NTTTCP review
A focused, free command-line benchmark for Windows TCP and UDP throughput testing.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
NTTTCP is a Microsoft command-line network throughput benchmark for measuring performance between sender and receiver systems. It is designed for Windows-based network labs, infrastructure checks, and throughput testing between systems, including scenarios involving Azure virtual machines. The tool supports separate sender and receiver modes, TCP throughput testing, UDP send and receive testing, IPv6, and selection of a network interface by NIC IP. Its desktop deployment and command-line interface suit technical users who want focused network performance measurements rather than a broad diagnostic application.
The published capabilities provide control over how tests run. NTTTCP supports configurable session, processor, and receiver mappings, along with adjustable send and receive buffers. Tests can run for defined periods with warm-up and cool-down phases, which helps structure repeatable measurement sessions. XML result export adds a practical option for retaining or processing output outside the command line. These controls make the product a fit for users comparing TCP or UDP behavior under specific processor, session, buffer, or interface configurations.
NTTTCP’s main trade-off is its narrow platform and scope. It runs on Windows, while Microsoft distinguishes this repository from the separate NTTTCP-for-Linux project. The tool concentrates on network throughput benchmarking and does not present the broader feature range implied by a full diagnostic suite. Choose NTTTCP when a free, open-source Windows utility with TCP, UDP, IPv6, timed testing, configurable mappings, and XML output matches the lab requirement. Choose an alternative when cross-platform operation or wider diagnostic coverage is more important than focused throughput measurement.
NTTTCP pros and cons
- Where it wins
- Supports sender and receiver modes for TCP and UDP tests
- Offers mappings, buffers, timed runs, IPv6, and NIC selection
- Exports test results as XML and is free and open source
- Where it doesn't
- Runs on Windows rather than across multiple operating systems
- Focuses on throughput benchmarking, not a full diagnostic suite
- Command-line operation may require technical network-testing knowledge
NTTTCP fact sheet, pricing and score →
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