High-Performance DNS & Mail Server Diagnostic Tools
Verify worldwide DNS propagation across 10+ global locations and test SMTP server handshakes in real time with GMass-style terminal logs. Fast, accurate, and completely free.
Cloudflare Protected
Fast global Anycast edge routing & DDoS mitigation for tools.sohag.com.bd.
Persistent Inputs
All configurations are preserved in local storage. Multi-test without retyping.
Real Sockets & DoH
Native Node.js TCP/TLS sockets for SMTP and RFC 8484 DNS-over-HTTPS queries.
100% Privacy & Free
No passwords or credentials saved to databases. Zero tracking, free forever.
Diagnostic Tools Suite
Select a specialized tool to analyze domain DNS propagation, mail delivery, or network routing.
DNS Propagation Checker
Check DNS records worldwide across Google, Cloudflare, Quad9, AdGuard, and international resolvers. Real-time propagation percentage & expected record comparison.
SMTP Server Tester
GMass-style SMTP verification with interactive socket handshake logs. Test Port 587 (STARTTLS), 465 (SSL), AUTH LOGIN credentials, and delivery. Settings auto-saved locally.
SPF, DMARC & DKIM Validator
Ensure your emails never hit the Spam folder. Audit SPF mechanisms, DMARC policy enforcement (p=reject / quarantine), and MX routing health.
IP Address & Reverse DNS (PTR)
Inspect your public IP address, Autonomous System Number (ASN), ISP organization, city, and reverse DNS pointer record in real time.
Frequently Asked Questions
Learn how global DNS propagation works and how to troubleshoot SMTP connection issues.
How does DNS Checker differ from standard ping?
A standard ping only queries your local internet provider's recursive DNS cache. Our DNS Checker uses authenticated DNS-over-HTTPS (DoH) to query real Anycast authoritative and public resolvers across North America, Europe, Asia, and Oceania to tell you if the entire globe sees your updated DNS records.
Why use GMass-style Live Logs for SMTP?
Standard mail senders simply return "Failed to send". With our live GMass-style log output, you see every raw socket packet: the 220 banner, the EHLO handshake, whether the server supports STARTTLS, the TLS cipher negotiation, and exact server error codes (e.g. 535 Bad Credentials or 550 Relay Denied).
Are my SMTP credentials and passwords secure?
Yes, completely. Your credentials are only held in your browser's localStorage so you can reload the page or multi-test without retyping. The connection request is executed over secure TLS sockets in memory and never persisted in any database or disk logs.
Why are SPF and DMARC crucial for email delivery?
Google and Yahoo enforce strict email sender rules requiring all bulk and transactional senders to have valid SPF and DMARC records configured. Without them, your emails will be automatically rejected (550 error) or routed straight to the spam folder.