Apparatus

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sensors Mode-S transponder

A6DE16

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N54102 · CESSNA 172 Skyhawk · operated by ADRIATIC HOLDINGS LLC

Hex
A6DE16
Octal
51557026
Decimal
10,935,830
Country
US
Tail
N54102
Type
C172
No current signal · last broadcast 5h ago
Flights observed
320
Distinct callsigns
1
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A6DE16.

Country allocation

The ICAO 24-bit address A6DE16 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 1 distinct

Callsign Airline Flights Last seen
N54102 - 320 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 N54102 RHV → RHV Jul 18, 02:09 UTCJul 18, 02:19 UTC10m
2026-07-18 N54102 - Jul 18, 00:55 UTCJul 18, 02:00 UTC1h 5m
2026-07-17 N54102 - Jul 17, 22:10 UTCJul 17, 22:55 UTC45m
2026-07-17 N54102 - Jul 17, 19:09 UTCJul 17, 19:49 UTC40m
2026-07-17 N54102 - Jul 17, 17:15 UTCJul 17, 17:44 UTC30m
2026-07-17 N54102 - Jul 17, 16:00 UTCJul 17, 16:34 UTC35m
2026-07-17 N54102 RHV → RHV Jul 17, 04:35 UTCJul 17, 04:49 UTC15m
2026-07-17 N54102 RHV → RHV Jul 17, 02:50 UTCJul 17, 02:59 UTC10m
2026-07-17 N54102 RHV → RHV Jul 17, 02:34 UTCJul 17, 02:39 UTC5m
2026-07-17 N54102 RHV → RHV Jul 17, 02:10 UTCJul 17, 02:30 UTC20m
2026-07-17 N54102 RHV → RHV Jul 17, 01:39 UTCJul 17, 02:05 UTC25m
2026-07-16 N54102 RHV → RHV Jul 16, 23:49 UTCJul 17, 00:55 UTC1h 5m
2026-07-16 N54102 - Jul 16, 22:05 UTCJul 16, 22:45 UTC40m
2026-07-16 N54102 - Jul 16, 20:39 UTCJul 16, 21:05 UTC25m
2026-07-16 N54102 RHV → RHV Jul 16, 19:25 UTCJul 16, 19:35 UTC10m
2026-07-16 N54102 RHV → RHV Jul 16, 18:25 UTCJul 16, 19:20 UTC55m
2026-07-16 N54102 - Jul 16, 02:00 UTCJul 16, 03:05 UTC1h 5m
2026-07-15 N54102 RHV → RHV Jul 15, 17:55 UTCJul 15, 18:40 UTC45m
2026-07-15 N54102 RHV → RHV Jul 15, 01:10 UTCJul 15, 03:00 UTC1h 50m
2026-07-14 N54102 - Jul 14, 21:55 UTCJul 14, 22:30 UTC35m
2026-07-14 N54102 - Jul 14, 18:50 UTCJul 14, 19:45 UTC55m
2026-07-14 N54102 RHV → RHV Jul 14, 16:40 UTCJul 14, 17:40 UTC1h 0m
2026-07-14 N54102 APC → RHV Jul 14, 03:00 UTCJul 14, 03:40 UTC40m
2026-07-14 N54102 RHV → APC Jul 14, 01:45 UTCJul 14, 02:35 UTC50m
2026-07-14 N54102 RHV → RHV Jul 14, 00:30 UTCJul 14, 00:45 UTC15m
2026-07-13 N54102 - Jul 13, 21:50 UTCJul 13, 22:10 UTC20m
2026-07-13 N54102 - Jul 13, 20:30 UTCJul 13, 20:55 UTC25m
2026-07-13 N54102 RHV → RHV Jul 13, 17:50 UTCJul 13, 18:55 UTC1h 5m
2026-07-12 N54102 RHV → RHV Jul 12, 19:10 UTCJul 12, 20:01 UTC50m
2026-07-12 N54102 RHV → RHV Jul 12, 01:30 UTCJul 12, 01:40 UTC10m
2026-07-12 N54102 - Jul 12, 00:15 UTCJul 12, 01:05 UTC50m
2026-07-11 N54102 RHV → RHV Jul 11, 20:05 UTCJul 11, 21:45 UTC1h 40m
2026-07-11 N54102 RHV → RHV Jul 11, 04:30 UTCJul 11, 04:35 UTC5m
2026-07-10 N54102 - Jul 10, 23:00 UTCJul 10, 23:35 UTC35m
2026-07-10 N54102 - Jul 10, 21:40 UTCJul 10, 22:25 UTC45m
2026-07-10 N54102 - Jul 10, 19:35 UTCJul 10, 20:25 UTC50m
2026-07-10 N54102 RHV → RHV Jul 10, 01:35 UTCJul 10, 03:40 UTC2h 5m
2026-07-09 N54102 - Jul 9, 21:15 UTCJul 9, 21:45 UTC30m
2026-07-09 N54102 CCR → HWD Jul 9, 20:40 UTCJul 9, 21:05 UTC25m
2026-07-09 N54102 - Jul 9, 19:40 UTCJul 9, 20:25 UTC45m
2026-07-08 N54102 - Jul 8, 23:35 UTCJul 9, 01:35 UTC2h 0m
2026-07-08 N54102 HWD → RHV Jul 8, 21:35 UTCJul 8, 22:30 UTC55m
2026-07-08 N54102 PAO → HWD Jul 8, 21:10 UTCJul 8, 21:25 UTC15m
2026-07-08 N54102 SJC → PAO Jul 8, 20:35 UTCJul 8, 20:55 UTC20m
2026-07-07 N54102 RHV → RHV Jul 7, 00:30 UTCJul 7, 00:50 UTC20m
2026-07-06 N54102 RHV → RHV Jul 6, 18:30 UTCJul 6, 20:05 UTC1h 35m
2026-07-06 N54102 RHV → RHV Jul 6, 16:10 UTCJul 6, 17:25 UTC1h 15m
2026-07-06 N54102 RHV → RHV Jul 6, 00:40 UTCJul 6, 01:55 UTC1h 15m
2026-07-05 N54102 - Jul 5, 22:50 UTCJul 5, 23:30 UTC40m
2026-07-05 N54102 RHV → RHV Jul 5, 19:00 UTCJul 5, 20:05 UTC1h 5m

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 N54102 page for operator, model, and routing details .

Mode-S A6DE16 frequently asked

What is Mode-S code A6DE16?
A6DE16 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N54102.
Where is Mode-S A6DE16 registered?
Mode-S code A6DE16 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 A6DE16 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6DE16, octal 51557026, decimal 10,935,830.
What flights does A6DE16 operate?
Mode-S A6DE16 has broadcast 1 distinct callsign, including N54102.