🛡️ Free Email Security & Deliverability Checker

Validate SPF lookup limits, detect DKIM selectors, parse DMARC policies, and test port 25 SMTP connectivity.

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Invalid Domain Name

".googlehttps" is not a recognized Internet Top-Level Domain (TLD). Please verify the domain extension.

Please enter a valid domain ending with a recognized Top-Level Domain (e.g. example.com, mybrand.org, or company.co.uk).

🛡️ Free Email Security, SPF, DKIM & DMARC Analyzer

Built by a Hosting Engineer. For Hosting Engineers.

Instant DNS, Email, SSL & Hosting Diagnostics — Free Forever.

🔍 All Diagnostic Tools

🔍 Whois Lookup Check registrar, domain ownership, creation/expiry dates, and nameserver delegation. ⚡ DNS Checker Resolve A, AAAA, MX, NS, TXT, and CNAME records via Google Public DoH. 🛡️ Email Security Validate SPF lookup limits, discover DKIM keys, parse DMARC, and test Port 25 SMTP. 🔒 SSL Checker Inspect SSL/TLS certificate chains, issuer validity, SANs, and expiration countdown. 🖥️ Website & Server Audit web server software, technology stack fingerprints, and HTTP security headers.

🧩 Everything You Need in One Report

Every lookup in DomainsAlone compiles a multi-layered intelligence report covering all crucial web infrastructure components:

🔹 WHOIS & Domain Ownership

Registrar Name
Expiry Date
EPP Status Codes
Last Updated Date
Nameserver Delegation
Contact Privacy Status

🔹 DNS Records (Google DoH)

IPv4 (A Records)
IPv6 (AAAA Records)
Authoritative NS
MX Priorities
TXT Verification
CNAME / WWW

🔹 Email Security & Deliverability

SPF Breakdown (10-Lookup Check)
DKIM Selectors (Google, M365, Zoho)
DMARC Policy Enforcement
Port 25 SMTP Connectivity Test
DNSBL IP Blacklist Reputation

🔹 SSL Certificate & Trust Chain

Full Certificate Chain
Multi-Domain SANs
Signature Algorithms
Validity & Expiration Days
Chain Status (Trusted)
CA Issuer (GTS, Let's Encrypt, etc.)

🔹 Hosting, Server & Network

Server IP (IPv4 & IPv6)
ASN & ISP Network
Hosting Provider
Physical Geolocation
Control Panel (cPanel, Plesk, DirectAdmin)
CDN Detection (Cloudflare, Akamai)

🔹 Security Headers

HSTS
X-Frame-Options
X-Content-Type-Options
Referrer-Policy
Permissions-Policy
Content-Security-Policy (CSP)

🔹 Website Identity & Status

Page Title & Favicon
Meta Description & Generator
HTTP Response Code (200, 301, 403, 500)
Redirect Chain Trace
CMS & Server Fingerprints

🛠️ Optimized for Support Teams & Webmasters

DomainsAlone includes built-in workflows to speed up technical investigations:

Clear Concept Explanations: Built-in glossary tooltips explaining each DNS, Email, and SSL parameter.
Transparent Limitations: Clear declaration of cached versus live data sources.
1-Click Ticket Summary: Instantly copy a Markdown-formatted diagnostic summary to paste into customer support tickets.
Instant Cache Refresh: Force live registry lookups with a single click.

⏱️ This saves 5–15 minutes per customer ticket. Daily.

💙 Free, Forever

DomainsAlone is a free tool created by a web hosting engineer who wanted a single fast page to diagnose 99% of customer issues. And now it's yours too. No signup, no paywalls, and no subscription fees.