Apparatus

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sensors Mode-S transponder

A5DBB4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N477GC · operated by L-BIRD LLC

Hex
A5DBB4
Octal
51355664
Decimal
10,869,684
Country
US
Tail
N477GC
Type
GB1
No current signal · last broadcast 10d ago
Flights observed
60
Distinct callsigns
1
Country
US
Last broadcast
10d ago

Last known position

Most recent position reported by Mode-S A5DBB4.

Country allocation

The ICAO 24-bit address A5DBB4 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States 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 1 distinct

Callsign Airline Flights Last seen
N477GC - 60 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 N477GC - Jul 10, 16:50 UTCJul 10, 17:10 UTC20m
2026-07-10 N477GC - Jul 10, 14:50 UTCJul 10, 15:40 UTC50m
2026-07-09 N477GC - Jul 9, 20:25 UTCJul 9, 20:55 UTC30m
2026-07-09 N477GC - Jul 9, 18:40 UTCJul 9, 19:20 UTC40m
2026-07-09 N477GC - Jul 9, 16:30 UTCJul 9, 16:45 UTC15m
2026-07-09 N477GC - Jul 9, 15:40 UTCJul 9, 15:55 UTC15m
2026-07-09 N477GC - Jul 9, 13:40 UTCJul 9, 14:35 UTC55m
2026-07-08 N477GC - Jul 8, 19:55 UTCJul 8, 20:40 UTC45m
2026-07-04 N477GC - Jul 4, 14:50 UTCJul 4, 15:45 UTC55m
2026-07-01 N477GC - Jul 1, 18:30 UTCJul 1, 18:55 UTC25m
2026-06-29 N477GC - Jun 29, 17:45 UTCJun 29, 18:05 UTC20m
2026-06-24 N477GC - Jun 24, 18:34 UTCJun 24, 19:04 UTC30m
2026-06-24 N477GC - Jun 24, 14:34 UTCJun 24, 14:55 UTC20m
2026-06-19 N477GC - Jun 19, 19:39 UTCJun 19, 19:59 UTC20m
2026-06-19 N477GC - Jun 19, 14:39 UTCJun 19, 15:24 UTC45m
2026-06-18 N477GC - Jun 18, 16:05 UTCJun 18, 16:40 UTC35m
2026-06-18 N477GC - Jun 18, 14:25 UTCJun 18, 15:00 UTC35m
2026-06-18 N477GC - Jun 18, 12:30 UTCJun 18, 12:55 UTC25m
2026-06-17 N477GC - Jun 17, 18:40 UTCJun 17, 19:30 UTC50m
2026-06-17 N477GC - Jun 17, 16:40 UTCJun 17, 16:50 UTC10m
2026-06-16 N477GC - Jun 16, 20:45 UTCJun 16, 21:00 UTC15m
2026-06-05 N477GC - Jun 5, 14:45 UTCJun 5, 15:20 UTC35m
2026-06-04 N477GC - Jun 4, 20:20 UTCJun 4, 20:50 UTC30m
2026-06-04 N477GC - Jun 4, 19:00 UTCJun 4, 19:20 UTC20m
2026-06-04 N477GC - Jun 4, 18:10 UTCJun 4, 18:25 UTC15m
2026-06-04 N477GC - Jun 4, 16:40 UTCJun 4, 17:00 UTC20m
2026-06-04 N477GC - Jun 4, 15:05 UTCJun 4, 15:15 UTC10m
2026-06-03 N477GC - Jun 3, 20:10 UTCJun 3, 20:25 UTC15m
2026-06-03 N477GC - Jun 3, 18:00 UTCJun 3, 18:40 UTC40m
2026-05-26 N477GC - May 26, 17:50 UTCMay 26, 18:05 UTC15m
2026-05-26 N477GC - May 26, 16:24 UTCMay 26, 16:40 UTC15m
2026-05-13 N477GC - May 13, 14:20 UTCMay 13, 14:45 UTC25m
2026-05-12 N477GC - May 12, 19:25 UTCMay 12, 19:50 UTC25m
2026-05-12 N477GC - May 12, 16:30 UTCMay 12, 16:50 UTC20m
2026-05-12 N477GC - May 12, 15:10 UTCMay 12, 15:45 UTC35m
2026-05-11 N477GC - May 11, 19:05 UTCMay 11, 19:30 UTC25m
2026-05-11 N477GC - May 11, 16:55 UTCMay 11, 17:20 UTC26m
2026-05-09 N477GC - May 9, 15:30 UTCMay 9, 17:30 UTC2h 0m
2026-05-05 N477GC - May 5, 21:25 UTCMay 5, 22:01 UTC35m
2026-05-05 N477GC - May 5, 19:45 UTCMay 5, 20:10 UTC25m
2026-05-05 N477GC - May 5, 17:25 UTCMay 5, 18:05 UTC40m
2026-05-04 N477GC - May 4, 20:40 UTCMay 4, 21:25 UTC45m
2026-04-29 N477GC - Apr 29, 18:30 UTCApr 29, 18:45 UTC15m
2026-04-28 N477GC - Apr 28, 15:35 UTCApr 28, 15:55 UTC20m
2026-04-27 N477GC - Apr 27, 19:40 UTCApr 27, 20:40 UTC1h 0m
2026-04-27 N477GC - Apr 27, 16:35 UTCApr 27, 17:00 UTC25m
2026-04-24 N477GC - Apr 24, 15:30 UTCApr 24, 16:05 UTC35m
2026-04-23 N477GC - Apr 23, 18:50 UTCApr 23, 19:20 UTC30m
2026-04-23 N477GC - Apr 23, 17:10 UTCApr 23, 17:25 UTC15m
2026-04-22 N477GC - Apr 22, 19:10 UTCApr 22, 20:00 UTC50m

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 N477GC page for operator, model, and routing details .

Mode-S A5DBB4 frequently asked

What is Mode-S code A5DBB4?
A5DBB4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N477GC.
Where is Mode-S A5DBB4 registered?
Mode-S code A5DBB4 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A5DBB4 broadcasting right now?
No active broadcast right now. Last signal was 10d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5DBB4, octal 51355664, decimal 10,869,684.
What flights does A5DBB4 operate?
Mode-S A5DBB4 has broadcast 1 distinct callsign, including N477GC.