Apparatus

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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 ENY3854 · 24,000 ft
Flights observed
770
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

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
ENY3576 Envoy Air 7 2026-07-22
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
ENY3750 - 6 2026-07-16
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY4145 IND → MIA Jul 26, 21:45 UTCJul 26, 22:15 UTC30m
2026-07-26 ENY3994 DFW → LCH Jul 26, 18:10 UTCJul 26, 19:55 UTC1h 45m
2026-07-26 ENY3994 DFW → LCH Jul 26, 15:00 UTCJul 26, 16:45 UTC1h 45m
2026-07-26 ENY3673 GSO → ORD Jul 26, 11:05 UTCJul 26, 13:00 UTC1h 55m
2026-07-26 ENY3673 GSO → ORD Jul 26, 11:01 UTCJul 26, 12:56 UTC1h 55m
2026-07-26 ENY4188 DFW → ATW Jul 26, 01:35 UTCJul 26, 03:50 UTC2h 15m
2026-07-26 ENY4188 DFW → ATW Jul 26, 01:31 UTCJul 26, 03:45 UTC2h 14m
2026-07-25 ENY4244 ORD → COU Jul 25, 22:35 UTCJul 25, 23:50 UTC1h 15m
2026-07-25 ENY4244 ORD → COU Jul 25, 21:22 UTCJul 25, 23:51 UTC2h 29m
2026-07-25 ENY4244 ORD → COU Jul 25, 18:25 UTCJul 25, 19:25 UTC1h 0m
2026-07-25 ENY4005 TRC → DFW Jul 25, 15:35 UTCJul 25, 16:25 UTC50m
2026-07-25 ENY4005 TRC → DFW Jul 25, 13:50 UTCJul 25, 14:20 UTC30m
2026-07-25 ENY3473 STL → MIA Jul 25, 10:25 UTCJul 25, 11:50 UTC1h 25m
2026-07-25 ENY3473 STL → MIA Jul 25, 10:20 UTCJul 25, 11:48 UTC1h 28m
2026-07-25 ENY3798 ORD → TYS Jul 25, 02:20 UTCJul 25, 04:00 UTC1h 40m
2026-07-24 ENY3762 ORD → BWI Jul 24, 20:35 UTCJul 25, 01:05 UTC4h 30m
2026-07-24 ENY3469 ORD → DSM Jul 24, 17:20 UTCJul 24, 18:50 UTC1h 30m
2026-07-24 ENY3469 ORD → DSM Jul 24, 14:45 UTCJul 24, 16:15 UTC1h 30m
2026-07-24 ENY3780 BOS → ORD Jul 24, 12:15 UTCJul 24, 13:00 UTC45m
2026-07-24 ENY3780 BOS → ORD Jul 24, 12:05 UTCJul 24, 12:54 UTC49m
2026-07-24 ENY3510 CMH → DFW Jul 24, 01:15 UTCJul 24, 02:00 UTC45m
2026-07-24 ENY3510 CMH → DFW Jul 24, 01:13 UTCJul 24, 02:06 UTC53m
2026-07-23 ENY3689 BOS → IND Jul 23, 22:45 UTCJul 24, 00:00 UTC1h 15m
2026-07-23 ENY3689 BOS → IND Jul 23, 22:39 UTCJul 23, 23:54 UTC1h 15m
2026-07-23 ENY3689 BOS → IND Jul 23, 20:45 UTCJul 23, 21:50 UTC1h 5m
2026-07-23 ENY3368 ATW → CLT Jul 23, 19:15 UTCJul 23, 19:45 UTC30m
2026-07-23 ENY3368 ATW → CLT Jul 23, 19:05 UTCJul 23, 19:39 UTC34m
2026-07-23 ENY3368 ATW → CLT Jul 23, 17:15 UTCJul 23, 17:35 UTC20m
2026-07-23 ENY3390 EYW → ORD Jul 23, 14:05 UTCJul 23, 15:50 UTC1h 45m
2026-07-23 ENY3390 EYW → ORD Jul 23, 11:15 UTCJul 23, 13:00 UTC1h 45m
2026-07-23 ENY3635 ORD → IND Jul 23, 00:40 UTCJul 23, 01:25 UTC45m
2026-07-23 ENY3635 ORD → IND Jul 23, 00:32 UTCJul 23, 01:28 UTC56m
2026-07-22 ENY3635 ORD → IND Jul 22, 22:55 UTCJul 22, 23:30 UTC35m
2026-07-22 ENY3482 DFW → CLL Jul 22, 20:55 UTCJul 22, 21:55 UTC1h 0m
2026-07-22 ENY3482 DFW → CLL Jul 22, 19:05 UTCJul 22, 20:05 UTC1h 0m
2026-07-22 ENY3576 ORD → FAR Jul 22, 15:55 UTCJul 22, 17:05 UTC1h 10m
2026-07-22 ENY3576 ORD → FAR Jul 22, 14:05 UTCJul 22, 15:10 UTC1h 5m
2026-07-22 ENY3360 - Jul 22, 11:15 UTCJul 22, 12:10 UTC55m
2026-07-22 ENY3360 LFT → DFW Jul 22, 11:09 UTCJul 22, 12:05 UTC56m
2026-07-22 ENY3359 ORD → BDL Jul 22, 03:20 UTCJul 22, 04:15 UTC55m
2026-07-21 ENY3925 - Jul 21, 23:55 UTCJul 22, 01:20 UTC1h 25m
2026-07-21 ENY3925 BNA → DFW Jul 21, 23:52 UTCJul 22, 01:20 UTC1h 28m
2026-07-21 ENY3823 DFW → LRD Jul 21, 20:55 UTCJul 21, 22:25 UTC1h 30m
2026-07-21 ENY3823 DFW → LRD Jul 21, 18:45 UTCJul 21, 20:05 UTC1h 20m
2026-07-21 ENY3825 STL → BOS Jul 21, 16:20 UTCJul 21, 17:45 UTC1h 25m
2026-07-21 ENY3825 STL → BOS Jul 21, 14:10 UTCJul 21, 15:40 UTC1h 30m
2026-07-21 ENY3912 DFW → BNA Jul 21, 11:55 UTCJul 21, 13:25 UTC1h 30m
2026-07-21 ENY3557 CMH → DFW Jul 21, 01:10 UTCJul 21, 03:00 UTC1h 50m
2026-07-20 ENY3558 TRI → DFW Jul 20, 22:50 UTCJul 21, 00:15 UTC1h 25m
2026-07-20 ENY3337 FPO → MIA Jul 20, 17:48 UTCJul 20, 18:18 UTC30m

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.