Apparatus

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sensors Mode-S transponder

A1A218

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N204NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A1A218
Octal
50321030
Decimal
10,592,792
Country
US
Tail
N204NN
Type
E75L
No current signal · last broadcast Jul 26, 20:35 UTC
Flights observed
736
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S A1A218.

Country allocation

The ICAO 24-bit address A1A218 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
ENY3879 Envoy Air 10 2026-05-11
ENY4153 - 9 2026-07-20
ENY3969 - 9 2026-07-08
ENY3967 - 9 2026-07-05
ENY3419 Envoy Air 9 2026-05-18
ENY3654 Envoy Air 8 2026-05-21
ENY3535 - 8 2026-06-22
ENY4178 - 6 2026-06-22
ENY4095 Envoy Air 6 2026-05-31
ENY4017 - 6 2026-06-23
ENY3965 - 6 2026-06-21
ENY3844 Envoy Air 6 2026-06-21
ENY3721 - 6 2026-07-04
ENY3563 Envoy Air 6 2026-06-16
ENY3539 - 6 2026-07-11
ENY3519 Envoy Air 6 2026-06-16
ENY3514 - 6 2026-07-19
ENY4186 Envoy Air 5 2026-05-31
ENY4175 Envoy Air 5 2026-05-18
ENY4145 - 5 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3350 BDL → ORD Jul 26, 20:20 UTCJul 26, 20:35 UTC15m
2026-07-26 ENY3989 ORD → CVG Jul 26, 17:45 UTCJul 26, 18:00 UTC15m
2026-07-26 ENY3989 ORD → CVG Jul 26, 15:45 UTCJul 26, 16:10 UTC25m
2026-07-26 ENY3679 SDF → MIA Jul 26, 11:20 UTCJul 26, 14:10 UTC2h 50m
2026-07-26 ENY3680 ORD → MSN Jul 26, 02:00 UTCJul 26, 04:35 UTC2h 35m
2026-07-26 ENY3680 ORD → MSN Jul 26, 01:56 UTCJul 26, 04:29 UTC2h 33m
2026-07-25 ENY3566 ORD → SYR Jul 25, 23:40 UTCJul 26, 00:55 UTC1h 15m
2026-07-25 ENY3566 ORD → SYR Jul 25, 23:34 UTCJul 26, 00:41 UTC1h 7m
2026-07-25 ENY3566 ORD → SYR Jul 25, 21:25 UTCJul 25, 22:40 UTC1h 15m
2026-07-25 ENY3346 BGR → CLT Jul 25, 14:30 UTCJul 25, 19:25 UTC4h 55m
2026-07-24 ENY3939 ORD → MSN Jul 24, 23:15 UTCJul 25, 01:55 UTC2h 40m
2026-07-24 ENY3939 ORD → MSN Jul 24, 19:20 UTCJul 24, 22:10 UTC2h 50m
2026-07-24 ENY4314 BTR → DFW Jul 24, 17:20 UTCJul 24, 17:40 UTC20m
2026-07-24 ENY4314 BTR → DFW Jul 24, 16:57 UTCJul 24, 17:36 UTC39m
2026-07-24 ENY4314 BTR → DFW Jul 24, 15:25 UTCJul 24, 15:45 UTC20m
2026-07-24 ENY4052 MIA → MCI Jul 24, 11:20 UTCJul 24, 13:35 UTC2h 15m
2026-07-24 ENY3960 CVG → ORD Jul 24, 04:05 UTCJul 24, 05:20 UTC1h 15m
2026-07-24 ENY3479 PVD → ORD Jul 24, 00:00 UTCJul 24, 01:00 UTC1h 0m
2026-07-23 ENY3479 PVD → ORD Jul 23, 22:00 UTCJul 23, 22:45 UTC45m
2026-07-23 ENY3719 - Jul 23, 19:10 UTCJul 23, 20:00 UTC50m
2026-07-23 ENY3719 MSP → ORD Jul 23, 19:09 UTCJul 23, 20:10 UTC1h 1m
2026-07-23 ENY3375 - Jul 23, 17:00 UTCJul 23, 18:05 UTC1h 5m
2026-07-23 ENY3872 - Jul 23, 13:10 UTCJul 23, 15:45 UTC2h 35m
2026-07-23 ENY3872 ELP → ORD Jul 23, 12:58 UTCJul 23, 15:40 UTC2h 42m
2026-07-23 ENY3895 SGF → ORD Jul 23, 03:05 UTCJul 23, 05:20 UTC2h 15m
2026-07-22 ENY3602 ORD → AUS Jul 22, 22:05 UTCJul 23, 00:05 UTC2h 0m
2026-07-22 ENY3602 ORD → AUS Jul 22, 22:04 UTCJul 23, 00:00 UTC1h 56m
2026-07-22 ENY3602 ORD → AUS Jul 22, 19:00 UTCJul 22, 20:45 UTC1h 45m
2026-07-22 ENY3488 ORD → AUS Jul 22, 16:10 UTCJul 22, 17:10 UTC1h 0m
2026-07-22 ENY4121 BUF → ORD Jul 22, 13:05 UTCJul 22, 15:15 UTC2h 10m
2026-07-22 ENY4121 BUF → ORD Jul 22, 12:59 UTCJul 22, 15:08 UTC2h 9m
2026-07-22 ENY3888 DCA → MSP Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-22 ENY3897 MIA → GSP Jul 22, 02:15 UTCJul 22, 03:20 UTC1h 5m
2026-07-22 ENY3897 MIA → GSP Jul 22, 02:10 UTCJul 22, 03:35 UTC1h 25m
2026-07-21 ENY3595 DCA → RSW Jul 21, 23:15 UTCJul 22, 01:05 UTC1h 50m
2026-07-21 ENY3595 DCA → RSW Jul 21, 19:55 UTCJul 21, 21:45 UTC1h 50m
2026-07-21 ENY4007 OCJ → MIA Jul 21, 17:06 UTCJul 21, 18:26 UTC1h 20m
2026-07-21 ENY4007 - Jul 21, 14:50 UTCJul 21, 18:30 UTC3h 40m
2026-07-21 ENY3667 CMH → MIA Jul 21, 11:15 UTCJul 21, 13:25 UTC2h 10m
2026-07-20 ENY3540 CMH → MIA Jul 20, 22:25 UTCJul 20, 23:15 UTC50m
2026-07-20 ENY3540 CMH → MIA Jul 20, 22:22 UTCJul 20, 23:11 UTC49m
2026-07-20 ENY4153 - Jul 20, 16:55 UTCJul 20, 19:05 UTC2h 10m
2026-07-20 ENY4153 VPS → ORD Jul 20, 16:47 UTCJul 20, 19:01 UTC2h 14m
2026-07-20 ENY4153 - Jul 20, 13:45 UTCJul 20, 15:15 UTC1h 30m
2026-07-20 ENY4088 XNA → ORD Jul 20, 10:05 UTCJul 20, 11:35 UTC1h 30m
2026-07-19 ENY4086 PHX → XNA Jul 19, 23:10 UTCJul 20, 01:25 UTC2h 15m
2026-07-19 ENY3514 - Jul 19, 20:35 UTCJul 19, 22:15 UTC1h 40m
2026-07-19 ENY3514 STS → PHX Jul 19, 20:32 UTCJul 19, 22:13 UTC1h 41m
2026-07-19 ENY3514 - Jul 19, 17:35 UTCJul 19, 19:15 UTC1h 40m
2026-07-19 ENY4048 EUG → PHX Jul 19, 13:21 UTCJul 19, 15:29 UTC2h 8m

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 N204NN page for operator, model, and routing details .

Mode-S A1A218 frequently asked

What is Mode-S code A1A218?
A1A218 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N204NN.
Where is Mode-S A1A218 registered?
Mode-S code A1A218 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 A1A218 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1A218, octal 50321030, decimal 10,592,792.
What flights does A1A218 operate?
Mode-S A1A218 has broadcast 20 distinct callsigns, including ENY3879, ENY4153, ENY3969, ENY3967, ENY3419.