Instant checks for your public IP, email authentication records, mail servers, and email headers — no login, no software, no data stored.
Your public IP as seen by the internet. Useful for firewall rules, VPN troubleshooting, and remote access configuration. Your IP is sent to ipinfo.io to retrieve location and ISP information — no other data is transmitted.
Checks SPF, DMARC, and DKIM records for a domain. These three mechanisms protect against email spoofing and phishing. All lookups go directly to Cloudflare’s public DNS — nothing passes through our servers.
Shows the mail servers configured for a domain, their priority order, and detects the email provider. Useful for migration planning, troubleshooting, and due diligence.
Paste the raw headers from a suspicious or undelivered email. We’ll extract the routing path, originating IP, and authentication results in plain English.
See your public IP, ISP, and location instantly — no input needed.
Check SPF, DMARC, and DKIM to see if a domain is protected against spoofing.
Identify mail servers, priority order, and detect the email provider from DNS.
Trace an email’s journey hop by hop and decode SPF / DKIM / DMARC results.
attenu8 helps businesses lock down email configuration, stop spoofing, and protect their domain reputation.
Talk to us about email security →