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
Broadcasting now · callsign ENY4002 · 11,925 ft
Flights observed
782
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:40 UTC

Current position

A2AF23 is currently broadcasting. Map zoomed to live position.

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
ENY3636 - 8 2026-07-17
ENY3468 - 8 2026-07-17
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
ENY3368 - 6 2026-06-21
ENY4152 Envoy Air 5 2026-06-07
ENY3990 Envoy Air 5 2026-06-02
ENY3968 Envoy Air 5 2026-07-24
ENY3964 - 5 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY4035 CMH → DCA Jul 26, 22:00 UTCJul 26, 22:40 UTC40m
2026-07-26 ENY3793 TLH → DCA Jul 26, 18:35 UTCJul 26, 21:05 UTC2h 30m
2026-07-26 ENY3793 TLH → DCA Jul 26, 14:35 UTCJul 26, 17:10 UTC2h 35m
2026-07-26 ENY3882 BDL → MIA Jul 26, 11:55 UTCJul 26, 13:02 UTC1h 7m
2026-07-26 ENY3895 SGF → ORD Jul 26, 02:50 UTCJul 26, 12:45 UTC9h 56m
2026-07-25 ENY3458 IND → ORD Jul 25, 23:55 UTCJul 26, 00:45 UTC50m
2026-07-25 ENY3458 IND → ORD Jul 25, 23:54 UTCJul 26, 00:39 UTC45m
2026-07-25 ENY3458 IND → ORD Jul 25, 22:10 UTCJul 25, 22:45 UTC35m
2026-07-25 ENY3414 DTW → ORD Jul 25, 17:05 UTCJul 25, 19:55 UTC2h 50m
2026-07-25 ENY3414 DTW → ORD Jul 25, 13:10 UTCJul 25, 15:40 UTC2h 30m
2026-07-25 ENY4107 FAR → ORD Jul 25, 10:05 UTCJul 25, 11:20 UTC1h 15m
2026-07-25 ENY4107 FAR → ORD Jul 25, 10:02 UTCJul 25, 11:16 UTC1h 14m
2026-07-25 ENY3450 SDF → BOS Jul 25, 02:45 UTCJul 25, 05:00 UTC2h 15m
2026-07-25 ENY3443 BOS → CMH Jul 25, 00:25 UTCJul 25, 01:45 UTC1h 20m
2026-07-24 ENY3443 BOS → CMH Jul 24, 21:35 UTCJul 24, 22:40 UTC1h 5m
2026-07-24 ENY3652 ORD → MCI Jul 24, 19:45 UTCJul 24, 20:35 UTC50m
2026-07-24 ENY3652 ORD → MCI Jul 24, 19:38 UTCJul 24, 20:36 UTC58m
2026-07-24 ENY3652 ORD → MCI Jul 24, 17:55 UTCJul 24, 18:45 UTC50m
2026-07-24 ENY3968 MSY → DFW Jul 24, 16:10 UTCJul 24, 17:00 UTC50m
2026-07-24 ENY3968 MSY → DFW Jul 24, 15:59 UTCJul 24, 16:51 UTC52m
2026-07-24 ENY3968 MSY → DFW Jul 24, 14:10 UTCJul 24, 14:50 UTC40m
2026-07-24 ENY3614 PHX → SJC Jul 24, 12:05 UTCJul 24, 12:45 UTC40m
2026-07-24 ENY3614 PHX → SJC Jul 24, 12:02 UTCJul 24, 12:49 UTC47m
2026-07-24 ENY3693 DFW → XNA Jul 24, 03:40 UTCJul 24, 04:35 UTC55m
2026-07-24 ENY3727 CMH → BOS Jul 24, 01:30 UTCJul 24, 02:05 UTC35m
2026-07-24 ENY3727 CMH → BOS Jul 24, 01:26 UTCJul 24, 01:59 UTC33m
2026-07-23 ENY3727 CMH → BOS Jul 23, 23:45 UTCJul 24, 00:30 UTC45m
2026-07-23 ENY3777 MCI → DFW Jul 23, 21:30 UTCJul 23, 22:20 UTC50m
2026-07-23 ENY3777 MCI → DFW Jul 23, 21:29 UTCJul 23, 22:14 UTC45m
2026-07-23 ENY3777 MCI → DFW Jul 23, 20:00 UTCJul 23, 20:40 UTC40m
2026-07-23 ENY3577 DFW → LRD Jul 23, 17:15 UTCJul 23, 18:35 UTC1h 20m
2026-07-23 ENY3577 DFW → LRD Jul 23, 17:10 UTCJul 23, 18:36 UTC1h 26m
2026-07-23 ENY3577 DFW → LRD Jul 23, 14:55 UTCJul 23, 16:15 UTC1h 20m
2026-07-23 ENY4024 - Jul 23, 10:45 UTCJul 23, 13:00 UTC2h 15m
2026-07-23 ENY4024 MYR → DFW Jul 23, 10:35 UTCJul 23, 12:51 UTC2h 16m
2026-07-23 ENY4019 LTO → PHX Jul 23, 00:45 UTCJul 23, 02:50 UTC2h 5m
2026-07-22 ENY3853 - Jul 22, 20:15 UTCJul 22, 22:35 UTC2h 20m
2026-07-22 ENY3853 ACA → DFW Jul 22, 20:04 UTCJul 22, 22:29 UTC2h 25m
2026-07-22 ENY3852 GRB → ORD Jul 22, 16:00 UTCJul 22, 18:10 UTC2h 10m
2026-07-22 ENY4073 CMI → DFW Jul 22, 12:40 UTCJul 22, 14:15 UTC1h 35m
2026-07-22 ENY4073 CMI → DFW Jul 22, 12:35 UTCJul 22, 14:09 UTC1h 34m
2026-07-21 ENY3694 - Jul 21, 01:15 UTCJul 21, 01:40 UTC25m
2026-07-20 ENY3819 MSY → AUS Jul 20, 21:40 UTCJul 20, 23:40 UTC2h 0m
2026-07-20 ENY3819 MSY → AUS Jul 20, 19:20 UTCJul 20, 20:35 UTC1h 15m
2026-07-20 ENY9867 - Jul 20, 15:20 UTCJul 20, 17:05 UTC1h 45m
2026-07-18 ENY3450 - Jul 18, 02:29 UTCJul 18, 04:35 UTC2h 6m
2026-07-17 ENY3677 - Jul 17, 23:45 UTCJul 18, 00:50 UTC1h 5m
2026-07-17 ENY3677 - Jul 17, 21:34 UTCJul 17, 22:40 UTC1h 5m
2026-07-17 ENY3636 - Jul 17, 19:15 UTCJul 17, 19:55 UTC40m
2026-07-17 ENY3636 LIT → DFW Jul 17, 19:06 UTCJul 17, 19:54 UTC48m

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?
Yes. Mode-S A2AF23 is currently airborne.
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.