Tools & Resources
Free interactive tools we built, plus a hand-picked list of trusted sites we actually reach for — vetted, no fluff, no chatbots.
FixHub tools
Email Setup Finder
Look up likely mail server settings for an email address or domain, with the source and confidence shown.
Open tool →Windows Error Code Decoder
Paste a code like 0x80070005 → its Microsoft-documented meaning, a structural breakdown, and a link to the fix.
Open tool →DNS & Email Checker
Enter a domain → live MX, SPF, DMARC, DKIM, DNSSEC and nameservers. The "why is my email in spam?" check.
Open tool →Email Header Analyzer
Paste raw headers → the delivery path, the delay at each hop, and SPF/DKIM/DMARC results. 100% in your browser.
Open tool →Network Calculator Suite
Subnet/CIDR breakdown, IP range finder, CIDR notation converter, and MAC address OUI lookup — all in one place.
Open tool →JSON / XML Formatter
Paste JSON or XML to pretty-print, validate, and minify it. Shows syntax errors with line numbers.
Open tool →Base64 Encoder / Decoder
Encode or decode Base64 strings with UTF-8 support, URL-safe mode, and file-to-Base64 conversion.
Open tool →Regex Tester
Test regular expressions in real time with syntax highlighting, match highlighting, and capture group breakdown.
Open tool →Password Generator
Cryptographically secure passwords with live entropy strength — generated in your browser, never sent anywhere.
Open tool →HTTP Status Code Decoder
Type any HTTP status code → its official meaning, what it means for visitors, and what to check as the site owner.
Open tool →Network Port Lookup
Look up any port number or service — what runs on 445, 3389, 8019 — for firewall rules and netstat output.
Open tool →World Clock & Time Zone Converter
Convert a time between any two zones and keep a live multi-city clock — daylight-saving handled automatically.
Open tool →QuickBooks Version Lookup
Enter a QuickBooks product code to identify the exact edition, year, and official Intuit download.
Open tool →QuickBooks Download Archive
Direct Intuit installer links for the QuickBooks Desktop editions and years in our archive.
Open tool →Site Search
Search every guide — or paste an error code to jump straight to the fix.
Open tool →Trusted sites & references
Each has genuinely useful content or a utility of its own. We'll keep adding to this list.
Microsoft Learn
Microsoft's official documentation for Windows, Microsoft 365, Server, and PowerShell. The authoritative source we cite throughout FixHub.
cmd.ms
Jump straight to any Microsoft cloud admin portal by typing a word (e.g. exchange.cmd.ms, entra.cmd.ms). Built by a Microsoft Entra PM — perfect for when Microsoft moves the portal URLs.
Group Policy Reference
Microsoft’s Windows 11 25H2 policy spreadsheet lists Administrative Template settings. Filter it to find policy names, paths and registry details.
SS64
A clean command-line reference for Windows CMD, PowerShell, Bash and more — every command, its switches, and real examples.
Sysinternals
Microsoft's free power tools — Process Explorer, Autoruns, PsExec, TCPView and friends. Indispensable for diagnosing what Windows is actually doing.
BleepingComputer
Trusted tech and security news, plus careful malware-removal guides and an active help community.
Windows OS Hub
Deep, accurate how-tos for Windows, Active Directory, PowerShell and Group Policy, aimed at sysadmins.
MXToolbox
Instant DNS, MX, SPF/DKIM/DMARC and blacklist lookups — the go-to for diagnosing email-delivery and DNS problems.
VirusTotal
Upload a file or paste a URL to scan it against 70+ antivirus engines — a quick second opinion before you run something.
Have I Been Pwned
Check whether an email address or password has appeared in a known data breach. Run by security researcher Troy Hunt.
ElevenForum
A huge, well-organized library of Windows 11 (and 10) step-by-step tutorials, plus a helpful community.
PowerShell Gallery
Microsoft's official repository for PowerShell modules and scripts — find and Install-Module trusted packages.
Regex101
Build, test and debug regular expressions live, with a plain-English breakdown of every token.
DNS Checker
Check DNS propagation from servers around the world — confirm a record change has actually gone live everywhere.
Mail-Tester
Send one test email to the address it gives you and get a 0–10 deliverability score — it flags SPF, DKIM, DMARC, blacklist hits and spammy content so you can see exactly why mail lands in spam.
Google Admin Toolbox
Google's Check MX, Dig and Messageheader utilities — verify a domain's mail setup, run raw DNS queries, and analyze email headers straight from Google's own resolvers.
Qualys SSL Labs
The definitive HTTPS/TLS test — grades a site's certificate, protocols and cipher configuration A–F and explains every weakness. Run by Qualys.
DNSViz
Visualize a domain's DNS and DNSSEC chain of trust as a diagram that pinpoints exactly where a DNSSEC or delegation problem breaks.
Downdetector
See whether a service (Microsoft 365, your bank, an ISP…) is down for everyone or just you.
Ninite
Install or update a batch of common Windows apps from one clean installer — no toolbars, no junk.
Spiceworks Community
A long-running Q&A community of IT pros — real-world answers to sysadmin and networking problems.
WizTree
The fastest disk-space analyzer for Windows — it reads the NTFS master file table directly, so it maps an entire drive in seconds.
Everything
Instant filename search across your whole drive (by voidtools) — type a few letters and every matching file appears immediately.
Speedtest
Measure your real download/upload speed and latency (by Ookla) — a quick first check for 'the internet is slow.'
GRC ShieldsUP!
Steve Gibson's classic port-scan test — see which of your ports are exposed to the internet from the outside.