Use port scanner

In order to use our DynDNS service (also known as DDNS), the ports required have to be released. In many cases, firewalls block access to the server / nas. You may use our Port Scan in such a case in order to check which ports are blocked or released. Don't forget to release the ports in the router as well.
If you have created a DynDNS url in your pro user account, you will find one in the DynDNS url list Button      , with which the port can be scanned.

Make sure that your computer is configured as a "public network", otherwise external access is not possible.

Note: You may scan the ports of your server or router, a port check (scanning) of other servers or hosts is blocked (impossible) due to security reasons. In order to prevent abuse, your IP address will be saved in our database. With the use of our scanner you are giving your express consent.
Here you find a list of standard ports:
To make sure that the ports are not blocked (without an open port it is NOT POSSIBLE to use a DynDNS service!), please perform a check of the required ports. When you insert your update url into your router, do not forget to edit the port & release. Our scanner can also be used to verify a port forwarding, so you will receive information about possible sources of error.
Port No. Program Application - Information UDP / TCP
Port 21 FTP Server File Upload / Download FTP Yes / Yes
Port 21 FTPES Encrypted Data Transfer Yes / Yes
Port 22 SSH Secure Shell - Server Access Yes / Yes
Port 23 Telnet Terminal Emulation Yes / Yes
Port 25 SMTP Mail Server Mail Transfer - / Yes
Port 80 Webserver - WWW HTTP - Webserver - / Yes
Port 80 WebDAV Data Transfer - / Yes
Port 8080 Webserver (old) HTTP - Webserver Yes / Yes
Port 43 Whois Protocol Domain Data Query - / Yes
Port 53 DNS (Domain Name System) DNS Requests Yes / Yes
Port 79 Finger User Information - / Yes
Port 110 Mail Server Mail Transfer Yes / Yes
Port 115 SFTP Simple File Transfer Protocol - / Yes
Port 139 NetBIOS Network Basic Input Output System Yes / Yes
Port 143 IMAP Mailbox Administration - / Yes
Port 443 HTTPS Encrypted Data Transfer - SSL - / Yes
Port 443 WebDAV Encrypted Data Transfer - / Yes
Port 465 SMTPS Encrypted Mail Transfer - SSL - / Yes
Port 990 FTPS Encrypted Data Transfer Yes / Yes
Port 1433 MSSQL Microsoft SQL Server (Database Management) - / Yes
Port 2638 SQL Anywhere Database Server - / Yes
Port 3051 Galaxy Server Gateway Ticketing Systems Yes / Yes
Port 3306 MySQL Server Database Access Yes / Yes
Port 3389 Windows Remote Desktop Remote Desktop Access Yes / Yes
Port 5900 Real VNC Viewer Access Yes / Yes
Port 51234 Teamspeak Communication - Conferences Yes / Yes
Port 5421 Network Netsupport Manager Yes / Yes
Port 5984 Couch DB Database Server Yes / Yes
Port 6112 Warcraft III Game Software Hosting Yes / -
If the port scan will be successful (port open), you can input your current IP address (you can find on the page How is my IP address) + scanned port in the browser line and already reach directly externally your home server / nas / computer / IP cam. Sample input in the browser line: 000.00.00.00:80 (actual IP address: port). Thus, the prerequisites are created, with our DynDNS service to reach your Webserver statically externally ('s connectivity).
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