Apparatus

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sensors Mode-S transponder

A3C21A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N341MB · operated by AMERICAN AIRLINES INC

Hex
A3C21A
Octal
50741032
Decimal
10,732,058
Country
US
Tail
N341MB
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
725
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A3C21A.

Country allocation

The ICAO 24-bit address A3C21A 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
ENY3689 Envoy Air 8 2026-07-22
ENY3381 - 8 2026-07-17
ENY4263 - 7 2026-06-28
ENY4237 - 7 2026-07-13
ENY4152 - 7 2026-07-16
ENY3954 Envoy Air 7 2026-06-03
ENY4314 - 6 2026-07-09
ENY4009 - 6 2026-07-20
ENY3934 Envoy Air 6 2026-05-16
ENY3717 Envoy Air 6 2026-07-24
ENY3420 Envoy Air 6 2026-06-04
ENY3417 Envoy Air 6 2026-05-09
ENY3363 - 6 2026-07-13
ENY4122 Envoy Air 5 2026-05-14
ENY4010 - 5 2026-06-27
ENY3965 - 5 2026-07-08
ENY3961 - 5 2026-06-18
ENY3883 - 5 2026-06-26
ENY3842 Envoy Air 5 2026-07-22
ENY3821 - 5 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3575 MSN → ORD Jul 26, 22:15 UTCJul 26, 22:30 UTC15m
2026-07-26 ENY3575 MSN → ORD Jul 26, 20:10 UTCJul 26, 21:15 UTC1h 5m
2026-07-26 ENY3503 YYZ → ORD Jul 26, 15:10 UTCJul 26, 16:50 UTC1h 40m
2026-07-26 ENY3503 YYZ → ORD Jul 26, 15:08 UTCJul 26, 16:45 UTC1h 37m
2026-07-26 ENY3503 YYZ → ORD Jul 26, 12:45 UTCJul 26, 14:25 UTC1h 40m
2026-07-26 ENY3411 GCK → DFW Jul 26, 10:10 UTCJul 26, 11:05 UTC55m
2026-07-26 ENY3357 ELP → AUS Jul 26, 03:10 UTCJul 26, 03:55 UTC45m
2026-07-26 ENY3357 ELP → AUS Jul 26, 03:06 UTCJul 26, 04:05 UTC59m
2026-07-26 ENY3729 CMH → MIA Jul 26, 00:45 UTCJul 26, 01:25 UTC40m
2026-07-26 ENY3729 CMH → MIA Jul 26, 00:44 UTCJul 26, 01:19 UTC35m
2026-07-25 ENY3729 CMH → MIA Jul 25, 23:20 UTCJul 26, 00:05 UTC45m
2026-07-25 ENY3860 AUS → MSY Jul 25, 19:18 UTCJul 25, 21:57 UTC2h 39m
2026-07-25 ENY3860 AUS → MSY Jul 25, 14:55 UTCJul 25, 22:00 UTC7h 5m
2026-07-25 ENY3373 MHK → DFW Jul 25, 11:05 UTCJul 25, 13:10 UTC2h 5m
2026-07-25 ENY3377 BUF → ORD Jul 25, 02:30 UTCJul 25, 04:00 UTC1h 30m
2026-07-24 ENY3717 ORD → PIT Jul 24, 23:55 UTCJul 25, 00:35 UTC40m
2026-07-24 ENY3717 ORD → PIT Jul 24, 22:20 UTCJul 24, 22:50 UTC30m
2026-07-24 ENY3908 BNA → ORD Jul 24, 19:05 UTCJul 24, 20:35 UTC1h 30m
2026-07-24 ENY3891 CHS → ORD Jul 24, 15:45 UTCJul 24, 17:25 UTC1h 40m
2026-07-24 ENY3952 DFW → SGF Jul 24, 12:40 UTCJul 24, 14:50 UTC2h 10m
2026-07-24 ENY3918 FWA → DFW Jul 24, 02:30 UTCJul 24, 04:35 UTC2h 5m
2026-07-24 ENY3918 FWA → DFW Jul 24, 02:29 UTCJul 24, 04:39 UTC2h 10m
2026-07-24 ENY3504 XNA → DFW Jul 24, 00:05 UTCJul 24, 01:25 UTC1h 20m
2026-07-23 ENY3504 XNA → DFW Jul 23, 21:30 UTCJul 23, 22:30 UTC1h 0m
2026-07-23 ENY3986 HRL → DFW Jul 23, 18:00 UTCJul 23, 20:00 UTC2h 0m
2026-07-23 ENY3986 HRL → DFW Jul 23, 14:55 UTCJul 23, 16:50 UTC1h 55m
2026-07-23 ENY4066 RNO → PHX Jul 23, 11:05 UTCJul 23, 13:15 UTC2h 10m
2026-07-23 ENY4066 RNO → PHX Jul 23, 11:02 UTCJul 23, 13:13 UTC2h 11m
2026-07-23 ENY4064 ORD → EVV Jul 23, 01:25 UTCJul 23, 03:25 UTC2h 0m
2026-07-22 ENY3689 BOS → IND Jul 22, 22:40 UTCJul 22, 23:50 UTC1h 10m
2026-07-22 ENY3689 BOS → IND Jul 22, 22:31 UTCJul 22, 23:46 UTC1h 15m
2026-07-22 ENY3689 BOS → IND Jul 22, 20:40 UTCJul 22, 21:45 UTC1h 5m
2026-07-22 ENY3384 CHS → DCA Jul 22, 18:30 UTCJul 22, 19:20 UTC50m
2026-07-22 ENY3384 CHS → DCA Jul 22, 16:40 UTCJul 22, 17:15 UTC35m
2026-07-22 ENY3568 MAF → DFW Jul 22, 14:20 UTCJul 22, 15:05 UTC45m
2026-07-22 ENY3568 MAF → DFW Jul 22, 14:15 UTCJul 22, 14:59 UTC44m
2026-07-22 ENY3593 DCA → BOS Jul 22, 12:40 UTCJul 22, 13:20 UTC40m
2026-07-22 ENY3593 DCA → BOS Jul 22, 12:35 UTCJul 22, 13:19 UTC44m
2026-07-22 ENY3842 ORD → DTW Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 ENY3963 IND → ORD Jul 22, 02:30 UTCJul 22, 03:30 UTC1h 0m
2026-07-21 ENY3932 IND → DCA Jul 21, 23:25 UTCJul 22, 01:20 UTC1h 55m
2026-07-21 ENY3932 IND → DCA Jul 21, 20:35 UTCJul 21, 22:15 UTC1h 40m
2026-07-21 ENY3606 ORD → YYZ Jul 21, 17:45 UTCJul 21, 19:00 UTC1h 15m
2026-07-21 ENY3606 ORD → YYZ Jul 21, 15:20 UTCJul 21, 16:30 UTC1h 10m
2026-07-21 ENY3496 MLI → DFW Jul 21, 11:55 UTCJul 21, 14:05 UTC2h 10m
2026-07-20 ENY3499 TRI → DFW Jul 20, 23:45 UTCJul 21, 01:20 UTC1h 35m
2026-07-20 ENY4009 - Jul 20, 19:40 UTCJul 20, 21:30 UTC1h 50m
2026-07-20 ENY4009 ILM → ORD Jul 20, 19:35 UTCJul 20, 21:27 UTC1h 52m
2026-07-20 ENY4009 - Jul 20, 16:50 UTCJul 20, 18:20 UTC1h 30m
2026-07-20 ENY4104 CVG → BOS Jul 20, 14:15 UTCJul 20, 15:05 UTC50m

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 N341MB page for operator, model, and routing details .

Mode-S A3C21A frequently asked

What is Mode-S code A3C21A?
A3C21A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N341MB.
Where is Mode-S A3C21A registered?
Mode-S code A3C21A 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 A3C21A 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 A3C21A, octal 50741032, decimal 10,732,058.
What flights does A3C21A operate?
Mode-S A3C21A has broadcast 20 distinct callsigns, including ENY3689, ENY3381, ENY4263, ENY4237, ENY4152.