Port Checker – Check for Open Ports Online for Free

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Port Checker check for open ports online for free. Our free Port Checking Tool will allow you to check any IP Addresses or Domain names for publicly open ports. We have also provided a comprehensive list of the most commonly used ports that are required to run a certain program on any standard computers. The list below also contains all the default protocols that should be properly using the said ports for example the port 21 it should be running the FTP (File Transfer Protocol). Another example is the port 22 which will be running the SSH Protocol. There are so many ports online but only 24+ of them are the most common.

What is Port Forwarding?

According to Wikipedia Port Forwarding or Port Mapping is an application of network address translation that redirects a communication request from one address and port number combination to another while the packets are traversing a network gateway, such as firewall or router. Refer to this Wikipedia post for more information.

Port Forwarding Checker

Our tool can also help if you have port forwarding projects that need to be checked if a port or a set of ports are successfully broadcasted online.

How it works?

Enter the Domain or IP Address that you want to validate.
At the second input form enter the Port that you want to check. (Note: If you want to check other ports a list of commonly used ports are also provided above.)
Lastly, click select now button and a notification will be displayed weather the port that have scanned is open online or not.

Complete List of Frequently Used Ports

Ports	Protocols	Descriptions
21	FTP	File Transfer Protocol
22	SSH	Secure Shell.
23	Telnet	Terminal Network
25	SMTP	Simple Mail Transfer Protocol
43	WHOIS	“WHOIS” Protocol obtaining the registration of ownership of domain names and IP addresses
53	DNS	Domain Name System
67	DHCP	Dynamic Host Configuration Protocol
69	TFTP	Trivial File Transfer Protocol
80	HTTP	Hyper Text Transfer Protocol
110	POP3	Post Office Protocol Version 3
115	SFTP	SSH File Transfer Protocol. Secure data transmission protocol.
143	IMAP	Internet Message Access Protocol. Application-level protocol for accessing e-mail.
161	SNMP	Simple Network Management Protocol
443	HTTPS	HyperText Transfer Protocol Secure
515	LPD	Line Printer Daemon. Remote printing protocol on the printer.
993	IMAP SSL	Protocol IMAP, supports SSL encryption.
995	POP3 SSL	POP3 protocol supports SSL encryption.
1080	SOCKS	SOCKET Secure. Receiving protocol secure anonymous access.
3128	Proxy	Currently the port often used proxies.
3306	MySql	Mysql DB
3389	RDP	Remote Desktop Protocol – Remote Desktop for Windows.
5432	PostgreSql	Postgres Database
5900	VNC	Virtual Network Computing
5938	TeamViewer	Team Viewer
8080	HTTP	Alternate port for the HTTP protocol

How IP Addresses works?

IP Address works by providing unique 32-bit number (ex: 192.168.1.1) on a certain domain or host and provide the searcher with data’s on the website that contains that IP Address (ex: www.website.com = 192.168.1.1). Domains are created to make it easier for searchers to type and remember the website names rather entering 32-bit numbers on their screens.

How to Secure my IP Address?

To secure your IP Address it is best that you use VPN (Virtual Private Network) providers. These companies will help you hide, secure and redirect malicious attackers on even knowing accurate details about your IP Address.