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sensors Mode-S transponder

471A7B

ICAO 24-bit transponder address · allocated to Hungary

Currently assigned to HA-KAT · ATR-72-202

Hex
471A7B
Octal
21615173
Decimal
4,659,835
Country
HU
Tail
HA-KAT
Type
AT72
Photo of HA-KAT
Broadcasting now · callsign BRD7142 · 4,375 ft
Flights observed
6
Distinct callsigns
2
Country
HU
Last broadcast
15h ago

Current position

471A7B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 471A7B falls within the block assigned to Hungary (HU) by ICAO Annex 10, Volume III. Every aircraft registered in Hungary 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 2 distinct

Callsign Airline Flights Last seen
BRD7141 - 4 2026-04-14
BRD7142 - 2 2026-04-13

Recent flights last 6

DateFlightRouteTakeoffLandingDuration
2026-04-14 BRD7141 - Apr 14, 09:50 UTCApr 14, 11:05 UTC1h 15m
2026-04-13 BRD7142 - Apr 13, 16:15 UTCApr 13, 17:45 UTC1h 30m
2026-04-13 BRD7142 - Apr 13, 16:05 UTCApr 13, 16:15 UTC10m
2026-04-13 BRD7141 - Apr 13, 08:20 UTCApr 13, 08:30 UTC10m
2026-04-13 BRD7141 - Apr 13, 07:55 UTCApr 13, 08:30 UTC35m
2026-04-13 BRD7141 - Apr 13, 06:40 UTCApr 13, 08:15 UTC1h 35m

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 HA-KAT page for operator, model, and routing details .

Mode-S 471A7B frequently asked

What is Mode-S code 471A7B?
471A7B is an ICAO 24-bit transponder address. Allocated to Hungary. Assigned to HA-KAT.
Where is Mode-S 471A7B registered?
Mode-S code 471A7B is allocated to Hungary (HU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 471A7B broadcasting right now?
Yes. Mode-S 471A7B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 471A7B, octal 21615173, decimal 4,659,835.
What flights does 471A7B operate?
Mode-S 471A7B has broadcast 2 distinct callsigns, including BRD7141, BRD7142.