Apparatus

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sensors Mode-S transponder

3C5641

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-AERA · BOEING 777-200LR

Hex
3C5641
Octal
17053101
Decimal
3,954,241
Country
DE
Tail
D-AERA
Type
B77L
No current signal · last broadcast 14h ago
Flights observed
9
Distinct callsigns
3
Country
DE
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S 3C5641.

Country allocation

The ICAO 24-bit address 3C5641 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 3 distinct

Callsign Airline Flights Last seen
BOX457 AeroLogic 5 2026-04-13
BOX911 - 2 2026-04-13
BOX720 - 2 2026-04-14

Recent flights last 9

DateFlightRouteTakeoffLandingDuration
2026-04-14 BOX720 - Apr 14, 07:40 UTCApr 14, 08:20 UTC40m
2026-04-14 BOX720 - Apr 14, 05:15 UTCApr 14, 06:55 UTC1h 40m
2026-04-13 BOX911 - Apr 13, 15:50 UTCApr 13, 15:55 UTC5m
2026-04-13 BOX911 - Apr 13, 15:20 UTCApr 13, 15:55 UTC35m
2026-04-13 BOX457 ATL → FRA Apr 13, 08:20 UTCApr 13, 09:50 UTC1h 30m
2026-04-13 BOX457 ATL → FRA Apr 13, 08:00 UTCApr 13, 09:50 UTC1h 50m
2026-04-13 BOX457 ATL → FRA Apr 13, 04:20 UTCApr 13, 08:15 UTC3h 55m
2026-04-13 BOX457 ATL → FRA Apr 13, 03:55 UTCApr 13, 04:50 UTC55m
2026-04-13 BOX457 ATL → FRA Apr 13, 01:55 UTCApr 13, 04:15 UTC2h 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 D-AERA page for operator, model, and routing details .

Mode-S 3C5641 frequently asked

What is Mode-S code 3C5641?
3C5641 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-AERA.
Where is Mode-S 3C5641 registered?
Mode-S code 3C5641 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C5641 broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C5641, octal 17053101, decimal 3,954,241.
What flights does 3C5641 operate?
Mode-S 3C5641 has broadcast 3 distinct callsigns, including BOX457, BOX911, BOX720.