Speedify 16.3: Block Traffic by Port, IP Address or Domain With a Custom Firewall

Speedify 16.3 Adds a Custom Firewall

Some traffic shouldn’t leave your device at all: outgoing email from a machine with no reason to send email, BitTorrent on a shared network, or traffic to a server you want to cut off. Speedify 16.3 lets you block those kinds of traffic with rules.

The short version: Speedify 16.3, released on 16 January 2026 for Android, iOS, macOS, Windows, Linux and OpenWrt, adds a custom Firewall. The Speedify Firewall blocks outbound internet traffic that matches rules you set by port, IP address or domain, on every internet connection Speedify is using. Speedify 16.3 also lets Pair & Share cellular sharing hosts, the devices sharing a cellular internet connection with nearby Speedify users, change the sharing speed limit from the default 10 Mbps. Speedify 16.3 fixes a data size problem with the UDP option of Speedify’s Transport Mode setting, fixes a memory problem that sometimes got Speedify shut down on iOS and macOS, fixes wrong latency (delay) readings on Linux, and fixes port forwarding and some website lookups with the Performance Enhancing Proxy (PEP) on OpenWrt.

In this release:

  • Custom Firewall rules that block traffic by port, IP address or domain
  • Pair & Share cellular sharing hosts can change the sharing speed limit
  • A fix for the UDP option of the Transport Mode setting
  • iOS and macOS: memory fix so the operating system no longer shuts Speedify down
  • OpenWrt: port forwarding and DNS fixes with PEP turned on

How to Block Traffic With Speedify Firewall Rules

The Speedify Firewall stops outbound internet traffic that matches a rule before the traffic reaches the destination, whichever internet connection Speedify is using at the time: Wi-Fi, Ethernet or 4G/5G cellular. Rules apply across all your bonded internet connections at once. Firewall rules work in groups, and a group can match on:

  • Ports: a port number or a range of port numbers. Block port 25 to stop outgoing email, or ports 6881 to 6999 to stop BitTorrent.
  • IP addresses: the address of a device or server, such as 192.168.1.100 for a device on your network, or an outside address to cut off a single server.
  • Domains: a website name, such as example.com.

To add a rule, open Settings, then Firewall, add a group and enter what you want to block. The rule takes effect immediately while Speedify is connected. The Firewall guide has the details.

How a Speedify Firewall Group Matches Traffic

Speedify blocks traffic only when the traffic matches everything in the group. A group with a domain and a port blocks the website on that port alone, and nothing else. To block a website on every port, put only the domain in the group and leave Ports and IP Addresses empty. If you only know the domain, don’t guess the ports or IP addresses.

Two limits apply. Firewall rules only work while Speedify is connected, and the Firewall is available on Unlimited accounts only.

Pair & Share Cellular Sharing Hosts Can Change the Speed Limit

Speedify’s Pair & Share cellular sharing feature lets Speedify users on the same local network share and combine cellular internet connections between devices. The host is the device sharing a cellular internet connection. Speedify 16.3 lets the host change the sharing speed limit from the default 10 Mbps. Shared data counts as tethering or hotspot data on the host’s cellular plan, and sharing is only available on Android and iOS with a plan that includes tethering.

Other Fixes and Changes in Speedify 16.3

  • Fixed a problem with the size of data packets when Speedify’s Transport Mode setting is on UDP.
  • On iOS and macOS, fixed a memory use problem that sometimes led the operating system to shut Speedify down.
  • On Linux, fixed invalid latency readings on some devices using low-latency internet connections. Latency is the time data takes to reach a server and come back.
  • On OpenWrt, fixed port forwarding not working correctly with PEP turned on. Port forwarding lets other computers on the internet reach a service running on your device through Speedify.
  • On OpenWrt, fixed some website address lookups (DNS requests) failing with PEP turned on. PEP speeds up web pages and downloads through a Speedify router, and Speedify 16 turned PEP on by default on routers.

How to Update to Speedify 16.3

Speedify 16.3 is out for Android, iOS, macOS, Windows, Linux and OpenWrt. Update every device you use Speedify on, routers included.

Found a problem in Speedify 16.3? Tell Speedify support.

Update Speedify Now

Speedify is the only app that seamlessly combines all of your connections, including WiFi, 4G, 5G, Ethernet, and Starlink, into one stronger connection to keep you online and secure with increased bandwidth, reduced latency, and failover protection.

You can easily share and combine LTE, 4G and 5G cellular connections between devices to create a faster, more reliable connection for everyone using Speedify’s cellular sharing feature, Pair & Share

Make sure you update Speedify on all your devices, including computers, mobile devices and supported routers!

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