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 Jul 26, 22:15 UTC
Flights observed
758
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

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
ENY4114 Envoy Air 10 2026-07-22
ENY4048 Envoy Air 10 2026-07-23
ENY3825 - 10 2026-07-01
ENY3964 - 9 2026-07-17
ENY3485 Envoy Air 9 2026-05-05
ENY3720 - 8 2026-07-20
ENY3643 Envoy Air 8 2026-04-30
ENY3504 - 8 2026-06-13
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
ENY3708 - 6 2026-07-17
ENY3526 - 6 2026-07-09
ENY3397 Envoy Air 6 2026-05-31
ENY3351 - 6 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3762 ORD → BWI Jul 26, 21:45 UTCJul 26, 22:15 UTC30m
2026-07-26 ENY3701 DFW → MSN Jul 26, 19:10 UTCJul 26, 19:55 UTC45m
2026-07-26 ENY3701 DFW → MSN Jul 26, 17:05 UTCJul 26, 17:45 UTC40m
2026-07-26 ENY3736 LSE → ORD Jul 26, 02:35 UTCJul 26, 14:20 UTC11h 46m
2026-07-25 ENY3554 CVG → MIA Jul 25, 21:10 UTCJul 25, 23:25 UTC2h 15m
2026-07-25 ENY3554 CVG → MIA Jul 25, 15:25 UTCJul 25, 17:30 UTC2h 5m
2026-07-25 ENY3534 CMH → ORD Jul 25, 12:35 UTCJul 25, 14:05 UTC1h 30m
2026-07-25 ENY4034 DCA → BOS Jul 25, 02:35 UTCJul 25, 04:05 UTC1h 30m
2026-07-25 ENY3878 ORD → EWR Jul 25, 00:20 UTCJul 25, 01:10 UTC50m
2026-07-24 ENY3781 CHA → DFW Jul 24, 22:45 UTCJul 24, 23:25 UTC40m
2026-07-24 ENY3781 CHA → DFW Jul 24, 22:40 UTCJul 24, 23:25 UTC45m
2026-07-24 ENY3764 BGR → ORD Jul 24, 20:15 UTCJul 24, 21:45 UTC1h 30m
2026-07-24 ENY4076 BUF → ORD Jul 24, 17:10 UTCJul 24, 18:45 UTC1h 35m
2026-07-24 ENY3335 - Jul 24, 13:40 UTCJul 24, 16:00 UTC2h 20m
2026-07-23 ENY4329 ORD → MVY Jul 23, 23:05 UTCJul 24, 01:20 UTC2h 15m
2026-07-23 ENY3650 ORD → SYR Jul 23, 19:44 UTCJul 23, 20:54 UTC1h 10m
2026-07-23 ENY3650 ORD → SYR Jul 23, 17:45 UTCJul 23, 18:40 UTC55m
2026-07-23 ENY4048 IAH → DFW Jul 23, 13:35 UTCJul 23, 15:45 UTC2h 10m
2026-07-23 ENY4048 IAH → DFW Jul 23, 13:32 UTCJul 23, 15:40 UTC2h 8m
2026-07-23 ENY4028 BOS → CVG Jul 23, 04:15 UTCJul 23, 06:25 UTC2h 10m
2026-07-23 ENY4021 PHX → CLD Jul 23, 02:10 UTCJul 23, 03:05 UTC55m
2026-07-23 ENY4021 PHX → CLD Jul 23, 00:30 UTCJul 23, 01:20 UTC50m
2026-07-22 ENY4114 - Jul 22, 20:55 UTCJul 22, 23:05 UTC2h 10m
2026-07-22 ENY4114 - Jul 22, 17:45 UTCJul 22, 19:55 UTC2h 10m
2026-07-22 ENY3335 - Jul 22, 13:35 UTCJul 22, 16:00 UTC2h 25m
2026-07-21 ENY4329 ORD → MVY Jul 21, 23:05 UTCJul 22, 01:15 UTC2h 10m
2026-07-21 ENY3588 ORD → BOS Jul 21, 19:45 UTCJul 21, 21:15 UTC1h 30m
2026-07-21 ENY3588 ORD → BOS Jul 21, 19:42 UTCJul 21, 21:14 UTC1h 32m
2026-07-21 ENY3588 ORD → BOS Jul 21, 17:20 UTCJul 21, 18:45 UTC1h 25m
2026-07-21 ENY4187 - Jul 21, 15:45 UTCJul 21, 16:15 UTC30m
2026-07-21 ENY3831 PHX → TUS Jul 21, 14:25 UTCJul 21, 14:50 UTC25m
2026-07-21 ENY3831 PHX → TUS Jul 21, 14:24 UTCJul 21, 14:48 UTC24m
2026-07-21 ENY3907 - Jul 21, 11:10 UTCJul 21, 13:00 UTC1h 50m
2026-07-21 ENY3933 LEX → ORD Jul 21, 02:40 UTCJul 21, 04:50 UTC2h 10m
2026-07-21 ENY4204 CLD → PHX Jul 21, 00:15 UTCJul 21, 01:15 UTC1h 0m
2026-07-20 ENY4204 PHX → CLD Jul 20, 22:25 UTCJul 20, 23:15 UTC50m
2026-07-20 ENY3720 - Jul 20, 19:40 UTCJul 20, 21:10 UTC1h 30m
2026-07-20 ENY3720 MRY → PHX Jul 20, 19:35 UTCJul 20, 21:08 UTC1h 33m
2026-07-20 ENY3720 - Jul 20, 17:20 UTCJul 20, 18:35 UTC1h 15m
2026-07-20 ENY4048 EUG → PHX Jul 20, 13:40 UTCJul 20, 16:00 UTC2h 20m
2026-07-20 ENY4028 PHX → EUG Jul 20, 03:50 UTCJul 20, 05:50 UTC2h 0m
2026-07-20 ENY4126 LBB → DFW Jul 20, 01:40 UTCJul 20, 02:05 UTC25m
2026-07-20 ENY4126 LBB → DFW Jul 20, 00:20 UTCJul 20, 00:45 UTC25m
2026-07-19 ENY4081 - Jul 19, 19:55 UTCJul 19, 22:25 UTC2h 30m
2026-07-19 ENY4081 - Jul 19, 16:05 UTCJul 19, 18:45 UTC2h 40m
2026-07-19 ENY9870 - Jul 19, 12:45 UTCJul 19, 14:35 UTC1h 50m
2026-07-19 ENY3890 CVG → CLT Jul 19, 00:45 UTCJul 19, 01:50 UTC1h 5m
2026-07-18 ENY3890 CVG → CLT Jul 18, 22:30 UTCJul 18, 23:30 UTC1h 0m
2026-07-18 ENY3441 - Jul 18, 19:50 UTCJul 18, 21:00 UTC1h 10m
2026-07-18 ENY3441 BRO → DFW Jul 18, 19:44 UTCJul 18, 21:01 UTC1h 17m

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 Jul 26, 22:15 UTC.
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, ENY4114, ENY4048, ENY3825, ENY3964.