HEXADECIMAL Code FF****

[acopata]

Hello everyone!!
Does anyone get FF**** codes?

[Anmer]

Welcome.

I'll admit my ignorance but what messages are "FF"?

[acopata]

I don't know, but they appear in dump1090

[mhm]

Thought the highest they went to was E84 for Equador

[acopata]

I think the FF**** codes are not ICAO codes

[Anmer]

If a message doesn't include an ICAO hex code, what use is it?  Just curious.

[acopata]

I would like to know the same for MLAT.

[Anmer]

Thanks.

Multilateration normally needs to identify the same aircraft from at least three ground stations.  For this it needs a common identity.  The ModeS hex code is mostly used.

What server will do the multilateration and will the other ground stations be using Dump1090?

[acopata]

Yes.
Here a possible option https://github.com/mutability/mlat-server