Apparatus

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sensors Mode-S transponder

A21839

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N234JW · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A21839
Octal
50414071
Decimal
10,623,033
Country
US
Tail
N234JW
Type
E75L
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
767
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A21839.

Country allocation

The ICAO 24-bit address A21839 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
ENY4100 Envoy Air 8 2026-06-10
ENY3689 - 8 2026-07-06
ENY3368 - 7 2026-07-14
ENY4027 - 6 2026-07-16
ENY4005 - 6 2026-06-28
ENY3954 Envoy Air 6 2026-07-26
ENY3749 Envoy Air 6 2026-07-23
ENY3695 Envoy Air 6 2026-04-25
ENY3657 - 6 2026-07-18
ENY3639 Envoy Air 6 2026-05-05
ENY3461 Envoy Air 6 2026-07-03
ENY4237 Envoy Air 5 2026-07-25
ENY4132 Envoy Air 5 2026-05-01
ENY4128 Envoy Air 5 2026-04-28
ENY4097 - 5 2026-07-16
ENY4073 - 5 2026-07-17
ENY4038 - 5 2026-06-23
ENY3978 Envoy Air 5 2026-07-22
ENY3927 Envoy Air 5 2026-07-22
ENY3876 Envoy Air 5 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3939 ORD → MSN Jul 26, 21:00 UTCJul 26, 22:15 UTC1h 15m
2026-07-26 ENY3954 STL → DCA Jul 26, 16:55 UTCJul 26, 19:20 UTC2h 25m
2026-07-26 ENY3954 STL → DCA Jul 26, 13:40 UTCJul 26, 16:05 UTC2h 25m
2026-07-26 ENY4082 LAN → ORD Jul 26, 03:10 UTCJul 26, 04:15 UTC1h 5m
2026-07-26 ENY4082 LAN → ORD Jul 26, 03:04 UTCJul 26, 04:43 UTC1h 39m
2026-07-26 ENY3931 CHS → ORD Jul 26, 00:15 UTCJul 26, 02:20 UTC2h 5m
2026-07-25 ENY4237 MIA → EIS Jul 25, 19:05 UTCJul 25, 19:25 UTC20m
2026-07-25 ENY4237 MIA → EIS Jul 25, 16:55 UTCJul 25, 17:10 UTC15m
2026-07-25 ENY3363 - Jul 25, 15:35 UTCJul 25, 15:55 UTC20m
2026-07-25 ENY3363 - Jul 25, 13:40 UTCJul 25, 14:00 UTC20m
2026-07-25 ENY3662 MSN → AUS Jul 25, 09:15 UTCJul 25, 11:20 UTC2h 5m
2026-07-25 ENY3660 MLI → ORD Jul 25, 00:00 UTCJul 25, 02:15 UTC2h 15m
2026-07-24 ENY3660 MLI → ORD Jul 24, 23:59 UTCJul 25, 02:10 UTC2h 11m
2026-07-24 ENY3465 ORD → CVG Jul 24, 19:05 UTCJul 24, 21:35 UTC2h 30m
2026-07-24 ENY3465 ORD → CVG Jul 24, 18:30 UTCJul 24, 21:28 UTC2h 58m
2026-07-24 ENY4304 DFW → TXK Jul 24, 14:35 UTCJul 24, 16:50 UTC2h 15m
2026-07-24 ENY4304 DFW → TXK Jul 24, 14:33 UTCJul 24, 17:24 UTC2h 51m
2026-07-24 ENY3501 LIT → ORD Jul 24, 11:15 UTCJul 24, 13:00 UTC1h 45m
2026-07-24 ENY3474 ORD → DSM Jul 24, 01:20 UTCJul 24, 03:05 UTC1h 45m
2026-07-24 ENY3474 ORD → DSM Jul 24, 01:19 UTCJul 24, 03:01 UTC1h 42m
2026-07-23 ENY3749 MEM → DCA Jul 23, 22:10 UTCJul 23, 23:35 UTC1h 25m
2026-07-23 ENY3749 MEM → DCA Jul 23, 22:09 UTCJul 23, 23:35 UTC1h 26m
2026-07-23 ENY3749 MEM → DCA Jul 23, 19:40 UTCJul 23, 21:00 UTC1h 20m
2026-07-23 ENY3954 STL → DCA Jul 23, 16:05 UTCJul 23, 18:40 UTC2h 35m
2026-07-23 ENY3954 STL → DCA Jul 23, 12:50 UTCJul 23, 15:15 UTC2h 25m
2026-07-23 ENY3858 TLH → MIA Jul 23, 10:10 UTCJul 23, 11:10 UTC1h 0m
2026-07-23 ENY3585 STS → DFW Jul 23, 02:50 UTCJul 23, 03:50 UTC1h 0m
2026-07-22 ENY3629 MIA → AZS Jul 22, 23:40 UTCJul 23, 01:15 UTC1h 35m
2026-07-22 ENY3629 MIA → AZS Jul 22, 21:10 UTCJul 22, 22:35 UTC1h 25m
2026-07-22 ENY3927 PWM → ORD Jul 22, 19:05 UTCJul 22, 19:35 UTC30m
2026-07-22 ENY3927 PWM → ORD Jul 22, 16:55 UTCJul 22, 17:15 UTC20m
2026-07-22 ENY3978 GSP → ORD Jul 22, 14:55 UTCJul 22, 15:15 UTC20m
2026-07-22 ENY3978 GSP → ORD Jul 22, 14:30 UTCJul 22, 15:14 UTC44m
2026-07-22 ENY3978 GSP → ORD Jul 22, 13:05 UTCJul 22, 13:25 UTC20m
2026-07-22 ENY3662 MSN → AUS Jul 22, 11:10 UTCJul 22, 11:35 UTC25m
2026-07-22 ENY3662 MSN → AUS Jul 22, 09:12 UTCJul 22, 11:23 UTC2h 11m
2026-07-22 ENY3550 CVG → ORD Jul 22, 02:10 UTCJul 22, 04:25 UTC2h 15m
2026-07-21 ENY3629 MIA → AZS Jul 21, 23:30 UTCJul 22, 01:00 UTC1h 30m
2026-07-21 ENY3629 MIA → AZS Jul 21, 20:50 UTCJul 21, 22:25 UTC1h 35m
2026-07-21 ENY3337 - Jul 21, 18:00 UTCJul 21, 18:25 UTC25m
2026-07-21 ENY3337 - Jul 21, 16:25 UTCJul 21, 16:40 UTC15m
2026-07-21 ENY3820 - Jul 21, 13:45 UTCJul 21, 14:55 UTC1h 10m
2026-07-21 ENY3820 - Jul 21, 11:45 UTCJul 21, 12:55 UTC1h 10m
2026-07-20 ENY4072 CZM → MIA Jul 20, 20:25 UTCJul 20, 21:40 UTC1h 15m
2026-07-20 ENY4072 CZM → MIA Jul 20, 20:24 UTCJul 20, 21:40 UTC1h 16m
2026-07-20 ENY4072 CZM → MIA Jul 20, 18:05 UTCJul 20, 19:25 UTC1h 20m
2026-07-20 ENY4177 - Jul 20, 16:20 UTCJul 20, 16:45 UTC25m
2026-07-20 ENY4177 - Jul 20, 15:05 UTCJul 20, 15:15 UTC10m
2026-07-20 ENY3423 - Jul 20, 12:05 UTCJul 20, 13:45 UTC1h 40m
2026-07-20 ENY3427 ORD → YYZ Jul 20, 03:10 UTCJul 20, 04:40 UTC1h 30m

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 N234JW page for operator, model, and routing details .

Mode-S A21839 frequently asked

What is Mode-S code A21839?
A21839 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N234JW.
Where is Mode-S A21839 registered?
Mode-S code A21839 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 A21839 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 A21839, octal 50414071, decimal 10,623,033.
What flights does A21839 operate?
Mode-S A21839 has broadcast 20 distinct callsigns, including ENY4100, ENY3689, ENY3368, ENY4027, ENY4005.