Apparatus

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sensors Mode-S transponder

A4D84D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N411ET · NORTH AMERICAN ROCKWELL Commander 500 · operated by CENTRAL AIRLINES INC

Hex
A4D84D
Octal
51154115
Decimal
10,803,277
Country
US
Tail
N411ET
Type
AC50
No current signal · last broadcast 11d ago
Flights observed
109
Distinct callsigns
17
Country
US
Last broadcast
11d ago

Last known position

Most recent position reported by Mode-S A4D84D.

Country allocation

The ICAO 24-bit address A4D84D 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 17 distinct

Callsign Airline Flights Last seen
CTL10 - 29 2026-06-16
CTL18 - 25 2026-07-09
CTL15 - 12 2026-07-25
CTL3 - 7 2026-06-13
CTL19 - 7 2026-07-09
CTL11 - 5 2026-06-01
CTL104 - 4 2026-04-30
CTL103 - 4 2026-06-23
CTL14 - 3 2026-05-29
CTL8 - 2 2026-05-02
CTL344 - 2 2026-05-30
CTL305 - 2 2026-06-23
CTL12 - 2 2026-07-20
CTL107 - 2 2026-05-22
CTL386 - 1 2026-05-16
CTL377 - 1 2026-04-28
CTL018 - 1 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CTL15 - Jul 25, 17:15 UTCJul 25, 18:20 UTC1h 5m
2026-07-25 CTL15 - Jul 25, 15:20 UTCJul 25, 15:45 UTC25m
2026-07-25 CTL15 - Jul 25, 09:20 UTCJul 25, 10:05 UTC45m
2026-07-25 CTL15 - Jul 25, 05:40 UTCJul 25, 07:50 UTC2h 10m
2026-07-25 CTL15 - Jul 25, 03:20 UTCJul 25, 05:30 UTC2h 10m
2026-07-21 CTL15 - Jul 21, 18:45 UTCJul 21, 19:25 UTC40m
2026-07-21 CTL15 - Jul 21, 16:25 UTCJul 21, 16:50 UTC25m
2026-07-21 CTL15 - Jul 21, 10:55 UTCJul 21, 11:25 UTC30m
2026-07-21 CTL15 - Jul 21, 07:10 UTCJul 21, 09:20 UTC2h 10m
2026-07-21 CTL15 MSP → MSP Jul 21, 06:55 UTCJul 21, 07:00 UTC5m
2026-07-21 CTL15 - Jul 21, 06:10 UTCJul 21, 06:25 UTC15m
2026-07-21 CTL15 - Jul 21, 03:25 UTCJul 21, 05:35 UTC2h 10m
2026-07-20 CTL12 - Jul 20, 15:30 UTCJul 20, 16:40 UTC1h 10m
2026-07-20 CTL12 - Jul 20, 09:25 UTCJul 20, 11:10 UTC1h 45m
2026-07-09 CTL19 - Jul 9, 17:55 UTCJul 9, 18:15 UTC20m
2026-07-09 CTL18 - Jul 9, 05:20 UTCJul 9, 06:40 UTC1h 20m
2026-07-08 CTL18 - Jul 8, 09:05 UTCJul 8, 10:15 UTC1h 10m
2026-07-08 CTL18 SUS → JCI Jul 8, 05:20 UTCJul 8, 06:40 UTC1h 20m
2026-07-07 CTL18 - Jul 7, 09:00 UTCJul 7, 10:15 UTC1h 15m
2026-07-07 CTL18 - Jul 7, 05:35 UTCJul 7, 06:50 UTC1h 15m
2026-07-03 CTL18 - Jul 3, 09:15 UTCJul 3, 10:25 UTC1h 10m
2026-07-03 CTL18 - Jul 3, 05:20 UTCJul 3, 06:50 UTC1h 30m
2026-07-02 CTL18 JCI → SUS Jul 2, 08:55 UTCJul 2, 10:05 UTC1h 10m
2026-07-02 CTL18 - Jul 2, 06:15 UTCJul 2, 06:45 UTC30m
2026-07-02 CTL18 - Jul 2, 05:20 UTCJul 2, 05:45 UTC25m
2026-07-01 CTL18 - Jul 1, 09:00 UTCJul 1, 10:10 UTC1h 10m
2026-07-01 CTL19 - Jul 1, 07:20 UTCJul 1, 08:25 UTC1h 5m
2026-07-01 CTL19 - Jul 1, 03:55 UTCJul 1, 05:25 UTC1h 30m
2026-06-30 CTL19 - Jun 30, 08:55 UTCJun 30, 09:05 UTC10m
2026-06-30 CTL19 - Jun 30, 06:50 UTCJun 30, 08:20 UTC1h 30m
2026-06-30 CTL19 - Jun 30, 04:00 UTCJun 30, 05:25 UTC1h 25m
2026-06-25 CTL19 - Jun 25, 09:25 UTCJun 25, 09:40 UTC15m
2026-06-25 CTL18 - Jun 25, 05:55 UTCJun 25, 07:15 UTC1h 20m
2026-06-24 CTL18 - Jun 24, 09:00 UTCJun 24, 10:10 UTC1h 10m
2026-06-24 CTL018 - Jun 24, 06:25 UTCJun 24, 07:40 UTC1h 15m
2026-06-23 CTL305 - Jun 23, 17:39 UTCJun 23, 19:15 UTC1h 35m
2026-06-23 CTL103 - Jun 23, 15:50 UTCJun 23, 17:04 UTC1h 15m
2026-06-23 CTL103 - Jun 23, 14:10 UTCJun 23, 14:19 UTC10m
2026-06-23 CTL18 - Jun 23, 09:09 UTCJun 23, 10:19 UTC1h 10m
2026-06-23 CTL18 SUS → JCI Jun 23, 05:34 UTCJun 23, 06:55 UTC1h 20m
2026-06-20 CTL18 - Jun 20, 09:34 UTCJun 20, 10:34 UTC1h 0m
2026-06-20 CTL18 - Jun 20, 05:14 UTCJun 20, 06:39 UTC1h 25m
2026-06-17 CTL18 - Jun 17, 09:00 UTCJun 17, 10:05 UTC1h 5m
2026-06-17 CTL18 - Jun 17, 05:35 UTCJun 17, 07:00 UTC1h 25m
2026-06-16 CTL103 - Jun 16, 15:35 UTCJun 16, 17:35 UTC2h 0m
2026-06-16 CTL103 JXN → MDW Jun 16, 13:44 UTCJun 16, 14:50 UTC1h 5m
2026-06-16 CTL10 - Jun 16, 11:20 UTCJun 16, 12:39 UTC1h 20m
2026-06-16 CTL10 - Jun 16, 07:50 UTCJun 16, 08:55 UTC1h 5m
2026-06-13 CTL3 - Jun 13, 06:00 UTCJun 13, 09:05 UTC3h 5m
2026-06-13 CTL3 JXN → PTK Jun 13, 04:40 UTCJun 13, 05:05 UTC25m

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 N411ET page for operator, model, and routing details .

Mode-S A4D84D frequently asked

What is Mode-S code A4D84D?
A4D84D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N411ET.
Where is Mode-S A4D84D registered?
Mode-S code A4D84D 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 A4D84D broadcasting right now?
No active broadcast right now. Last signal was 11d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4D84D, octal 51154115, decimal 10,803,277.
What flights does A4D84D operate?
Mode-S A4D84D has broadcast 17 distinct callsigns, including CTL10, CTL18, CTL15, CTL3, CTL19.