Apparatus

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sensors Mode-S transponder

A20C44

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N231AN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A20C44
Octal
50406104
Decimal
10,619,972
Country
US
Tail
N231AN
Type
E75L
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
776
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A20C44.

Country allocation

The ICAO 24-bit address A20C44 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
ENY4192 - 10 2026-07-06
ENY3441 Envoy Air 9 2026-07-25
ENY4023 - 8 2026-07-09
ENY3946 Envoy Air 8 2026-05-30
ENY3691 Envoy Air 8 2026-07-26
ENY3689 - 8 2026-06-20
ENY3616 Envoy Air 8 2026-07-25
ENY4010 Envoy Air 7 2026-07-23
ENY3968 - 7 2026-07-14
ENY4239 Envoy Air 6 2026-05-15
ENY4126 Envoy Air 6 2026-06-17
ENY3956 Envoy Air 6 2026-07-25
ENY3768 - 6 2026-07-17
ENY3665 - 6 2026-07-16
ENY3615 Envoy Air 6 2026-07-26
ENY3389 - 6 2026-07-18
ENY4114 Envoy Air 5 2026-06-16
ENY4104 - 5 2026-06-21
ENY4040 Envoy Air 5 2026-07-22
ENY4027 - 5 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3691 DFW → AGU Jul 26, 22:20 UTCJul 26, 23:00 UTC40m
2026-07-26 ENY3618 AUS → IND Jul 26, 20:25 UTCJul 26, 21:10 UTC45m
2026-07-26 ENY3618 AUS → IND Jul 26, 18:30 UTCJul 26, 19:10 UTC40m
2026-07-26 ENY3788 CWA → ORD Jul 26, 15:35 UTCJul 26, 17:15 UTC1h 40m
2026-07-26 ENY3788 CWA → ORD Jul 26, 12:40 UTCJul 26, 14:30 UTC1h 50m
2026-07-26 ENY3617 SDF → ORD Jul 26, 10:15 UTCJul 26, 11:00 UTC45m
2026-07-26 ENY3615 ICT → ORD Jul 26, 04:10 UTCJul 26, 04:40 UTC30m
2026-07-26 ENY3890 CVG → CLT Jul 26, 00:55 UTCJul 26, 02:00 UTC1h 5m
2026-07-25 ENY3890 CVG → CLT Jul 25, 22:40 UTCJul 25, 23:45 UTC1h 5m
2026-07-25 ENY3441 GSP → MIA Jul 25, 20:00 UTCJul 25, 21:10 UTC1h 10m
2026-07-25 ENY3441 GSP → MIA Jul 25, 17:40 UTCJul 25, 18:35 UTC55m
2026-07-25 ENY3616 DFW → HRL Jul 25, 15:50 UTCJul 25, 16:30 UTC40m
2026-07-25 ENY3616 DFW → HRL Jul 25, 15:34 UTCJul 25, 16:25 UTC51m
2026-07-25 ENY3616 DFW → HRL Jul 25, 13:50 UTCJul 25, 14:35 UTC45m
2026-07-25 ENY3956 ORD → CVG Jul 25, 11:10 UTCJul 25, 12:10 UTC1h 0m
2026-07-25 ENY3956 ORD → CVG Jul 25, 11:02 UTCJul 25, 12:04 UTC1h 2m
2026-07-25 ENY3928 ORD → RDU Jul 25, 03:55 UTCJul 25, 04:50 UTC55m
2026-07-25 ENY3890 CVG → CLT Jul 25, 00:50 UTCJul 25, 02:00 UTC1h 10m
2026-07-25 ENY3890 CVG → CLT Jul 25, 00:42 UTCJul 25, 01:58 UTC1h 16m
2026-07-24 ENY3890 CVG → CLT Jul 24, 22:25 UTCJul 24, 23:25 UTC1h 0m
2026-07-24 ENY3618 AUS → IND Jul 24, 20:20 UTCJul 24, 21:00 UTC40m
2026-07-24 ENY3618 AUS → IND Jul 24, 20:13 UTCJul 24, 21:00 UTC47m
2026-07-24 ENY3618 AUS → IND Jul 24, 18:30 UTCJul 24, 19:20 UTC50m
2026-07-24 ENY3503 YYZ → ORD Jul 24, 15:20 UTCJul 24, 17:00 UTC1h 40m
2026-07-24 ENY3503 YYZ → ORD Jul 24, 15:19 UTCJul 24, 16:55 UTC1h 36m
2026-07-24 ENY3503 YYZ → ORD Jul 24, 12:50 UTCJul 24, 14:30 UTC1h 40m
2026-07-24 ENY3843 CVG → DFW Jul 24, 02:15 UTCJul 24, 03:00 UTC45m
2026-07-23 ENY3843 CVG → DFW Jul 23, 23:45 UTCJul 24, 00:35 UTC50m
2026-07-23 ENY3387 MSY → MIA Jul 23, 21:35 UTCJul 23, 22:20 UTC45m
2026-07-23 ENY3387 MSY → MIA Jul 23, 19:45 UTCJul 23, 20:25 UTC40m
2026-07-23 ENY4010 BOS → ORD Jul 23, 17:05 UTCJul 23, 18:00 UTC55m
2026-07-23 ENY4010 BOS → ORD Jul 23, 15:00 UTCJul 23, 15:55 UTC55m
2026-07-23 ENY4010 BOS → ORD Jul 23, 14:56 UTCJul 23, 16:04 UTC1h 8m
2026-07-23 ENY4027 - Jul 23, 11:55 UTCJul 23, 13:15 UTC1h 20m
2026-07-23 ENY4026 DFW → TRC Jul 23, 02:25 UTCJul 23, 03:35 UTC1h 10m
2026-07-22 ENY3382 MSY → DCA Jul 22, 23:20 UTCJul 22, 23:40 UTC20m
2026-07-22 ENY3382 MSY → DCA Jul 22, 22:05 UTCJul 22, 22:35 UTC30m
2026-07-22 ENY4040 ORD → PIT Jul 22, 20:00 UTCJul 22, 20:25 UTC25m
2026-07-22 ENY4040 ORD → PIT Jul 22, 18:25 UTCJul 22, 18:40 UTC15m
2026-07-21 ENY9871 - Jul 21, 21:25 UTCJul 21, 22:25 UTC1h 0m
2026-07-21 ENY4173 - Jul 21, 01:55 UTCJul 21, 02:50 UTC55m
2026-07-20 ENY3507 DFW → STS Jul 20, 22:30 UTCJul 20, 23:55 UTC1h 25m
2026-07-20 ENY3507 DFW → STS Jul 20, 20:15 UTCJul 20, 21:40 UTC1h 25m
2026-07-20 ENY3778 BOS → CMH Jul 20, 18:25 UTCJul 20, 19:15 UTC50m
2026-07-20 ENY3778 BOS → CMH Jul 20, 15:50 UTCJul 20, 16:35 UTC45m
2026-07-20 ENY3624 SGF → DFW Jul 20, 13:25 UTCJul 20, 14:20 UTC55m
2026-07-20 ENY4017 CLT → SGF Jul 20, 00:35 UTCJul 20, 02:10 UTC1h 35m
2026-07-19 ENY3519 - Jul 19, 20:55 UTCJul 19, 22:35 UTC1h 40m
2026-07-19 ENY3519 - Jul 19, 18:10 UTCJul 19, 19:50 UTC1h 40m
2026-07-19 ENY3563 BOS → IND Jul 19, 16:15 UTCJul 19, 16:55 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 N231AN page for operator, model, and routing details .

Mode-S A20C44 frequently asked

What is Mode-S code A20C44?
A20C44 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N231AN.
Where is Mode-S A20C44 registered?
Mode-S code A20C44 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 A20C44 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A20C44, octal 50406104, decimal 10,619,972.
What flights does A20C44 operate?
Mode-S A20C44 has broadcast 20 distinct callsigns, including ENY4192, ENY3441, ENY4023, ENY3946, ENY3691.