Free Webmaster & Developer Tools

Instant Network & DNS Diagnostic Tools

Xisto Webmaster Diagnostic Tools provide instant, real-time insights into domain registration records, authoritative DNS resolution, server SSL certificates, and network connectivity. Built specifically for developers, system administrators, and site owners, our suite runs direct server-side queries to deliver accurate, raw diagnostic data without rate limits or registration fees.

Effortlessly run live WHOIS lookups, generate full command-line DIG reports, inspect registrar delegation nameservers, verify email authentication headers (MX, SPF, and DMARC), and detect public dual-stack IPv4/IPv6 addresses—all from one unified, ultra-fast dashboard.

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Domain WHOIS Lookup

Check domain registration records, registrar details, registration/expiration dates, and nameservers.

DIG Command DNS Report

Executes full Linux dig +multiline ANY query to inspect all active DNS records, TTLs, and zone authority.

Registrar Nameservers Checker

Queries authoritative DNS delegation to show which nameservers are active at the domain registrar.

Public IP & Dual-Stack Detector

Your current public IP address, ISP reverse DNS hostname, protocol, and browser user-agent.

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Email MX, SPF & DMARC Inspector

Inspect mail exchanger (MX) server priorities, SPF authorization syntax (v=spf1), and DMARC security policy records.

SSL Certificate Inspector

Validate SSL certificate expiry date, days remaining, certificate authority issuer, and SAN domains.

HTTP Response Header Debugger

Inspect HTTP status response codes (200, 301, 302, 404), total response times, and security response headers.