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Data-Centre Proxies
Traffic routed through cloud hosting providers and server farms. Fast and cheap, but easier to detect because the IP ranges belong to known data centres rather than ISPs.
Fraud Type Guide
Proxy Traffic: How Masked Connections Enable Ad Fraud
Proxies let fraudsters hide their true location, rotate through thousands of IP addresses, and bypass every geographic and frequency-based protection you have in place.
What Is Proxy Traffic?
Quick answer: Proxy traffic routes through intermediary servers that mask the true IP address, location, and identity of the user — enabling fraudsters to evade geographic targeting and IP-based blocking.
A proxy server acts as an intermediary between a user (or bot) and the destination website. Instead of connecting directly, the traffic passes through the proxy first, which replaces the original IP address with its own. The destination server sees the proxy’s IP, not the true source.
In the context of ad fraud, proxies serve a critical purpose: they allow fraudsters to disguise the origin of their traffic. A bot operating from a data centre in Eastern Europe can appear to be a residential user in New York, bypassing geographic targeting rules and evading IP-based detection.
Modern proxy services have become sophisticated and accessible. Residential proxy networks route traffic through millions of real consumer devices, making it extremely difficult to distinguish proxy traffic from genuine users based on IP alone. This is why multi-signal detection — combining IP intelligence with device fingerprinting and behavioural analysis — is essential.
Types of Proxies Used in Ad Fraud
Fraudsters choose different proxy types depending on the level of sophistication needed to evade detection.
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Residential Proxies
Traffic routed through real consumer IP addresses, often via SDK-installed software on real devices. Much harder to detect because the IPs belong to legitimate ISPs and residential networks.
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Mobile Proxies
Traffic routed through mobile carrier IP addresses. These are particularly difficult to detect because mobile carriers use shared IP pools, meaning blocking one IP could affect legitimate users.
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Rotating Proxies
Services that automatically cycle through thousands or millions of IP addresses, assigning a new IP for each request. This defeats rate-limiting and IP-based frequency caps.
How Proxy Traffic Undermines Your Campaigns
Proxy traffic doesn’t just waste budget — it systematically degrades the targeting and optimisation infrastructure your campaigns depend on.
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Broken Geo-Targeting
When bots use proxies to appear in your target geography, you pay for impressions and clicks from locations where you have no real audience. Your geo-performance data becomes unreliable.
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Defeated Frequency Caps
Rotating proxies assign new IPs per request, making a single bot look like thousands of unique users. Frequency caps that limit ad exposure per IP become completely ineffective.
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Corrupted Analytics
Proxy traffic fills your analytics with fake location data, inflated unique visitor counts, and misleading engagement metrics. Decisions based on this data compound the damage.
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Evaded IP Blocking
Even if you identify and block a fraudulent IP, rotating proxy services ensure the bot simply re-emerges from a different address within seconds.
Opticks integrates via a lightweight tag — install through Google Tag Manager in under five minutes with no code changes required.
How Opticks Detects Proxy Traffic
IP Intelligence
Opticks maintains real-time databases of known proxy, VPN, and data-centre IP ranges — catching the obvious proxy traffic that list-based methods can identify.
Network Fingerprinting
Beyond IP classification, Opticks analyses network-level signals like latency patterns, connection characteristics, and protocol behaviour that reveal proxy usage even from residential IPs.
Cross-Signal Correlation
By combining IP intelligence with device fingerprinting and behavioural analysis, Opticks detects proxy traffic that would evade any single detection method alone.
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