SPF Record Checker
Validate SPF records for email authentication
What is an SPF Record Checker?
Validates Sender Policy Framework records used to prevent email spoofing. SPF specifies which mail servers can send email for your domain.
How to Use This Tool
- Enter your input — Provide the value required by SPF Record Checker (e.g., IP, domain, text) in the input field above.
- Configure options — Adjust any settings such as CIDR, key length, or format if the tool provides them.
- Click Calculate/Generate — Results appear instantly in the results panel below.
- Copy or export — Use Copy All or Download (CSV/PDF) to save results. All processing stays in your browser.
Understanding the Results
Output format: Validate SPF records for email authentication. Results are shown with clear labels and can be copied for documentation, ticketing, or IPAM systems.
Accuracy: Calculations follow current RFCs and browser-native crypto where applicable. For DNS/WHOIS lookups, results reflect live network responses at query time.
Tips & Best Practices
• Keep inputs in correct format (e.g., valid IPv4 like 192.168.1.1, valid domain like example.com) to avoid validation errors.
• Bookmark this tool and try related tools: DNS Tools utilities are linked below as Related Tools.
• All NETCUE tools run client-side — no data leaves your browser. For sensitive data, you can use them offline after first load.
Frequently Asked Questions
~all (soft fail) means emails from unauthorized servers should be accepted but marked. Common during SPF migration before switching to -all.
Yes — every NETCUE tool, including SPF Record Checker, is free, requires no login, and runs entirely in your browser. No input is sent to any server.
No. SPF Record Checker processes everything locally via JavaScript. Closing the tab clears the in-memory input. We do not log, store or transmit your data.
Validate SPF records for email authentication — built for network engineers and developers, with instant results, copy/export, and related dns tools tools one click away.
Yes. After the page loads once, it works offline (service worker cache) and is fully responsive on mobile. Inputs stay 16px to avoid iOS zoom.