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Private vs Public Fixed IP IoT SIM

IoT devices generally use fixed IP addresses for the greater security, visibility and control they provide. The choice for the supplier remains between private fixed IP or public fixed IP options, depending on the business needs. 

Fixed VS Dynamic IP addresses

Most IoT SIM cards - the 'tags' the enable a device to connect and transmit data - use static IPs, also known as fixed IP addresses. Static or fixed IPs do not change, which allows devices to establish two-way communication with the servers and transmit data. Fixed IPs provide a permanent address for the device, which directly correlates to better security and control over a device your server is already familiar with. 

Dynamic IPs change depending on what is currently available in your IP pool. Having IoT devices with automatically assigned IPs may be a cheaper option, but it would require the device to re-establish a connection with the server every time its IP changes. Many IoT devices work with dynamic IPs, but more complex and mission-critical devices would need to be addressed on a regular basis without having to add the new IP into the system all the time.

Public VS Private fixed IP addresses

While most IoT devices are enabled with a fixed IP, the choice remains between opting for a public fixed or private fixed internet protocol for the IoT SIM. 

Public Fixed IP IoT SIM card

Choosing a public fixed IP address allows the IoT device to connect to the company server from any internet host. The option is used for global-scale projects, where the device needs to establish two-way communication from various different locations and internet providers while retaining the same IP address, so the system can recognise which device is connecting. Fixed public IPs are generally harder to manage than fixed private IPs due to the increased security requirements and the fact that not many providers offer this option. 

With a fixed public IP,  the customer doesn't have to use a VPN to connect to the server but instead uses a default APN that allows it to reach the core.

Fixed Public IP Standard

The difference between a public fixed IP IoT SIM and a regular public IP SIM is that a standard public IP is assigned by the network provider directly over the Internet and is accessible by all. Public IPs are visible to all Internet users, fairly easy to discover and therefore more susceptible to attacks. To securely use an IoT SIM with a public IP, the business has to rely either on hardware authentication or use a connection like the one above, configured by a service provider that can monitor the sessions. 

Private Fixed IP IoT SIM card

Private fixed IPs not only do not change over time but are also valid only within a predefined network. Private IP addresses come from a number of predefined subsets, leaving the rest of the world's IPs for public use. Private IPs do not send traffic to the Internet but allow the establishment of home networks. 

Devices configured with a private fixed IP need to use an APN to establish a secure connection to the core network. The APN can be defined by the supplier or the customer, depending on the business needs. This type of integration provides great security and end-to-end encryption of data, and it requires a VPN to connect to the core.

Fixed Private IP Standard@4x

Read more on fixed private IPs in our extended article here.

If you are interested to know more about Velos IoT's integration options, do not hesitate to reach out to our team.


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