How to Find Cross Network in Google Analytics 4

Scrolling through your GA4 reports and seeing a significant amount of traffic from a source called "Cross Network" can be confusing. It’s not an obvious source like "Organic Search" or "Paid Social," and it often registers high session and conversion numbers. This article will explain exactly what Cross Network means, how to find it, and what you should do with the data.

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What is "Cross Network" Traffic in GA4?

Simply put, "Cross Network" is a channel in GA4 that bundles together traffic from automated Google Ads campaigns running across multiple Google properties. Think of it as Google's way of saying, "This user came from a Google Ads campaign, but it would be inaccurate to assign them to just Search or just YouTube, because the campaign is active across our whole advertising ecosystem."

This traffic typically comes from campaigns running on several platforms at once, like:

• Google Search Network
• Google Display Network
• YouTube
• Gmail
• Demand Gen (formerly Discovery)
• Google Shopping

Because the user's path might involve an interaction on YouTube, a search, and then a click from the Display network, GA4 can't attribute it to a single source/medium. Instead, it places it into the broader "Cross Network" bucket.

The Real Culprit: Performance Max (PMax) Campaigns

In almost all cases, the primary driver of "Cross Network" traffic is Performance Max (PMax) campaigns in Google Ads. PMax is an automated, goal-based campaign type that allows advertisers to access their entire Google Ads inventory from a single campaign.

Since PMax automatically finds customers across Search, YouTube, Display, and other channels to meet your conversion goals, its very nature is "cross-network." Consequently, when someone from a PMax campaign lands on your site, GA4 correctly attributes the session to this multi-channel campaign group.

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How to Find Cross-Network Traffic in GA4 Reports (Step-by-Step)

Finding and analyzing your Cross Network traffic is straightforward once you know where to look. The primary location is the Traffic Acquisition report.

Step 1: Navigate to the Traffic Acquisition Report

From your GA4 dashboard, go to the left-hand navigation panel and follow this path:

1. Click on Reports.
2. Under the "Life cycle" collection, expand the Acquisition section.
3. Click on Traffic acquisition.

This report shows you where your website visitors are coming from, typically grouped by the "Session default channel group."

Step 2: Locate "Cross Network" in the Report Table

Once the report loads, scroll down to the data table at the bottom of the page. You'll see a list of channels like Organic Search, Direct, Unassigned, etc. Look for a row labeled Cross-network.

Here you can immediately see key metrics:

• Users: The total number of unique users who started at least one session from this channel.
• Sessions: The total number of sessions initiated from Cross Network sources.
• Engaged sessions: Sessions that lasted longer than 10 seconds, had a conversion event, or had at least 2 pageviews.
• Conversions: The number of conversion events completed by users from this channel.

While this gives you a high-level view, it doesn't tell you which campaigns are driving this traffic.

Step 3: Drill Down with a Secondary Dimension

To gain actionable insights, you need to see a campaign-level breakdown. You can do this by adding a secondary dimension to your report.

1. In the Traffic acquisition report table, click the small blue plus sign (+) next to the primary dimension ("Session default channel group").
2. A menu will appear. In the search box, type "campaign."
3. Select Session campaign from the list under "Traffic source."

The table will now reload with a second column showing the names of your Google Ads campaigns. Find the "Cross-network" row and you’ll see your Performance Max campaigns listed right underneath it. This instantly connects the generic channel label to a specific, actionable campaign name from your Google Ads account.

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Bonus Method: Creating a Custom Pinpoint Report in Explore

If you find yourself analyzing Cross Network traffic frequently, you can build a more permanent and focused report in the "Explore" section of GA4.

1. Navigate to Explore in the left-hand navigation and select Free form.
2. Name your exploration: Give it a clear name like "PMax Campaign Performance."
3. Import Dimensions: In the "Variables" column on the left, click the plus sign next to "Dimensions." Search for and import "Session campaign" and "Session default channel group."
4. Import Metrics: Click the plus sign next to "Metrics." Search for and import metrics like "Sessions," "Engage sessions," "Engagement rate," and your key "Conversions" (e.g., purchase).
5. Build the Report:

You now have a clean, reusable report that shows only your Cross Network (PMax) campaigns and their core performance metrics, allowing you to quickly monitor their impact without the noise of other channels.

What to Do with Your Cross-Network Data

Just knowing where your Cross-network traffic comes from isn't enough. The goal is to turn this data into better marketing decisions. Here are a few actionable steps.

1. Confirm It's Your PMax Campaigns

Use the secondary dimension trick ("Session campaign") to verify that the traffic is indeed coming from your Performance Max campaigns. If you see campaign names that don't look like PMax campaigns, it might signal an issue with your GA4 and Google Ads integration. Double-check that you have auto-tagging enabled in your Google Ads account.

2. Evaluate Overall Performance

Look at the high-level metrics for the Cross-network channel. How does it compare to your other channels like "Paid Search" or "Paid Social"?

• Is the Engagement Rate higher or lower? A low engagement rate might indicate that the broad reach of PMax is attracting less relevant users.
• How about the Conversion Rate? (You can calculate this by dividing Conversions by Sessions). While PMax campaigns are designed to optimize for conversions, comparing its efficiency against other channels is good practice.

3. Analyze Individual Campaign Performance

This is where the real value lies. By segmenting by "Session campaign," you can differentiate between your various PMax initiatives.

For example, you might have one PMax campaign optimizing for "Add to Cart" and another focused directly on "Purchase." Comparing their traffic quality and eventual conversion numbers in GA4 can help you decide where to allocate your budget within Google Ads. It’s also a way to measure performance that isn't dependent only on the data inside of the Google Ads platform itself.

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4. Check Asset Group Performance in Google Ads

While GA4 groups everything at the campaign level, your real optimization levers for PMax are within the "Asset Groups" inside Google Ads. Once you've identified a top-performing or under-performing PMax campaign in GA4, head over to your Google Ads account. Dive into that specific campaign and analyze the performance of its Asset Groups to see which headlines, images, and audiences are driving performance.

Final Thoughts

The "Cross Network" channel in GA4 is not an error but a logical grouping for automated campaigns that span Google's vast ad inventory, driven primarily by Performance Max. By using the Traffic Acquisition report and adding "Session campaign" as a secondary dimension, you can easily link this generic traffic source directly to the specific advertising campaigns you're running.

Manually digging through reports is essential for understanding your data, but it can be a slow process. At Graphed, we remove this friction by connecting directly to your Google Analytics, Google Ads, Shopify, and other accounts. Instead of clicking through menus and adding secondary dimensions, you can simply ask a question like, "Compare my Performance Max campaign conversions against my Criteo campaigns last month" and instantly get a dashboard with the answer. We designed it for busy marketers and founders who need clear insights, not another complex tool to learn.