The 580×400 Netboard is a massive rectangular ad unit that typically appears in the middle of content articles. It is widely used in Northern Europe (especially Norway and Sweden) and is known for having incredibly high click-through rates (CTR).
Because it is significantly larger than the standard 300×250 rectangle, it commands attention without being as intrusive as a pop-up. If you are targeting Scandinavian markets, this size is mandatory.
Why Use the 580×400?
1. High Impact
This unit is often called a “sticky” ad because it stays in view while the user scrolls through a long article. Its large vertical height (400px) ensures it remains visible for a long duration.
2. Rich Media Friendly
The dimensions are perfect for short video loops or interactive HTML5 games that require more width than a standard sidebar ad allows.
Conclusion
While not a standard US size, the Netboard is a powerhouse in international markets. It bridges the gap between a standard banner and a full-screen interstitial.