Free tool
UDP proxy checkerdoes your proxy support UDP?
Paste a SOCKS5 proxy and this tool opens a real UDP association through it, then sends a live packet to prove the relay actually works. You get a plain yes or no on UDP support, not a guess from the protocol name. Free, no account, no install.
Your list
Empty runs the sample listEvery common format works, mixed freely.
Load from a file
Drop your proxy files here
.txt or .csv, as many as you like. Every line lands in your list.
Probe settings
Protocols to probe
Extra checks
The test
How we know it really does UDP,not just that it said yes
Checking UDP support is not something you can read off a port or a label. A proxy can advertise SOCKS5 and still refuse UDP, or accept the request and quietly forward nothing. The only honest test is to relay a real packet and wait for the reply.
01
Open the association
We ask your SOCKS5 proxy for a UDP ASSOCIATE, the one command in the protocol that can relay UDP, and read the relay address it hands back.
02
Send a real packet
Through that relay we send a live DNS query to a public resolver, a genuine UDP datagram, not a ping or a port check.
03
Require the answer
Only if the DNS reply comes back through the relay do we call it supported. A proxy that grants the association but never forwards the packet is reported as no.
The short answer
Only one protocolcan carry UDP at all
Before you test a single line, the protocol already decides most of it. UDP relay is a SOCKS5 feature and nothing else has it, so an HTTP or SOCKS4 list is a no by definition. What a SOCKS5 list needs is the real check above.
Protocol and UDP
HTTP
No. An HTTP proxy forwards web requests over TCP and has no command for UDP at all.
HTTPS
No. It is an HTTP proxy that opens a TCP tunnel with CONNECT. Still TCP, still no UDP path.
SOCKS4
No. SOCKS4 predates the feature entirely, so it carries TCP connections only.
SOCKS5
Yes, in principle. SOCKS5 defines a UDP ASSOCIATE command and is the only common proxy protocol that can relay UDP. Whether a given SOCKS5 proxy actually turns it on is the one thing this page tests.
Why it matters
What actually needsa UDP proxy
Most people land here because a TCP proxy just failed them at one of these. If none of them is your job, an ordinary SOCKS5 or HTTP proxy is fine and you do not need UDP at all.
Online games
Most real-time game traffic runs on UDP. A proxy that only carries TCP can log you in and then route none of the part that actually plays.
QUIC and HTTP/3
The newest web transport runs over UDP. Through a TCP-only proxy a QUIC site falls back to older HTTP, or fails outright when it is QUIC only.
Voice and video
Calls and live streams use UDP to trade a little loss for low latency. TCP retransmits every dropped packet, which is the one thing a live call cannot afford.
Raw DNS and discovery
DNS is UDP first, and so are many peer-discovery protocols. Routing them through a proxy, instead of leaking them past it, needs a UDP relay.
Questions
UDP proxy FAQ
The things people actually ask about UDP and proxies, answered against what the probe does rather than what sells. If yours is not here, the live chat on this page reaches the people who run the network.
Does my proxy support UDP?
Paste it above and run the check with the UDP test on. The tool opens a SOCKS5 UDP association through your proxy and sends a real DNS query out through the relay, then waits for the answer to come back. If it does, your proxy relays UDP. If it does not, it does not, and you get a plain yes or no rather than a guess from the protocol name.
How do I check if a proxy supports UDP?
Run it through this page with the UDP test enabled. Checking UDP support is not something you can read off a port or a label, because a proxy can advertise SOCKS5 and still refuse UDP. The only honest test is to open a UDP association and actually relay a packet, which is exactly what this does.
Which proxy protocols support UDP?
Only SOCKS5, through its UDP ASSOCIATE command. HTTP and HTTPS proxies forward web requests over TCP and have no UDP path. SOCKS4 came before the feature existed. So if your list is HTTP or SOCKS4, the answer is no before you test a single line, and this page will tell you that too.
Why does my SOCKS5 proxy say it does not support UDP?
Most SOCKS5 proxies disable UDP ASSOCIATE on purpose. An open UDP relay is a favourite tool for DDoS amplification, so operators turn it off to protect the network the addresses live on. A SOCKS5 proxy is free to speak TCP perfectly and still refuse every UDP request, and plenty do.
Is a granted UDP association the same as UDP working?
No, and this is the trap most checkers fall into. Some proxies accept the association and then never forward a single packet, which looks like support right up until you send real data. This tool does not stop at the handshake. It sends a live DNS query through the relay and requires a genuine answer, so a proxy that only says yes is reported as no.
Do HTTP proxies support UDP?
No. An HTTP or HTTPS proxy is built to forward web requests over TCP, and there is no part of the protocol that carries UDP. If you need UDP, you need a SOCKS5 proxy, and then you need to confirm that particular SOCKS5 proxy actually relays it, which is what this page is for.
After the check
Need proxies that just work?Stop re-testing free lists.
Whether or not that one answered on UDP, a free proxy is a snapshot that decays the moment someone else hammers it. If you are tired of re-checking a file every morning, the fix is a pool that is not shared out from under you.
The upgrade
Residential proxies
$0.44per GB, and the balance never expires
Clean pools with city-level targeting and sticky sessions, running on the same network that just probed your list. You stop re-checking a file every morning, because the addresses are not shared out from under you.
Elsewhere on HProxy
Free proxy list
Thousands of live residential, datacenter and mobile IPs, verified around the clock. Something to test.
Datacenter and ISP
Dedicated IPs priced per address rather than per gigabyte, for work that needs a stable, fast exit.
Mobile proxies
Carrier IPs for the targets that treat everything else as a bot.
API and docs
The same checker and the same pools, wired straight into your own code.
Pricing
Every product on one page, with the volume ladder spelled out.