A Fixed IP SIM provides secure and reliable remote access to IoT devices, routers and equipment in the field. KeySIM offers private and static IP SIM solutions, allowing you to access your devices remotely without relying on changing IP addresses or exposing them to the public internet.
A Fixed IP SIM, also known as a Static IP SIM, assigns a consistent IP address to your device. This allows it to be accessed remotely at any time without the IP changing.
This is essential for applications where you need to:
Unlike standard mobile SIMs, which use dynamic IP addressing, a Fixed IP SIM ensures your devices remain accessible in a predictable and controlled way.
A fixed IP SIM ensures the IP address remains the same even when a multi network SIM switches between networks.
Private fixed IP SIMs reduce exposure to external threats by keeping devices off the public internet. This helps protect against:
Access is controlled through a secure connection, ensuring only authorised users can reach the device.
Devices are not publicly exposed. Instead, users connect via KeySecure VPN, which provides controlled access to devices on the private network. This allows you to:
Access can be structured using VPN groups, allowing you to control which users can access specific devices or sets of SIMs — separating different sites, customers or deployments within the same environment.
Fixed IP SIMs are used wherever consistent, secure remote access matters more than just connectivity.
Access live and recorded footage from cameras in the field without exposing systems to the public internet or relying on changing IP addresses.
Maintain reliable, secure connections to alarm panels, access control systems and security infrastructure across multiple sites.
Log into and configure routers and network equipment in remote locations without requiring an engineer on site.
Monitor and manage machinery, PLCs and industrial systems remotely with secure, persistent access to field devices.
Manage and update digital displays remotely across retail estates, venues and public spaces with reliable fixed IP access.
Keep payment terminals and EPOS systems securely connected and remotely accessible for support and management.
A standard mobile SIM uses dynamic IP addressing, which makes reliable remote access complex. A Fixed IP SIM removes those limitations.
KeySIM's private fixed IP SIMs work in conjunction with KeySecure, our managed VPN solution for IoT deployments. KeySecure provides the secure tunnel through which your team accesses devices on the private network — giving you full control without public internet exposure.
VPN groups allow you to segment access — separating devices by site, customer or deployment type — so the right people only see the devices they should.
Learn More About KeySecureKeySIM offers both private and static IP SIM options alongside our standard IoT SIM connectivity. With simple PAYG pricing, you can choose the right setup for your deployment without being locked into fixed contracts or unnecessary bundles.
KeySIM provides secure remote access solutions designed specifically for IoT and business connectivity. We focus on providing secure, reliable access to devices without exposing them unnecessarily to the public internet.
Our Fixed IP SIM offering includes private IP connectivity, KeySecure VPN for controlled remote access, VPN group segmentation, support across UK networks and simple PAYG pricing — built for real-world deployments.
Devices stay off the public internet — accessed only through controlled, secure connections.
Managed VPN solution built specifically for IoT and business remote access.
Segment devices by site, customer or deployment for granular access control.
Private and public IP options on simple PAYG — no fixed contracts.
K-SOC use Fixed IP and multi-network SIM for 24/7 security monitoring
A leading UK Security Operations Centre relies on KeySIM for mission-critical connectivity across its nationwide monitoring estate — including private fixed IP access to remote devices.
BusinessMole | June 2026
Read the full article →KeySecure Public Access Gateway provides secure inbound remote access to IoT devices operating on KeySIM Private Fixed IP SIM cards without requiring a dedicated public IPv4 address for every deployment. By combining enterprise-grade Network Address Translation (NAT), Destination NAT (DNAT) and Port Address Translation (PAT) within the KeySIM mobile core, organisations can securely publish only the services they require while maintaining the security advantages of private IP addressing.
Each IoT SIM continues to operate using a permanently assigned Private Fixed IPv4 address within the KeySIM private mobile core. Instead of exposing the device directly to the public Internet, KeySIM allocates a unique public IPv4 address and either a TCP port or a UDP port. When inbound traffic reaches this public endpoint, it is translated within the KeySIM core and forwarded to the specified private IP address and destination port on the IoT device. Where an application requires both TCP and UDP connectivity, separate forwarding rules are configured for each protocol.
Unlike assigning a dedicated public IPv4 address to every SIM, Public Access Gateway exposes only explicitly authorised services. All other ports remain inaccessible by default, significantly reducing the external attack surface and helping organisations comply with cybersecurity best practices based on the principle of least privilege.
The service is implemented entirely within the KeySIM mobile core and is independent of the serving Radio Access Network (RAN). Whether the IoT SIM is connected via Vodafone, O2, EE or Three, or deployed internationally using roaming agreements, the same public endpoint remains available. Changes in mobile network, radio technology or serving cell site have no impact on the remote access configuration.
Public Access Gateway is particularly suited to remote management of Teltonika routers, industrial PLCs, RTUs, SCADA systems, CCTV installations, access control equipment, payment terminals, telemetry devices, environmental monitoring systems and other business-critical IoT infrastructure where secure remote administration is required.
By exposing only the required TCP or UDP service through centrally managed DNAT policies, organisations gain predictable remote connectivity without the cost of allocating dedicated public IPv4 addresses to every SIM. Where both protocols are required, separate DNAT rules are configured accordingly. The result is a highly scalable, secure and cost-effective remote access solution for enterprise IoT deployments.
Secure Private VPN Access for KeySIM Private Fixed IP IoT SIM Cards
KeySecure VPN is an enterprise remote access solution that provides secure inbound connectivity to IoT devices operating on KeySIM Private Fixed IP SIM cards. It enables authorised users to communicate directly with remote equipment without requiring each device to have its own public IPv4 address.
Every KeySIM configured for the KeySecure service is allocated a permanently assigned Private Fixed IPv4 address within the KeySIM private mobile core. These addresses are not publicly routable, meaning they cannot be reached directly from the internet. Instead, authorised users establish a secure VPN connection into the KeySecure platform, where they are granted private routed access to the devices they have permission to manage.
This architecture provides the convenience of remote access while significantly reducing the exposure associated with publicly accessible IP addresses.
Traditional mobile broadband connections are designed primarily for outbound internet access. Inbound connections are often impossible because devices operate behind carrier-grade NAT or dynamic IP addressing, making direct remote management difficult or impossible.
KeySecure VPN solves this problem by creating a secure private network between authorised users and KeySIM-connected devices.
Benefits include:
Unlike traditional public port forwarding, KeySecure VPN provides private Layer 3 network connectivity.
Once connected to the VPN, authorised users communicate directly with the remote device's Private Fixed IP address. Any TCP or UDP service running on that device can be accessed, subject to the customer's own network configuration.
This allows engineers to manage remote equipment exactly as though it were connected to their own private network.
Typical applications include:
Not every user requires access to every device. KeySecure VPN supports flexible access groups, allowing organisations to define exactly which Private Fixed IP addresses are accessible through each VPN connection. For example:
An internal IT department or engineering team can be granted access to every KeySIM within the organisation.
Large organisations can create separate VPN groups for engineers responsible for different geographical regions, ensuring each team only accesses the equipment relevant to them.
Managed service providers can securely separate multiple customers, ensuring each customer only has access to their own deployed devices.
Separate VPN groups can be created for different operational teams, such as:
This provides granular access control across large IoT deployments.
KeySecure VPN is suitable for both individual users and enterprise environments. VPN connections can be established from:
Integration with KeySecure Public Access Gateway
KeySecure VPN can also be used alongside the KeySecure Public Access Gateway. The two services are designed for different requirements.
KeySecure VPN is intended for authorised users who require private network connectivity to remote devices. It provides direct access to the Private Fixed IP addresses allocated to KeySIMs and is typically used by engineers, administrators and technical support teams.
In some situations, however, it may not be practical for an end user to establish a VPN connection. They may simply require access to a web interface or application running on a remote device without needing VPN software or private network connectivity.
In these cases, KeySecure Public Access Gateway can publish a specific public IPv4 address and TCP or UDP port combination. Connections received on this public endpoint are translated within the KeySIM mobile core and forwarded directly to the required private IP address and destination port.
This allows organisations to provide simple public access to a specific application or service while continuing to keep the device itself operating on a Private Fixed IP address within the KeySIM network.
For example, an engineering team may use KeySecure VPN for complete remote administration of a router, while an end user is provided with a public web link that connects only to the router's HTTPS management interface or to a Building Management System dashboard.
Remote viewing, diagnostics, firmware updates and recorder administration across single or multi-site CCTV deployments.
Secure remote access to HVAC controllers, energy monitoring systems, lighting control and building automation equipment.
Remote management of PLCs, RTUs, SCADA gateways and industrial control systems.
Administration of Teltonika routers, industrial gateways and other networking equipment installed at remote sites.
Monitoring and maintenance of water, gas, electricity and environmental monitoring infrastructure.
Secure connectivity for roadside equipment, transport systems, digital signage and smart city deployments.
KeySecure VPN provides organisations with a secure, scalable and flexible method of remotely accessing IoT devices without exposing those devices directly to the public internet.
Whether managing a single remote router or thousands of connected assets nationwide, KeySecure VPN delivers private routed connectivity, permanent addressing, flexible access control and enterprise-grade remote management across the KeySIM mobile network.
Common questions about fixed IP SIM cards and secure remote access.
If you need secure, reliable remote access to your devices, KeySIM Fixed IP SIM solutions provide a simple and effective way to manage your infrastructure.