Is UDP faster than TCP?

It starts faster, with no handshake, and never waits for resends, so it has lower delay for real-time traffic. For bulk downloads TCP and QUIC reach similar speeds.

Voice and video calls, online games, live streaming, DNS lookups, WebRTC and QUIC, the transport under HTTP/3.

Can a proxy handle UDP?

HTTP proxies cannot. SOCKS5 can in principle through UDP ASSOCIATE, but only if both the provider and your app support it.

Do CleanProxies proxies support UDP?

No. They relay TCP traffic: HTTP(S) on every product and SOCKS5 on ISP proxies. Use them for websites and APIs, not games or voice.

Why does WebRTC leak my IP through a proxy?

WebRTC discovers network addresses over UDP outside the browser's proxy settings. Disable or restrict it in the browser or profile, then test.

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What Is UDP (User Datagram Protocol)?

UDP (User Datagram Protocol) is a lightweight internet protocol that sends independent messages, called datagrams, without opening a connection and without resending lost data. It trades reliability for speed, which suits voice and video calls, online games, DNS and HTTP/3.

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how it works

How UDP works

UDP is one of the oldest internet protocols, defined in RFC 768 in 1980. Its header is just 8 bytes: source port, destination port, length and checksum. There is no handshake, no acknowledgement and no ordering; a datagram either arrives or it doesn't, and the application decides what to do about it.

That simplicity is the point. A video call would rather skip a lost frame than pause for a resend, and DNS can answer a lookup in a single datagram each way. QUIC, the transport under HTTP/3, runs over UDP and builds its own reliability and encryption on top.

TCP
Connection
Handshake before data
Delivery
Guaranteed, in order, lost data resent
Header size
20 bytes or more
Typical uses
Websites, APIs, email, file transfer
UDP
This term
Connection
None: send immediately
Delivery
Best effort, no resends, no ordering
Header size
8 bytes
Typical uses
Calls, games, streaming, DNS, QUIC / HTTP/3

why it matters

Why UDP matters for proxy users

Most proxies do not carry UDP at all. HTTP proxies and CONNECT tunnels only relay TCP. The SOCKS5 standard defines a UDP ASSOCIATE command, but support for it varies widely between providers and apps.

CleanProxies proxies are built for TCP traffic: HTTP(S) on every product and SOCKS5 on static ISP proxies. Do not plan on UDP through them.

UDP: what it means for you

Browsers fall back from HTTP/3 to HTTP/2 over TCP when they use an HTTP proxy, so websites still work normally.
WebRTC, which powers in-browser calls, gathers candidates over UDP outside the proxy and can expose your IP; run a WebRTC leak test.
Games, voice apps and some VPN protocols need UDP; a TCP-only proxy will not route them.
DNS over UDP from your own machine bypasses the proxy unless the proxy resolves names for you; see DNS leaks.

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