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sensors Mode-S transponder

3C71A1

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-ALMA · AIRBUS A-330-200

Hex
3C71A1
Octal
17070641
Decimal
3,961,249
Country
DE
Tail
D-ALMA
Type
A332
Broadcasting now · callsign BCS62A · 500 ft
Flights observed
6
Distinct callsigns
4
Country
DE
Last broadcast
15h ago

Current position

3C71A1 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 3C71A1 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 4 distinct

Callsign Airline Flights Last seen
BCS082 European Air Transport 2 2026-04-13
BCS081 - 2 2026-04-14
BCS62A - 1 2026-04-13
BCS120 - 1 2026-04-12

Recent flights last 6

DateFlightRouteTakeoffLandingDuration
2026-04-14 BCS081 - Apr 14, 07:10 UTCApr 14, 07:20 UTC10m
2026-04-14 BCS081 - Apr 14, 05:15 UTCApr 14, 07:10 UTC1h 55m
2026-04-13 BCS62A BRU → LEJ Apr 13, 22:10 UTCApr 13, 23:05 UTC55m
2026-04-13 BCS082 LOS → LOS Apr 13, 19:50 UTCApr 13, 20:00 UTC10m
2026-04-13 BCS082 LOS → LOS Apr 13, 18:05 UTCApr 13, 20:00 UTC1h 55m
2026-04-12 BCS120 LEJ → BRU Apr 12, 18:40 UTCApr 12, 19:35 UTC55m

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-ALMA page for operator, model, and routing details .

Mode-S 3C71A1 frequently asked

What is Mode-S code 3C71A1?
3C71A1 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-ALMA.
Where is Mode-S 3C71A1 registered?
Mode-S code 3C71A1 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C71A1 broadcasting right now?
Yes. Mode-S 3C71A1 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C71A1, octal 17070641, decimal 3,961,249.
What flights does 3C71A1 operate?
Mode-S 3C71A1 has broadcast 4 distinct callsigns, including BCS082, BCS081, BCS62A, BCS120.