Apparatus

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sensors Mode-S transponder

A234EF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N241NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A234EF
Octal
50432357
Decimal
10,630,383
Country
US
Tail
N241NN
Type
E75L
No current signal · last broadcast Jul 26, 20:35 UTC
Flights observed
799
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S A234EF.

Country allocation

The ICAO 24-bit address A234EF 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
ENY3678 Envoy Air 8 2026-07-25
ENY4155 - 7 2026-07-03
ENY3563 Envoy Air 7 2026-06-29
ENY3555 - 7 2026-07-12
ENY3503 Envoy Air 7 2026-05-27
ENY4314 - 6 2026-07-15
ENY3820 - 6 2026-07-15
ENY3819 - 6 2026-06-19
ENY3796 Envoy Air 6 2026-07-24
ENY3729 Envoy Air 6 2026-06-05
ENY3519 - 6 2026-06-29
ENY4202 Envoy Air 5 2026-05-25
ENY4188 Envoy Air 5 2026-06-03
ENY4181 Envoy Air 5 2026-04-27
ENY4125 - 5 2026-06-25
ENY4040 Envoy Air 5 2026-05-27
ENY4008 - 5 2026-07-09
ENY3997 Envoy Air 5 2026-07-22
ENY3994 - 5 2026-07-09
ENY3991 Envoy Air 5 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY4130 CLE → ORD Jul 26, 19:55 UTCJul 26, 20:35 UTC40m
2026-07-26 ENY4130 CLE → ORD Jul 26, 18:35 UTCJul 26, 19:05 UTC30m
2026-07-26 ENY3968 MSY → DFW Jul 26, 15:55 UTCJul 26, 16:40 UTC45m
2026-07-26 ENY3968 MSY → DFW Jul 26, 14:05 UTCJul 26, 14:45 UTC40m
2026-07-26 ENY4119 GRR → DFW Jul 26, 12:05 UTCJul 26, 12:55 UTC50m
2026-07-26 ENY3378 ORD → CLE Jul 26, 02:05 UTCJul 26, 02:45 UTC40m
2026-07-26 ENY3378 ORD → CLE Jul 26, 02:00 UTCJul 26, 02:44 UTC44m
2026-07-25 ENY3678 ABQ → AUS Jul 25, 22:30 UTCJul 25, 23:30 UTC1h 0m
2026-07-25 ENY3678 ABQ → AUS Jul 25, 22:24 UTCJul 25, 23:29 UTC1h 5m
2026-07-25 ENY3678 ABQ → AUS Jul 25, 20:25 UTCJul 25, 21:35 UTC1h 10m
2026-07-25 ENY3631 ORD → ALB Jul 25, 01:55 UTCJul 25, 02:40 UTC45m
2026-07-24 ENY3627 DCA → LIT Jul 24, 22:55 UTCJul 25, 00:50 UTC1h 55m
2026-07-24 ENY3796 ORD → ATW Jul 24, 18:00 UTCJul 24, 19:50 UTC1h 50m
2026-07-24 ENY3796 ORD → ATW Jul 24, 17:59 UTCJul 24, 19:49 UTC1h 50m
2026-07-24 ENY3796 ORD → ATW Jul 24, 15:00 UTCJul 24, 17:10 UTC2h 10m
2026-07-24 ENY3796 ORD → ATW Jul 24, 14:55 UTCJul 24, 17:10 UTC2h 15m
2026-07-24 ENY3630 LIT → DCA Jul 24, 11:15 UTCJul 24, 13:10 UTC1h 55m
2026-07-24 ENY3630 LIT → DCA Jul 24, 11:08 UTCJul 24, 13:03 UTC1h 55m
2026-07-24 ENY3362 PHX → STS Jul 24, 03:15 UTCJul 24, 03:50 UTC35m
2026-07-24 ENY3631 ORD → ALB Jul 24, 00:55 UTCJul 24, 01:40 UTC45m
2026-07-23 ENY3627 DCA → LIT Jul 23, 21:50 UTCJul 23, 23:45 UTC1h 55m
2026-07-23 ENY3627 DCA → LIT Jul 23, 21:46 UTCJul 23, 23:45 UTC1h 59m
2026-07-23 ENY3796 ORD → ATW Jul 23, 18:55 UTCJul 23, 20:45 UTC1h 50m
2026-07-23 ENY3796 ORD → ATW Jul 23, 15:35 UTCJul 23, 17:55 UTC2h 20m
2026-07-23 ENY3710 ORD → BOS Jul 23, 11:40 UTCJul 23, 13:30 UTC1h 50m
2026-07-23 ENY3685 ELP → AUS Jul 23, 01:14 UTCJul 23, 03:26 UTC2h 12m
2026-07-23 ENY3685 ELP → AUS Jul 23, 01:15 UTCJul 23, 03:35 UTC2h 20m
2026-07-22 ENY3991 CLT → ATW Jul 22, 21:25 UTCJul 22, 22:45 UTC1h 20m
2026-07-22 ENY3991 CLT → ATW Jul 22, 18:50 UTCJul 22, 20:30 UTC1h 40m
2026-07-22 ENY3997 TYS → DCA Jul 22, 16:15 UTCJul 22, 17:50 UTC1h 35m
2026-07-22 ENY3997 TYS → DCA Jul 22, 13:50 UTCJul 22, 15:25 UTC1h 35m
2026-07-22 ENY4056 DFW → OKC Jul 22, 11:10 UTCJul 22, 11:25 UTC15m
2026-07-22 ENY4056 DFW → OKC Jul 22, 10:08 UTCJul 22, 11:09 UTC1h 1m
2026-07-22 ENY9874 ORD → DFW Jul 22, 01:15 UTCJul 22, 02:10 UTC55m
2026-07-21 ENY4138 - Jul 21, 16:30 UTCJul 21, 18:10 UTC1h 40m
2026-07-21 ENY3824 - Jul 21, 12:15 UTCJul 21, 14:20 UTC2h 5m
2026-07-21 ENY3824 XNA → DCA Jul 21, 12:13 UTCJul 21, 14:15 UTC2h 2m
2026-07-21 ENY3452 - Jul 21, 00:15 UTCJul 21, 02:25 UTC2h 10m
2026-07-20 ENY3991 CLT → ATW Jul 20, 20:40 UTCJul 20, 22:00 UTC1h 20m
2026-07-20 ENY3991 CLT → ATW Jul 20, 20:39 UTCJul 20, 22:00 UTC1h 21m
2026-07-20 ENY3991 CLT → ATW Jul 20, 18:00 UTCJul 20, 19:20 UTC1h 20m
2026-07-20 ENY3997 TYS → DCA Jul 20, 15:20 UTCJul 20, 17:00 UTC1h 40m
2026-07-20 ENY3997 TYS → DCA Jul 20, 15:18 UTCJul 20, 16:57 UTC1h 39m
2026-07-20 ENY3997 TYS → DCA Jul 20, 12:55 UTCJul 20, 14:20 UTC1h 25m
2026-07-20 ENY4056 DFW → OKC Jul 20, 10:10 UTCJul 20, 11:00 UTC50m
2026-07-20 ENY3975 - Jul 20, 03:25 UTCJul 20, 04:10 UTC45m
2026-07-20 ENY4047 BOS → DCA Jul 20, 00:45 UTCJul 20, 02:00 UTC1h 15m
2026-07-19 ENY3438 DFW → HRL Jul 19, 21:40 UTCJul 19, 23:35 UTC1h 55m
2026-07-19 ENY3438 DFW → HRL Jul 19, 21:38 UTCJul 19, 23:34 UTC1h 56m
2026-07-19 ENY3438 DFW → HRL Jul 19, 18:25 UTCJul 19, 20:35 UTC2h 10m

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 N241NN page for operator, model, and routing details .

Mode-S A234EF frequently asked

What is Mode-S code A234EF?
A234EF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N241NN.
Where is Mode-S A234EF registered?
Mode-S code A234EF 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 A234EF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A234EF, octal 50432357, decimal 10,630,383.
What flights does A234EF operate?
Mode-S A234EF has broadcast 20 distinct callsigns, including ENY3678, ENY4155, ENY3563, ENY3555, ENY3503.