Apparatus

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sensors Mode-S transponder

A1FFF2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N228NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A1FFF2
Octal
50377762
Decimal
10,616,818
Country
US
Tail
N228NN
Type
E75L
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
737
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A1FFF2.

Country allocation

The ICAO 24-bit address A1FFF2 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
ENY3507 - 14 2026-07-05
ENY3623 - 9 2026-06-30
ENY3793 Envoy Air 7 2026-07-24
ENY3508 Envoy Air 7 2026-05-17
ENY3468 - 7 2026-06-14
ENY3430 - 7 2026-07-16
ENY4060 - 6 2026-06-16
ENY3344 - 6 2026-07-02
ENY4158 Envoy Air 5 2026-07-26
ENY4133 Envoy Air 5 2026-07-20
ENY4125 Envoy Air 5 2026-05-21
ENY4087 - 5 2026-06-21
ENY4076 Envoy Air 5 2026-07-25
ENY3980 Envoy Air 5 2026-05-19
ENY3973 Envoy Air 5 2026-05-20
ENY3776 Envoy Air 5 2026-06-05
ENY3689 Envoy Air 5 2026-05-15
ENY3633 Envoy Air 5 2026-07-26
ENY3618 - 5 2026-06-30
ENY3591 Envoy Air 5 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3633 STL → ORD Jul 26, 21:25 UTCJul 26, 22:30 UTC1h 5m
2026-07-26 ENY3863 STL → ORD Jul 26, 18:30 UTCJul 26, 20:10 UTC1h 40m
2026-07-26 ENY3863 STL → ORD Jul 26, 18:26 UTCJul 26, 20:16 UTC1h 50m
2026-07-26 ENY3863 STL → ORD Jul 26, 15:50 UTCJul 26, 17:20 UTC1h 30m
2026-07-26 ENY4158 ORD → BWI Jul 26, 12:25 UTCJul 26, 13:55 UTC1h 30m
2026-07-26 ENY4158 ORD → BWI Jul 26, 12:20 UTCJul 26, 13:53 UTC1h 33m
2026-07-26 ENY4079 DFW → LIT Jul 26, 02:30 UTCJul 26, 03:10 UTC40m
2026-07-25 ENY3467 IND → BOS Jul 25, 23:45 UTCJul 26, 00:30 UTC45m
2026-07-25 ENY3467 IND → BOS Jul 25, 22:40 UTCJul 25, 23:10 UTC30m
2026-07-25 ENY3764 BGR → ORD Jul 25, 20:10 UTCJul 25, 21:40 UTC1h 30m
2026-07-25 ENY4076 BUF → ORD Jul 25, 15:45 UTCJul 25, 17:15 UTC1h 30m
2026-07-25 ENY4076 BUF → ORD Jul 25, 15:43 UTCJul 25, 17:35 UTC1h 52m
2026-07-25 ENY3497 ORD → BHM Jul 25, 11:15 UTCJul 25, 13:20 UTC2h 5m
2026-07-25 ENY3494 SGF → DFW Jul 25, 02:30 UTCJul 25, 04:40 UTC2h 10m
2026-07-25 ENY4204 DFW → CMH Jul 25, 00:16 UTCJul 25, 01:18 UTC1h 2m
2026-07-25 ENY4204 DFW → CMH Jul 25, 00:20 UTCJul 25, 01:10 UTC50m
2026-07-24 ENY4204 DFW → CMH Jul 24, 22:25 UTCJul 24, 23:25 UTC1h 0m
2026-07-24 ENY3793 TLH → DCA Jul 24, 18:25 UTCJul 24, 20:55 UTC2h 30m
2026-07-24 ENY3793 TLH → DCA Jul 24, 14:35 UTCJul 24, 17:10 UTC2h 35m
2026-07-24 ENY3907 JAX → ORD Jul 24, 11:10 UTCJul 24, 13:00 UTC1h 50m
2026-07-24 ENY3907 JAX → ORD Jul 24, 11:05 UTCJul 24, 12:57 UTC1h 52m
2026-07-24 ENY3933 LEX → ORD Jul 24, 02:45 UTCJul 24, 04:50 UTC2h 5m
2026-07-23 ENY3565 DCA → XNA Jul 23, 23:55 UTCJul 24, 01:00 UTC1h 5m
2026-07-23 ENY3565 DCA → XNA Jul 23, 22:15 UTCJul 23, 23:05 UTC50m
2026-07-23 ENY3565 DCA → XNA Jul 23, 22:05 UTCJul 23, 22:10 UTC5m
2026-07-23 ENY3793 TLH → DCA Jul 23, 18:20 UTCJul 23, 20:40 UTC2h 20m
2026-07-23 ENY3793 TLH → DCA Jul 23, 14:40 UTCJul 23, 17:10 UTC2h 30m
2026-07-23 ENY3907 JAX → ORD Jul 23, 11:10 UTCJul 23, 13:15 UTC2h 5m
2026-07-23 ENY3933 LEX → ORD Jul 23, 02:50 UTCJul 23, 04:40 UTC1h 50m
2026-07-22 ENY3793 TLH → DCA Jul 22, 21:20 UTCJul 22, 23:49 UTC2h 29m
2026-07-22 ENY3793 TLH → DCA Jul 22, 21:25 UTCJul 22, 23:50 UTC2h 25m
2026-07-22 ENY3793 TLH → DCA Jul 22, 17:40 UTCJul 22, 20:05 UTC2h 25m
2026-07-22 ENY3497 - Jul 22, 11:10 UTCJul 22, 13:15 UTC2h 5m
2026-07-22 ENY3497 MFE → PHX Jul 22, 11:08 UTCJul 22, 13:11 UTC2h 3m
2026-07-22 ENY3494 - Jul 22, 03:05 UTCJul 22, 05:15 UTC2h 10m
2026-07-21 ENY3826 PIA → ORD Jul 21, 23:15 UTCJul 22, 01:35 UTC2h 20m
2026-07-21 ENY3826 PIA → ORD Jul 21, 19:55 UTCJul 21, 22:05 UTC2h 10m
2026-07-21 ENY3335 - Jul 21, 14:35 UTCJul 21, 16:50 UTC2h 15m
2026-07-21 ENY3362 PHX → STS Jul 21, 03:20 UTCJul 21, 04:00 UTC40m
2026-07-20 ENY4133 BNA → DCA Jul 20, 23:45 UTCJul 21, 00:25 UTC40m
2026-07-20 ENY4133 BNA → DCA Jul 20, 23:41 UTCJul 21, 00:23 UTC42m
2026-07-20 ENY4133 BNA → DCA Jul 20, 22:05 UTCJul 20, 22:50 UTC45m
2026-07-20 ENY3764 BGR → ORD Jul 20, 19:10 UTCJul 20, 20:45 UTC1h 35m
2026-07-20 ENY3764 BGR → ORD Jul 20, 18:48 UTCJul 20, 20:41 UTC1h 53m
2026-07-20 ENY4076 PHX → RAP Jul 20, 15:57 UTCJul 20, 17:52 UTC1h 55m
2026-07-20 ENY4076 - Jul 20, 16:00 UTCJul 20, 16:30 UTC30m
2026-07-20 ENY3497 - Jul 20, 11:10 UTCJul 20, 13:25 UTC2h 15m
2026-07-20 ENY3494 - Jul 20, 02:25 UTCJul 20, 04:35 UTC2h 10m
2026-07-20 ENY4165 PHX → XNA Jul 20, 00:05 UTCJul 20, 01:30 UTC1h 25m
2026-07-19 ENY4165 PHX → XNA Jul 19, 21:10 UTCJul 19, 22:30 UTC1h 20m

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 N228NN page for operator, model, and routing details .

Mode-S A1FFF2 frequently asked

What is Mode-S code A1FFF2?
A1FFF2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N228NN.
Where is Mode-S A1FFF2 registered?
Mode-S code A1FFF2 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 A1FFF2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1FFF2, octal 50377762, decimal 10,616,818.
What flights does A1FFF2 operate?
Mode-S A1FFF2 has broadcast 20 distinct callsigns, including ENY3507, ENY3623, ENY3793, ENY3508, ENY3468.