Apparatus

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sensors Mode-S transponder

4684B4

ICAO 24-bit transponder address · allocated to Greece

Currently assigned to SX-AET · DIAMOND DA-40 Club Star

Hex
4684B4
Octal
21502264
Decimal
4,621,492
Country
GR
Tail
SX-AET
Type
DA40
No current signal · last broadcast 11h ago
Flights observed
22
Distinct callsigns
1
Country
GR
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S 4684B4.

Country allocation

The ICAO 24-bit address 4684B4 falls within the block assigned to Greece (GR) by ICAO Annex 10, Volume III. Every aircraft registered in Greece receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
SXAET - 22 2026-04-18

Recent flights last 22

DateFlightRouteTakeoffLandingDuration
2026-04-18 SXAET - Apr 18, 07:25 UTCApr 18, 08:20 UTC55m
2026-04-18 SXAET - Apr 18, 06:40 UTCApr 18, 07:20 UTC40m
2026-04-17 SXAET - Apr 17, 09:05 UTCApr 17, 09:15 UTC10m
2026-04-17 SXAET - Apr 17, 07:20 UTCApr 17, 07:55 UTC35m
2026-04-17 SXAET - Apr 17, 05:20 UTCApr 17, 07:15 UTC1h 55m
2026-04-16 SXAET - Apr 16, 13:15 UTCApr 16, 15:10 UTC1h 55m
2026-04-16 SXAET - Apr 16, 11:09 UTCApr 16, 13:05 UTC1h 55m
2026-04-16 SXAET - Apr 16, 09:45 UTCApr 16, 11:04 UTC1h 20m
2026-04-16 SXAET - Apr 16, 05:54 UTCApr 16, 07:05 UTC1h 10m
2026-04-15 SXAET - Apr 15, 19:05 UTCApr 15, 19:30 UTC25m
2026-04-15 SXAET - Apr 15, 13:01 UTCApr 15, 14:30 UTC1h 30m
2026-04-15 SXAET - Apr 15, 12:40 UTCApr 15, 12:55 UTC15m
2026-04-15 SXAET - Apr 15, 09:35 UTCApr 15, 10:55 UTC1h 20m
2026-04-15 SXAET - Apr 15, 07:01 UTCApr 15, 08:20 UTC1h 20m
2026-04-15 SXAET - Apr 15, 05:35 UTCApr 15, 06:55 UTC1h 20m
2026-04-14 SXAET - Apr 14, 15:00 UTCApr 14, 16:40 UTC1h 40m
2026-04-14 SXAET - Apr 14, 13:50 UTCApr 14, 14:10 UTC20m
2026-04-14 SXAET - Apr 14, 12:10 UTCApr 14, 12:45 UTC35m
2026-04-14 SXAET - Apr 14, 10:50 UTCApr 14, 11:05 UTC15m
2026-04-14 SXAET - Apr 14, 10:05 UTCApr 14, 11:05 UTC1h 0m
2026-04-14 SXAET - Apr 14, 07:10 UTCApr 14, 08:10 UTC1h 0m
2026-04-14 SXAET - Apr 14, 05:50 UTCApr 14, 07:10 UTC1h 20m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the SX-AET page for operator, model, and routing details .

Mode-S 4684B4 frequently asked

What is Mode-S code 4684B4?
4684B4 is an ICAO 24-bit transponder address. Allocated to Greece. Assigned to SX-AET.
Where is Mode-S 4684B4 registered?
Mode-S code 4684B4 is allocated to Greece (GR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4684B4 broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4684B4, octal 21502264, decimal 4,621,492.
What flights does 4684B4 operate?
Mode-S 4684B4 has broadcast 1 distinct callsign, including SXAET.