Apparatus

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sensors Mode-S transponder

477FF4

ICAO 24-bit transponder address · allocated to Hungary

Currently assigned to 604 · AIRBUS A-319

Hex
477FF4
Octal
21677764
Decimal
4,685,812
Country
HU
Tail
604
Type
A319
No current signal · last broadcast 15h ago
Flights observed
104
Distinct callsigns
20
Country
HU
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 477FF4.

Country allocation

The ICAO 24-bit address 477FF4 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 20 distinct

Callsign Airline Flights Last seen
CAMEL64 - 26 2026-07-10
HUF174 - 6 2026-04-14
HUF182 - 5 2026-04-14
HUF192 - 3 2026-04-24
HUF523 - 2 2026-05-11
HUF255 - 2 2026-07-13
HUF250 - 2 2026-07-10
HUF249 - 2 2026-07-07
HUF248 - 2 2026-07-07
HUF247 - 2 2026-07-09
HUF246 - 2 2026-07-09
HUF245 - 2 2026-07-06
HUF243 - 2 2026-06-30
HUF242 - 2 2026-07-08
HUF239 - 2 2026-06-30
HUF238 - 2 2026-06-29
HUF237 - 2 2026-06-29
HUF236 - 2 2026-06-18
HUF227 - 2 2026-06-22
HUF221 - 2 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 HUF255 - Jul 13, 09:45 UTCJul 13, 11:25 UTC1h 40m
2026-07-13 HUF255 - Jul 13, 07:01 UTCJul 13, 08:55 UTC1h 55m
2026-07-10 CAMEL64 - Jul 10, 09:55 UTCJul 10, 10:50 UTC55m
2026-07-10 HUF250 - Jul 10, 07:45 UTCJul 10, 08:40 UTC55m
2026-07-10 HUF250 - Jul 10, 06:05 UTCJul 10, 07:00 UTC55m
2026-07-09 HUF247 - Jul 9, 19:25 UTCJul 9, 21:25 UTC2h 0m
2026-07-09 HUF247 - Jul 9, 13:20 UTCJul 9, 18:00 UTC4h 40m
2026-07-09 HUF246 - Jul 9, 11:35 UTCJul 9, 12:05 UTC30m
2026-07-09 HUF246 - Jul 9, 09:50 UTCJul 9, 10:30 UTC40m
2026-07-08 CAMEL64 - Jul 8, 11:20 UTCJul 8, 12:05 UTC45m
2026-07-08 HUF242 - Jul 8, 08:55 UTCJul 8, 10:10 UTC1h 15m
2026-07-08 HUF242 - Jul 8, 06:50 UTCJul 8, 07:40 UTC50m
2026-07-07 HUF248 - Jul 7, 12:30 UTCJul 7, 13:00 UTC30m
2026-07-07 HUF248 - Jul 7, 11:30 UTCJul 7, 12:00 UTC30m
2026-07-07 HUF249 - Jul 7, 08:55 UTCJul 7, 09:40 UTC45m
2026-07-07 HUF249 - Jul 7, 07:35 UTCJul 7, 08:05 UTC30m
2026-07-06 HUF245 - Jul 6, 09:10 UTCJul 6, 11:00 UTC1h 50m
2026-07-06 HUF245 - Jul 6, 06:20 UTCJul 6, 08:15 UTC1h 55m
2026-07-03 CAMEL64 - Jul 3, 12:10 UTCJul 3, 14:50 UTC2h 40m
2026-07-03 CAMEL64 - Jul 3, 09:50 UTCJul 3, 11:00 UTC1h 10m
2026-07-02 CAMEL64 - Jul 2, 11:00 UTCJul 2, 12:40 UTC1h 40m
2026-07-01 CAMEL64 - Jul 1, 12:05 UTCJul 1, 12:45 UTC40m
2026-07-01 HUF233 - Jul 1, 07:00 UTCJul 1, 09:45 UTC2h 45m
2026-06-30 HUF239 - Jun 30, 14:10 UTCJun 30, 16:10 UTC2h 0m
2026-06-30 HUF239 - Jun 30, 11:05 UTCJun 30, 13:15 UTC2h 10m
2026-06-30 HUF243 - Jun 30, 08:30 UTCJun 30, 10:10 UTC1h 40m
2026-06-30 HUF243 - Jun 30, 06:00 UTCJun 30, 07:45 UTC1h 45m
2026-06-29 HUF238 - Jun 29, 16:55 UTCJun 29, 18:34 UTC1h 40m
2026-06-29 HUF238 - Jun 29, 14:19 UTCJun 29, 16:00 UTC1h 40m
2026-06-29 CAMEL64 - Jun 29, 11:14 UTCJun 29, 12:24 UTC1h 10m
2026-06-29 HUF237 - Jun 29, 09:05 UTCJun 29, 10:29 UTC1h 25m
2026-06-29 HUF237 - Jun 29, 06:40 UTCJun 29, 07:59 UTC1h 20m
2026-06-22 HUF227 - Jun 22, 13:29 UTCJun 22, 15:05 UTC1h 35m
2026-06-22 HUF227 - Jun 22, 07:04 UTCJun 22, 08:40 UTC1h 35m
2026-06-18 HUF236 - Jun 18, 09:40 UTCJun 18, 10:15 UTC35m
2026-06-18 HUF236 - Jun 18, 08:10 UTCJun 18, 08:40 UTC30m
2026-06-17 CAMEL64 - Jun 17, 11:25 UTCJun 17, 11:45 UTC20m
2026-06-17 CAMEL64 - Jun 17, 09:45 UTCJun 17, 10:55 UTC1h 10m
2026-06-17 CAMEL64 - Jun 17, 08:50 UTCJun 17, 09:20 UTC30m
2026-06-17 CAMEL64 - Jun 17, 07:10 UTCJun 17, 08:15 UTC1h 5m
2026-06-16 HUF221 - Jun 16, 08:55 UTCJun 16, 10:04 UTC1h 10m
2026-06-16 HUF221 - Jun 16, 06:59 UTCJun 16, 08:00 UTC1h 0m
2026-06-15 CAMEL64 - Jun 15, 16:19 UTCJun 15, 17:20 UTC1h 0m
2026-06-15 CAMEL64 - Jun 15, 15:19 UTCJun 15, 15:45 UTC25m
2026-06-12 HUF216 - Jun 12, 08:45 UTCJun 12, 10:30 UTC1h 45m
2026-06-12 HUF216 - Jun 12, 06:10 UTCJun 12, 07:55 UTC1h 45m
2026-06-11 CAMEL64 - Jun 11, 10:30 UTCJun 11, 11:00 UTC30m
2026-06-11 CAMEL64 - Jun 11, 08:50 UTCJun 11, 09:55 UTC1h 5m
2026-06-11 CAMEL64 - Jun 11, 06:50 UTCJun 11, 07:45 UTC55m
2026-06-10 CAMEL64 - Jun 10, 11:40 UTCJun 10, 12:05 UTC25m

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 604 page for operator, model, and routing details .

Mode-S 477FF4 frequently asked

What is Mode-S code 477FF4?
477FF4 is an ICAO 24-bit transponder address. Allocated to Hungary. Assigned to 604.
Where is Mode-S 477FF4 registered?
Mode-S code 477FF4 is allocated to Hungary (HU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 477FF4 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 477FF4, octal 21677764, decimal 4,685,812.
What flights does 477FF4 operate?
Mode-S 477FF4 has broadcast 20 distinct callsigns, including CAMEL64, HUF174, HUF182, HUF192, HUF523.