Multicast vs Unicast in 2025: How to Make the Shift Using the Right CDN

In the world of video streaming, the method used to deliver content to end-users is just as important as the content itself. For years, multicast has been a reliable way to send video to many users at once. But today’s streaming audiences demand personalization, high quality, and low latency, and that’s where unicast delivery through a modern CDN becomes essential.

In this blog, we’ll explore the difference between multicast and unicast, why unicast is now the preferred delivery method for OTT platforms, and how using the right Content Delivery Network (CDN) makes all the difference.

Multicast is a network delivery method where one stream of data is sent from the server and shared by many users simultaneously. It’s efficient for large-scale broadcasting, such as IPTV or internal enterprise networks, where users watch the same stream at the same time.

Because it sends data only once across the network and shares it with multiple devices, multicast uses less bandwidth and reduces server load.

However, multicast has serious limitations in today’s OTT and internet-based environments:

• It doesn’t support on-demand content well

• It requires special network infrastructure (not supported by most ISPs)

• It’s difficult to implement personalization like ads or language selection

• It cannot scale globally without complex setups

Unicast sends a separate stream to each viewer. This allows platforms to deliver personalized content based on the viewer’s location, device, bandwidth, and preferences. It works seamlessly across the public internet and is ideal for modern OTT and live video use cases.

With unicast:

• Each viewer gets a customized stream

• Content can be paused, skipped, or restarted anytime

• Ad targeting and DRM can be applied per user

• It works with all CDNs and standard HTTP protocols

The trade-off is that unicast uses more bandwidth since every viewer receives an individual stream. But with the right CDN, this challenge is easily managed.

Here’s how the industry has changed over the last 5 years:

As shown, the use of unicast is now dominant. This is largely due to the global shift towards mobile, on-demand, and multi-device viewing, where multicast simply can't keep up.

The chart above clearly shows how unicast streaming is growing rapidly, overtaking multicast by a wide margin in just five years. This shift is powered by user demand for higher-quality video, interactive features, and on-demand access.

A CDN (Content Delivery Network) is a system of distributed servers that deliver video content to users based on their location. In unicast streaming, where every viewer gets a unique stream, the CDN plays a critical role in reducing buffering, improving quality, and scaling efficiently.

Here’s how the right CDN helps:

A CDN places content on edge servers close to the user, which reduces latency and buffering. For unicast, where many users request different content simultaneously, this local delivery is crucial.

Leading platforms like Vodlix use multi-CDN delivery, which means your content can switch between different CDNs automatically based on performance and location. This improves speed, reduces failure points, and ensures high availability.

A smart CDN can handle adaptive bitrate streaming, meaning it can switch video quality up or down in real-time based on the user’s internet connection. This is only possible in unicast, where every stream is customized.

Unicast allows content encryption and Digital Rights Management (DRM) to be applied per user. A good CDN supports secure key exchange, token-based authentication, and geo-blocking for compliance.

CDNs that support unicast can deliver dynamic content—such as targeted ads or different subtitles—to different users. This helps increase monetization and viewer satisfaction.

Vodlix is a white-label OTT platform designed for the modern unicast world. It provides:

• End-to-end unicast support for live and on-demand content

• Built-in multi-CDN delivery to reduce buffering

• Adaptive bitrate streaming for smooth playback

• DRM protection and content licensing tools

• Support for personalized ad delivery and viewer analytics

• Seamless playback across web, mobile, smart TVs, and apps

Whether you're running a movie platform, news network, or eLearning service, Vodlix gives you full control over how your content is delivered, viewed, and monetized.

If your platform still relies on multicast or has limitations due to legacy infrastructure, 2025 is the perfect time to transition.

You should move to unicast if:

• You plan to expand globally

• You need to serve content across multiple devices

• You want to offer features like ads, personalization, and DRM

• You aim to improve viewer experience with faster delivery

• You want accurate analytics for decision-making

Making the shift today can help future-proof your platform and grow your audience reach without tech barriers.

The streaming world has evolved. From the shared streams of multicast to the personalized, scalable delivery of unicast—the industry standard has changed. Unicast allows for greater control, higher quality, and unmatched flexibility. But none of this works without a powerful, CDN-backed infrastructure.

Choosing the right CDN is not just about speed—it's about security, scalability, and long-term success.

With Vodlix, you don’t just make the shift—you lead it. From advanced CDN integration to full unicast support, Vodlix gives you everything you need to deliver professional, secure, and personalized video content across the globe.

Let Vodlix help you make the transition from multicast to a fully optimized unicast streaming platform—fast, simple, and scalable.