tool Registration intelligence WHOIS LookupCheck authoritative registration, expiry, registrar and publicly available ownership data through RDAP or WHOIS. Open tool Public network intelligence Network DiagnosticsCheck host availability, common services, UK latency, traceroute, an opening-page JPEG, GeoIP, ASN and abuse contacts. Open tool Private browser utility Sensible PasswordsGenerate memorable word-based passwords with optional capitals, numbers and special characters. Open tool