A Deep Technical Breakdown of Proxies: UDP, Leaks, and Stability

[Petro1988]

The proxy market has never been louder, more competitive, or — let’s be honest — more confusing. Providers promise clean IPs, mobile-grade quality, anti-detect compatibility, and undetectable anonymity, yet real-world performance often looks nothing like the marketing.

This report is based on months of large-scale testing using internal diagnostics and custom checkers. The objective was simple:

Analyze the technical physiology of modern proxies — their actual protocol behavior, UDP handling, DNS mechanics, leak potential, RFC compliance, and overall stability.

Huge thanks to everyone who shared access and samples. This dataset would not exist without your help.

Note: We did not evaluate IP cleanliness or blacklist status — only technical correctness.
And yes: all these checks are being integrated directly into ZloyRouter. It already detects real UDP support on the fly, with full metrics coming soon. No more blind purchases. No more silent leaks.

Why This Matters in 2025​

In today’s web environment — where Anti-Fraud (AF) systems are increasingly aggressive — having a “clean IP” is nowhere near enough.

Technical mismatches between your browser/emulator and the proxy — missing UDP, DNS leaks, inconsistent IPs across protocols — are among the strongest AF signals for detecting automation.

That’s why this research focuses on the features that matter most for stealth, reliability, and AF resistance.

Testing Criteria​

1. Full UDP Functionality​

We checked whether proxies support:

• STUN
• WebRTC
• QUIC

If you're emulating Chrome but your proxy silently drops UDP, you're practically telling the AF system you're a bot.

2. Proper DNS Handling (socks5h)​

DNS must resolve inside the tunnel, not on the client machine and definitely not via public DNS (e.g., 8.8.8.8).

Why this matters: Native provider DNS makes your traffic appear as if it originates within the proxy’s local network. This is top-tier camouflage for sensitive tasks.

3. IP Consistency Across Protocols​

UDP-returned IPs should match the TCP IP — or at least fall within the same ASN/subnet.
Mismatches are immediate AF red flags.

4. Correct Error Handling (RFC Compliance​

If the proxy doesn't support a protocol, it should return proper error codes — not silently drop packets.
Silent failures break killswitches and can leak real IPs.

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Results: Four Categories (A–D)​

These services delivered:​

• Full UDP stack (STUN/WebRTC/QUIC)
• Correct socks5h implementation
• Proper DNS tunneling
• No leaks
• Stable, predictable behavior

Nsocks.net — Leader in Stability & Predictability​

Outstanding consistency across all tests.

Strengths:

• Full UDP support on star-marked proxies
• RFC-compliant—no silent drops
• Extremely useful UDP support filter in the dashboard
• Strong performance class (Speed2_norm)
• Perfect socks5h with native DNS

Verdict: One of the safest and most predictable providers available today.

doppelganger.shop — Technically Superb, but Needs Caution​

High-speed, full-UDP proxies. But stability is the weak point.

Issue: Ports sometimes close silently instead of returning proper errors.

This is dangerous: killswitches may not trigger, risking real-IP exposure.

Verdict: Excellent tech, but handle with care.

Detect.expert — High Quality, High Price​

• T-Mobile mobile proxies: full UDP, very fast
• Other networks: inconsistent UDP availability
• No way to know UDP capability before payment

Verdict: Great if budget allows and variability is acceptable.

Proxy-Hub — Fast, Clean, Fully Functional​

• Full UDP support
• No leaks
• Consistently fast (Speed3_fast)

Verdict: Strong performance and no surprises.

Category B: Solid Middle Tier​

These services support socks5h and UDP-based DNS, but not full QUIC/STUN stacks.
Still suitable for many AF-sensitive situations.

922proxy.com​

• Missing full UDP
• socks5h behavior inconsistent across ports
• Extremely fast—often faster than Category A

Verdict: Great when speed matters more than full UDP.

Other reliable B-tier options:

• Betternever_findbot — socks5h + partial UDP DNS
• mobilehop.com
• nodemaven
• proxyempire.io

Good speed, stable, no critical flaws.

Characteristics:​

• No UDP
• No socks5h
• No DNS inheritance
• But no real-IP leaks
• Acceptable speeds

bigmama.market​

Mixed results:

• Some proxies behave properly
• Others return DNS from India while the IP is in the U.S.—an instant AF flag

Verdict: Use carefully and test individually.

These proxies suffered from one or more critical issues:

• DNS leaks
• Missing socks5h
• IP mismatches
• Very low speeds
• Unstable connections

Confirmed problematic services:

• simplynode.io
• elusive.sh
• my.mangoproxy.com
• proxyma.io
• lunaproxy.com

Verdict: Avoid for serious or AF-sensitive tasks.

My Personal Top-4 Recommendations (2025)​

For multi-accounting and AF-heavy workflows:

1. Nsocks — unmatched stability and transparent UDP filtering
2. Detect.expert — excellent on T-Mobile (but pricey and inconsistent elsewhere)
3. Proxy-Hub — fast, reliable, full UDP
4. Doppelganger — technically brilliant, but silent failures require caution

Everything else is either too inconsistent or suitable only for specific niche cases.