Traffic always takes the fastest line
Combine multiple lines and nodes, and route each user to the fastest path by location; if any line fails, it switches over automatically, at a fraction of the cost of building your own multi-CDN.
Layers onto any mix of Hong Kong, China, or Overseas CDN, with multi-line routing, failover, and unified monitoring built in.
Pick a plan by target user region. Every plan includes free SSL, WAF, and DDoS protection, priced in HKD, billed after use.
Smart CDN is an add-on to your CDN. It keeps multiple lines and nodes running, picks the best path by user location and live network conditions, and switches over automatically if any line fails.
It is not a standalone CDN. It layers onto any Hong Kong, China, or Overseas CDN (one or combined), upgrading a single line into smart multi-line routing.
You integrate multiple vendors yourself, building DNS failover, billing consolidation, and monitoring tools. High technical and operating cost.
UD handles multi-line routing, failover, unified monitoring, and billing in-house. No integration work on your side, for an add-on of HK$20/month.
No change to your domain, servers, or app architecture, and the whole setup fits within one business day.
In the UD CDN console, keep or add any Hong Kong, China, or Overseas CDN plan (one or combined) as the line pool for smart routing.
Add the Smart CDN add-on to an existing CDN domain; it goes live instantly at HK$20/month and inherits all your current settings.
The system detects each line's latency and health in real time, picks the best path for every user, and switches over in milliseconds on failure.
Works the moment you enable it: routing, failover, custom rules, monitoring, security, and support built in, no extra integration.
The system tracks each line’s latency and health in real time: it picks the fastest line by user location and switches to the next if any fails.
Start free trial →Line status, hit rate, and traffic split all in one console, no juggling multiple dashboards.
Automatically hides the origin address, with free SSL, WAF, and DDoS protection built in.
24/7 email, phone and live chat, with a real person responding when a line fails.
For custom split rules, enterprise multi-CDN integration, or deploying a multi-region line pool, fill in the form and our Hong Kong team will follow up shortly.
Still have questions? Reach our Hong Kong engineering team directly.
A traditional multi-CDN means integrating several vendors yourself, building DNS failover, billing consolidation, and monitoring tools, at high technical and cost barriers. Smart CDN handles multi-line routing and failover inside UD, runs automatically on enable, and costs an HK$20/month add-on.
The system tracks the latency, hit rate, and availability of each line in real time, computing the best path by user region, time of day, ASN, and more. It all happens in the background; users just get fast, stable responses.
If any line fails or an upstream provider drops, traffic is redirected to the next available line. The switch completes in milliseconds, with a 99.99% uptime commitment.
Smart CDN is an add-on, so you need one or more base regional CDNs first. Choose any mix: Hong Kong + China, Hong Kong + Overseas, or all three. The more lines you run, the more room Smart CDN has to route.
Smart CDN itself is an HK$20/month per-domain add-on; base CDN traffic is billed by the pay-as-you-go or monthly plan of your chosen region. All prices are in HKD, billed after use.
Yes. Advanced users can define split rules by region, time, user attributes, and traffic type. For example, route Mainland users 100% over CN2 GIA, spread overseas users across multiple nodes, or prioritise low-latency lines during office hours.
Smart CDN is a line-layer routing service that applies to dynamic content (API / WebSocket), video (live / on-demand), and ordinary static pages alike. All can run together without conflict.
Log in to the UD CDN console, enable the Smart CDN add-on on an existing CDN domain, and it instantly inherits your settings and starts multi-line routing. No change to your domain, servers, or app architecture.