Apparatus

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sensors Mode-S transponder

3E120A

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-HYAK · AIRBUS HELICOPTERS EC-145

Hex
3E120A
Octal
17411012
Decimal
4,067,850
Country
DE
Tail
D-HYAK
Type
EC45
No current signal · last broadcast 12h ago
Flights observed
8
Distinct callsigns
1
Country
DE
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 3E120A.

Country allocation

The ICAO 24-bit address 3E120A falls within the block assigned to Germany (DE) by ICAO Annex 10, Volume III. Every aircraft registered in Germany 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
CHX71 - 8 2026-04-14

Recent flights last 8

DateFlightRouteTakeoffLandingDuration
2026-04-14 CHX71 - Apr 14, 10:05 UTCApr 14, 10:40 UTC35m
2026-04-14 CHX71 - Apr 14, 07:35 UTCApr 14, 08:20 UTC45m
2026-04-14 CHX71 - Apr 14, 06:20 UTCApr 14, 06:55 UTC35m
2026-04-13 CHX71 - Apr 13, 18:45 UTCApr 13, 19:05 UTC20m
2026-04-13 CHX71 - Apr 13, 13:10 UTCApr 13, 13:50 UTC40m
2026-04-13 CHX71 - Apr 13, 11:00 UTCApr 13, 12:00 UTC1h 0m
2026-04-13 CHX71 - Apr 13, 09:10 UTCApr 13, 09:20 UTC10m
2026-04-13 CHX71 - Apr 13, 08:05 UTCApr 13, 08:15 UTC10m

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 D-HYAK page for operator, model, and routing details .

Mode-S 3E120A frequently asked

What is Mode-S code 3E120A?
3E120A is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-HYAK.
Where is Mode-S 3E120A registered?
Mode-S code 3E120A is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3E120A broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3E120A, octal 17411012, decimal 4,067,850.
What flights does 3E120A operate?
Mode-S 3E120A has broadcast 1 distinct callsign, including CHX71.