Apparatus

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sensors Mode-S transponder

A21127

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N232NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A21127
Octal
50410447
Decimal
10,621,223
Country
US
Tail
N232NN
Type
E75L
No current signal · last broadcast Jul 26, 20:35 UTC
Flights observed
745
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S A21127.

Country allocation

The ICAO 24-bit address A21127 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
ENY3731 Envoy Air 8 2026-06-11
ENY4138 Envoy Air 7 2026-05-08
ENY4307 Envoy Air 6 2026-05-07
ENY4212 Envoy Air 6 2026-05-13
ENY4202 - 6 2026-07-20
ENY4137 - 6 2026-06-15
ENY3964 Envoy Air 6 2026-06-05
ENY3849 Envoy Air 6 2026-06-15
ENY3485 Envoy Air 6 2026-06-01
ENY3458 - 6 2026-06-27
ENY3389 Envoy Air 6 2026-05-29
ENY4314 - 5 2026-07-03
ENY4182 Envoy Air 5 2026-05-05
ENY4179 - 5 2026-06-19
ENY4098 Envoy Air 5 2026-06-04
ENY3981 Envoy Air 5 2026-07-18
ENY3967 - 5 2026-07-16
ENY3800 - 5 2026-07-17
ENY3687 - 5 2026-07-13
ENY3680 Envoy Air 5 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3419 RDU → CVG Jul 26, 18:10 UTCJul 26, 20:35 UTC2h 25m
2026-07-26 ENY4175 PHX → ICT Jul 26, 14:15 UTCJul 26, 16:40 UTC2h 25m
2026-07-26 ENY3423 PVD → ORD Jul 26, 11:20 UTCJul 26, 13:10 UTC1h 50m
2026-07-26 ENY3423 PVD → ORD Jul 26, 11:16 UTCJul 26, 13:00 UTC1h 44m
2026-07-26 ENY3427 ORD → YYZ Jul 26, 03:15 UTCJul 26, 04:40 UTC1h 25m
2026-07-26 ENY3427 ORD → YYZ Jul 26, 03:11 UTCJul 26, 04:40 UTC1h 29m
2026-07-25 ENY4057 MEM → DCA Jul 25, 23:55 UTCJul 26, 02:10 UTC2h 15m
2026-07-25 ENY4057 MEM → DCA Jul 25, 20:20 UTCJul 25, 23:00 UTC2h 40m
2026-07-25 ENY3337 CLT → BGR Jul 25, 18:05 UTCJul 25, 18:45 UTC40m
2026-07-25 ENY3337 CLT → BGR Jul 25, 16:45 UTCJul 25, 17:00 UTC15m
2026-07-25 ENY3679 SDF → MIA Jul 25, 12:10 UTCJul 25, 15:35 UTC3h 25m
2026-07-25 ENY3680 ORD → MSN Jul 25, 01:25 UTCJul 25, 04:05 UTC2h 40m
2026-07-25 ENY3680 ORD → MSN Jul 25, 01:23 UTCJul 25, 04:15 UTC2h 52m
2026-07-24 ENY3782 PVD → ORD Jul 24, 23:15 UTCJul 25, 00:25 UTC1h 10m
2026-07-24 ENY3782 PVD → ORD Jul 24, 21:15 UTCJul 24, 22:25 UTC1h 10m
2026-07-24 ENY3355 BOS → CMH Jul 24, 18:20 UTCJul 24, 18:50 UTC30m
2026-07-24 ENY3355 BOS → CMH Jul 24, 18:04 UTCJul 24, 18:49 UTC45m
2026-07-24 ENY3355 BOS → CMH Jul 24, 16:30 UTCJul 24, 16:55 UTC25m
2026-07-24 ENY3755 MTY → MIA Jul 24, 12:20 UTCJul 24, 15:10 UTC2h 50m
2026-07-23 ENY3756 MIA → MTY Jul 23, 23:20 UTCJul 24, 02:10 UTC2h 50m
2026-07-23 ENY3927 PWM → ORD Jul 23, 19:05 UTCJul 23, 19:35 UTC30m
2026-07-23 ENY3927 PWM → ORD Jul 23, 18:36 UTCJul 23, 19:28 UTC52m
2026-07-23 ENY3927 PWM → ORD Jul 23, 16:55 UTCJul 23, 17:10 UTC15m
2026-07-23 ENY4039 DFW → ABI Jul 23, 14:25 UTCJul 23, 14:50 UTC25m
2026-07-23 ENY4039 DFW → ABI Jul 23, 12:55 UTCJul 23, 13:10 UTC15m
2026-07-23 ENY3682 OMA → ORD Jul 23, 10:10 UTCJul 23, 11:20 UTC1h 10m
2026-07-23 ENY3920 ORD → OKC Jul 23, 02:45 UTCJul 23, 03:50 UTC1h 5m
2026-07-23 ENY3821 BMI → DFW Jul 23, 00:25 UTCJul 23, 01:30 UTC1h 5m
2026-07-22 ENY3821 BMI → DFW Jul 22, 22:25 UTCJul 22, 23:30 UTC1h 5m
2026-07-22 ENY4325 HRL → DFW Jul 22, 14:35 UTCJul 22, 21:05 UTC6h 30m
2026-07-22 ENY3501 - Jul 22, 12:30 UTCJul 22, 13:05 UTC35m
2026-07-22 ENY3501 - Jul 22, 11:20 UTCJul 22, 12:25 UTC1h 5m
2026-07-22 ENY3501 RDU → MIA Jul 22, 11:18 UTCJul 22, 13:02 UTC1h 44m
2026-07-22 ENY3474 ORD → DSM Jul 22, 01:20 UTCJul 22, 03:00 UTC1h 40m
2026-07-21 ENY3749 MEM → DCA Jul 21, 22:20 UTCJul 21, 23:50 UTC1h 30m
2026-07-21 ENY3749 MEM → DCA Jul 21, 19:40 UTCJul 21, 21:00 UTC1h 20m
2026-07-21 ENY3954 STL → DCA Jul 21, 16:10 UTCJul 21, 18:30 UTC2h 20m
2026-07-21 ENY3954 STL → DCA Jul 21, 12:45 UTCJul 21, 15:10 UTC2h 25m
2026-07-21 ENY3877 ORD → ELP Jul 21, 10:00 UTCJul 21, 10:50 UTC50m
2026-07-21 ENY3876 - Jul 21, 03:00 UTCJul 21, 03:45 UTC45m
2026-07-21 ENY3558 TRI → DFW Jul 21, 00:20 UTCJul 21, 01:55 UTC1h 35m
2026-07-20 ENY3557 CMH → DFW Jul 20, 21:25 UTCJul 20, 23:25 UTC2h 0m
2026-07-20 ENY4202 MTY → DFW Jul 20, 18:42 UTCJul 20, 20:05 UTC1h 23m
2026-07-20 ENY4202 MTY → DFW Jul 20, 18:45 UTCJul 20, 20:10 UTC1h 25m
2026-07-20 ENY4202 - Jul 20, 16:10 UTCJul 20, 17:25 UTC1h 15m
2026-07-20 ENY4073 CMI → DFW Jul 20, 12:40 UTCJul 20, 14:10 UTC1h 30m
2026-07-20 ENY3887 DFW → CMI Jul 20, 01:05 UTCJul 20, 02:45 UTC1h 40m
2026-07-19 ENY3575 MSN → ORD Jul 19, 22:20 UTCJul 19, 23:40 UTC1h 20m
2026-07-19 ENY3575 MSN → ORD Jul 19, 20:10 UTCJul 19, 21:15 UTC1h 5m
2026-07-19 ENY3661 DFW → SGF Jul 19, 17:25 UTCJul 19, 18:40 UTC1h 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 N232NN page for operator, model, and routing details .

Mode-S A21127 frequently asked

What is Mode-S code A21127?
A21127 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N232NN.
Where is Mode-S A21127 registered?
Mode-S code A21127 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 A21127 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 A21127, octal 50410447, decimal 10,621,223.
What flights does A21127 operate?
Mode-S A21127 has broadcast 20 distinct callsigns, including ENY3731, ENY4138, ENY4307, ENY4212, ENY4202.