Netperf Server List Verified Today
There is no single official "Netperf Server List" website. To find a verified server, you should:
Netperf is a classic benchmarking tool used to measure network performance between two points, specifically focusing on throughput and end-to-end latency
. 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
Finding verified public Netperf servers is more difficult than finding iPerf servers because Netperf is less commonly hosted as a public utility. Most "verified" lists actually point to iPerf3 servers, which use different protocols and ports.
However, there are a few established resources for Netperf/Flent (a wrapper for Netperf) testing: Verified Public Netperf/Flent Servers
These servers are part of the Bufferbloat.net and Flent infrastructure and are known to support netserver processes for research and testing: netperf-west.bufferbloat.net (USA - California) netperf-east.bufferbloat.net (USA - New Jersey) netperf-eu.bufferbloat.net (Europe)
Usage Note: These servers often require a passphrase to prevent abuse. You can find the current passphrase at the Netperf Bufferbloat portal and use it with the -Z flag in your command (e.g., netperf -H server -Z [passphrase]). Why You Might See "iPerf" Lists Instead
Many users searching for "netperf server list" are actually looking for iPerf3 servers, which are much more abundant. If your tool or script supports iPerf3, verified lists are maintained at:
iPerf.fr Public Servers: Lists verified locations in Europe (Netherlands, Switzerland, Estonia) and beyond.
iPerf3 Server List: A monitored list that removes servers with less than 90% uptime. How to Verify a Server
If you have a potential host and want to verify it's running netserver, the default control port is 12865. You can test the connection using:netperf -H [hostname] netperf server list verified
If it times out, the server is likely down or the port is blocked. A list of public iPerf3 servers... - GitHub
Public iPerf3 Serverlist * Documentation. Installation. Basic Usage. Test Scenarios & Protocol Differences. Advanced Usage & Tips. GitHub Unable to start netperf server - Ask Ubuntu
Comprehensive Guide to Verified Netperf and iPerf3 Servers for 2026
Testing network performance requires a reliable and "verified" endpoint to measure metrics like throughput, latency, and request-response times. Netperf and iPerf3 are the industry standards for these measurements, operating on a client-server model where a "netserver" or "iperf server" must be active at the target end.
While private setups are ideal for internal testing, public verified servers allow for WAN-wide performance benchmarking. Verified Public Test Servers by Region
Public servers are often maintained by ISPs, hosting providers, or research institutions. Below are verified servers frequently used for network performance testing.
London, UK: lon.speedtest.clouvider.net (Ports 5200-5209, 10G Capacity)
Paris, France: ping.online.net (Ports 5200-5209, 10G Capacity)
Amsterdam, Netherlands: iperf.worldstream.nl (Port 5201, 10G Capacity) Zurich, Switzerland: ch.iperf.014.fr (Ports 15315-15320) North America
New York, NY: nyc.speedtest.clouvider.net (Ports 5200-5209, 10G Capacity)
Los Angeles, CA: la.speedtest.clouvider.net (Ports 5200-5209, 10G Capacity)
Tallahassee, FL: iperf3.velocityonline.net (Ports 5201-5210, 10G Capacity) Asia & Other Regions
Singapore: iperf.sgp.webhorizon.in (Ports 9201-9205, 400M Capacity)
Jakarta, Indonesia: iperf.biznetnetworks.com (Ports 5201-5203, 1G Capacity)
Sao Paulo, Brazil: speedtest.iveloz.net.br (Ports 5201-5209, 2G Capacity) Netperf vs. iPerf3: Which Should You Use?
While both tools measure throughput, they have distinct advantages depending on your technical requirements. A list of public iPerf3 servers... - GitHub
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. There is no single official "Netperf Server List" website
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
The Tale of the Sluggish Network
It was a typical Monday morning at the office of TechCorp, a leading software development company. The IT team was busy setting up a new server for their latest project. As they were configuring the server, they decided to use Netperf, a popular network performance testing tool, to benchmark the server's network capabilities.
The team leader, Alex, asked his colleague, Jack, to set up the Netperf server on the new machine. Jack, in a hurry, quickly copied a list of servers from a colleague's notes without verifying the details. The list included a few IP addresses and server names that were supposed to be part of the Netperf server cluster.
As they began running the Netperf tests, the results were... underwhelming. The team was getting lower-than-expected throughput and higher-than-expected latency. They tried to troubleshoot the issue, but everything seemed fine: the server was properly configured, the network was stable, and the test parameters were correct.
Alex, being the diligent team leader he was, decided to investigate further. He asked Jack to verify the Netperf server list against the official documentation and the team's configuration management database (CMDB). Jack was surprised to find that two of the servers in the list were:
Armed with this new information, the team re-ran the Netperf tests with the corrected server list. This time, the results were impressive: throughput increased by 30%, and latency decreased by 40%.
The Moral of the Story
Verifying the Netperf server list proved to be crucial in troubleshooting the network performance issue. The team's diligence in double-checking the server list saved them from:
The experience taught the team a valuable lesson: always verify the server list and configuration details, especially when working with critical infrastructure. By doing so, they ensured the accuracy of their test results, reduced the risk of errors, and maintained the reliability of their network.
From then on, the team made it a point to thoroughly verify all server lists and configurations, using multiple sources, including official documentation, CMDB, and peer review. This extra step became an essential part of their workflow, ensuring that their network performance tests were reliable and accurate.
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 ( Netperf is a classic benchmarking tool used to
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.
Where can you find initial lists to verify? Several community-driven projects maintain dynamic endpoints:
A large financial services firm was using a static, unverified netperf server list to validate a new 100Gbps backbone. Initial tests showed only 40Gbps throughput. Before scrapping the hardware, they ran a verified netperf server list audit.
Findings:
After replacing those endpoints with verified servers, the same hardware consistently delivered 94Gbps. The company avoided a $2 million unnecessary upgrade.
while read server; do
netperf -H $server -t NULL -l 1 2>&1 > /dev/null
if [ $? -eq 0 ]; then
echo "$server: OK"
else
echo "$server: FAILED"
fi
done < servers.txt
The NULL test simply checks if the control connection works and netserver responds.
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.
Store your server inventory in Git. Run a daily GitHub Action or Jenkins job that:
This gives you a full audit trail of when servers went out of compliance.
Use a shell script or Ansible playbook to test each candidate server. Below is a basic bash verification script:
#!/bin/bash
# verify_netperf_server.sh
SERVER_IP=$1
PORT=12865
TIMEOUT=5
echo "Verifying $SERVER_IP..."
A verified server list has a half-life. Systems change: updates reboot servers, new firewall rules get pushed, containers restart. Follow these rules: