Port Checker
Real-time TCP 3-Way Handshake inspector
YOU
TARGET
Most Commonly Used Ports
Port numbers range from 1 to 65535. Well-known ports are commonly associated with standardized services and protocols.
0 - 1023
Well Known Ports
(HTTP, SMTP, DHCP, FTP)
1024 - 49151
Registered / Reserved Ports
49152 - 65535
Dynamic / Private Ports
| Port | Service / Protocol |
|---|---|
| 20 & 21 | FTP (File Transfer Protocol) |
| 22 | SSH (Secure Shell) |
| 23 | Telnet Remote Login Service |
| 25 | SMTP (Simple Mail Transfer Protocol) |
| 53 | DNS (Domain Name System) |
| 80 | HTTP (Hypertext Transfer Protocol) |
| 110 | POP3 (Post Office Protocol 3) |
| 115 | SFTP (Secure File Transfer Protocol) |
| 123 | NTP (Network Time Protocol) |
| 143 | IMAP (Internet Message Access Protocol) |
| 161 | SNMP (Simple Network Management Protocol) |
| 194 | IRC (Internet Relay Chat) |
| 443 | HTTPS (Hypertext Transfer Protocol Secure) |
| 445 | SMB (Server Message Block) |
| 465 | SMTPS (SMTP over SSL) |
| 554 | RTSP (Real Time Streaming Protocol) |
| 873 | RSYNC File Transfer Services |
| 993 | IMAPS (IMAP over SSL) |
| 995 | POP3S (POP3 over SSL) |
| 3306 | MySQL Database |
| 3389 | RDP (Remote Desktop Protocol) |
| 5432 | PostgreSQL Database |
| 5631 | PC Anywhere |
| 5900 | VNC (Virtual Network Computing) |
| 6379 | Redis In-Memory Database |
| 8333 | Bitcoin Core Node |
| 11211 | Memcached |
| 25565 | Minecraft Server |
Free Public DNS Servers
A list of free public DNS servers that can be used as alternatives to the default DNS servers provided by your ISP.
What is DNS?
The Domain Name System (DNS) is a distributed hierarchical naming system that translates human-readable domain names, such as www.example.com, into numerical IP addresses used by computers to identify and communicate with networked devices.
The Domain Name System (DNS) is a distributed hierarchical naming system that translates human-readable domain names, such as www.example.com, into numerical IP addresses used by computers to identify and communicate with networked devices.
Why use Public DNS?
In some cases, the default DNS servers provided by your Internet Service Provider (ISP) may experience slow response times, restrict access to certain websites at the DNS level, or offer limited security and privacy features. Switching to a reliable public DNS service can provide improved performance, enhanced security, and greater flexibility.
In some cases, the default DNS servers provided by your Internet Service Provider (ISP) may experience slow response times, restrict access to certain websites at the DNS level, or offer limited security and privacy features. Switching to a reliable public DNS service can provide improved performance, enhanced security, and greater flexibility.
List of Free Public DNS Servers
Servers are listed with their IPv4 and IPv6 addresses.
| DNS Provider | Primary DNS | Secondary DNS |
|---|---|---|
| Google - IPv4 | 8.8.8.8 | 8.8.4.4 |
| Google - IPv6 | 2001:4860:4860::8888 | 2001:4860:4860::8844 |
| Quad9 - IPv4 | 9.9.9.9 | 149.112.112.112 |
| Quad9 - IPv6 | 2620:fe::fe | 2620:fe::9 |
| OpenDNS - IPv4 | 208.67.222.222 | 208.67.220.220 |
| OpenDNS - IPv6 | 2620:119:35::35 | 2620:119:53::53 |
| OpenDNS - FamilyShield | 208.67.222.123 | 208.67.220.123 |
| Cloudflare - IPv4 | 1.1.1.1 | 1.0.0.1 |
| Cloudflare - IPv6 | 2606:4700:4700::1111 | 2606:4700:4700::1001 |
| Verisign | 64.6.64.6 | 64.6.65.6 |
| CleanBrowsing - Family Filter | 185.228.168.168 | 185.228.169.168 |
| CleanBrowsing - Adult Filter | 185.228.168.10 | 185.228.169.11 |
| CleanBrowsing - Security Filter | 185.228.168.9 | 185.228.169.9 |
Your IP Address Details
Current public connection metadata
Public Address
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Note:
This tool displays the public IP address
detected by your browser. If you are using
a VPN or proxy, the displayed address may
be the VPN/proxy public IP.