Apparatus

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sensors Mode-S transponder

A23138

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N240NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A23138
Octal
50430470
Decimal
10,629,432
Country
US
Tail
N240NN
Type
E75L
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
737
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A23138.

Country allocation

The ICAO 24-bit address A23138 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
ENY3554 Envoy Air 9 2026-07-24
ENY3401 Envoy Air 8 2026-07-26
ENY3964 - 6 2026-07-01
ENY3731 - 6 2026-06-18
ENY3687 - 6 2026-07-08
ENY3497 - 6 2026-07-11
ENY3429 - 6 2026-06-28
ENY3428 - 6 2026-07-15
ENY3390 Envoy Air 6 2026-05-12
ENY4230 Envoy Air 5 2026-05-27
ENY4168 Envoy Air 5 2026-07-25
ENY4095 Envoy Air 5 2026-05-20
ENY4008 Envoy Air 5 2026-07-25
ENY3993 Envoy Air 5 2026-04-29
ENY3978 Envoy Air 5 2026-06-05
ENY3904 Envoy Air 5 2026-04-28
ENY3827 Envoy Air 5 2026-05-02
ENY3802 Envoy Air 5 2026-04-20
ENY3729 - 5 2026-06-23
ENY3701 Envoy Air 5 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3461 AUS → TUL Jul 26, 21:05 UTCJul 26, 22:00 UTC55m
2026-07-26 ENY3794 LIT → DFW Jul 26, 17:55 UTCJul 26, 18:55 UTC1h 0m
2026-07-26 ENY3794 LIT → DFW Jul 26, 17:54 UTCJul 26, 18:50 UTC56m
2026-07-26 ENY3794 LIT → DFW Jul 26, 15:55 UTCJul 26, 16:55 UTC1h 0m
2026-07-26 ENY3401 STS → DFW Jul 26, 13:40 UTCJul 26, 14:25 UTC45m
2026-07-26 ENY3401 STS → DFW Jul 26, 12:05 UTCJul 26, 12:40 UTC35m
2026-07-26 ENY4186 ORD → RDU Jul 26, 10:10 UTCJul 26, 10:35 UTC25m
2026-07-26 ENY4186 ORD → RDU Jul 26, 10:08 UTCJul 26, 10:39 UTC31m
2026-07-26 ENY4166 FWA → ORD Jul 26, 04:05 UTCJul 26, 04:25 UTC20m
2026-07-26 ENY4166 FWA → ORD Jul 26, 04:02 UTCJul 26, 04:25 UTC23m
2026-07-25 ENY4008 PHX → SMF Jul 25, 23:00 UTCJul 25, 23:45 UTC45m
2026-07-25 ENY4008 PHX → SMF Jul 25, 22:49 UTCJul 25, 23:38 UTC49m
2026-07-25 ENY4008 PHX → SMF Jul 25, 20:55 UTCJul 25, 21:40 UTC45m
2026-07-25 ENY3994 DFW → LCH Jul 25, 17:40 UTCJul 25, 19:30 UTC1h 50m
2026-07-25 ENY3994 DFW → LCH Jul 25, 14:50 UTCJul 25, 16:40 UTC1h 50m
2026-07-25 ENY4168 CRP → DFW Jul 25, 12:45 UTCJul 25, 13:40 UTC55m
2026-07-25 ENY4173 DFW → CRP Jul 25, 01:55 UTCJul 25, 02:50 UTC55m
2026-07-24 ENY4133 BNA → DCA Jul 24, 23:55 UTCJul 25, 00:35 UTC40m
2026-07-24 ENY4133 BNA → DCA Jul 24, 22:05 UTCJul 24, 22:50 UTC45m
2026-07-24 ENY3554 CVG → MIA Jul 24, 18:25 UTCJul 24, 20:40 UTC2h 15m
2026-07-24 ENY3554 CVG → MIA Jul 24, 15:05 UTCJul 24, 17:10 UTC2h 5m
2026-07-24 ENY3373 MHK → DFW Jul 24, 11:15 UTCJul 24, 13:30 UTC2h 15m
2026-07-24 ENY3377 BUF → ORD Jul 24, 02:25 UTCJul 24, 03:55 UTC1h 30m
2026-07-23 ENY3980 ABQ → ORD Jul 23, 22:30 UTCJul 23, 23:20 UTC50m
2026-07-23 ENY3980 ABQ → ORD Jul 23, 22:28 UTCJul 23, 23:15 UTC47m
2026-07-23 ENY3980 ABQ → ORD Jul 23, 20:45 UTCJul 23, 21:30 UTC45m
2026-07-23 ENY3733 ORD → ABE Jul 23, 17:15 UTCJul 23, 19:10 UTC1h 55m
2026-07-23 ENY3733 ORD → ABE Jul 23, 14:15 UTCJul 23, 15:50 UTC1h 35m
2026-07-23 ENY3445 - Jul 23, 11:25 UTCJul 23, 11:50 UTC25m
2026-07-23 ENY3445 MLI → ORD Jul 23, 11:19 UTCJul 23, 11:48 UTC29m
2026-07-23 ENY3699 ORD → SPI Jul 23, 04:45 UTCJul 23, 05:05 UTC20m
2026-07-23 ENY3699 ORD → SPI Jul 23, 04:40 UTCJul 23, 05:08 UTC28m
2026-07-23 ENY4176 XNA → MIA Jul 23, 00:00 UTCJul 23, 02:15 UTC2h 15m
2026-07-22 ENY4176 XNA → MIA Jul 22, 20:25 UTCJul 22, 22:30 UTC2h 5m
2026-07-22 ENY4153 STL → ORD Jul 22, 16:25 UTCJul 22, 18:25 UTC2h 0m
2026-07-22 ENY4153 STL → ORD Jul 22, 13:40 UTCJul 22, 15:15 UTC1h 35m
2026-07-22 ENY4041 ROC → DCA Jul 22, 11:15 UTCJul 22, 12:05 UTC50m
2026-07-22 ENY4041 ROC → DCA Jul 22, 10:56 UTCJul 22, 11:55 UTC59m
2026-07-21 ENY3550 CVG → ORD Jul 21, 01:55 UTCJul 21, 04:05 UTC2h 10m
2026-07-20 ENY3782 PVD → ORD Jul 20, 23:25 UTCJul 21, 00:00 UTC34m
2026-07-20 ENY3782 PVD → ORD Jul 20, 23:22 UTCJul 21, 00:31 UTC1h 9m
2026-07-20 ENY3782 PVD → ORD Jul 20, 21:25 UTCJul 20, 22:35 UTC1h 10m
2026-07-20 ENY3518 - Jul 20, 18:10 UTCJul 20, 18:35 UTC25m
2026-07-20 ENY3518 EYW → MIA Jul 20, 18:03 UTCJul 20, 18:31 UTC28m
2026-07-20 ENY3518 - Jul 20, 16:25 UTCJul 20, 16:45 UTC20m
2026-07-20 ENY4139 MIA → RDU Jul 20, 14:45 UTCJul 20, 15:15 UTC30m
2026-07-20 ENY4139 MIA → RDU Jul 20, 14:42 UTCJul 20, 15:15 UTC33m
2026-07-20 ENY4071 MIA → SRQ Jul 20, 13:20 UTCJul 20, 14:00 UTC40m
2026-07-20 ENY3662 MSN → AUS Jul 20, 09:25 UTCJul 20, 11:35 UTC2h 10m
2026-07-19 ENY3540 CMH → MIA Jul 19, 22:10 UTCJul 19, 23:20 UTC1h 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 N240NN page for operator, model, and routing details .

Mode-S A23138 frequently asked

What is Mode-S code A23138?
A23138 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N240NN.
Where is Mode-S A23138 registered?
Mode-S code A23138 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 A23138 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23138, octal 50430470, decimal 10,629,432.
What flights does A23138 operate?
Mode-S A23138 has broadcast 20 distinct callsigns, including ENY3554, ENY3401, ENY3964, ENY3731, ENY3687.