Diagnostic & Network Tools
A comprehensive collection of powerful networking tools to check DNS propagation, look up WHOIS records, and discover public IPs.
What is my IP?
Find out your public IPv4/IPv6 address, ISP, autonomous system number (ASN), and geolocation details instantly.
Global DNS Propagation
Query and compare DNS records (A, AAAA, MX, CNAME, TXT, NS) across multiple global resolvers and local Vietnamese ISPs.
WHOIS Domain Lookup
Lookup real-time domain registration details, expiry dates, registrar info, and name servers for any domain name.
SSL Certificate Checker
Verify SSL/TLS certificate details, expiration date, issuer, cipher suite, and trust chain in real-time.
CSR Generator
Generate a Certificate Signing Request (CSR) and a secure Private Key client-side on the fly for SSL certificates.
CSR Decoder
Decode and inspect the contents of your Certificate Signing Request (CSR) to verify Common Name, SANs, and key details.
SSL Config Generator
Generate secure SSL/TLS server configurations for Nginx, Apache, HAProxy, and Caddy based on Mozilla recommendations.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) in real-time. View header and payload parameters, and verify signature.
SSL Converter
Convert SSL certificates between various formats (PEM, PFX, PKCS#12) for compatibility with Windows IIS and other servers.
IP & Domain Blacklist
Scan your IP or domain against 50+ DNSBL/RBL spam blocklists to check reputation and deliverability.
Bulk IP Blacklist Checker
Scan bulk IP ranges or CIDRs against major anti-spam blacklists (Spamhaus, Barracuda, Spamcop...) and resolve rDNS.
Email Header Analyzer
Analyze email headers to trace transit path, calculate hop delays, and verify SPF, DKIM, and DMARC authentication.
Outlook Safelink Decoder
Decode and parse Microsoft Defender Safelink protection URLs to safely reveal original destinations and M365 metadata.
Email Deliverability Auditor
Generate correct SPF and DMARC TXT records or verify domain settings in real-time to avoid spam folders.
IP/Subnet Calculator
Easily calculate CIDR subnet block size, usable IP range, wildcard masks, and broadcast IP addresses for network planning.
BGP / ASN Lookup
Query Autonomous System Number (ASN) information, IP prefixes, and BGP routing details from global routing registries.
Random Password Generator
Generate highly secure random passwords in bulk. Customize length, character pools, and filter out ambiguous letters locally.
JSON Formatter & Validator
Format, validate, sort, and minify raw JSON strings entirely in your browser with real-time error line detection.
YAML ↔ JSON Converter
Convert back and forth between YAML and JSON formats. Features syntax highlighting, auto-formatting, and validation.
ASCII Art Generator
Convert plain text into stylized retro ASCII art banners with customizable fonts, layouts, and real-time copying.
Custom QR Code Generator
Design custom styled QR codes with gradients, custom dots, round corners, and company logo overlays.
Cron Job Generator
Generate crontab schedule expressions, configure commands, view next run times, and translate schedules into plain English or Vietnamese.
Base64 Encoder/Decoder
Encode text, files, or images into Base64 format, or decode Base64 back into text, previewed images, and downloadable binary files.
URL Encoder/Decoder
Encode and decode URLs or parameter components, with an interactive visual query parameters editor table.
AI JSON Schema Builder
Visually design structured output schemas and export formats compatible with OpenAI, Gemini, LangChain, Pydantic, and TypeScript.
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