Apparatus

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sensors Mode-S transponder

A1E5F1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N221NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A1E5F1
Octal
50362761
Decimal
10,610,161
Country
US
Tail
N221NN
Type
E75L
No current signal · last broadcast 53m ago
Flights observed
666
Distinct callsigns
20
Country
US
Last broadcast
53m ago

Last known position

Most recent position reported by Mode-S A1E5F1.

Country allocation

The ICAO 24-bit address A1E5F1 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
ENY3642 - 12 2026-07-12
ENY3825 - 10 2026-07-01
ENY3485 Envoy Air 9 2026-05-05
ENY4114 Envoy Air 8 2026-06-09
ENY3643 Envoy Air 8 2026-04-30
ENY3504 - 8 2026-06-13
ENY4048 Envoy Air 7 2026-06-10
ENY3925 - 7 2026-07-02
ENY3823 - 7 2026-07-01
ENY3383 - 7 2026-06-25
ENY3936 - 6 2026-07-13
ENY3883 - 6 2026-06-29
ENY3830 - 6 2026-07-09
ENY3721 - 6 2026-06-20
ENY3526 - 6 2026-07-09
ENY3397 Envoy Air 6 2026-05-31
ENY4080 Envoy Air 5 2026-05-22
ENY3912 - 5 2026-07-01
ENY3720 Envoy Air 5 2026-06-10
ENY3695 Envoy Air 5 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ENY3936 - Jul 13, 23:20 UTCJul 14, 01:40 UTC2h 20m
2026-07-13 ENY3936 - Jul 13, 20:25 UTCJul 13, 22:35 UTC2h 10m
2026-07-13 ENY4010 - Jul 13, 17:10 UTCJul 13, 18:30 UTC1h 20m
2026-07-13 ENY4010 - Jul 13, 15:00 UTCJul 13, 16:00 UTC1h 0m
2026-07-13 ENY3673 ATW → DFW Jul 13, 11:00 UTCJul 13, 13:10 UTC2h 10m
2026-07-13 ENY3673 ATW → DFW Jul 13, 11:00 UTCJul 13, 13:06 UTC2h 6m
2026-07-13 ENY4188 DFW → ATW Jul 13, 02:05 UTCJul 13, 04:15 UTC2h 10m
2026-07-12 ENY4125 - Jul 12, 21:40 UTCJul 13, 00:35 UTC2h 55m
2026-07-12 ENY4125 - Jul 12, 17:55 UTCJul 12, 20:40 UTC2h 45m
2026-07-12 ENY3495 - Jul 12, 14:55 UTCJul 12, 16:30 UTC1h 35m
2026-07-12 ENY3495 DFW → DSM Jul 12, 12:30 UTCJul 12, 14:05 UTC1h 35m
2026-07-12 ENY3393 - Jul 12, 10:15 UTCJul 12, 10:45 UTC30m
2026-07-12 ENY3349 - Jul 12, 03:55 UTCJul 12, 04:10 UTC15m
2026-07-12 ENY3642 LRD → DFW Jul 12, 01:25 UTCJul 12, 02:35 UTC1h 10m
2026-07-11 ENY3642 DFW → LRD Jul 11, 23:30 UTCJul 12, 00:25 UTC55m
2026-07-11 ENY3860 - Jul 11, 19:15 UTCJul 11, 21:50 UTC2h 35m
2026-07-11 ENY3860 - Jul 11, 15:00 UTCJul 11, 17:35 UTC2h 35m
2026-07-10 ENY3381 - Jul 10, 23:50 UTCJul 11, 01:10 UTC1h 20m
2026-07-10 ENY3381 - Jul 10, 21:30 UTCJul 10, 23:00 UTC1h 30m
2026-07-10 ENY3977 - Jul 10, 17:40 UTCJul 10, 19:55 UTC2h 15m
2026-07-10 ENY3977 DFW → ATW Jul 10, 14:50 UTCJul 10, 16:45 UTC1h 55m
2026-07-10 ENY3521 - Jul 10, 11:10 UTCJul 10, 13:15 UTC2h 5m
2026-07-10 ENY4208 - Jul 10, 02:40 UTCJul 10, 04:40 UTC2h 0m
2026-07-09 ENY3762 - Jul 9, 23:20 UTCJul 10, 01:20 UTC2h 0m
2026-07-09 ENY3762 RAP → DFW Jul 9, 23:12 UTCJul 10, 01:14 UTC2h 2m
2026-07-09 ENY3762 - Jul 9, 20:05 UTCJul 9, 21:40 UTC1h 35m
2026-07-09 ENY3526 - Jul 9, 16:45 UTCJul 9, 19:00 UTC2h 15m
2026-07-09 ENY3526 - Jul 9, 13:30 UTCJul 9, 15:45 UTC2h 15m
2026-07-09 ENY4179 - Jul 9, 11:30 UTCJul 9, 12:10 UTC40m
2026-07-09 ENY3537 - Jul 9, 04:05 UTCJul 9, 04:15 UTC10m
2026-07-09 ENY3537 DFW → FSM Jul 9, 04:05 UTCJul 9, 04:51 UTC46m
2026-07-09 ENY3830 - Jul 9, 01:45 UTCJul 9, 02:15 UTC30m
2026-07-09 ENY3830 TUL → DFW Jul 9, 01:42 UTCJul 9, 02:24 UTC42m
2026-07-09 ENY3830 DFW → TUL Jul 9, 00:15 UTCJul 9, 01:00 UTC45m
2026-07-08 ENY3483 SYR → ORD Jul 8, 16:40 UTCJul 8, 22:10 UTC5h 30m
2026-07-08 ENY3614 XNA → DFW Jul 8, 10:40 UTCJul 8, 11:25 UTC45m
2026-07-08 ENY3614 XNA → DFW Jul 8, 10:35 UTCJul 8, 11:22 UTC47m
2026-07-08 ENY4101 DFW → XNA Jul 8, 03:14 UTCJul 8, 04:02 UTC48m
2026-07-08 ENY3678 - Jul 8, 00:20 UTCJul 8, 01:30 UTC1h 10m
2026-07-08 ENY3678 MEM → DFW Jul 8, 00:17 UTCJul 8, 01:26 UTC1h 9m
2026-07-07 ENY3678 - Jul 7, 20:25 UTCJul 7, 21:25 UTC1h 0m
2026-07-07 ENY3451 DAB → DFW Jul 7, 16:25 UTCJul 7, 18:15 UTC1h 50m
2026-07-07 ENY3451 DAB → DFW Jul 7, 16:25 UTCJul 7, 18:05 UTC1h 40m
2026-07-07 ENY3451 DAB → DFW Jul 7, 13:50 UTCJul 7, 15:40 UTC1h 50m
2026-07-07 ENY3828 - Jul 7, 10:40 UTCJul 7, 12:15 UTC1h 35m
2026-07-07 ENY4015 - Jul 7, 04:10 UTCJul 7, 05:35 UTC1h 25m
2026-07-07 ENY4015 DFW → EVV Jul 7, 04:08 UTCJul 7, 05:37 UTC1h 29m
2026-07-07 ENY3878 SAT → DFW Jul 7, 01:35 UTCJul 7, 03:00 UTC1h 25m
2026-07-06 ENY3781 - Jul 6, 23:15 UTCJul 7, 00:00 UTC45m
2026-07-06 ENY4024 - Jul 6, 13:50 UTCJul 6, 16:05 UTC2h 15m

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 N221NN page for operator, model, and routing details .

Mode-S A1E5F1 frequently asked

What is Mode-S code A1E5F1?
A1E5F1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N221NN.
Where is Mode-S A1E5F1 registered?
Mode-S code A1E5F1 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 A1E5F1 broadcasting right now?
No active broadcast right now. Last signal was 53m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1E5F1, octal 50362761, decimal 10,610,161.
What flights does A1E5F1 operate?
Mode-S A1E5F1 has broadcast 20 distinct callsigns, including ENY3642, ENY3825, ENY3485, ENY4114, ENY3643.