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sensors Mode-S transponder

A23C5D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N243NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A23C5D
Octal
50436135
Decimal
10,632,285
Country
US
Tail
N243NN
Type
E75L
No current signal · last broadcast 1h ago
Flights observed
649
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A23C5D.

Country allocation

The ICAO 24-bit address A23C5D 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
ENY4164 - 12 2026-07-05
ENY3455 - 8 2026-07-04
ENY4153 - 6 2026-06-30
ENY4095 - 6 2026-07-09
ENY4085 - 6 2026-07-05
ENY3932 Envoy Air 6 2026-06-04
ENY3743 - 6 2026-06-21
ENY3537 Envoy Air 6 2026-06-18
ENY3366 - 6 2026-07-13
ENY3355 - 6 2026-07-07
ENY4235 Envoy Air 5 2026-05-08
ENY4135 - 5 2026-07-05
ENY4116 Envoy Air 5 2026-05-05
ENY4018 Envoy Air 5 2026-05-18
ENY3768 - 5 2026-06-18
ENY3629 - 5 2026-07-07
ENY3550 - 5 2026-07-06
ENY3430 Envoy Air 5 2026-06-04
ENY3428 - 5 2026-07-03
ENY3378 - 5 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ENY3378 - Jul 14, 04:35 UTCJul 14, 05:15 UTC40m
2026-07-14 ENY4133 - Jul 14, 02:40 UTCJul 14, 03:35 UTC55m
2026-07-13 ENY4133 - Jul 13, 23:20 UTCJul 13, 23:55 UTC35m
2026-07-13 ENY3967 - Jul 13, 20:45 UTCJul 13, 22:00 UTC1h 15m
2026-07-13 ENY3967 - Jul 13, 18:50 UTCJul 13, 19:50 UTC1h 0m
2026-07-13 ENY3366 - Jul 13, 16:40 UTCJul 13, 17:30 UTC50m
2026-07-13 ENY3366 ABI → DFW Jul 13, 16:32 UTCJul 13, 17:27 UTC55m
2026-07-13 ENY3366 - Jul 13, 14:50 UTCJul 13, 15:10 UTC20m
2026-07-13 ENY3373 - Jul 13, 11:05 UTCJul 13, 13:20 UTC2h 15m
2026-07-13 ENY3377 - Jul 13, 02:25 UTCJul 13, 03:50 UTC1h 25m
2026-07-12 ENY3771 - Jul 12, 22:05 UTCJul 13, 00:15 UTC2h 10m
2026-07-12 ENY3771 - Jul 12, 19:15 UTCJul 12, 21:05 UTC1h 50m
2026-07-12 ENY3556 - Jul 12, 15:45 UTCJul 12, 17:20 UTC1h 35m
2026-07-12 ENY3556 - Jul 12, 13:30 UTCJul 12, 14:50 UTC1h 20m
2026-07-12 ENY3445 - Jul 12, 11:35 UTCJul 12, 12:01 UTC25m
2026-07-12 ENY3699 - Jul 12, 04:45 UTCJul 12, 05:15 UTC30m
2026-07-12 ENY3699 ORD → MLI Jul 12, 04:45 UTCJul 12, 05:14 UTC29m
2026-07-12 ENY3454 - Jul 12, 00:25 UTCJul 12, 02:30 UTC2h 5m
2026-07-11 ENY3454 - Jul 11, 21:35 UTCJul 11, 23:20 UTC1h 45m
2026-07-11 ENY3414 - Jul 11, 17:10 UTCJul 11, 20:25 UTC3h 15m
2026-07-11 ENY3414 - Jul 11, 13:20 UTCJul 11, 15:45 UTC2h 25m
2026-07-11 ENY4088 - Jul 11, 10:35 UTCJul 11, 11:55 UTC1h 20m
2026-07-11 ENY4101 - Jul 11, 01:05 UTCJul 11, 01:15 UTC10m
2026-07-11 ENY4101 DFW → XNA Jul 11, 01:05 UTCJul 11, 01:52 UTC47m
2026-07-10 ENY3434 - Jul 10, 21:35 UTCJul 10, 23:15 UTC1h 40m
2026-07-10 ENY3434 DFW → BMI Jul 10, 19:05 UTCJul 10, 20:35 UTC1h 30m
2026-07-10 ENY4097 - Jul 10, 16:35 UTCJul 10, 17:40 UTC1h 5m
2026-07-10 ENY4097 BTR → DFW Jul 10, 16:32 UTCJul 10, 17:33 UTC1h 1m
2026-07-10 ENY4097 DFW → BTR Jul 10, 14:45 UTCJul 10, 15:40 UTC55m
2026-07-10 ENY4168 - Jul 10, 12:15 UTCJul 10, 13:20 UTC1h 5m
2026-07-10 ENY4168 CRP → DFW Jul 10, 12:13 UTCJul 10, 13:17 UTC1h 4m
2026-07-10 ENY4173 - Jul 10, 02:20 UTCJul 10, 03:15 UTC55m
2026-07-09 ENY3381 - Jul 9, 23:35 UTCJul 10, 01:10 UTC1h 35m
2026-07-09 ENY3381 ABQ → DFW Jul 9, 23:33 UTCJul 10, 01:05 UTC1h 32m
2026-07-09 ENY3381 DFW → ABQ Jul 9, 21:20 UTCJul 9, 22:40 UTC1h 20m
2026-07-09 ENY4095 AUS → DFW Jul 9, 19:30 UTCJul 9, 20:15 UTC45m
2026-07-09 ENY4095 DFW → AUS Jul 9, 17:30 UTCJul 9, 18:05 UTC35m
2026-07-09 ENY3366 MSN → ORD Jul 9, 15:35 UTCJul 9, 16:05 UTC30m
2026-07-09 ENY3366 MSN → ORD Jul 9, 15:27 UTCJul 9, 16:05 UTC38m
2026-07-09 ENY3366 MSN → ORD Jul 9, 14:05 UTCJul 9, 14:25 UTC20m
2026-07-09 ENY3886 CLT → CVG Jul 9, 10:35 UTCJul 9, 12:45 UTC2h 10m
2026-07-09 ENY3886 CLT → CVG Jul 9, 10:34 UTCJul 9, 12:40 UTC2h 6m
2026-07-09 ENY3876 - Jul 9, 02:50 UTCJul 9, 03:40 UTC50m
2026-07-09 ENY3821 - Jul 9, 00:30 UTCJul 9, 01:35 UTC1h 5m
2026-07-08 ENY3821 - Jul 8, 22:45 UTCJul 8, 23:45 UTC1h 0m
2026-07-08 ENY3465 DOM → MIA Jul 8, 18:29 UTCJul 8, 21:36 UTC3h 7m
2026-07-08 ENY3465 - Jul 8, 14:30 UTCJul 8, 21:40 UTC7h 10m
2026-07-08 ENY3858 - Jul 8, 10:15 UTCJul 8, 11:15 UTC1h 0m
2026-07-08 ENY3858 TLH → MIA Jul 8, 10:14 UTCJul 8, 11:14 UTC1h 0m
2026-07-08 ENY3585 - Jul 8, 02:35 UTCJul 8, 03:35 UTC1h 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 N243NN page for operator, model, and routing details .

Mode-S A23C5D frequently asked

What is Mode-S code A23C5D?
A23C5D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N243NN.
Where is Mode-S A23C5D registered?
Mode-S code A23C5D 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 A23C5D broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23C5D, octal 50436135, decimal 10,632,285.
What flights does A23C5D operate?
Mode-S A23C5D has broadcast 20 distinct callsigns, including ENY4164, ENY3455, ENY4153, ENY4095, ENY4085.