What Is Art-Net? Carrying DMX Over a Network
Art-Net carries DMX data over an Ethernet network. Instead of pulling a separate DMX cable for every universe, you send the data down a network cable and control far more fixtures and universes than copper alone would allow. It was developed by Artistic Licence and has become one of the two standard ways to move lighting data across a network.
In short
- Art-Net carries DMX data over Ethernet using UDP on port 6454.
- Art-Net 4 addresses up to 32,768 universes.
- A node converts the network data back into physical DMX outputs.
- ArtPoll discovers devices automatically — sACN has no equivalent.
- It replaces the long haul, not the fixture connection; fixtures still speak DMX.
- Network design decides reliability: separate VLAN, managed switches, no Wi-Fi.
Why use Art-Net?
A single DMX universe stops at 512 channels. With modern multi-channel LED fixtures and pixel work, that limit arrives quickly. Art-Net solves several problems at once:
- Many universes on one cable. A single network link carries data that would otherwise need dozens of separate DMX runs.
- Distance. Ethernet reaches further and is easier to extend with switches and fibre than a copper DMX bus.
- Flexible topology. Nodes can sit anywhere on the network, converting data to short local DMX lines.
- Existing infrastructure. In buildings with structured cabling already in place, no new lighting-specific cable is needed.
How Art-Net works
Art-Net packages DMX data into UDP packets and sends them across an IP network on port 6454. Traditionally it uses broadcast, so every device on the network receives every packet; Art-Net 4 also supports unicast, which reduces the load considerably on large systems.
At the other end, an Art-Net node receives the packets and converts the universes it is configured for back into physical DMX outputs. A typical node has two, four or eight XLR outputs.
Art-Net also includes a discovery mechanism, ArtPoll, which lets a controller find nodes on the network automatically and read their configuration — something sACN does not provide.
How many universes?
Art-Net 4 addresses up to 32,768 universes, organised as networks, subnets and universes. In practice the limit you meet first is not the protocol but the network: bandwidth, switch capacity and node performance decide how much you can really run.
Art-Net compared with plain DMX
| DMX512 | Art-Net | |
|---|---|---|
| Medium | 120 Ω twisted pair, XLR | Ethernet, RJ45 |
| Capacity | 512 channels per cable | Thousands of universes per link |
| Topology | Daisy chain only | Standard network topology |
| Device discovery | None | ArtPoll |
| Distance | ~300 m per segment | Network distances, extendable with fibre |
| Where it ends up | Directly at the fixture | At a node, then DMX to the fixture |
Note the last row: Art-Net does not replace DMX at the fixture. Almost every fixture still speaks DMX. Art-Net replaces the long haul, and a node converts back to DMX for the final short run.
When to use Art-Net
- More than two or three universes
- Fixtures spread across a large site or several floors
- Pixel work, where universes are consumed rapidly
- Installations where structured cabling already exists
- Systems built around a media server or lighting software on a computer
The network matters more than the protocol
Keep lighting traffic on its own network or VLAN, use managed switches, and never run a live show over Wi-Fi. Broadcast traffic on a shared network is a classic cause of dropped frames and stuttering movement. If you use multicast with sACN, enable IGMP snooping.
In summary
Art-Net is the practical answer when one DMX universe is no longer enough. It carries lighting data across a normal network and hands it back as DMX exactly where it is needed. Its main alternative is sACN (E1.31), which uses multicast and adds a priority field for redundancy; most modern nodes speak both.
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