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Entry type: FAQ Entry ID: 62812011, Entry date: 01/27/2017

Which security modules support the dynamic DNS function (DDNS)?

  • Entry
  • Associated product(s)
Using DDNS you can access a module with dynamic IP address via a Fully Qualified Domain Name (FQDN) defined with a specific provider (own).

This simplifies accessing the module in the case of regularly changing IP addresses (for example, with daily forced disconnections by the Internet Service Provider (ISP)).

The security module reports the current WAN IP of the ISP via which the module can be reached to a provider for dynamic DNS (DynDNS.org, no-ip.com, for example). The DDNS provider makes sure that DNS queries to the FQDN of the module are answered with the WAN IP of the module.

The overview below shows which security modules support dynamic DNS.

Security moduleDDNS support
SOFTNET Security Client (SSC) (firmware V3 and higher)Yes
SCALANCE S (firmware V4 and higher)1)Yes
SINEMA Remote ConnectYes
Teleservice Adapter IE Adv.Yes (only with TIA Portal)
CP 343-1 Advanced, CP 443-1 AdvancedNo
CP 1543-1No
CP 1243-1No

Table 1

1) SCALANCE S with firmware V3 can only transmit its current IP address to the DNS server (DDNS client), but cannot resolve any domain names. The firmware update to V4 is available in Entry ID 109477325

2) CPs can dissolve the DNS name of the E-Mail-Server. So the CPs determine the IP address of the E-Mail-Server. The CP can advise its own extern IP address to the DDNS server to be accessible via a fixed extern DNS name.


  • The SCALANCE S modules support the DDNS services of the following providers: DynDNS.org, no-ip.com or a freely defined service.

  • SCALANCE M873, SCALANCE M875 and SCALANCE MD741-1 are compatible with the DDNS services of the provider DynDNS.org.

  • SCALANCE M-800 is compatible with the DDNS services of the providers DynDNS.org and no-ip.com.

  • For DNS, SCALANCE M and SCALANCE MD741-1 need a public IP address that is accessible from the internet.

Further Information
More information about Security Modules is available in the following manuals:

Manual Entry ID
Where can you find information on the topic of "Industrial Security"? 50203404
SIMATIC NET: Industrial Ethernet Security SCALANCE S 109474415 
SIMATIC NET Industrial Ethernet Security SCALANCE S V4 63207600
SIMATIC NET Industrial Ethernet Security Basics and Applications Configuration Manual 67437017
SIMATIC NET Industrial Ethernet Security Getting Started 63207571
UMTS Router with HSDPA SCALANCE M873-0 49507278
SIMATIC NET Telecontrol SCALANCE M875 Operating Instructions 58122394
SIMATIC NET Telecontrol SCALANCE M812/M816 Operating Instructions 90316607
SIMATIC NET S7-400 - Industrial Ethernet CP 443-1 Advanced (GX30) Device Manual Part B 59187252
SIMATIC NET S7-300 - Industrial Ethernet S7-CPs for Industrial Ethernet
CP 343-1 Advanced Device Manual Part B
SIMATIC NET S7-1500 - Industrial Ethernet CP 1543-1 Device Manual 67700710
SIMATIC NET Industrial Remote Communication Remote Networks SCALANCE M-800 Getting Started 78389746
SIMATIC NET Industrial Remote Communication Remote Networks SCALANCE M-800 Web Based Management Configuration Manual


Where can you find instructions for configuring the various options for secure remote access (via VPN Tunnel)? 86645539

Table 02

Security information
In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit