9-point parallel audit of MX, SPF, DKIM, DMARC, BIMI, MTA-STS, and DNSSEC with letter grading.
/domain-audit/LaunchComplete Portal Directory
Site Directory & HTML Sitemap
Quickly navigate all 48 online diagnostic utilities, network calculators, DNS analyzers, and DevOps configuration generators hosted on BestUtilities.org.
All 48 Tools Online & Operational•Zero Persistent Activity Logging•Free & Open to Developers
Showing 48 utilities
Unified Diagnostics & Mail Health
Enterprise-grade automated scanners for domain reputation, mail security, and bulk sender compliance.
Verify compliance with 2024+ bulk sender mandates, DMARC enforcement, and RFC 8058 unsubscribe headers.
/email-readiness/LaunchNetworking, IP & Subnet Calculators
IPv4/IPv6 address planners, CIDR decomposition, port scanners, and packet analysis utilities.
Bitwise IPv4 CIDR calculator with usable host ranges, wildcard masks, and Wi-Fi channel planning.
/subnet-calculator/LaunchHierarchical IPv6 subnetting tool with /48 to /64 nibble boundary calculations.
/ipv6-subnet-calculator/LaunchRFC 5952 canonical formatting, zero-compression, and full 32-character hex expansion.
/ipv6-expand-compress/LaunchGenerate IPv4-mapped, 6to4 prefix (2002::/16), and NAT64 Well-Known Prefix (64:ff9b::/96) formats.
/ipv4-to-ipv6-converter/LaunchClassify link-local, unique-local (ULA), global unicast (GUA), and all-nodes multicast scopes.
/ipv6-scope-analyzer/LaunchInstant WAN IP detection with Leaflet map, ISP ASN lookup, and WebRTC local IP leak test.
/my-ip/LaunchTest open TCP ports from external vantage points with service detection and firewall advice.
/port-checker/LaunchHop-by-hop latency and round-trip time visualization across geographical backbones.
/traceroute-map/LaunchBrowser-based RFC 3550 statistical jitter, packet delay variation (PDV), and bufferbloat test.
/network-jitter-test/LaunchClient-side Wireshark packet capture parsing, TCP flag analysis, and protocol breakdown.
/pcap-analyzer/LaunchEmail Infrastructure & DNS Records
DNS record lookups, mail exchanger priorities, anti-spoofing policies, and disposable inboxes.
Query DNS-over-HTTPS for mail exchangers, priority rankings, and authoritative nameservers.
/mx-lookup/LaunchValidate v=spf1 syntax, evaluate include directives, and prevent the 10-DNS-lookup limit void.
/spf-validator/LaunchBuild RFC 7489 compliant DMARC TXT records with custom rua/ruf report tags and policy modes.
/dmarc-generator/LaunchFetch public keys via DNS selector, test RSA key bit lengths, and verify DKIM TXT formats.
/dkim-inspector/LaunchInspect mail submission ports 25, 465, 587, and 2525 with STARTTLS encryption guidance.
/smtp-port-test/LaunchAnalyze RFC 5322 Received headers, detect mail relay delays, and verify SPF/DKIM authentications.
/email-header-analyzer/LaunchForward-Confirmed Reverse DNS (FCrDNS) verification to ensure deliverability to spam filters.
/ptr-check/LaunchInstant ephemeral email inboxes with custom alias support, live auto-refresh, and zero IP logs.
/temp-email/LaunchDevOps, Server & Config Generators
Production-ready templates for Linux web servers, mail transfer agents, firewalls, and init daemons.
Generate production main.cf and master.cf configs with Milters, TLSv1.3, and submission port 587.
/postfix-config-builder/LaunchAutomated configs with WebSocket upgrades, Let's Encrypt SSL, HSTS, and equivalent Caddyfile tabs.
/nginx-reverse-proxy/LaunchBuild hardened .service and .timer units with sandboxing, auto-restart, and resource constraints.
/systemd-unit-generator/LaunchExport RFC 1035 BIND zone files and Cloudflare DNS migration CSV tables in one click.
/dns-zone-exporter/LaunchSynthesize firewall commands for UFW, iptables, nftables, and FreeBSD Packet Filter (pf).
/firewall-rule-generator/LaunchConstruct Wirefilter firewall expressions to block bad bots, rate-limit APIs, and shield origins.
/cloudflare-waf-builder/LaunchVisual CSP builder with strict nonces, script-src, frame-ancestors, and XSS prevention.
/csp-generator/LaunchBenchmark Deployment Frequency, Lead Time for Changes, Change Failure Rate, and MTTR.
/dora-metrics-calculator/LaunchSecurity, Cryptography & Auth
Client-side cryptographic tools, token inspectors, and security policy validators.
Decode and verify JSON Web Tokens client-side without transmitting secret payloads across networks.
/jwt-inspector/LaunchAnalyze Access-Control-Allow-Origin headers, null origins, and credential exposure hazards.
/cors-evaluator/LaunchCalculate Shannon and character-pool bit entropy with offline dictionary brute-force estimations.
/entropy-meter/LaunchGenerate SHA-256, SHA-512, MD5, and HMAC signatures instantly in the browser.
/hash-hasher/LaunchHardware, Browser & Display Diagnostics
Low-level hardware benchmarking, input latency testers, display calibration, and browser privacy audits.
Test N-Key Rollover (NKRO), key bounce chatter, actuation response, and matrix ghosting.
/keyboard-tester/LaunchInspect Gamepad API axes, stick centering error circularity, deadzones, and trigger thresholds.
/gamepad-tester/LaunchDetect dead pixels, backlight bleeding, color banding, uniformity, and motion blur.
/monitor-test/LaunchBenchmarking shader throughput, 3D polygon fill rates, thermal throttling, and frame rate stability.
/gpu-stress-test/LaunchIdentify logical CPU cores, device memory, GPU renderer strings, and battery power status.
/system-specs/LaunchAudit WebRTC IP leaks, DNS prefetch behaviors, canvas fingerprint vectors, and ad blocker status.
/browser-checker/LaunchCompute unique browser entropy hashes derived from 2D Canvas rendering and Web Audio oscillators.
/fingerprint-analyzer/LaunchReal-time foreign exchange conversions and international transaction fee impact calculator.
/currency-converter/LaunchDeveloper CLI Terminal Gateway
Zero-friction curl endpoints returning clean ASCII tables for terminal-native sysadmins.
curl https://bestutilities.org/ip (supports ?raw=1 for bash scripting and ?format=json).
/ipLaunchcurl https://bestutilities.org/subnet/10.0.0.0/24 (formatted ASCII tables with host bounds).
/subnet/10.0.0.0/24Launchcurl https://bestutilities.org/mx/google.com (queries live MX mail host priorities).
/mx/google.comLaunchcurl https://bestutilities.org/port/22 (threat analysis and recommended UFW firewall syntax).
/port/22Launchcurl https://bestutilities.org/api/cli (interactive terminal manual with all available endpoints).
/api/cliLaunchCompliance, Legal & Transparency
Required Google AdSense, GDPR privacy declarations, terms of use, and verified ads.txt.
Detailed disclosures regarding Google AdSense cookies, zero persistent logging, and data hygiene.
/privacy-policy/LaunchTerms governing use of free diagnostic APIs, acceptable use policy, and liability limitations.
/terms-of-service/LaunchContact information for enterprise tool requests, bug reports, and diagnostic feedback.
/contact/LaunchAbout BestUtilities.org Architecture & Methodology
BestUtilities.org is an independent developer portal designed for network engineers, system administrators, and security practitioners. Every application in this directory is built for ultra-low latency execution, zero persistent logging, and absolute user privacy without third-party tracking.
Looking for machine-readable feeds? Access the live sitemap.xml.