Apparatus

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sensors Mode-S transponder

A1FC3B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N227NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A1FC3B
Octal
50376073
Decimal
10,615,867
Country
US
Tail
N227NN
Type
E75L
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
743
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A1FC3B.

Country allocation

The ICAO 24-bit address A1FC3B 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
ENY3998 - 9 2026-06-22
ENY3992 - 9 2026-07-07
ENY3440 - 9 2026-07-08
ENY4089 - 8 2026-07-04
ENY3721 Envoy Air 8 2026-07-17
ENY3509 Envoy Air 8 2026-06-11
ENY3709 Envoy Air 6 2026-04-18
ENY3651 Envoy Air 6 2026-07-25
ENY3609 Envoy Air 6 2026-05-11
ENY3576 - 6 2026-06-27
ENY3549 - 6 2026-07-18
ENY4182 Envoy Air 5 2026-05-13
ENY4054 Envoy Air 5 2026-07-23
ENY4033 - 5 2026-06-28
ENY4021 - 5 2026-07-02
ENY4010 - 5 2026-07-19
ENY3825 Envoy Air 5 2026-07-24
ENY3823 Envoy Air 5 2026-07-24
ENY3720 - 5 2026-07-03
ENY3623 Envoy Air 5 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3621 MIA → MSY Jul 26, 21:50 UTCJul 26, 22:45 UTC55m
2026-07-26 ENY3621 MIA → MSY Jul 26, 19:00 UTCJul 26, 20:50 UTC1h 50m
2026-07-26 ENY3632 ORD → LEX Jul 26, 16:50 UTCJul 26, 17:35 UTC45m
2026-07-26 ENY3632 ORD → LEX Jul 26, 16:44 UTCJul 26, 17:34 UTC50m
2026-07-26 ENY3632 ORD → LEX Jul 26, 15:05 UTCJul 26, 15:45 UTC40m
2026-07-26 ENY4066 RNO → PHX Jul 26, 11:05 UTCJul 26, 13:10 UTC2h 5m
2026-07-26 ENY4064 ORD → EVV Jul 26, 01:50 UTCJul 26, 03:55 UTC2h 5m
2026-07-25 ENY3621 MIA → MSY Jul 25, 22:00 UTCJul 25, 23:45 UTC1h 45m
2026-07-25 ENY3621 MIA → MSY Jul 25, 19:20 UTCJul 25, 21:15 UTC1h 55m
2026-07-25 ENY3651 DCA → ALB Jul 25, 17:10 UTCJul 25, 18:05 UTC55m
2026-07-25 ENY3651 DCA → ALB Jul 25, 17:07 UTCJul 25, 17:59 UTC52m
2026-07-25 ENY3651 DCA → ALB Jul 25, 15:05 UTCJul 25, 15:35 UTC30m
2026-07-25 ENY3370 BNA → TPA Jul 25, 12:00 UTCJul 25, 13:40 UTC1h 40m
2026-07-25 ENY4254 ATW → CLT Jul 25, 02:50 UTCJul 25, 04:30 UTC1h 40m
2026-07-25 ENY4254 ATW → CLT Jul 25, 02:47 UTCJul 25, 04:25 UTC1h 38m
2026-07-25 ENY3925 MIA → HPN Jul 25, 00:15 UTCJul 25, 01:45 UTC1h 30m
2026-07-24 ENY3823 DFW → LRD Jul 24, 21:40 UTCJul 24, 23:25 UTC1h 45m
2026-07-24 ENY3823 DFW → LRD Jul 24, 21:39 UTCJul 24, 23:14 UTC1h 35m
2026-07-24 ENY3823 DFW → LRD Jul 24, 18:50 UTCJul 24, 20:45 UTC1h 55m
2026-07-24 ENY3825 STL → BOS Jul 24, 16:05 UTCJul 24, 17:50 UTC1h 45m
2026-07-24 ENY3825 STL → BOS Jul 24, 13:45 UTCJul 24, 15:15 UTC1h 30m
2026-07-24 ENY3912 MCI → ORD Jul 24, 11:15 UTCJul 24, 12:45 UTC1h 30m
2026-07-24 ENY3481 DFW → CHS Jul 24, 03:30 UTCJul 24, 04:35 UTC1h 5m
2026-07-24 ENY3481 DFW → CHS Jul 24, 03:24 UTCJul 24, 04:33 UTC1h 9m
2026-07-24 ENY3990 ICT → ORD Jul 24, 01:05 UTCJul 24, 02:35 UTC1h 30m
2026-07-23 ENY3519 ORD → ORF Jul 23, 21:15 UTCJul 23, 22:55 UTC1h 40m
2026-07-23 ENY3519 ORD → ORF Jul 23, 21:09 UTCJul 23, 22:51 UTC1h 42m
2026-07-23 ENY3519 ORD → ORF Jul 23, 18:45 UTCJul 23, 20:15 UTC1h 30m
2026-07-23 ENY3563 BOS → IND Jul 23, 16:00 UTCJul 23, 16:40 UTC40m
2026-07-23 ENY3563 BOS → IND Jul 23, 14:30 UTCJul 23, 15:05 UTC35m
2026-07-23 ENY3965 CMH → ORD Jul 23, 11:45 UTCJul 23, 12:15 UTC30m
2026-07-23 ENY4054 CLT → GSO Jul 23, 02:00 UTCJul 23, 02:20 UTC20m
2026-07-23 ENY4054 CLT → GSO Jul 23, 01:55 UTCJul 23, 02:18 UTC23m
2026-07-22 ENY3552 - Jul 22, 21:55 UTCJul 22, 23:00 UTC1h 5m
2026-07-22 ENY3552 - Jul 22, 19:25 UTCJul 22, 20:25 UTC1h 0m
2026-07-22 ENY4178 TYS → ORD Jul 22, 17:05 UTCJul 22, 17:50 UTC45m
2026-07-22 ENY4178 TYS → ORD Jul 22, 15:35 UTCJul 22, 16:15 UTC40m
2026-07-22 ENY4083 SGF → CLT Jul 22, 12:00 UTCJul 22, 13:25 UTC1h 25m
2026-07-22 ENY4017 CLT → SGF Jul 22, 00:35 UTCJul 22, 02:15 UTC1h 40m
2026-07-21 ENY3560 ORD → RDU Jul 21, 21:00 UTCJul 21, 21:45 UTC45m
2026-07-21 ENY3560 ORD → RDU Jul 21, 19:30 UTCJul 21, 20:05 UTC35m
2026-07-21 ENY3844 - Jul 21, 16:15 UTCJul 21, 17:30 UTC1h 15m
2026-07-21 ENY3844 - Jul 21, 13:15 UTCJul 21, 14:25 UTC1h 10m
2026-07-21 ENY3404 PHX → FAR Jul 21, 10:20 UTCJul 21, 11:50 UTC1h 30m
2026-07-21 ENY3404 PHX → FAR Jul 21, 10:13 UTCJul 21, 11:47 UTC1h 34m
2026-07-21 ENY3444 RST → ORD Jul 21, 03:30 UTCJul 21, 04:50 UTC1h 20m
2026-07-20 ENY3633 - Jul 20, 23:55 UTCJul 21, 01:20 UTC1h 25m
2026-07-20 ENY3633 - Jul 20, 21:20 UTCJul 20, 22:40 UTC1h 20m
2026-07-20 ENY3562 CWA → ORD Jul 20, 18:50 UTCJul 20, 19:35 UTC45m
2026-07-20 ENY3562 CWA → ORD Jul 20, 17:20 UTCJul 20, 17:55 UTC35m

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 N227NN page for operator, model, and routing details .

Mode-S A1FC3B frequently asked

What is Mode-S code A1FC3B?
A1FC3B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N227NN.
Where is Mode-S A1FC3B registered?
Mode-S code A1FC3B 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 A1FC3B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1FC3B, octal 50376073, decimal 10,615,867.
What flights does A1FC3B operate?
Mode-S A1FC3B has broadcast 20 distinct callsigns, including ENY3998, ENY3992, ENY3440, ENY4089, ENY3721.