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Appendix
Representations of Art-Net Port Addresses
According to the Art-Net 3 specification, the address of an Art-Net port consists of three parts: The Art-Net net, sub-
net and universe number. The Art-Net universe and sub-net number both have a value between 0 and 15 (4 bits).
Many controllers combine these values to the sub-uni number, resulting in a value between 0 and 255 (8 bits), with
the sub-net part occupying the more significant digits. Thus, the sub-uni can be calculated with the formula 16 x sub-
net + universe = sub-uni.
The Art-Net net number was added in Art-Net 3 and has a value between 0 and 127 (7 bits). So, when working with
controllers using Art-Net I or Art-Net II, the Art-Net net must be set to 0.
The Art-Net net, sub-net and universe can be combined to a 15-bit port address with values from 0 to 32767, as
shown below.
Bit Digit 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Subdivided Representation Net (0 - 127) Sub-Net (0 - 15) Universe (0 - 15)
Alternative Representation Net (0-127) Sub-Uni (0 – 255)
15-bit Port Address Rep. (0 – 32767)
For the instances where the Art-Net net number is 0, the 15-bit port address is equivalent to the sub-uni. The table
below gives an overview of the entire Art-Net 3 address space and how it is converted to a 15-bit port address.
Art-Net Address
15-bit Port Address
Net (0 - 127) Sub-Net (0 - 15) Universe (0 - 15)
0 0 0 0
Art
-N
et
II
ad
d
re
ss
e
s
0 0 1 1
… …
0 0 15 15
0 1 0 16
0 1 1 17
…
…
…
…
0 1 15 31
0 2 0 32
0 2 1 33
… …
0 15 15 255
1 0 0 256
1 0 1 257
…. ….
127 15 14 32766
127 15 15 32767
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