Invalid Traffic Types TrafficGuard Detects and Blocks in Real Time (2026)

TrafficGuard detects and blocks 15+ distinct types of invalid traffic in real time, spanning both general invalid traffic (the predictable noise like crawlers and accidental clicks) and sophisticated invalid traffic (engineered fraud like ad injection, click spam and user-agent spoofing). This page is the catalogue of exactly what gets stopped. For the definition and background of invalid traffic itself, start with our complete IVT guide.

Invalid traffic quietly drains ad budgets and corrupts the data your campaigns optimise against. The question for advertisers is not just what invalid traffic is, but exactly what a prevention platform actually catches. This blog is the answer: every type of invalid traffic TrafficGuard detects and blocks, in real time, before it reaches your campaigns.

If you want the background first, our complete blog guide to invalid traffic (IVT) covers what it is and why it matters. Otherwise, the catalogue below shows what dedicated click fraud protection removes from your traffic, grouped into general and sophisticated invalid traffic. Wasted opportunity cost is the headline danger, one TrafficGuard customer was losing 36.2% of ad spend to invalid sources, but IVT also compromises the quality of the data you optimise with.

General Invalid Traffic (GIVT)

General invalid traffic is generated by non-malicious activity, such as existing customers clicking ads to reach a sign-in page, or web crawlers. It is the most common type of IVT, and it still affects your budget.

Accidental clicks

Unintentional clicks, for example a finger slipping while scrolling, where the user lands and immediately leaves. A high bounce rate is a strong indicator.

Clicks from existing customers

Common for businesses with a customer portal or log-in. Existing customers navigate to your site via paid ads, so you pay for clicks from people who already buy from you anyway.

Known data-centre traffic

Traffic identified by IP address as originating in a data centre, likely from a server rather than a real device. High volumes from a single location, or from VPNs and anonymous proxies, are good indicators.

Sophisticated Invalid Traffic (SIVT)

Sophisticated invalid traffic is more technical and harder to catch, usually requiring advanced analytics to identify, analyse and prevent.

Ad injection

Inserting ads on a publisher's site without consent, often via a user-installed browser extension, plugin or app. It blocks content, can carry malware and obscures the site's own advertising.

Ad stacking

Layering multiple ads in one slot so only the top is visible. When the user clicks, they unknowingly click every stacked ad. Multiple simultaneous clicks from one user are the biggest indicator.

App install farms

Banks of physical devices that spam-click ads, install apps and open them to trigger install events, sometimes resetting the device ID so each install looks like a new user. High install volumes from one location or single IPs are tell-tale signs. See our guide to bot farms.

Auto-refresh

Ad slots refreshed at short intervals to log more impressions per page view. Under a CPM model, advertisers pay for impressions on ads that were never viewable or shown long enough to register.

Bots

A broad term covering automated programs that emulate human behaviour, from clicking and viewing ads to watching videos, installing apps and adding products to carts. See bot traffic for the full picture.

Click injection

An app on the user's device listens for install broadcasts and fires a click just before installation completes, stealing credit. An impossibly short click-to-install time gives it away, and anything outside the normal distribution is flagged.

Click spam

A large volume of fake clicks on a mobile device the user never made. If that user later installs the app, the spammer is credited and paid commission, so the install is misattributed and invalid. Read more about click spam here.

Compliance fraud

Traffic sourced outside the advertiser's target audience or via prohibited means, for example sending tier-3 traffic to a tier-1 campaign. Unusually high VPN or anonymous-proxy volumes from a single supply source are red flags, and TrafficGuard blocks them automatically.

Cookie stuffing

An affiliate-fraud tactic that secretly attaches third-party cookies so an unrelated actor is credited for a conversion. See our deep dive on cookie stuffing.

Domain spoofing

Manipulating domain data so low-quality traffic appears to come from premium publishers, letting fraudsters sell junk inventory at a premium. See domain spoofing.

Location fraud

Manipulating users' location data to match an advertiser's geo-targeting, presenting low-CPM traffic as high-CPM to illicitly obtain the higher rate.

Pixel stuffing

Condensing one or more standard ads into a 1x1 pixel frame so impressions are triggered without the ad being visible, generating impressions from more ads than a page could genuinely hold.

Retargeting fraud

Fabricating engagement in higher-CPM retargeting campaigns, either by faking clicks to claim credit when a user re-engages, or by using bots that mimic high-value behaviour to be added to retargeting lists.

Sophisticated bot-driven installs

Background install bots inside seemingly legitimate apps that download, open and interact with apps without the user's awareness, producing genuine-looking but valueless installs. TrafficGuard monitors post-install events per source to detect the programmed patterns.

User-agent spoofing

Altering the user-agent string to disguise traffic, for example making one device look like many, or presenting desktop traffic as mobile to pass targeting criteria.

The Bottom Line

These are the types of invalid traffic TrafficGuard detects and blocks in real time, across both the everyday noise of GIVT and the engineered fraud of SIVT, before they reach your campaigns or corrupt your data. The result is cleaner spend, cleaner signals and decisions you can trust. See how much invalid traffic is in your campaigns with our IVT calculator or sign up for a free trial withTrafficGuard to detect invalid traffic in your ad campaigns.

FAQs

1. How many types of invalid traffic does TrafficGuard block?

TrafficGuard detects and blocks 15+ distinct types of invalid traffic, spanning both general invalid traffic (GIVT) such as crawlers, accidental clicks and data-centre traffic, and sophisticated invalid traffic (SIVT) such as ad injection, click spam, domain spoofing and user-agent spoofing.

2. What is the difference between GIVT and SIVT?

GIVT is non-malicious, predictable invalid traffic that is relatively easy to filter, like bots, crawlers and accidental clicks. SIVT is deliberately engineered to evade detection, including app install farms, click injection and bot-driven installs, and requires advanced behavioural analysis to catch.

3. Does Google Ads not already filter invalid traffic?

Google filters some invalid traffic, mostly GIVT, and may issue limited credits after the fact. Sophisticated invalid traffic is designed to bypass these filters, so a portion still reaches campaigns. Independent, real-time prevention closes that gap.

4. How does TrafficGuard block invalid traffic in real time?

TrafficGuard analyses each click and impression against behavioural, environmental and technical signals, click velocity, device fingerprints, IP intelligence and engagement patterns, and blocks invalid interactions before they are charged or fed into optimisation algorithms.

5. Is all invalid traffic fraudulent?

No. General invalid traffic such as accidental clicks or returning customers is not malicious, but it still wastes spend. Sophisticated invalid traffic is deliberate fraud. TrafficGuard addresses both because both damage budget and data quality.

6. What is the most damaging type of invalid traffic for advertisers?

It varies by channel, but sophisticated tactics like click injection, app install farms and bot-driven installs are especially damaging because they misattribute conversions and corrupt the optimisation signals that drive automated bidding.

7. How much ad spend can invalid traffic waste?

It varies, but exposure commonly runs from 10% to 40% of traffic depending on channel, and one TrafficGuard customer was losing 36.2% of spend to invalid sources. Measuring your own exposure is the first step.

8. How do I find out how much invalid traffic is in my campaigns?

Use the TrafficGuard IVT calculator for a fast estimate, or start a free trial to see a real breakdown of the invalid traffic types reaching your campaigns and how much budget they are consuming.