Free online tools for calculations, documents, web, design, business, research and everyday tasksNo registration required
Home › Email & DNS Diagnostics
FREE ONLINE TOOL CATEGORY

Email & DNS Diagnostics Tools

Explore 22 free Email and DNS diagnostic tools for MX, A, AAAA, SPF, DMARC, DKIM, SMTP and DNS record checks. The collection is organized for domain owners, mail administrators and technical users and focuses on diagnosing public email and DNS configuration without paid APIs.

What you can do with Email & DNS Diagnostics tools

Domain owners, mail administrators and technical users can use these tools from their dedicated pages. Each tool includes its purpose, instructions, result guidance and links to closely related utilities.

Choose a tool by name or filter the category. For calculations, verify units and assumptions before relying on the result. For text, document, web and diagnostic tools, review generated output before using it in production, publication or formal decisions.

22 free toolsDedicated pagesMobile friendlyNo registration required
Browse by level
Levels are discovery guides, not formal academic classifications.

Calculators & Analysis

1 tools
Email & DNS DiagnosticsIntermediate

Email Header Analyzer

Email Header Analyzer for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →

Converters & Formatters

21 tools
Email & DNS DiagnosticsIntermediate

A Record Lookup

A Record Lookup for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

AAAA Record Lookup

AAAA Record Lookup for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

BIMI Record Checker

BIMI Record Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsAdvanced

DKIM Record Checker

DKIM Record Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsAdvanced

DMARC Record Generator

DMARC Record Generator for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsAdvanced

DMARC Record Checker

DMARC Record Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsAdvanced

DNSBL Blacklist Checker

DNSBL Blacklist Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

Domain Health Checker

Domain Health Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

Email Extractor

Email Extractor for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

HTTP Availability Checker

HTTP Availability Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

HTTPS Availability Checker

HTTPS Availability Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

MTA-STS Record Checker

MTA-STS Record Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

MX Record Lookup

MX Record Lookup for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

NS Record Lookup

NS Record Lookup for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

SMTP Banner Checker

SMTP Banner Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

SOA Record Lookup

SOA Record Lookup for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsAdvanced

SPF Record Generator

SPF Record Generator for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsAdvanced

SPF Record Checker

SPF Record Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

TCP Port Checker

TCP Port Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

TLS-RPT Record Checker

TLS-RPT Record Checker for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →
Email & DNS DiagnosticsIntermediate

TXT Record Lookup

TXT Record Lookup for the domain, address or diagnostic information you enter.

New · usage tracking activeOpen tool →