a toolbox for the web.

Open Port Checker - Test Port Forwarding on Your Router

To test for open ports enter your local/remote IP address and select a port number on the right. Your public IP is preloaded.

What is This Tool?

It is a simple free port forwarding checker that can be used to find out whether a particular port is open or blocked by a firewall.

Although port numbers are essentially abstract certain applications occupy common port numbers. I have listed the most popular ones above which you can click to check against your host.

On a router it is typical that most ports are blocked to prevent malicious activity. Your router is essentially a proxy between you and the internet so the act of allowing a program or game using port or range of ports to pass through is known as port forwarding.

Table of Top 1080 Ports and Associated Protocols

Port Number
Description
1
TCP Port Service Multiplexer (TCPMUX)
5
Remote Job Entry (RJE)
7
ECHO
18
Message Send Protocol (MSP)
20
FTP -- Data
21
FTP -- Control
22
SSH Remote Login Protocol
23
Telnet
25
Simple Mail Transfer Protocol (SMTP)
29
MSG ICP
37
Time
42
Host Name Server (Nameserv)
43
WhoIs
49
Login Host Protocol (Login)
53
Domain Name System (DNS)
69
Trivial File Transfer Protocol (TFTP)
70
Gopher Services
79
Finger
80
HTTP
103
X.400 Standard
108
SNA Gateway Access Server
109
POP2
110
POP3
115
Simple File Transfer Protocol (SFTP)
118
SQL Services
119
Newsgroup (NNTP)
137
NetBIOS Name Service
139
NetBIOS Datagram Service
143
Interim Mail Access Protocol (IMAP)
150
NetBIOS Session Service
156
SQL Server
161
SNMP
179
Border Gateway Protocol (BGP)
190
Gateway Access Control Protocol (GACP)
194
Internet Relay Chat (IRC)
197
Directory Location Service (DLS)
389
Lightweight Directory Access Protocol (LDAP)
396
Novell Netware over IP
443
HTTPS
444
Simple Network Paging Protocol (SNPP)
445
Microsoft-DS
458
Apple QuickTime
546
DHCP Client
547
DHCP Server
563
SNEWS
569
MSN
1080
Socks