Apparatus

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sensors Mode-S transponder

A2C56D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N278NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A2C56D
Octal
50542555
Decimal
10,667,373
Country
US
Tail
N278NN
Type
E75L
Broadcasting now · callsign ENY3440 · 30,000 ft
Flights observed
753
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:20 UTC

Current position

A2C56D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2C56D 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
ENY4171 - 8 2026-07-15
ENY3442 Envoy Air 7 2026-07-25
ENY3968 - 6 2026-06-24
ENY3870 - 6 2026-06-17
ENY3776 - 6 2026-07-08
ENY3609 Envoy Air 6 2026-05-06
ENY3605 Envoy Air 6 2026-07-20
ENY3598 - 6 2026-06-24
ENY3485 Envoy Air 6 2026-06-08
ENY3362 Envoy Air 6 2026-05-16
ENY4177 - 5 2026-07-21
ENY4113 Envoy Air 5 2026-04-22
ENY4072 Envoy Air 5 2026-07-21
ENY4040 Envoy Air 5 2026-04-29
ENY3827 Envoy Air 5 2026-05-08
ENY3721 - 5 2026-06-24
ENY3708 - 5 2026-06-18
ENY3656 Envoy Air 5 2026-05-18
ENY3566 Envoy Air 5 2026-04-29
ENY3550 Envoy Air 5 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3791 BNA → TPA Jul 26, 17:30 UTCJul 26, 19:10 UTC1h 40m
2026-07-26 ENY3791 BNA → TPA Jul 26, 14:40 UTCJul 26, 16:20 UTC1h 40m
2026-07-26 ENY4261 AVL → DFW Jul 26, 11:35 UTCJul 26, 13:40 UTC2h 5m
2026-07-26 ENY4260 DFW → AVL Jul 26, 00:45 UTCJul 26, 02:35 UTC1h 50m
2026-07-25 ENY3580 MSY → DCA Jul 25, 21:05 UTCJul 25, 22:30 UTC1h 25m
2026-07-25 ENY3580 MSY → DCA Jul 25, 18:35 UTCJul 25, 20:00 UTC1h 25m
2026-07-25 ENY3442 ORD → EWR Jul 25, 16:00 UTCJul 25, 17:10 UTC1h 10m
2026-07-25 ENY3442 ORD → EWR Jul 25, 15:52 UTCJul 25, 17:10 UTC1h 18m
2026-07-25 ENY3442 ORD → EWR Jul 25, 13:50 UTCJul 25, 14:45 UTC55m
2026-07-25 ENY3885 CRP → DFW Jul 25, 11:05 UTCJul 25, 12:10 UTC1h 5m
2026-07-25 ENY4065 DFW → CRP Jul 25, 03:55 UTCJul 25, 04:45 UTC50m
2026-07-25 ENY4065 DFW → CRP Jul 25, 03:47 UTCJul 25, 04:42 UTC55m
2026-07-25 ENY557G GSP → DFW Jul 25, 00:20 UTCJul 25, 02:25 UTC2h 5m
2026-07-24 ENY3558 TRI → DFW Jul 24, 22:00 UTCJul 24, 23:30 UTC1h 30m
2026-07-24 ENY3927 PWM → ORD Jul 24, 19:15 UTCJul 24, 19:50 UTC35m
2026-07-24 ENY3927 PWM → ORD Jul 24, 17:05 UTCJul 24, 17:30 UTC25m
2026-07-24 ENY3978 GSP → ORD Jul 24, 14:55 UTCJul 24, 15:20 UTC25m
2026-07-24 ENY3978 GSP → ORD Jul 24, 12:55 UTCJul 24, 13:20 UTC25m
2026-07-24 ENY3662 MSN → AUS Jul 24, 09:25 UTCJul 24, 11:35 UTC2h 10m
2026-07-24 ENY3550 CVG → ORD Jul 24, 02:05 UTCJul 24, 04:20 UTC2h 15m
2026-07-23 ENY3629 MIA → AZS Jul 23, 22:45 UTCJul 24, 00:25 UTC1h 40m
2026-07-23 ENY3629 MIA → AZS Jul 23, 20:05 UTCJul 23, 21:45 UTC1h 40m
2026-07-23 ENY3386 ORD → CMH Jul 23, 14:20 UTCJul 23, 15:40 UTC1h 20m
2026-07-23 ENY3386 ORD → CMH Jul 23, 14:15 UTCJul 23, 15:40 UTC1h 25m
2026-07-23 ENY4109 MIA → PNS Jul 23, 03:30 UTCJul 23, 04:50 UTC1h 20m
2026-07-22 ENY3595 DCA → RSW Jul 22, 23:00 UTCJul 23, 00:55 UTC1h 55m
2026-07-22 ENY3595 DCA → RSW Jul 22, 22:57 UTCJul 23, 00:54 UTC1h 57m
2026-07-22 ENY3595 DCA → RSW Jul 22, 19:45 UTCJul 22, 21:40 UTC1h 55m
2026-07-22 ENY3518 MLU → DFW Jul 22, 17:55 UTCJul 22, 18:15 UTC20m
2026-07-22 ENY3518 MLU → DFW Jul 22, 16:25 UTCJul 22, 16:40 UTC15m
2026-07-22 ENY3342 MEM → PHX Jul 22, 12:35 UTCJul 22, 14:55 UTC2h 20m
2026-07-22 ENY3342 MEM → PHX Jul 22, 12:26 UTCJul 22, 14:53 UTC2h 27m
2026-07-21 ENY3376 - Jul 21, 23:00 UTCJul 22, 01:15 UTC2h 15m
2026-07-21 ENY3376 MIA → EIS Jul 21, 22:59 UTCJul 22, 01:22 UTC2h 23m
2026-07-21 ENY4072 CZM → MIA Jul 21, 20:35 UTCJul 21, 21:50 UTC1h 15m
2026-07-21 ENY4072 CZM → MIA Jul 21, 18:05 UTCJul 21, 19:20 UTC1h 15m
2026-07-21 ENY4177 - Jul 21, 15:55 UTCJul 21, 16:15 UTC20m
2026-07-21 ENY4177 FPO → MIA Jul 21, 15:46 UTCJul 21, 16:14 UTC28m
2026-07-21 ENY4177 - Jul 21, 14:20 UTCJul 21, 14:35 UTC15m
2026-07-21 ENY3501 - Jul 21, 11:15 UTCJul 21, 12:55 UTC1h 40m
2026-07-21 ENY3474 ORD → DSM Jul 21, 01:10 UTCJul 21, 02:50 UTC1h 40m
2026-07-20 ENY3420 DFW → MAF Jul 20, 23:15 UTCJul 20, 23:40 UTC25m
2026-07-20 ENY3420 DFW → MAF Jul 20, 21:10 UTCJul 20, 21:40 UTC30m
2026-07-20 ENY4317 PHX → GRB Jul 20, 17:25 UTCJul 20, 19:40 UTC2h 15m
2026-07-20 ENY3515 - Jul 20, 15:40 UTCJul 20, 16:00 UTC20m
2026-07-20 ENY3515 - Jul 20, 14:10 UTCJul 20, 14:30 UTC20m
2026-07-20 ENY4301 - Jul 20, 11:10 UTCJul 20, 12:30 UTC1h 20m
2026-07-20 ENY4300 MSY → DFW Jul 20, 03:35 UTCJul 20, 04:45 UTC1h 10m
2026-07-20 ENY4300 MSY → DFW Jul 20, 03:32 UTCJul 20, 04:52 UTC1h 20m
2026-07-20 ENY3605 BNA → TPA Jul 20, 01:35 UTCJul 20, 02:40 UTC1h 5m

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 N278NN page for operator, model, and routing details .

Mode-S A2C56D frequently asked

What is Mode-S code A2C56D?
A2C56D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N278NN.
Where is Mode-S A2C56D registered?
Mode-S code A2C56D 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 A2C56D broadcasting right now?
Yes. Mode-S A2C56D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2C56D, octal 50542555, decimal 10,667,373.
What flights does A2C56D operate?
Mode-S A2C56D has broadcast 20 distinct callsigns, including ENY4171, ENY3442, ENY3968, ENY3870, ENY3776.