Ads Getting Through Your Ad Blocker? Here's What I Think

I recently came across a discussion online that really resonated with me. Someone was expressing frustration about ads slipping through their ad blockers, even with multiple extensions installed. They were seeing ads from a specific crypto platform and other sources, despite usually having a tight ad-free experience. This got me thinking about the ever-evolving cat-and-mouse game between ad blockers and advertisers, and what users can do to stay ahead.

Let's explore why this happens and what steps you can take to bolster your ad-blocking setup.

Why Are Ads Still Getting Through?

Several factors can contribute to ads bypassing your ad blockers. It's rarely a simple case of the ad blocker failing entirely. Here's a breakdown:

1. Evolving Ad Technology

Advertisers are constantly developing new techniques to circumvent ad blockers. This includes:

• Cloaking: Serving ads that appear to be regular content.
• Obfuscation: Hiding the ad code to make it harder for blockers to identify.
• Native Advertising: Ads designed to blend seamlessly with the website's content.
• Anti-Adblock Scripts: Websites detecting ad blockers and refusing content or displaying alternative ads.

Ad blockers need to constantly update their filters and detection methods to keep up with these changes. If your ad blocker hasn't updated recently, it may be missing the latest techniques.

2. Filter List Staleness

Ad blockers rely on filter lists, which are essentially databases of known ad servers, domains, and tracking scripts. These lists need to be updated regularly to remain effective. If your filter lists are outdated, new or less common ads can slip through the cracks.

3. Whitelisting and Exceptions

Many ad blockers allow you to whitelist specific websites, either intentionally or unintentionally. This can happen if you've accidentally clicked a "Don't block on this site" button or if a website is automatically whitelisted due to a subscription or other agreement. Even if you haven't explicitly whitelisted a site, some ad blockers have default whitelists that might be letting ads through.

4. Multiple Ad Blockers Conflicting

It might seem counterintuitive, but running multiple ad blockers simultaneously can actually reduce their effectiveness. This is because they can interfere with each other, causing conflicts that prevent either one from working properly. Also, using too many extensions can slow down your browser.

5. DNS Cache Issues

Sometimes, your device's DNS cache can store outdated information about ad servers. This can cause ads to load even if your ad blocker is properly configured to block them. Flushing your DNS cache can resolve this issue.

6. Specific Ad Types

Some types of ads are notoriously difficult to block. For example, YouTube ads are often served from the same domain as the video content itself, making it challenging for DNS-based blockers to distinguish between the two. In-app ads can also be tricky to block, especially if they're integrated deeply into the app's code.

7. HTTPS and Encrypted Traffic

With the widespread adoption of HTTPS, much of the web traffic is now encrypted. This makes it more difficult for ad blockers to inspect the content and identify ads. While most ad blockers can handle HTTPS traffic, it does add a layer of complexity that can sometimes lead to ads slipping through.

Troubleshooting Ads Getting Through

If you're experiencing ads despite having an ad blocker installed, here's a systematic approach to troubleshooting the issue:

1. Update Your Ad Blocker and Filter Lists

This is the first and most important step. Make sure your ad blocker is running the latest version and that your filter lists are up-to-date. Most ad blockers have an option to manually update filter lists in their settings.

2. Review Your Whitelist

Carefully examine your ad blocker's whitelist to ensure that no unintended websites are being allowed to show ads. Remove any sites that you don't want to whitelist.

3. Disable Other Extensions

Try disabling all other browser extensions except for your ad blocker. This will help you determine if another extension is interfering with its operation. If the ads disappear after disabling other extensions, you can re-enable them one by one to identify the culprit.

4. Clear Your Browser Cache and Cookies

Clearing your browser's cache and cookies can sometimes resolve issues caused by outdated or corrupted data. Be aware that this will also log you out of websites and remove saved preferences.

5. Flush Your DNS Cache

Flushing your DNS cache can remove outdated information about ad servers. The process for flushing your DNS cache varies depending on your operating system:

• Windows: Open Command Prompt and run the command ipconfig /flushdns
• macOS: Open Terminal and run the command sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
• Android: Restart your device.
• iOS: Reset network settings (Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings)

6. Test with a Different Browser or Device

To rule out browser-specific issues, try browsing the same websites on a different browser or device. If the ads are still getting through, the problem is likely with your ad blocker configuration or filter lists.

7. Try a Different Ad Blocker

If you've tried all of the above steps and are still seeing ads, consider switching to a different ad blocker. Different ad blockers use different detection methods and filter lists, so one might be more effective than another in your particular situation.

8. Consider DNS-Based Ad Blocking

As we often recommend, DNS-based ad blocking can provide a system-wide solution that works across all apps and browsers on your device. This approach can be particularly effective for blocking ads that bypass browser-based ad blockers. Services like NextDNS and AdGuard DNS offer customizable DNS servers that block ads and trackers at the network level.

9. Investigate Specific Ads

If you notice ads from a particular source getting through consistently, try to identify the ad server or domain that's serving the ads. You can then add this domain to your ad blocker's custom filter list. This is an advanced technique, but it can be very effective for blocking persistent ads.

10. Report the Issue

Most ad blocker developers have a mechanism for reporting ads that are not being blocked. This helps them improve their filter lists and detection methods. If you encounter an ad that's slipping through, take the time to report it to your ad blocker's developers.

The Ad Blocking Arms Race

The reality is that ad blocking is an ongoing arms race. Advertisers are constantly developing new ways to circumvent ad blockers, and ad blocker developers are constantly working to stay one step ahead. There's no guarantee that any ad blocker will be 100% effective all the time. However, by following the troubleshooting steps outlined above and staying informed about the latest ad blocking techniques, you can significantly reduce the number of ads you see and enjoy a cleaner, more private browsing experience.

My Recommended Ad Blocking Setup

Based on my experience and the challenges we've discussed, here's my recommended ad blocking setup for mobile users:

1. DNS-Based Blocking (Primary)

As always, I recommend starting with DNS-based ad blocking. It provides system-wide protection and is relatively easy to set up. My top pick remains NextDNS for its customizability and detailed analytics. AdGuard DNS is a great alternative for those who prefer a simpler, more hands-off approach. Configure this on your phone's network settings for comprehensive protection.

2. Browser-Based Ad Blocker (Secondary)

In addition to DNS-based blocking, I recommend using a browser-based ad blocker for extra protection. AdGuard for Safari (on iOS) or uBlock Origin (on Android using Firefox) are excellent choices. These extensions can block ads that DNS-based blockers might miss, such as those served from the same domain as the content itself.

3. Periodic Review and Updates

Regularly review your ad blocker's settings, update your filter lists, and clear your browser cache and cookies. This will help ensure that your ad blocking setup remains effective over time.

4. Be Aware of Limitations

Understand that no ad blocker is perfect. Some ads may still slip through, and you may need to adjust your setup or try different solutions to block them. Be patient and persistent, and don't be afraid to experiment.

5. Consider a Content Blocker (iOS)

On iOS, consider using a content blocker app like 1Blocker in Safari. These apps offer fine-grained control over what gets blocked, allowing you to customize your browsing experience to your liking.

The Importance of Privacy

While blocking ads can improve your browsing experience and save you data, it's also important to consider the privacy implications of ad tracking. Many ads are served by tracking networks that collect data about your browsing habits and use it to target you with personalized ads. By blocking these ads, you can also protect your privacy and prevent these networks from tracking you.

Ultimately, the best ad blocking setup is the one that works best for you. Experiment with different solutions, stay informed about the latest techniques, and don't be afraid to adjust your setup as needed. With a little effort, you can significantly reduce the number of ads you see and enjoy a cleaner, more private browsing experience on your mobile device.