Apparatus

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sensors Mode-S transponder

A2AF23

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N272NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A2AF23
Octal
50527443
Decimal
10,661,667
Country
US
Tail
N272NN
Type
E75L
No current signal · last broadcast 4h ago
Flights observed
706
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A2AF23.

Country allocation

The ICAO 24-bit address A2AF23 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
ENY3422 Envoy Air 13 2026-06-02
ENY4146 Envoy Air 12 2026-06-02
ENY4224 Envoy Air 11 2026-05-12
ENY3539 - 10 2026-07-13
ENY4006 Envoy Air 9 2026-06-02
ENY3461 Envoy Air 8 2026-06-21
ENY3351 Envoy Air 8 2026-06-05
ENY4214 Envoy Air 7 2026-06-19
ENY3890 - 7 2026-07-13
ENY3551 - 7 2026-07-11
ENY3339 - 7 2026-07-04
ENY4198 Envoy Air 6 2026-05-12
ENY4178 Envoy Air 6 2026-06-03
ENY3468 - 6 2026-06-25
ENY3368 - 6 2026-06-21
ENY4152 Envoy Air 5 2026-06-07
ENY3990 Envoy Air 5 2026-06-02
ENY3964 - 5 2026-07-05
ENY3788 - 5 2026-07-12
ENY3636 Envoy Air 5 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ENY3787 - Jul 14, 03:05 UTCJul 14, 04:15 UTC1h 10m
2026-07-14 ENY3787 - Jul 14, 00:50 UTCJul 14, 01:55 UTC1h 5m
2026-07-13 ENY3840 - Jul 13, 22:05 UTCJul 13, 22:55 UTC50m
2026-07-13 ENY3840 XNA → DFW Jul 13, 22:04 UTCJul 13, 22:56 UTC52m
2026-07-13 ENY3840 DFW → XNA Jul 13, 20:10 UTCJul 13, 21:10 UTC1h 0m
2026-07-13 ENY3539 - Jul 13, 16:45 UTCJul 13, 18:15 UTC1h 30m
2026-07-13 ENY3539 GPT → DFW Jul 13, 16:40 UTCJul 13, 18:02 UTC1h 22m
2026-07-13 ENY3539 - Jul 13, 14:30 UTCJul 13, 15:40 UTC1h 10m
2026-07-13 ENY3360 LFT → DFW Jul 13, 11:17 UTCJul 13, 12:27 UTC1h 10m
2026-07-13 ENY3359 - Jul 13, 05:45 UTCJul 13, 06:35 UTC50m
2026-07-13 ENY3890 - Jul 13, 02:55 UTCJul 13, 04:05 UTC1h 10m
2026-07-13 ENY3890 COU → DFW Jul 13, 02:50 UTCJul 13, 04:04 UTC1h 14m
2026-07-12 ENY3890 - Jul 12, 23:40 UTCJul 13, 00:35 UTC55m
2026-07-12 ENY3618 - Jul 12, 20:25 UTCJul 12, 21:25 UTC1h 0m
2026-07-12 ENY3618 - Jul 12, 18:30 UTCJul 12, 19:15 UTC45m
2026-07-12 ENY3788 - Jul 12, 15:15 UTCJul 12, 17:05 UTC1h 50m
2026-07-12 ENY3788 DFW → SDF Jul 12, 12:45 UTCJul 12, 14:25 UTC1h 40m
2026-07-12 ENY3617 - Jul 12, 10:15 UTCJul 12, 11:05 UTC50m
2026-07-12 ENY3617 LBB → DFW Jul 12, 10:14 UTCJul 12, 11:00 UTC46m
2026-07-12 ENY3615 DFW → LBB Jul 12, 04:01 UTCJul 12, 04:45 UTC45m
2026-07-12 ENY3615 DFW → LBB Jul 12, 03:57 UTCJul 12, 04:41 UTC44m
2026-07-12 ENY3484 - Jul 12, 01:15 UTCJul 12, 02:20 UTC1h 5m
2026-07-12 ENY3484 CRP → DFW Jul 12, 01:14 UTCJul 12, 02:15 UTC1h 1m
2026-07-11 ENY3484 - Jul 11, 23:25 UTCJul 12, 00:20 UTC55m
2026-07-11 ENY3721 MSY → DFW Jul 11, 20:45 UTCJul 11, 22:01 UTC1h 15m
2026-07-11 ENY3721 DFW → MSY Jul 11, 17:55 UTCJul 11, 19:40 UTC1h 45m
2026-07-11 ENY3551 - Jul 11, 15:15 UTCJul 11, 15:50 UTC35m
2026-07-11 ENY3551 GRK → DFW Jul 11, 15:15 UTCJul 11, 15:50 UTC35m
2026-07-11 ENY3551 - Jul 11, 13:50 UTCJul 11, 14:10 UTC20m
2026-07-11 ENY3956 - Jul 11, 11:10 UTCJul 11, 12:40 UTC1h 30m
2026-07-11 ENY3928 DFW → MHK Jul 11, 05:33 UTCJul 11, 06:45 UTC1h 12m
2026-07-11 ENY3928 - Jul 11, 05:35 UTCJul 11, 06:40 UTC1h 5m
2026-07-11 ENY3883 - Jul 11, 02:45 UTCJul 11, 04:05 UTC1h 20m
2026-07-11 ENY3883 - Jul 11, 01:00 UTCJul 11, 02:00 UTC1h 0m
2026-07-10 ENY3697 - Jul 10, 22:00 UTCJul 10, 23:50 UTC1h 50m
2026-07-10 ENY3875 - Jul 10, 19:15 UTCJul 10, 20:45 UTC1h 30m
2026-07-10 ENY3478 - Jul 10, 16:55 UTCJul 10, 18:00 UTC1h 5m
2026-07-10 ENY3478 - Jul 10, 14:35 UTCJul 10, 15:45 UTC1h 10m
2026-07-10 ENY3673 ATW → DFW Jul 10, 11:10 UTCJul 10, 13:20 UTC2h 10m
2026-07-10 ENY4188 DFW → ATW Jul 10, 01:40 UTCJul 10, 03:45 UTC2h 5m
2026-07-10 ENY4188 DFW → ATW Jul 10, 01:40 UTCJul 10, 03:44 UTC2h 4m
2026-07-09 ENY4125 - Jul 9, 21:40 UTCJul 10, 00:40 UTC3h 0m
2026-07-09 ENY4125 - Jul 9, 17:50 UTCJul 9, 20:35 UTC2h 45m
2026-07-09 ENY3495 - Jul 9, 14:45 UTCJul 9, 16:25 UTC1h 40m
2026-07-09 ENY3495 DFW → DSM Jul 9, 12:25 UTCJul 9, 13:55 UTC1h 30m
2026-07-09 ENY3654 FAR → ORD Jul 9, 10:10 UTCJul 9, 10:45 UTC35m
2026-07-09 ENY3654 FAR → ORD Jul 9, 10:09 UTCJul 9, 10:48 UTC39m
2026-07-09 ENY3431 DFW → CLL Jul 9, 04:12 UTCJul 9, 04:44 UTC32m
2026-07-09 ENY3431 DFW → CLL Jul 9, 04:15 UTCJul 9, 04:45 UTC30m
2026-07-09 ENY3381 - Jul 9, 00:45 UTCJul 9, 02:30 UTC1h 45m

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 N272NN page for operator, model, and routing details .

Mode-S A2AF23 frequently asked

What is Mode-S code A2AF23?
A2AF23 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N272NN.
Where is Mode-S A2AF23 registered?
Mode-S code A2AF23 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 A2AF23 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2AF23, octal 50527443, decimal 10,661,667.
What flights does A2AF23 operate?
Mode-S A2AF23 has broadcast 20 distinct callsigns, including ENY3422, ENY4146, ENY4224, ENY3539, ENY4006.