What Is Proxy IP Purity and Why Does It Matter?
Proxy IP purity measures how "clean" an IP address is — specifically, whether it has been previously used for spam, scraping abuse, fraud, or other violations. Purity directly impacts your experience on every platform: a "dirty" IP, even if it is a residential type, can result in account restrictions, frequent CAPTCHAs, or outright bans.
Think of it this way: IP type determines whether your "ID card" is genuine, while purity determines whether that ID card has a criminal record. You need both.
Problems Caused by Low-Purity IPs:
- TikTok: "Network environment abnormal" at registration, frequent verification during nurturing
- Amazon: Store linked to previously banned seller accounts
- Facebook: Ad account fails review, spending restricted
- ChatGPT/Claude: Access denied or frequent verification required
- Google: reCAPTCHA challenges on every search
The good news is that IP purity is testable. This guide covers 5 free detection tools and specific evaluation criteria to help you verify IP quality before purchasing and monitor IP status ongoing.
Tool 1: IPQualityScore (Most Comprehensive IP Risk Database)
URL: https://www.ipqualityscore.com/free-ip-lookup-proxy-vpn-test
IPQualityScore (IPQS) is one of the world's largest IP risk assessment platforms, used by countless websites and platforms for real-time fraud prevention decisions.
How to Test:
- Open the URL above and enter the IP address to check
- Click "Lookup"
- Review the key fields in the results
Key Metrics Explained:
| Field | Meaning | Ideal Standard |
|---|---|---|
| Fraud Score | Fraud risk rating (0-100) | <30 excellent, >75 high risk |
| Proxy | Identified as proxy | false is best |
| VPN | Identified as VPN | false is best |
| Tor | Tor exit node | false |
| Bot Status | Bot activity detected | false |
| Recent Abuse | Recent abuse history | false |
| ISP | Carrier name | Should be a known ISP |
| Connection Type | Connection classification | "Residential" is best |
Evaluation Criteria:
- Fraud Score <30 with no Proxy/VPN flags → High-quality IP, safe to use
- Fraud Score 30-60 → Some risk, cross-reference with other tools
- Fraud Score >60 → High-risk IP, not recommended for account operations
RESIP Test Results: We randomly tested 50 RESIP US residential IPs on IPQS. Average Fraud Score: 12. 100% classified as Residential connection type. 0% flagged as Proxy or VPN.
Tool 2: Scamalytics (Platform-Grade Anti-Fraud Detection)
URL: https://scamalytics.com/ip
Scamalytics is a UK-based anti-fraud analytics company whose IP scoring system is adopted by numerous e-commerce and financial platforms. Its scoring standards are stricter than IPQS.
How to Test:
- Visit the URL above
- Enter the IP address and click "Lookup"
- Review the overall risk score and individual components
Key Metrics Explained:
| Field | Meaning | Ideal Standard |
|---|---|---|
| Fraud Score | Overall fraud score (0-100) | <25 excellent |
| IP Type | IP classification | "isp" or "residential" |
| Risk Level | Risk tier | "very low" or "low" |
| Anonymizing VPN | VPN detection flag | "no" |
| Public Proxy | Public proxy flag | "no" |
Scamalytics Score Tiers:
- 0-25: Very low risk (green) — the ideal range
- 25-50: Low risk (yellow) — usable for most scenarios
- 50-75: Medium risk (orange) — platforms may increase scrutiny
- 75-100: High risk (red) — strongly not recommended
Pro Tip: Scamalytics is highly sensitive to IPs that have "ever been used as proxies." If an IP was previously in a shared proxy pool used by many people, even if only you are using it now, the historical record still inflates the score. This is why dedicated IPs matter — RESIP IPs are dedicated from onboarding, preventing historical contamination.
RESIP Test Results: The same batch of 50 IPs averaged 8 on Scamalytics, with a maximum of 22. 100% fell in the "very low risk" range. 100% identified as "isp" type.
Tool 3: IP2Location (Geolocation and Proxy Detection Authority)
URL: https://www.ip2location.com/demo
IP2Location is a leading authority in geolocation databases and also provides proxy detection services. Many platforms use IP2Location's data behind the scenes to assess IP quality.
How to Test:
- Visit the IP2Location demo page
- Enter the IP address to query
- Switch to the "Proxy Detection" tab to view results
Key Metrics Explained:
| Field | Meaning | Ideal Standard |
|---|---|---|
| Proxy Type | Proxy classification | "-" (no proxy flag) is best |
| Usage Type | Usage classification | "ISP/MOB" or "ISP" |
| Threat | Threat flag | "-" (no threat) |
| Country/City | Geographic location | Matches expectations |
| ISP | Carrier | Known ISP |
| Domain | Domain | Points to ISP domain |
Usage Type Breakdown:
- ISP: IP assigned by Internet Service Provider → Best
- ISP/MOB: ISP or mobile carrier IP → Excellent
- COM: Commercial use IP → Acceptable
- DCH: Datacenter/hosting → Avoid for account operations
- SES: Search engine spider → Avoid
IP2Location's Special Value: Its geolocation data is among the most accurate in the industry. Use it to verify whether an IP's actual location matches your expectations. If you purchased a California IP but IP2Location shows New York, the IP information may be inaccurate.
RESIP Test Results: All 50 test IPs were classified as "ISP" type, 0% showed proxy or threat flags, and geographic location matched the selected region 100% of the time.
Tool 4: whoer.net (Comprehensive Environment Consistency Check)
URL: https://whoer.net
What makes whoer.net special is that it tests not just the IP itself, but your entire network environment for consistency — exactly mirroring how platform risk engines operate.
How to Test:
- Connect to your proxy, then visit whoer.net in your browser
- The page automatically begins a comprehensive check
- Review the anonymity score and individual details
Key Metrics Explained:
| Check Item | Meaning | Ideal Standard |
|---|---|---|
| Anonymity Score | Overall anonymity rating | ≥70% passing |
| IP Address | IP consistency | Shows proxy IP |
| DNS | DNS leak check | DNS region matches IP |
| WebRTC | WebRTC IP leak | No leak |
| Timezone | Timezone consistency | Matches IP region |
| Language | Browser language | Matches IP region |
| Geolocation | Geolocation API | Matches IP or disabled |
Common Issues and Fixes:
- DNS Leak: Browser DNS requests bypass the proxy, exposing your real location
- Fix: Enable remote DNS resolution with SOCKS5 proxies; or manually set DNS to a public DNS in the target region
- WebRTC Leak: Browser WebRTC reveals your real IP
- Fix: Install a WebRTC leak prevention extension (e.g., WebRTC Leak Prevent), or disable WebRTC in browser settings
- Timezone Mismatch: System timezone does not match IP region
- Fix: Set your operating system timezone to match the IP's location
Important Note: whoer.net scores reflect your overall environment security, not just IP quality. Even with a perfectly clean IP, DNS leaks or wrong timezone settings will still reveal proxy usage. So beyond choosing good IPs, you must also configure your environment properly.
Tool 5: BrowserLeaks (Deep Browser Fingerprint Detection)
URL: https://browserleaks.com
BrowserLeaks provides the most comprehensive browser fingerprint testing, covering IP, WebRTC, Canvas, WebGL, fonts, and over a dozen other checks. It is especially important for multi-account operations requiring strong anti-association.
Core Test Pages:
- IP Address (https://browserleaks.com/ip)
- Tests IP geolocation, ASN, and ISP information
- Shows whether proxy/VPN/Tor is detected
- Checks for X-Forwarded-For and other proxy header leaks
- WebRTC Leak Test (https://browserleaks.com/webrtc)
- Detects whether WebRTC leaks public or private IPs
- Shows STUN/TURN server detection results
- This is the most commonly overlooked leak vector
- DNS Leak Test (https://browserleaks.com/dns)
- Tests whether DNS requests route through the proxy tunnel
- Shows actual DNS servers being used
- DNS leaks are the second most common leak after WebRTC
Comprehensive Testing Checklist:
| Test Item | Tool | Pass Criteria |
|---|---|---|
| IP Type | IPQualityScore | Residential, Fraud Score <30 |
| IP Purity | Scamalytics | Score <25 |
| IP Geolocation | IP2Location | Matches expectations |
| DNS Leak | BrowserLeaks/whoer | No leak |
| WebRTC Leak | BrowserLeaks/whoer | No leak |
| Environment Consistency | whoer.net | Score ≥70% |
| Blacklist | IPQualityScore | No Recent Abuse |
Recommended Testing Workflow:
- First test IP quality with Scamalytics and IPQS (2 minutes)
- Connect to proxy and run whoer.net for environment check (1 minute)
- If issues found, deep-dive with BrowserLeaks (5 minutes)
- Periodically (monthly) retest IP purity to ensure no contamination
RESIP users typically pass all checks at step 1 — because we complete this entire testing workflow before onboarding any IP. Your main focus should be steps 2 and 3: environment configuration.
Frequently Asked Questions (FAQ)
Q: The test shows my IP as "proxy" but I bought a residential IP. What happened? A: Some residential IPs that were previously in shared proxy pools retain proxy flags in detection databases due to heavy prior use. This is why choosing a clean, dedicated IP source matters. RESIP IPs undergo strict screening before onboarding, preventing this issue.
Q: Different tools show different results. Which one should I trust? A: We recommend prioritizing Scamalytics and IPQualityScore as primary references, since these two databases are adopted by the most platforms. If both show low risk, minor flags from other tools typically do not affect usability.
Q: How often should I test IP purity? A: Always test when purchasing a new IP. After that, monthly testing is recommended. If you notice platforms increasingly showing CAPTCHAs or throttling, test IP status immediately.
Q: Can IP purity degrade over time? A: With a dedicated IP and normal usage behavior, purity will not degrade. However, with shared IPs, other users' violations can contaminate the IP. This is precisely why RESIP maintains a dedicated-use model.
Q: Are the free testing tool results reliable? A: All 5 tools covered in this guide are industry authorities, and their free query results match the data returned by paid APIs. However, free queries usually have rate limits — bulk testing requires paid API access.
Q: Do I still need to test RESIP IPs myself? A: RESIP runs comprehensive testing before every IP goes live, but we still recommend users verify independently. It confirms the IP is working correctly and — more importantly — validates that your own environment configuration (DNS, WebRTC, timezone, etc.) is properly set up.