Apparatus

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sensors Mode-S transponder

A1D873

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N218NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A1D873
Octal
50354163
Decimal
10,606,707
Country
US
Tail
N218NN
Type
E75L
Broadcasting now · callsign ENY3502 · 16,350 ft
Flights observed
721
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:50 UTC

Current position

A1D873 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A1D873 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
ENY3633 - 11 2026-06-29
ENY4133 - 7 2026-07-13
ENY3893 Envoy Air 7 2026-07-23
ENY3592 Envoy Air 7 2026-05-20
ENY3355 - 7 2026-07-16
ENY4171 - 6 2026-06-24
ENY3976 - 6 2026-06-28
ENY3835 Envoy Air 6 2026-05-25
ENY3827 Envoy Air 6 2026-04-27
ENY3535 Envoy Air 6 2026-05-30
ENY3514 - 6 2026-06-23
ENY3338 - 6 2026-07-17
ENY4131 - 5 2026-06-28
ENY4029 Envoy Air 5 2026-06-27
ENY4021 Envoy Air 5 2026-05-23
ENY3825 - 5 2026-07-05
ENY3821 Envoy Air 5 2026-07-24
ENY3817 Envoy Air 5 2026-06-03
ENY3754 Envoy Air 5 2026-07-25
ENY3652 - 5 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3420 DFW → MAF Jul 26, 21:30 UTCJul 26, 21:50 UTC20m
2026-07-26 ENY4317 PHX → GRB Jul 26, 17:45 UTCJul 26, 20:10 UTC2h 25m
2026-07-26 ENY3978 GSP → ORD Jul 26, 14:31 UTCJul 26, 15:13 UTC42m
2026-07-26 ENY3978 GSP → ORD Jul 26, 12:55 UTCJul 26, 13:20 UTC25m
2026-07-26 ENY3662 MSN → AUS Jul 26, 09:15 UTCJul 26, 11:20 UTC2h 5m
2026-07-26 ENY3550 CVG → ORD Jul 26, 02:50 UTCJul 26, 05:00 UTC2h 10m
2026-07-26 ENY3555 CVG → BOS Jul 26, 01:00 UTCJul 26, 01:50 UTC50m
2026-07-25 ENY3555 CVG → BOS Jul 25, 22:35 UTCJul 25, 23:25 UTC50m
2026-07-25 ENY3419 RDU → CVG Jul 25, 18:10 UTCJul 25, 20:40 UTC2h 30m
2026-07-25 ENY4175 PHX → ICT Jul 25, 14:25 UTCJul 25, 16:40 UTC2h 15m
2026-07-25 ENY3640 GSO → MIA Jul 25, 11:20 UTCJul 25, 13:00 UTC1h 40m
2026-07-25 ENY3754 MIA → GSO Jul 25, 01:00 UTCJul 25, 02:40 UTC1h 40m
2026-07-24 ENY3749 MEM → DCA Jul 24, 22:15 UTCJul 24, 23:40 UTC1h 25m
2026-07-24 ENY3749 MEM → DCA Jul 24, 19:50 UTCJul 24, 21:10 UTC1h 20m
2026-07-24 ENY3954 STL → DCA Jul 24, 16:00 UTCJul 24, 18:20 UTC2h 20m
2026-07-24 ENY3954 STL → DCA Jul 24, 12:40 UTCJul 24, 15:00 UTC2h 20m
2026-07-24 ENY3682 OMA → ORD Jul 24, 10:15 UTCJul 24, 11:25 UTC1h 10m
2026-07-24 ENY3920 ORD → OKC Jul 24, 02:55 UTCJul 24, 04:05 UTC1h 10m
2026-07-24 ENY3821 BMI → DFW Jul 24, 00:50 UTCJul 24, 01:55 UTC1h 5m
2026-07-24 ENY3821 BMI → DFW Jul 24, 00:48 UTCJul 24, 01:52 UTC1h 4m
2026-07-23 ENY3821 BMI → DFW Jul 23, 22:55 UTCJul 23, 23:55 UTC1h 0m
2026-07-23 ENY3884 SDF → DFW Jul 23, 21:25 UTCJul 23, 21:50 UTC25m
2026-07-23 ENY3884 SDF → DFW Jul 23, 19:20 UTCJul 23, 19:40 UTC20m
2026-07-23 ENY4314 BTR → DFW Jul 23, 17:55 UTCJul 23, 18:20 UTC25m
2026-07-23 ENY4314 BTR → DFW Jul 23, 15:25 UTCJul 23, 15:40 UTC15m
2026-07-23 ENY3492 - Jul 23, 12:10 UTCJul 23, 13:05 UTC55m
2026-07-23 ENY3893 ORD → AVP Jul 23, 02:25 UTCJul 23, 03:20 UTC55m
2026-07-22 ENY4237 MIA → EIS Jul 22, 17:15 UTCJul 22, 19:35 UTC2h 20m
2026-07-22 ENY4237 MIA → EIS Jul 22, 17:05 UTCJul 22, 19:32 UTC2h 27m
2026-07-22 ENY3363 - Jul 22, 15:35 UTCJul 22, 15:50 UTC15m
2026-07-22 ENY3363 - Jul 22, 13:35 UTCJul 22, 13:55 UTC20m
2026-07-22 ENY3585 STS → DFW Jul 22, 02:40 UTCJul 22, 03:45 UTC1h 5m
2026-07-21 ENY3517 ATL → CLT Jul 21, 23:55 UTCJul 22, 00:15 UTC20m
2026-07-21 ENY3517 ATL → CLT Jul 21, 22:15 UTCJul 21, 22:35 UTC20m
2026-07-21 ENY3858 TLH → MIA Jul 21, 10:30 UTCJul 21, 11:15 UTC45m
2026-07-21 ENY3858 TLH → MIA Jul 21, 10:15 UTCJul 21, 10:25 UTC10m
2026-07-21 ENY3585 STS → DFW Jul 21, 02:45 UTCJul 21, 03:50 UTC1h 5m
2026-07-21 ENY3585 STS → DFW Jul 21, 02:44 UTCJul 21, 03:41 UTC57m
2026-07-20 ENY4057 MEM → DCA Jul 20, 23:15 UTCJul 21, 01:45 UTC2h 29m
2026-07-20 ENY4057 MEM → DCA Jul 20, 19:40 UTCJul 20, 22:05 UTC2h 25m
2026-07-20 ENY3877 - Jul 20, 15:45 UTCJul 20, 16:35 UTC50m
2026-07-20 ENY3876 - Jul 20, 14:45 UTCJul 20, 15:05 UTC20m
2026-07-20 ENY3876 - Jul 20, 02:55 UTCJul 20, 04:25 UTC1h 30m
2026-07-20 ENY3876 MIA → JAX Jul 20, 02:53 UTCJul 20, 04:25 UTC1h 32m
2026-07-20 ENY3821 BMI → DFW Jul 20, 00:45 UTCJul 20, 01:46 UTC1h 1m
2026-07-19 ENY3821 BMI → DFW Jul 19, 22:55 UTCJul 19, 23:55 UTC1h 0m
2026-07-19 ENY4007 - Jul 19, 15:15 UTCJul 19, 18:50 UTC3h 35m
2026-07-19 ENY3492 - Jul 19, 12:20 UTCJul 19, 13:15 UTC55m
2026-07-19 ENY3492 JAX → MIA Jul 19, 12:18 UTCJul 19, 13:15 UTC57m
2026-07-19 ENY3893 - Jul 19, 00:30 UTCJul 19, 01:15 UTC45m

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 N218NN page for operator, model, and routing details .

Mode-S A1D873 frequently asked

What is Mode-S code A1D873?
A1D873 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N218NN.
Where is Mode-S A1D873 registered?
Mode-S code A1D873 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 A1D873 broadcasting right now?
Yes. Mode-S A1D873 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1D873, octal 50354163, decimal 10,606,707.
What flights does A1D873 operate?
Mode-S A1D873 has broadcast 20 distinct callsigns, including ENY3633, ENY4133, ENY3893, ENY3592, ENY3355.