Netperf Server List Verified May 2026
If you find a server IP or hostname on a forum or an old list, do not assume it works. You can verify it yourself using the netperf command-line tool.
Run the following command:
netperf -H <server_address> -p 12865 -t TCP_RR -l 5
What indicates verification?
If the command returns a transaction rate (e.g., Transaction Rate: 1500.00 /sec), the server is verified and active. If it times out or says netperf: connect to host ... failed, the server is dead.
The most reliable verification is a minimal, low-impact Netperf test that confirms the daemon is responsive.
netperf -H <server_ip> -p 12865 -t TCP_RR -l 2
VERSION=$(echo "VER" | nc -q 1 $SERVER_IP $PORT) if [[ ! $VERSION == "Netperf" ]]; then echo "FAIL: Invalid netserver response" exit 1 fi
The keyword "netperf server list verified" is more than SEO metadata—it is a commitment to data integrity. An unverified server is a liability. A verified server is an asset.
By implementing the scripts, processes, and principles outlined in this guide, you will transform your network benchmarking from guesswork into a reliable, defensible engineering practice. Start today: audit your top five most-used test servers. You might be surprised by what you find.
About the Author: Network performance engineer with 12+ years in high-frequency trading and cloud networking. Contributor to the Netperf open-source project.
Further Reading:
The idea of a "verified server list" for Netperf usually refers to finding reliable endpoints (Netserver instances) to run performance benchmarks against. Netperf is a classic networking tool used to measure data transfer rates between two points.
While there is no single "official" global public directory for Netperf, many engineers use it on internal networks or find common endpoints for specific testing environments. The Story: The Latency Hunter
Alex stared at the terminal. The project was simple on paper: optimize the inter-continental database sync. But in reality, the packets were lagging like they were swimming through molasses. Alex needed a benchmark.
"I need Netperf," Alex muttered, recalling the tool's legendary reliability in the Linux community. Step 1: Planting the Seed
First, Alex had to set up the "Netserver"—the silent partner in this performance dance. On the remote data centre machine in Dublin, Alex ran a single command:netserver -p 12800The daemon sat there, listening on port 12800, ready to receive a flood of test data. Step 2: The Verification
Alex didn't just want to start the test; Alex needed to verify the connection was solid before the heavy lifting began. Alex checked the list of verified local nodes. Production Gateway: 10.0.1.5 (Verified: Active) Dublin Sync Node: 172.16.20.40 (Verified: Standby) Alex pinged the Dublin node. Success. The path was clear. Step 3: The Great Stream
From the local terminal in New York, Alex launched the netperf client:netperf -H 172.16.20.40 -p 12800 -l 30 -t TCP_STREAMFor 30 seconds, the two machines talked. No fluff, just raw throughput data. The Result
The terminal flashed: Throughput: 850.45 10^6bits/sec.The "Verified Server List" wasn't a public website; it was the map Alex had built—a list of trusted, listening Netservers that proved the network wasn't the bottleneck. It was the database configuration all along. Key Netperf Concepts for Your "Story" OFA-IWG Interoperability Test Plan - Iol unh
Finding a "verified" list of public servers is challenging because Netperf—unlike iPerf3—is primarily designed for point-to-point testing within private networks or controlled environments. Most "verified" lists actually point to
servers, but there are a few notable Netperf-specific resources maintained by the community. 1. Public Netperf Servers
The most well-known public Netperf servers are maintained by the Bufferbloat project
. These are specifically intended for testing network latency and "bloat" using tools like Global Locations: netperf.bufferbloat.net (Main/East US) netperf-west.bufferbloat.net netperf-eu.bufferbloat.net Verification Note: These servers often require a passphrase to prevent abuse. You must use the option in your Netperf command (e.g., -Z smart-storm ). The daily passphrase is often listed directly on the Netperf Bufferbloat landing page. 2. High-Performance Alternatives (iPerf3)
Because Netperf servers are rare, many network engineers use verified netperf server list verified
server lists for general throughput testing. These are more frequently updated and "verified" by automated scripts for uptime. iPerf3 Server List
: A curated list of global servers (Europe, US, Asia) that provides IP addresses and ports with verified uptime metrics.
: Lists high-bandwidth servers (up to 100 Gbit/s) in data centers like Scaleway and Hurricane Electric. 3. Verification Checklist
When using any server from a list, verify its status before running long tests: Port Check: Netperf typically uses port by default. Control Connection:
Ensure your firewall allows the initial control handshake. Netperf establishes a control connection the data test. Version Compatibility:
Ensure your local client version matches the server (standard is 2.6.x or 2.7.x) to avoid protocol mismatches. 4. Running Your Own Verified Server
For the most reliable results, it is recommended to set up your own instance on a cloud provider like Tencent Cloud sudo apt install netperf Start Server: Test Locally: netperf -H
Finding a verified list of public Netperf servers is challenging because, unlike iPerf3, Netperf does not have a widely maintained public directory. Most Netperf testing is conducted between two private machines that you control.
Below is a guide to the few available public resources and how to verify a Netperf server yourself. Known Public Netperf & Flent Server Resources
Because Netperf is often used via the Flent wrapper tool (which uses Netperf for benchmarking), you can find active servers through Flent-related communities:
The "Flent Fleet": Community members occasionally host public servers for the Bufferbloat project. You can check the Flent Mailing List for the latest volunteer-hosted IPs.
Netperf-Talk Mailing List: This is the primary Expert Archive where developers and network engineers share server information and troubleshooting tips. How to Verify a Netperf Server
If you have an IP address and want to verify if it is an active, reachable Netperf server, use these steps: Netperf Manual
To set up a verified Netperf testing environment, you must deploy a server component ( ) and a client component (
) on separate machines to measure the performance between them. Unlike some tools with a centralized public server list, Netperf is typically used on private instances or cloud nodes you control to ensure verified, interference-free results. 1. Environment Preparation
For a verified test, use two distinct machines (e.g., cloud instances from Alibaba Cloud Tencent Cloud
) within the same network or across the path you wish to test. Tencent Cloud Operating System
: Linux (CentOS/Ubuntu/Debian) is recommended for most accurate results. Dependencies : Install development tools such as to compile from source if a package is not available. Tencent Cloud 2. Server Configuration (
The server machine acts as the listener for benchmark requests. Start the Service to begin listening on the default port (12865). Custom Port
: To avoid conflicts or bypass specific firewall rules, use the netserver -p Use code with caution. Copied to clipboard Verification
: Ensure the service is active by checking the listening ports: sudo netstat -tlnp | grep netserver Use code with caution. Copied to clipboard 3. Client Execution ( If you find a server IP or hostname
Run the benchmarking commands from the second machine (the client) targeting the server's IP address. Command Example TCP Throughput netperf -H
Measures UDP performance (note: does not guarantee delivery). 4. Verifying Results
Once the test completes, focus on these primary metrics provided in the output: Throughput
: Displayed in Mbps or MB/s; this is your primary bandwidth indicator. Transaction Rate
tests, this indicates how many small packets were successfully exchanged per second. CPU Utilization
: Use the reporting flags if you need to verify if the hardware (rather than the network) is the bottleneck. Best Practices for "Verified" Results Firewall Rules
: Ensure the control port (12865) and data ports are open in your security groups or Multiple Instances
: For high-bandwidth environments (like 100G networks), run multiple instances in parallel to saturate the link.
Understanding Netperf: Why a "Verified" Server List Matters When you're trying to figure out why your internet feels sluggish or why your server-to-server transfers are crawling, Netperf is one of the oldest and most reliable tools in the shed. Unlike a simple browser speed test, Netperf gives you the gritty details on TCP and UDP throughput and request-response latency.
However, there is a catch: Netperf requires a "netserver" to be running on the other end. Because Netperf can be resource-intensive, finding a verified public server is significantly harder than finding an iPerf3 server. What is a "Verified" Netperf Server?
In the world of network benchmarking, "verified" usually means a server that is:
Stable: Not prone to random reboots or high internal load that would skew your results.
High-Bandwidth: Hosted on a 10Gbps or better backbone so the server isn't the bottleneck.
Official or Community-Backed: Run by reputable organizations or established network research groups like the Bufferbloat Project. Top Verified Public Netperf Servers
Public Netperf servers are rare because they are easily abused for DDoS attacks. Most modern testing has shifted to iPerf3, but for those who need Netperf’s specific latency metrics, these are the primary reliable options:
netperf-x.bufferbloat.net: This is the gold standard for public Netperf testing. It is specifically designed for network researchers and individuals testing for "bufferbloat."
Note: You must use a daily passphrase with the -Z option to access it.
Local Lab Setup: Most pros recommend against using public servers for sensitive performance tuning. Instead, they spin up a temporary instance on Tencent Cloud or Alibaba Cloud to act as a verified "anchor" for their tests. Quick Comparison: Netperf vs. iPerf3
While you're looking for Netperf servers, you'll likely run into dozens of iPerf3 lists. Here is why you might choose one over the other: A list of public iPerf3 servers... - GitHub
Table_title: EUROPE Table_content: header: | COMMAND | OPTIONS | GB/S | row: | COMMAND: iperf3 -c 138.199.14.66 -p 5201 | OPTIONS:
Netperf is a classic benchmarking tool used to measure network performance between two points, specifically focusing on throughput and end-to-end latency What indicates verification
. Unlike iPerf, which has a more modern set of public test servers, Netperf is primarily designed for point-to-point testing within controlled environments where you control both the client and the server ( iXsystems, Inc. Verified "Server" Deployment Overview Because Netperf uses a client-server model
, there is no official, permanently hosted "verified list" of global public servers like those found for Speedtest or iPerf3. Instead, "verified" servers are typically established in the following ways: Local Infrastructure Verification : The most accurate way to use Netperf is by deploying a
instance on a target node (e.g., a high-performance guest or a physical server). Containerized Deployments
: Modern verified lists often refer to pod manifests in environments like Kubernetes. For example, Isovalent provides verified manifests
for deploying Netperf pods to test BIG TCP performance and Cilium network overlays. Operating System Defaults
: Many enterprise distributions include Netperf in their repositories for internal performance verification. It is pre-installed or easily accessible in systems like FreeNAS® 11.3 and newer for local networking troubleshooting. Deep Review: Core Features & Capabilities Description Throughput Testing
Measures unidirectional bulk data transfer speed (TCP, UDP, SCTP). Baseline bandwidth testing between nodes. Latency Measurement Focuses on end-to-end request/response round-trip times. Crucial for real-time app performance. Protocol Support
Includes TCP, UDP, SCTP, and DLPI (Data Link Provider Interface). Comparing legacy vs. modern transport layers. Detailed Statistics Provides CPU utilization, socket sizes, and message sizes. Debugging bottleneck origins (NIC vs. CPU). Operational Insights Startup Procedure : You must first launch the server process with . It typically listens on port by default.
: Once testing is complete, you should terminate the process using killall netserver to free up system resources. Alternative Tools
: For public testing where you cannot control the server, professionals often switch to
, which has a wider array of community-maintained public endpoints. iXsystems, Inc. Are you looking to test internal cluster performance or seeking publicly accessible endpoints for a specific geographic region? BIG Performances with BIG TCP on Cilium - Isovalent
Netperf does not maintain a public "verified server list" in the way some speed test tools do because it is designed for private, controlled testing between two systems you manage. To use it, you must manually set up a netserver instance on a target machine to act as the server. Netperf Server Setup & Verification
To establish your own verified testing environment, follow these steps to set up and confirm the server is operational:
Start the Server: On the target system (the server), run the netserver command. By default, it listens on port 12865. Command: netserver
Verify Installation: You can verify that both the client and server are working by running a local loopback test. Simply type netperf on the server itself. If successful, it will connect to the local netserver and display a throughput report.
Run a Remote Test: From your client machine, point the tool to your server's IP address: Example: netperf -H
Check Open Sockets: Use ss -tan on Linux to verify that the server is actively listening on the control port. Common Issues If you cannot connect to your server, check the following:
Firewalls: Ensure port 12865 (TCP) is open on the server-side firewall.
Connection Refused: This usually means netserver is not running or is blocked. Double-check that the process is active.
Multiple Ports: If running multiple tests simultaneously, you may need to start netserver on specific ports using the -p flag.
For official documentation and setup guides, refer to the Netperf Manual or the GitHub repository. netperf - 1.4 - ID:636781 | Intel® Ethernet 800 Series