Apparatus

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sensors Mode-S transponder

A44F77

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N377TB · operated by BUCKAIR LLC

Hex
A44F77
Octal
51047567
Decimal
10,768,247
Country
US
Tail
N377TB
Type
C680
No current signal · last broadcast 2h ago
Flights observed
135
Distinct callsigns
1
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A44F77.

Country allocation

The ICAO 24-bit address A44F77 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
EJM377 - 135 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 EJM377 - Jul 17, 19:20 UTCJul 17, 20:20 UTC1h 0m
2026-07-17 EJM377 - Jul 17, 16:04 UTCJul 17, 18:34 UTC2h 30m
2026-07-16 EJM377 - Jul 16, 18:29 UTCJul 16, 20:45 UTC2h 15m
2026-07-16 EJM377 - Jul 16, 17:20 UTCJul 16, 17:40 UTC20m
2026-07-16 EJM377 - Jul 16, 14:40 UTCJul 16, 16:30 UTC1h 50m
2026-07-15 EJM377 - Jul 15, 20:30 UTCJul 15, 22:20 UTC1h 50m
2026-07-15 EJM377 OAK → MSP Jul 15, 16:25 UTCJul 15, 19:45 UTC3h 20m
2026-07-14 EJM377 LUK → OAK Jul 14, 17:10 UTCJul 14, 23:45 UTC6h 34m
2026-07-14 EJM377 - Jul 14, 14:45 UTCJul 14, 15:45 UTC1h 0m
2026-07-13 EJM377 - Jul 13, 22:25 UTCJul 13, 23:20 UTC55m
2026-07-13 EJM377 - Jul 13, 18:05 UTCJul 13, 18:40 UTC35m
2026-07-13 EJM377 - Jul 13, 14:45 UTCJul 13, 17:00 UTC2h 15m
2026-07-13 EJM377 - Jul 13, 11:55 UTCJul 13, 13:05 UTC1h 10m
2026-07-12 EJM377 - Jul 12, 22:25 UTCJul 12, 23:40 UTC1h 15m
2026-07-12 EJM377 - Jul 12, 18:40 UTCJul 12, 19:05 UTC25m
2026-07-12 EJM377 TEB → DAY Jul 12, 16:05 UTCJul 12, 17:30 UTC1h 25m
2026-07-12 EJM377 - Jul 12, 14:05 UTCJul 12, 15:01 UTC55m
2026-07-11 EJM377 - Jul 11, 16:45 UTCJul 11, 19:45 UTC3h 0m
2026-07-11 EJM377 - Jul 11, 15:10 UTCJul 11, 15:30 UTC20m
2026-07-10 EJM377 - Jul 10, 20:05 UTCJul 11, 02:35 UTC6h 30m
2026-07-10 EJM377 - Jul 10, 18:15 UTCJul 10, 19:35 UTC1h 20m
2026-07-09 EJM377 - Jul 9, 18:25 UTCJul 9, 21:40 UTC3h 15m
2026-07-09 EJM377 - Jul 9, 16:20 UTCJul 9, 17:10 UTC50m
2026-07-08 EJM377 - Jul 8, 22:10 UTCJul 8, 22:40 UTC30m
2026-07-08 EJM377 - Jul 8, 18:45 UTCJul 8, 21:35 UTC2h 50m
2026-07-07 EJM377 - Jul 7, 18:55 UTCJul 7, 19:15 UTC20m
2026-07-07 EJM377 - Jul 7, 14:45 UTCJul 7, 17:35 UTC2h 50m
2026-07-06 EJM377 - Jul 6, 20:30 UTCJul 6, 21:45 UTC1h 15m
2026-07-06 EJM377 - Jul 6, 17:20 UTCJul 6, 19:40 UTC2h 20m
2026-07-06 EJM377 - Jul 6, 14:10 UTCJul 6, 15:00 UTC50m
2026-07-06 EJM377 BNA → MSY Jul 6, 12:20 UTCJul 6, 13:30 UTC1h 10m
2026-07-05 EJM377 - Jul 5, 20:15 UTCJul 5, 21:30 UTC1h 15m
2026-07-05 EJM377 - Jul 5, 17:35 UTCJul 5, 19:35 UTC2h 0m
2026-07-05 EJM377 - Jul 5, 15:15 UTCJul 5, 16:15 UTC1h 0m
2026-07-03 EJM377 - Jul 3, 17:20 UTCJul 3, 18:40 UTC1h 20m
2026-07-03 EJM377 - Jul 3, 14:05 UTCJul 3, 16:20 UTC2h 15m
2026-07-02 EJM377 SBD → AUZ Jul 2, 16:10 UTCJul 3, 00:15 UTC8h 5m
2026-07-01 EJM377 - Jul 1, 20:30 UTCJul 1, 21:30 UTC1h 0m
2026-07-01 EJM377 - Jul 1, 19:15 UTCJul 1, 19:35 UTC20m
2026-07-01 EJM377 - Jul 1, 13:50 UTCJul 1, 18:10 UTC4h 20m
2026-06-30 EJM377 RST → PWK Jun 30, 21:05 UTCJun 30, 21:50 UTC45m
2026-06-30 EJM377 - Jun 30, 17:05 UTCJun 30, 20:20 UTC3h 15m
2026-06-30 EJM377 - Jun 30, 13:20 UTCJun 30, 15:45 UTC2h 25m
2026-06-28 EJM377 - Jun 28, 20:25 UTCJun 28, 23:50 UTC3h 25m
2026-06-28 EJM377 - Jun 28, 15:05 UTCJun 28, 19:20 UTC4h 15m
2026-06-28 EJM377 - Jun 28, 12:39 UTCJun 28, 13:25 UTC45m
2026-06-26 EJM377 - Jun 26, 22:29 UTCJun 26, 23:34 UTC1h 5m
2026-06-26 EJM377 - Jun 26, 19:50 UTCJun 26, 21:30 UTC1h 40m
2026-06-26 EJM377 - Jun 26, 16:44 UTCJun 26, 17:59 UTC1h 15m
2026-06-23 EJM377 - Jun 23, 20:34 UTCJun 23, 21:14 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 N377TB page for operator, model, and routing details .

Mode-S A44F77 frequently asked

What is Mode-S code A44F77?
A44F77 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N377TB.
Where is Mode-S A44F77 registered?
Mode-S code A44F77 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 A44F77 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A44F77, octal 51047567, decimal 10,768,247.
What flights does A44F77 operate?
Mode-S A44F77 has broadcast 1 distinct callsign, including EJM377.