UDP Test
Verify UDP connectivity through proxies, VPNs, firewalls, and NAT using simple terminal commands
UDP Echo Test
Use the commands below to send a UDP packet to our echo server and confirm you receive a reply. This is helpful when validating UDP through SOCKS5 proxies, VPN tunnels , firewalls, and NAT.
Hello, message received from: {ip}, at: {timestamp}, message: {message}Linux
Most distros have "nc" installed. Send a message and wait up to ~2 seconds for the echo reply.
echo "udp-test-from-linux" | nc -u -w 2 65.21.106.102 8080macOS
macOS includes BSD netcat (nc). This sends one UDP datagram and waits briefly for a response.
echo "udp-test-from-macos" | nc -u -w 2 65.21.106.102 8080Windows (PowerShell)
No extra tools required. This uses .NET UdpClient to send and receive a UDP echo reply.
$server = "65.21.106.102"
$port = 8080
$msg = "udp-test-from-windows"
$udp = New-Object System.Net.Sockets.UdpClient
$udp.Client.ReceiveTimeout = 2000
# Send
$bytes = [Text.Encoding]::UTF8.GetBytes($msg)
[void]$udp.Send($bytes, $bytes.Length, $server, $port)
# Receive (echo reply)
$remote = New-Object System.Net.IPEndPoint([System.Net.IPAddress]::Any, 0)
$respBytes = $udp.Receive([ref]$remote)
$resp = [Text.Encoding]::UTF8.GetString($respBytes)
$udp.Close()
$respAndroid (Termux)
Install netcat in Termux, then run the UDP echo command.
pkg update -y
pkg install -y netcat-openbsd
echo "udp-test-from-android" | nc -u -w 2 65.21.106.102 8080iOS (iSH Shell)
On iOS, a practical terminal option is the iSH app (Alpine Linux). Install netcat, then test UDP.
apk update
apk add netcat-openbsd
echo "udp-test-from-ios" | nc -u -w 2 65.21.106.102 8080Troubleshooting tips
- If you get no response, UDP may be blocked by a firewall, NAT rules, or a network policy (common on public Wi-Fi).
- HTTP/HTTPS proxies won’t carry UDP. For UDP traffic, you typically need a SOCKS5 proxy that supports UDP or a VPN.
- If testing through a VPN, try both “VPN on” and “VPN off” to isolate whether the tunnel or your local network is blocking UDP.
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We answer your questions
Got questions? We've got answers! Dive into our frequently asked questions below.
A UDP test checks whether User Datagram Protocol (UDP) traffic can successfully reach a server and receive a response. This is important when using proxies or VPNs because many real-time services—such as VoIP, gaming, streaming, or custom networking tools—rely on UDP. If UDP is blocked or filtered, these services may fail or behave unpredictably.
A UDP echo test sends a UDP packet to a server that is configured to reply (echo) the same data back. If you receive a response, it confirms that outbound and inbound UDP traffic is working correctly between your device and the server.
Yes, but only if the proxy supports UDP traffic. SOCKS5 proxies, such as those provided by ProxySocks5, can handle UDP, while HTTP/HTTPS proxies generally cannot. A UDP echo test helps confirm whether UDP forwarding is actually working through the proxy.
Most modern VPNs support UDP, and many use UDP-based protocols by default for better speed and lower latency. Running a UDP test while connected to a VPN helps verify that UDP packets are not blocked by the VPN tunnel or firewall rules.
You can test UDP from the terminal using tools like netcat (nc). For example, sending a UDP packet to a UDP echo server and waiting for a reply allows you to quickly verify UDP connectivity on Linux, macOS, or Windows.
UDP is connectionless, meaning there is no handshake or guaranteed delivery like TCP. A UDP test relies on receiving an echo response; if no response arrives, it may be due to packet loss, firewall rules, NAT behavior, or filtering by a proxy or VPN.
If TCP works but UDP fails, it usually means UDP traffic is being blocked or filtered somewhere along the path—often by a firewall, router, proxy, or VPN configuration. This is common in restrictive networks or misconfigured proxy setups.
Yes. Gaming, VoIP, video calls, and live streaming often rely on UDP for low latency. A successful UDP echo test indicates that these applications are more likely to function correctly through your proxy or VPN.
Yes. UDP tests can be performed from the terminal on Linux, macOS, and Windows using common networking tools. The commands may vary slightly, but the underlying test logic is the same across platforms.
Running a UDP test before deploying a proxy or VPN setup helps ensure that UDP traffic is properly supported and routed. This avoids unexpected issues later when using applications that depend on UDP performance and reliability.
