Apparatus

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sensors Mode-S transponder

A1FC3B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N227NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A1FC3B
Octal
50376073
Decimal
10,615,867
Country
US
Tail
N227NN
Type
E75L
No current signal · last broadcast 37m ago
Flights observed
639
Distinct callsigns
20
Country
US
Last broadcast
37m ago

Last known position

Most recent position reported by Mode-S A1FC3B.

Country allocation

The ICAO 24-bit address A1FC3B 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 20 distinct

Callsign Airline Flights Last seen
ENY3998 - 9 2026-06-22
ENY3992 - 9 2026-07-07
ENY3440 - 9 2026-07-08
ENY4089 - 8 2026-07-04
ENY3509 Envoy Air 8 2026-06-11
ENY3721 - 6 2026-07-13
ENY3709 Envoy Air 6 2026-04-18
ENY3609 Envoy Air 6 2026-05-11
ENY3576 - 6 2026-06-27
ENY4182 Envoy Air 5 2026-05-13
ENY4033 - 5 2026-06-28
ENY4021 - 5 2026-07-02
ENY3720 - 5 2026-07-03
ENY3623 Envoy Air 5 2026-06-03
ENY3564 Envoy Air 5 2026-05-31
ENY4291 Envoy Air 4 2026-05-05
ENY4220 Envoy Air 4 2026-05-12
ENY4192 - 4 2026-06-21
ENY4099 - 4 2026-07-06
ENY4092 - 4 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ENY3388 - Jul 14, 03:25 UTCJul 14, 04:10 UTC45m
2026-07-14 ENY3388 - Jul 14, 00:05 UTCJul 14, 00:45 UTC40m
2026-07-13 ENY3721 MSY → DFW Jul 13, 21:15 UTCJul 13, 22:30 UTC1h 15m
2026-07-13 ENY3721 MSY → DFW Jul 13, 21:15 UTCJul 13, 22:28 UTC1h 13m
2026-07-13 ENY3721 DFW → MSY Jul 13, 19:20 UTCJul 13, 20:25 UTC1h 5m
2026-07-13 ENY3397 BNA → DFW Jul 13, 16:20 UTCJul 13, 18:00 UTC1h 40m
2026-07-13 ENY3397 BNA → DFW Jul 13, 16:16 UTCJul 13, 17:45 UTC1h 29m
2026-07-13 ENY3397 DFW → BNA Jul 13, 13:25 UTCJul 13, 15:15 UTC1h 50m
2026-07-13 ENY3842 - Jul 13, 10:10 UTCJul 13, 10:45 UTC35m
2026-07-13 ENY3842 SGF → DFW Jul 13, 10:06 UTCJul 13, 11:04 UTC58m
2026-07-13 ENY4092 - Jul 13, 05:45 UTCJul 13, 06:45 UTC1h 0m
2026-07-13 ENY3689 - Jul 13, 01:55 UTCJul 13, 03:45 UTC1h 50m
2026-07-12 ENY3689 - Jul 12, 20:55 UTCJul 12, 22:00 UTC1h 5m
2026-07-12 ENY3384 - Jul 12, 18:45 UTCJul 12, 19:45 UTC1h 0m
2026-07-12 ENY3384 - Jul 12, 16:45 UTCJul 12, 17:25 UTC40m
2026-07-12 ENY3801 - Jul 12, 14:45 UTCJul 12, 15:50 UTC1h 5m
2026-07-12 ENY3801 - Jul 12, 12:40 UTCJul 12, 13:35 UTC55m
2026-07-12 ENY3988 - Jul 12, 10:05 UTCJul 12, 11:01 UTC55m
2026-07-12 ENY4281 STL → TUL Jul 12, 07:25 UTCJul 12, 08:20 UTC55m
2026-07-12 ENY4281 ORD → STL Jul 12, 04:01 UTCJul 12, 05:01 UTC1h 0m
2026-07-11 ENY3458 CID → ORD Jul 11, 23:50 UTCJul 12, 00:30 UTC40m
2026-07-11 ENY3458 - Jul 11, 22:15 UTCJul 11, 22:50 UTC35m
2026-07-11 ENY3711 - Jul 11, 18:15 UTCJul 11, 18:45 UTC30m
2026-07-11 ENY3711 BOS → ORD Jul 11, 18:12 UTCJul 11, 20:22 UTC2h 10m
2026-07-11 ENY3354 - Jul 11, 15:40 UTCJul 11, 17:20 UTC1h 40m
2026-07-10 ENY3341 BOS → MYR Jul 10, 23:41 UTCJul 11, 02:02 UTC2h 21m
2026-07-10 ENY3341 - Jul 10, 23:45 UTCJul 11, 01:55 UTC2h 10m
2026-07-10 ENY3470 - Jul 10, 19:55 UTCJul 10, 21:20 UTC1h 25m
2026-07-10 ENY3470 - Jul 10, 17:00 UTCJul 10, 18:45 UTC1h 45m
2026-07-10 ENY4106 ORD → BOS Jul 10, 13:55 UTCJul 10, 15:45 UTC1h 50m
2026-07-10 ENY3445 - Jul 10, 11:10 UTCJul 10, 11:35 UTC25m
2026-07-10 ENY4034 - Jul 10, 02:35 UTCJul 10, 04:05 UTC1h 30m
2026-07-10 ENY3691 IAB → DFW Jul 10, 00:15 UTCJul 10, 01:10 UTC55m
2026-07-09 ENY3691 - Jul 9, 22:20 UTCJul 9, 23:15 UTC55m
2026-07-09 ENY3547 - Jul 9, 20:20 UTCJul 9, 21:10 UTC50m
2026-07-09 ENY3547 - Jul 9, 18:50 UTCJul 9, 19:10 UTC20m
2026-07-09 ENY3591 ORD → RDU Jul 9, 16:50 UTCJul 9, 17:35 UTC45m
2026-07-09 ENY3591 ORD → RDU Jul 9, 15:15 UTCJul 9, 16:00 UTC45m
2026-07-09 ENY3985 - Jul 9, 13:15 UTCJul 9, 14:15 UTC1h 0m
2026-07-08 ENY4086 PHX → XNA Jul 8, 23:10 UTCJul 9, 01:40 UTC2h 30m
2026-07-08 ENY4086 PHX → XNA Jul 8, 23:09 UTCJul 9, 01:39 UTC2h 30m
2026-07-08 ENY3793 SEA → PHX Jul 8, 19:00 UTCJul 8, 21:20 UTC2h 20m
2026-07-08 ENY3793 PHX → SEA Jul 8, 15:10 UTCJul 8, 17:45 UTC2h 35m
2026-07-08 ENY3440 SEA → PHX Jul 8, 03:25 UTCJul 8, 06:00 UTC2h 35m
2026-07-07 ENY3440 PHX → SEA Jul 7, 19:05 UTCJul 7, 21:40 UTC2h 35m
2026-07-07 ENY3992 BUR → PHX Jul 7, 16:45 UTCJul 7, 17:55 UTC1h 10m
2026-07-07 ENY3992 BUR → PHX Jul 7, 16:40 UTCJul 7, 17:47 UTC1h 7m
2026-07-07 ENY3992 PHX → BUR Jul 7, 14:45 UTCJul 7, 15:50 UTC1h 5m
2026-07-07 ENY3497 - Jul 7, 11:10 UTCJul 7, 13:15 UTC2h 5m
2026-07-07 ENY3494 SGF → DFW Jul 7, 02:25 UTCJul 7, 04:25 UTC2h 0m

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 N227NN page for operator, model, and routing details .

Mode-S A1FC3B frequently asked

What is Mode-S code A1FC3B?
A1FC3B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N227NN.
Where is Mode-S A1FC3B registered?
Mode-S code A1FC3B 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 A1FC3B broadcasting right now?
No active broadcast right now. Last signal was 37m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1FC3B, octal 50376073, decimal 10,615,867.
What flights does A1FC3B operate?
Mode-S A1FC3B has broadcast 20 distinct callsigns, including ENY3998, ENY3992, ENY3440, ENY4089, ENY3509.