z4 Plus Appliance

NOTICE: z4 Plus Appliance is reaching the End-Of-Sale date. Learn More.


The Untangle NG Firewall z4 Plus is built for small networks, branch offices and retail locations. Ideal for networks with 10-50 users*, this appliance includes the same features as our most popular appliance, the z4, and includes additional RAM and storage capacity. The increased RAM allows for superior performance when running NG Firewall with multiple apps simultaneously, including SSL Inspector, Application Control, Web Filtering, Virus Blocker and Intrusion Prevention. With 256 GB of storage, the z4 Plus allows network administrators to store ample reporting history helping businesses and organizations easily meet any regulatory or compliance related requests.


Hardware as a Service Program
This appliance is also available as Hardware as a Service. Gain all the benefits of using this appliance to protect your network for a low monthly price. Terms and Conditions.


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Get the z4 Plus

The z4 Plus is ideal for small business environments with 10 to 50 users*.

Starting at $18.00 a month*** or purchase for $399.00!

***Subject to HaaS

Terms and Conditions


Tech Specs

z4 Plus
Recommended Users*10 – 50
Recommended DevicesUp to 150
Processor Quad Core Intel Celeron j1900
Storage256 GB mSATA SSD
Interfaces4x GbE
USB Ports4
Built-in LCDNo
Dimensions (w x d x h)6.1″ x 5″ x 1.4″ (156 x 127 x 37mm)
Unit Weight (lbs)2
Shipping Weight (lbs)4
Form FactorFanless Desktop
Firewall Throughput1950 Mbps
NGFW Throughput2500 Mbps
Operating Temperature32° – 122°F (0° – 50°C)
Power Supply12V3A Adapter


*Assuming each user has 2-3 devices.

1 Throughput numbers are based on a single LAN to a single WAN transmission in one direction using IPerf with UDP packet size 1500.

2 NGFW throughput is measured with Application Control, IPS, Web Filter, Virus Blocker and Reports.

Ships with power adapter and cable, VESA mounting brackets and screws, and rubber feet.


  • Cost-effective, desktop, network security appliance that saves energy and space.

  • NG Firewall is pre-installed on the appliance and ready for license provisioning and configuration via ETM Dashboard.

  • Paid software subscription is required with purchase of an appliance. Appliance price does not include a software package.

  • Includes one year hardware warranty (three year warranty is available).

  • Live Support is included in the NG Firewall Complete software package, or as a standalone Live Support subscription.

  • During the first 15 days after receipt of your appliance, you may request a performance upgrade to the next larger appliance. If approved, you will be charged a restocking fee of $150.00 or 10% of the purchase price, whichever is greater, plus the difference in price between the appliances.

  • Please see our Return Policy and Warranty.