sensors Mode-S transponder

3C459A

ICAO 24-bit transponder address · allocated to Germany

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

Hex
3C459A
Octal
17042632
Decimal
3,949,978
Country
DE
Tail
D-AALZ
Type
B77L
No current signal · last broadcast 12h ago
Flights observed
7
Distinct callsigns
3
Country
DE
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 3C459A.

Country allocation

The ICAO 24-bit address 3C459A 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
BOX391 - 4 2026-04-13
BOX584 - 2 2026-04-14
BOX390 - 1 2026-04-12

Recent flights last 7

DateFlightRouteTakeoffLandingDuration
2026-04-14 BOX584 - Apr 14, 10:55 UTCApr 14, 11:05 UTC10m
2026-04-14 BOX584 - Apr 14, 05:30 UTCApr 14, 06:20 UTC50m
2026-04-13 BOX391 - Apr 13, 17:05 UTCApr 13, 18:55 UTC1h 50m
2026-04-13 BOX391 - Apr 13, 12:20 UTCApr 13, 12:35 UTC15m
2026-04-13 BOX391 - Apr 13, 11:55 UTCApr 13, 12:35 UTC40m
2026-04-13 BOX391 - Apr 13, 11:05 UTCApr 13, 12:15 UTC1h 10m
2026-04-12 BOX390 LNN → CVG Apr 12, 17:15 UTCApr 12, 17:55 UTC40m

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

Mode-S 3C459A frequently asked

What is Mode-S code 3C459A?
3C459A is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-AALZ.
Where is Mode-S 3C459A registered?
Mode-S code 3C459A is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C459A 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 3C459A, octal 17042632, decimal 3,949,978.
What flights does 3C459A operate?
Mode-S 3C459A has broadcast 3 distinct callsigns, including BOX391, BOX584, BOX390.