Apparatus

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sensors Mode-S transponder

A4A0CF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N398DC · DORNIER 328 · operated by CBG LLC

Hex
A4A0CF
Octal
51120317
Decimal
10,789,071
Country
US
Tail
N398DC
Type
D328
No current signal · last broadcast 9h ago
Flights observed
45
Distinct callsigns
14
Country
US
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S A4A0CF.

Country allocation

The ICAO 24-bit address A4A0CF 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 14 distinct

Callsign Airline Flights Last seen
LYM4804 Key Lime Air 9 2026-05-29
LYM4801 Key Lime Air 9 2026-05-19
LYM3712 Key Lime Air 5 2026-05-19
LYM621 Key Lime Air 4 2026-05-21
LYM3714 Key Lime Air 4 2026-05-18
LYM3585 Key Lime Air 3 2026-05-29
LYM3583 Key Lime Air 3 2026-05-29
LYM3581 Key Lime Air 2 2026-04-28
LYM5418 Key Lime Air 1 2026-05-13
LYM5414 Key Lime Air 1 2026-05-14
LYM5411 Key Lime Air 1 2026-05-14
LYM5407 Key Lime Air 1 2026-05-14
LYM4803 Key Lime Air 1 2026-04-19
LYM3587 Key Lime Air 1 2026-04-28

Recent flights last 45

DateFlightRouteTakeoffLandingDuration
2026-05-29 LYM4804 DEN → PUB May 29, 23:35 UTCMay 30, 00:00 UTC25m
2026-05-29 LYM3585 ALS → DEN May 29, 20:20 UTCMay 29, 20:55 UTC35m
2026-05-29 LYM3583 DEN → ALS May 29, 18:55 UTCMay 29, 19:20 UTC25m
2026-05-21 LYM621 DEN → SJC May 21, 02:15 UTCMay 21, 04:25 UTC2h 10m
2026-05-20 LYM621 DEN → SJC May 20, 23:15 UTCMay 21, 01:10 UTC1h 55m
2026-05-20 LYM621 DEN → SJC May 20, 16:05 UTCMay 20, 18:00 UTC1h 55m
2026-05-20 LYM621 DEN → SJC May 20, 01:15 UTCMay 20, 03:55 UTC2h 40m
2026-05-19 LYM3712 DEN → TEX May 19, 17:50 UTCMay 19, 19:45 UTC1h 55m
2026-05-19 LYM4801 PUB → DEN May 19, 14:10 UTCMay 19, 14:40 UTC30m
2026-05-19 LYM4804 DEN → PUB May 19, 00:10 UTCMay 19, 00:35 UTC25m
2026-05-18 LYM3714 TEX → DEN May 18, 20:25 UTCMay 18, 20:55 UTC30m
2026-05-18 LYM3712 DEN → TEX May 18, 17:30 UTCMay 18, 18:05 UTC35m
2026-05-18 LYM4801 PUB → DEN May 18, 13:45 UTCMay 18, 14:15 UTC30m
2026-05-18 LYM4804 DEN → PUB May 18, 00:35 UTCMay 18, 01:05 UTC30m
2026-05-17 LYM3714 TEX → DEN May 17, 18:55 UTCMay 17, 19:55 UTC1h 0m
2026-05-17 LYM3712 DEN → TEX May 17, 17:35 UTCMay 17, 18:20 UTC45m
2026-05-17 LYM4801 PUB → DEN May 17, 14:10 UTCMay 17, 14:40 UTC30m
2026-05-17 LYM4804 DEN → PUB May 17, 00:10 UTCMay 17, 00:30 UTC20m
2026-05-16 LYM3714 TEX → DEN May 16, 18:50 UTCMay 16, 19:50 UTC1h 0m
2026-05-16 LYM3712 DEN → TEX May 16, 17:30 UTCMay 16, 18:15 UTC45m
2026-05-16 LYM4801 PUB → DEN May 16, 13:41 UTCMay 16, 14:11 UTC30m
2026-05-15 LYM4804 DEN → PUB May 15, 23:45 UTCMay 16, 00:05 UTC20m
2026-05-15 LYM3714 TEX → DEN May 15, 19:00 UTCMay 15, 19:40 UTC40m
2026-05-15 LYM3712 DEN → TEX May 15, 17:40 UTCMay 15, 18:20 UTC40m
2026-05-15 LYM4801 PUB → DEN May 15, 13:45 UTCMay 15, 14:25 UTC40m
2026-05-15 LYM4804 DEN → PUB May 15, 00:45 UTCMay 15, 01:05 UTC20m
2026-05-14 LYM5414 CVN → DEN May 14, 18:30 UTCMay 14, 19:40 UTC1h 10m
2026-05-14 LYM5411 DFW → CVN May 14, 16:40 UTCMay 14, 17:30 UTC50m
2026-05-14 LYM5407 CVN → DFW May 14, 14:20 UTCMay 14, 15:20 UTC1h 0m
2026-05-13 LYM5418 DEN → CVN May 13, 23:10 UTCMay 13, 23:50 UTC40m
2026-05-13 LYM4801 PUB → DEN May 13, 13:50 UTCMay 13, 14:25 UTC35m
2026-05-12 LYM4804 DEN → PUB May 12, 23:55 UTCMay 13, 00:15 UTC20m
2026-05-12 LYM4801 PUB → DEN May 12, 13:55 UTCMay 12, 14:30 UTC35m
2026-05-11 LYM4801 PUB → DEN May 11, 13:40 UTCMay 11, 14:10 UTC30m
2026-05-10 LYM4804 DEN → PUB May 10, 23:50 UTCMay 11, 00:15 UTC25m
2026-04-28 LYM3581 ALS → DEN Apr 28, 14:20 UTCApr 28, 14:50 UTC30m
2026-04-28 LYM3587 DEN → ALS Apr 28, 00:50 UTCApr 28, 01:20 UTC30m
2026-04-20 LYM3585 ALS → DEN Apr 20, 20:05 UTCApr 20, 20:35 UTC30m
2026-04-20 LYM3583 DEN → ALS Apr 20, 18:45 UTCApr 20, 19:15 UTC30m
2026-04-20 LYM4801 PUB → DEN Apr 20, 13:45 UTCApr 20, 14:20 UTC35m
2026-04-19 LYM4804 DEN → PUB Apr 19, 23:50 UTCApr 20, 00:15 UTC25m
2026-04-19 LYM4803 PUB → DEN Apr 19, 21:45 UTCApr 19, 23:00 UTC1h 15m
2026-04-19 LYM3585 ALS → DEN Apr 19, 20:15 UTCApr 19, 20:50 UTC35m
2026-04-19 LYM3583 DEN → ALS Apr 19, 18:55 UTCApr 19, 19:20 UTC25m
2026-04-13 LYM3581 ALS → DEN Apr 13, 14:10 UTCApr 13, 14:45 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 N398DC page for operator, model, and routing details .

Mode-S A4A0CF frequently asked

What is Mode-S code A4A0CF?
A4A0CF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N398DC.
Where is Mode-S A4A0CF registered?
Mode-S code A4A0CF 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 A4A0CF broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4A0CF, octal 51120317, decimal 10,789,071.
What flights does A4A0CF operate?
Mode-S A4A0CF has broadcast 14 distinct callsigns, including LYM4804, LYM4801, LYM3712, LYM621, LYM3714.