DNS Lookup & Port Propagation Checker
Inspect DNS records (A, AAAA, CNAME, MX, TXT, NS) in real-time across Cloudflare and Google DoH resolvers, and verify server network port connectivity.
Domain Name System (DNS) translates human-readable hostnames into machine IP addresses. To verify resolution, this tool issues RFC 8484 DNS-over-HTTPS queries directly to Cloudflare (1.1.1.1) and Google (8.8.8.8) public endpoints. Standard server ports include 80/443 for web servers, 22 for Linux SSH, 3389 for Windows RDP, and 25565 for Minecraft. SkyRainCloud provisions dedicated static Indian IPv4 addresses with instant DNS propagation on all KVM VPS nodes from ₹649/mo.
Live Global DoH Propagation Results
ReadyStandard Server Port Reference & Terminal Verification Guide
Modern web browsers restrict arbitrary raw TCP socket connections from client JavaScript for sandbox security. To test if your server ports are listening, verify standard services against the reference matrix below:
| Port Number | Protocol / Service | Standard Application | Recommended Firewall Rule |
|---|---|---|---|
| Port 80 | HTTP (Web) | Nginx, Apache, LiteSpeed, Caddy | Allow Public (0.0.0.0/0) |
| Port 443 | HTTPS (SSL/TLS) | Encrypted web traffic, SSL certificates | Allow Public (0.0.0.0/0) |
| Port 22 | SSH Terminal | Linux server remote administration | Restrict to admin IP or Key-Only |
| Port 3389 | RDP (Remote Desktop) | Windows Remote Desktop Protocol | Open on Windows RDP instances |
| Port 25565 | Minecraft Java | Paper, Purpur, Spigot, Fabric game servers | Allow Public for player join |
| Port 3306 | MySQL / MariaDB | Relational database server | Block Public (Bind 127.0.0.1) |
# Linux / macOS (Netcat): nc -zv your-server-ip 443
# Windows PowerShell: Test-NetConnection -ComputerName your-server-ip -Port 3389
Explore Related Compute Infrastructure & Tools
Explore our verified Indian cloud platforms and diagnostic calculators:
Frequently Asked Questions: DNS & Server Network Ports
What is DNS propagation and why does it take up to 24-48 hours?
DNS propagation is the timeframe required for global internet service provider (ISP) recursive resolvers to refresh their cached DNS records with your authoritative nameserver's new IP address. Propagation delay is governed by your record's Time-To-Live (TTL) setting. While most modern resolvers update within 5 to 30 minutes, conservative ISP caches can take up to 24-48 hours.
How does this tool perform DNS lookups without sending data to third parties?
This tool operates client-side inside your web browser using DNS-over-HTTPS (DoH) standard RFC 8484 directly communicating with Cloudflare Public DNS (1.1.1.1) and Google Public DNS (8.8.8.8) using encrypted JSON endpoints. No queries are logged or routed through private intermediary proxy servers.
What are the most common DNS records used in web hosting?
The primary records include: A Record (maps a hostname to an IPv4 address), AAAA Record (maps to an IPv6 address), CNAME Record (aliases one domain name to another), MX Record (designates email mail exchange servers), and TXT Record (used for domain ownership validation, SPF, and DKIM security).
How do I point my domain to a SkyRainCloud VPS?
Log into your domain registrar (e.g. Cloudflare, GoDaddy, Namecheap), open your DNS Management settings, and create an 'A' record with Name '@' (or your subdomain) pointing to the dedicated static IPv4 address assigned to your SkyRainCloud VPS in your welcome email.
What standard server ports should be open on a Linux VPS?
A standard web VPS typically requires port 80 (HTTP) and port 443 (HTTPS) open for web traffic, alongside port 22 for secure SSH terminal administration. Database ports (3306 for MySQL, 5432 for PostgreSQL) should generally be kept restricted to localhost (127.0.0.1) or private firewall rules.
Which port does Windows RDP use?
Microsoft Remote Desktop Protocol (RDP) defaults to TCP/UDP port 3389. On all SkyRainCloud Windows RDP servers, port 3389 is fully open and protected by 2+ Tbps edge DDoS mitigation.
What is TTL and what value should I set before migrating servers?
TTL (Time-To-Live) tells recursive resolvers how long in seconds to cache a DNS answer before requesting a fresh lookup. Prior to migrating servers, reduce your DNS record TTL to 300 seconds (5 minutes). Once migration is verified and stable, restore the TTL to 86,400 seconds (24 hours) to reduce DNS resolution latency.
What port is required for Minecraft server hosting?
Minecraft Java Edition uses default TCP port 25565. Minecraft Bedrock Edition uses default UDP port 19132. SkyRainCloud Minecraft servers include automatic SRV record generation so players can connect using a clean custom domain without typing port numbers.