Broadband Test Tools UK

Use free broadband diagnostics for speed, ping, lag, dropouts, Wi-Fi coverage, router limitations, packet loss and full-fibre availability.

Choose the right diagnostic

Start with the symptom, not the biggest speed number

A speed test checks capacity. Ping, packet loss, loaded latency and bufferbloat explain why gaming, video calls or browsing can still feel poor. Use the matching tool below, then follow the linked diagnosis.

Broadband test tools dashboard showing connection quality, speed, ping, jitter, packet loss and bufferbloat

Core tests

Internet performance and stability tools

Ping Test

Measure latency, jitter and failed browser requests across 32 samples.

Run the Ping Test

Packet Loss Test

Check for failed or late requests that can cause rubber-banding and call glitches.

Run the Packet Loss Test

Bufferbloat Test

See whether downloads or uploads cause latency to rise while the line is busy.

Run the Bufferbloat Test

Broadband Fault Diagnosis Wizard

Answer four questions to find the most useful diagnostic test and next troubleshooting step.

Find My Fault Route

Internet Speed Calculator

Estimate download times and the speed needed for files, games and updates.

Open the Speed Calculator

Broadband Uptime Monitor

Track repeated HTTPS requests, response-time spikes and failed checks; export a timed report.

Open Uptime Monitor

Wi-Fi Coverage Comparison

Compare measured download speed and ping room by room to help locate weak areas.

Compare Wi-Fi Rooms

SQM / QoS Calculator

Calculate router traffic-shaping limits from measured wired download and upload speeds.

Calculate SQM Settings

Router Speed Bottleneck Calculator

Check 100Mbps, gigabit and 2.5Gbps port limits before buying network hardware.

Check Router Bottlenecks

Connection identity

Check your public IP, ISP and NAT boundary

IPv4 & IPv6 Connectivity Test

Check whether your browser can load IPv4-only and IPv6-only HTTPS resources.

Check IPv6 Connectivity

What Is My IP & CGNAT Checker

See your public IPv4/IPv6, ISP and ASN, then compare the router WAN address for CGNAT or double NAT.

Check My IP Address

Coverage and upgrades

Check whether a faster connection is available

Broadband Availability Checker

Use a postcode to review local Ofcom coverage context and likely network routes.

Check Broadband Availability