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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.

Enter the start port and final port as close as possible, a rather large bandwidth takes a long time to scan. Make sure that the computer is configured as "public network".

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.

Your Host / IP:
Edit Start Port:
Edit End Port:
Port Scan Results

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 Updater-URL into your router, do not forget to edit the port & release. Our scanner can also be used to verify a port forwarding (forwarding), so you will receive information about possible sources of error.
Port Program Application - Information UDP/TCP
21 FTP Server File Upload / Download FTP Yes/Yes
22 SSH Secure Shell - Server Access Yes/Yes
23 Telnet Terminal Emulation Yes/Yes
25 SMTP Mailserver eMail Transfer - / Yes
80 Webserver - WWW HTTP - Webserver - / Yes
8080 (old) Webserver HTTP - Webserver Yes/Yes
43 Whois Protocol Domaindata Request - / Yes
53 DNS (Domain Name System) DNS Request Yes/Yes
79 Finger User Informationen - / Yes
110 Mailserver eMail Transfer Yes/Yes
115 SFTP Simple File Transfer Protocol - / Yes
139 NetBIOS Network Basic Input Output System Yes/Yes
143 IMAP Mailbox Administration - / Yes
443 HTTPS Encrypted Data Communication - SSL - / Yes
465 SMTPS Encrypted eMail Transfer SSL - / Yes
1433 MSSQL Microsoft SQL Server (Database Management) - / Yes
2638 SQL Anywhere Database Server - / Yes
3051 Galaxy Server Gateway Ticketing Systems Yes/Yes
3306 MySQL Server Database Access Yes/Yes
3389 Windows Remote Desktop Remotedesktop Access Yes/Yes
5900 Real VNC Viewer Access Yes/Yes
51234 Teamspeak Communikation - Conferences Yes/Yes
5421 Network Netsupport Manager Yes/Yes
5984 Couch DB Database Server Yes/Yes
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 top of our page) + scanned port in the browser line and already reach directly externally your home server / NAS / computer / IP Cam. Sample input in the browser line: (actual IP Address: port). Thus, the prerequisites are created, with our DynDNS service to reach your Web server statically externally ('s connectivity).
There currently are 129976 Dyn Domains and 162333 user registrier.
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