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sensors Mode-S transponder

A1DC2A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N219NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A1DC2A
Octal
50356052
Decimal
10,607,658
Country
US
Tail
N219NN
Type
E75L
Broadcasting now · callsign ENY3668 · 12,900 ft
Flights observed
685
Distinct callsigns
20
Country
US
Last broadcast
14m ago

Current position

A1DC2A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A1DC2A 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
ENY3563 Envoy Air 9 2026-07-02
ENY3781 Envoy Air 8 2026-06-13
ENY3593 - 8 2026-06-19
ENY4220 Envoy Air 7 2026-05-10
ENY4135 Envoy Air 7 2026-05-24
ENY3890 Envoy Air 7 2026-06-15
ENY3794 - 7 2026-06-15
ENY3519 - 7 2026-07-02
ENY3357 - 7 2026-07-06
ENY4168 - 6 2026-07-11
ENY3980 Envoy Air 6 2026-05-05
ENY3880 Envoy Air 6 2026-04-28
ENY3506 Envoy Air 6 2026-06-13
ENY3502 Envoy Air 6 2026-06-05
ENY3389 - 6 2026-07-07
ENY4202 - 5 2026-07-10
ENY4173 - 5 2026-07-11
ENY4150 Envoy Air 5 2026-05-08
ENY4067 Envoy Air 5 2026-06-01
ENY4010 - 5 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 ENY3668 - Jul 15, 10:10 UTCJul 15, 10:30 UTC20m
2026-07-15 ENY4131 - Jul 15, 03:30 UTCJul 15, 04:25 UTC55m
2026-07-15 ENY4131 DCA → BUF Jul 15, 03:28 UTCJul 15, 04:21 UTC53m
2026-07-15 ENY3750 - Jul 15, 01:20 UTCJul 15, 02:15 UTC55m
2026-07-14 ENY3750 - Jul 14, 23:35 UTCJul 15, 00:25 UTC50m
2026-07-14 ENY3462 - Jul 14, 20:40 UTCJul 14, 22:30 UTC1h 50m
2026-07-14 ENY3462 - Jul 14, 15:00 UTCJul 14, 16:40 UTC1h 40m
2026-07-14 ENY3710 - Jul 14, 11:40 UTCJul 14, 13:40 UTC2h 0m
2026-07-14 ENY3685 DCA → DSM Jul 14, 00:35 UTCJul 14, 02:35 UTC2h 0m
2026-07-13 ENY3991 BNA → DCA Jul 13, 20:45 UTCJul 13, 22:05 UTC1h 20m
2026-07-13 ENY3991 BNA → DCA Jul 13, 20:40 UTCJul 13, 22:02 UTC1h 22m
2026-07-13 ENY3991 DCA → BNA Jul 13, 18:15 UTCJul 13, 19:45 UTC1h 30m
2026-07-13 ENY3997 - Jul 13, 15:10 UTCJul 13, 16:30 UTC1h 20m
2026-07-13 ENY3997 HSV → DCA Jul 13, 15:07 UTCJul 13, 16:45 UTC1h 38m
2026-07-13 ENY3997 - Jul 13, 12:45 UTCJul 13, 14:10 UTC1h 25m
2026-07-13 ENY3668 BUF → DCA Jul 13, 10:10 UTCJul 13, 11:00 UTC50m
2026-07-13 ENY3668 BUF → DCA Jul 13, 10:07 UTCJul 13, 11:01 UTC54m
2026-07-13 ENY4131 DCA → BUF Jul 13, 03:05 UTCJul 13, 03:55 UTC50m
2026-07-13 ENY4131 DCA → BUF Jul 13, 03:05 UTCJul 13, 03:53 UTC48m
2026-07-13 ENY3581 - Jul 13, 00:01 UTCJul 13, 01:30 UTC1h 30m
2026-07-12 ENY3581 - Jul 12, 20:55 UTCJul 12, 22:25 UTC1h 30m
2026-07-12 ENY3462 - Jul 12, 17:45 UTCJul 12, 19:35 UTC1h 50m
2026-07-12 ENY3462 - Jul 12, 15:01 UTCJul 12, 16:50 UTC1h 50m
2026-07-12 ENY3630 - Jul 12, 11:20 UTCJul 12, 13:15 UTC1h 55m
2026-07-12 ENY3630 LIT → DCA Jul 12, 11:12 UTCJul 12, 13:10 UTC1h 58m
2026-07-12 ENY3362 - Jul 12, 03:20 UTCJul 12, 04:01 UTC40m
2026-07-11 ENY3936 - Jul 11, 23:40 UTCJul 12, 01:55 UTC2h 15m
2026-07-11 ENY3936 DFW → FAR Jul 11, 19:45 UTCJul 11, 21:55 UTC2h 10m
2026-07-11 ENY3478 - Jul 11, 17:10 UTCJul 11, 18:20 UTC1h 10m
2026-07-11 ENY3478 - Jul 11, 15:00 UTCJul 11, 16:00 UTC1h 0m
2026-07-11 ENY4168 - Jul 11, 12:20 UTCJul 11, 13:20 UTC1h 0m
2026-07-11 ENY4173 - Jul 11, 01:55 UTCJul 11, 02:50 UTC55m
2026-07-11 ENY4173 DFW → CRP Jul 11, 01:53 UTCJul 11, 02:50 UTC57m
2026-07-10 ENY3964 - Jul 10, 23:30 UTCJul 11, 00:35 UTC1h 5m
2026-07-10 ENY3964 - Jul 10, 21:50 UTCJul 10, 22:50 UTC1h 0m
2026-07-10 ENY4202 MTY → DFW Jul 10, 18:40 UTCJul 10, 20:00 UTC1h 20m
2026-07-10 ENY4202 MTY → DFW Jul 10, 18:40 UTCJul 10, 19:56 UTC1h 16m
2026-07-10 ENY4202 - Jul 10, 16:25 UTCJul 10, 17:45 UTC1h 20m
2026-07-10 ENY4100 - Jul 10, 14:05 UTCJul 10, 15:10 UTC1h 5m
2026-07-10 ENY4100 - Jul 10, 12:10 UTCJul 10, 13:05 UTC55m
2026-07-10 ENY3393 - Jul 10, 10:15 UTCJul 10, 10:45 UTC30m
2026-07-10 ENY3349 DFW → ACT Jul 10, 04:20 UTCJul 10, 04:40 UTC20m
2026-07-10 ENY3631 - Jul 10, 02:25 UTCJul 10, 03:15 UTC50m
2026-07-10 ENY3631 LIT → DFW Jul 10, 02:16 UTCJul 10, 03:06 UTC50m
2026-07-09 ENY3627 - Jul 9, 23:35 UTCJul 10, 01:30 UTC1h 55m
2026-07-09 ENY3796 MSP → DCA Jul 9, 18:05 UTCJul 9, 21:05 UTC3h 0m
2026-07-09 ENY3796 MSP → DCA Jul 9, 18:04 UTCJul 9, 21:03 UTC2h 59m
2026-07-09 ENY3796 - Jul 9, 14:40 UTCJul 9, 16:50 UTC2h 10m
2026-07-09 ENY3630 - Jul 9, 11:15 UTCJul 9, 13:05 UTC1h 50m
2026-07-09 ENY3881 - Jul 9, 00:55 UTCJul 9, 01:30 UTC35m

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 N219NN page for operator, model, and routing details .

Mode-S A1DC2A frequently asked

What is Mode-S code A1DC2A?
A1DC2A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N219NN.
Where is Mode-S A1DC2A registered?
Mode-S code A1DC2A 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 A1DC2A broadcasting right now?
Yes. Mode-S A1DC2A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1DC2A, octal 50356052, decimal 10,607,658.
What flights does A1DC2A operate?
Mode-S A1DC2A has broadcast 20 distinct callsigns, including ENY3563, ENY3781, ENY3593, ENY4220, ENY4135.