Apparatus

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sensors Mode-S transponder

ADF4C6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N999HE · CESSNA 172 Skyhawk · operated by PINNACLE AVIATION SERVICES INC

Hex
ADF4C6
Octal
53372306
Decimal
11,400,390
Country
US
Tail
N999HE
Type
C172
No current signal · last broadcast 13h ago
Flights observed
124
Distinct callsigns
1
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S ADF4C6.

Country allocation

The ICAO 24-bit address ADF4C6 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
N999HE - 124 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N999HE - Jul 13, 21:25 UTCJul 13, 22:25 UTC1h 0m
2026-07-13 N999HE - Jul 13, 17:00 UTCJul 13, 17:55 UTC55m
2026-07-12 N999HE - Jul 12, 17:50 UTCJul 12, 19:01 UTC1h 10m
2026-07-10 N999HE - Jul 10, 21:45 UTCJul 10, 22:10 UTC25m
2026-07-10 N999HE - Jul 10, 20:00 UTCJul 10, 20:20 UTC20m
2026-07-09 N999HE - Jul 9, 20:25 UTCJul 9, 23:25 UTC3h 0m
2026-07-08 N999HE CLD → CLD Jul 8, 21:30 UTCJul 8, 22:10 UTC40m
2026-07-08 N999HE - Jul 8, 19:15 UTCJul 8, 20:20 UTC1h 5m
2026-07-08 N999HE - Jul 8, 16:50 UTCJul 8, 18:00 UTC1h 10m
2026-07-07 N999HE CLD → CLD Jul 7, 18:50 UTCJul 7, 19:20 UTC30m
2026-07-06 N999HE CLD → CLD Jul 6, 21:35 UTCJul 6, 22:45 UTC1h 10m
2026-07-06 N999HE - Jul 6, 16:25 UTCJul 6, 17:20 UTC55m
2026-07-05 N999HE - Jul 5, 21:05 UTCJul 5, 22:15 UTC1h 10m
2026-07-05 N999HE CLD → SBD Jul 5, 20:10 UTCJul 5, 21:00 UTC50m
2026-06-29 N999HE - Jun 29, 21:34 UTCJun 29, 21:54 UTC20m
2026-06-29 N999HE - Jun 29, 18:25 UTCJun 29, 18:44 UTC20m
2026-06-29 N999HE - Jun 29, 16:35 UTCJun 29, 17:14 UTC40m
2026-06-28 N999HE - Jun 28, 21:30 UTCJun 28, 22:55 UTC1h 25m
2026-06-27 N999HE - Jun 27, 21:29 UTCJun 27, 21:50 UTC20m
2026-06-27 N999HE - Jun 27, 19:49 UTCJun 27, 20:39 UTC50m
2026-06-26 N999HE CLD → CLD Jun 26, 21:45 UTCJun 26, 23:09 UTC1h 25m
2026-06-26 N999HE - Jun 26, 20:20 UTCJun 26, 20:44 UTC25m
2026-06-25 N999HE CLD → CLD Jun 25, 22:29 UTCJun 25, 23:24 UTC55m
2026-06-25 N999HE - Jun 25, 19:44 UTCJun 25, 20:39 UTC55m
2026-06-25 N999HE - Jun 25, 18:34 UTCJun 25, 18:45 UTC10m
2026-06-25 N999HE CLD → OCN Jun 25, 17:30 UTCJun 25, 18:04 UTC35m
2026-06-23 N999HE BFL → CLD Jun 23, 22:15 UTCJun 23, 23:59 UTC1h 45m
2026-06-23 N999HE - Jun 23, 18:55 UTCJun 23, 20:19 UTC1h 25m
2026-06-21 N999HE CLD → CLD Jun 21, 19:55 UTCJun 21, 21:14 UTC1h 20m
2026-06-20 N999HE CLD → CLD Jun 20, 19:55 UTCJun 20, 20:34 UTC40m
2026-06-18 N999HE CLD → CLD Jun 18, 20:45 UTCJun 18, 21:55 UTC1h 10m
2026-06-17 N999HE CLD → CLD Jun 17, 23:45 UTCJun 18, 00:50 UTC1h 5m
2026-06-16 N999HE CLD → CLD Jun 16, 21:50 UTCJun 16, 22:35 UTC45m
2026-06-15 N999HE - Jun 15, 19:55 UTCJun 15, 20:34 UTC40m
2026-06-14 N999HE - Jun 14, 19:55 UTCJun 14, 20:45 UTC50m
2026-06-14 N999HE - Jun 14, 00:25 UTCJun 14, 01:50 UTC1h 25m
2026-06-13 N999HE - Jun 13, 21:10 UTCJun 13, 22:00 UTC50m
2026-06-13 N999HE - Jun 13, 17:55 UTCJun 13, 20:05 UTC2h 10m
2026-06-12 N999HE CLD → CLD Jun 12, 17:15 UTCJun 12, 17:35 UTC20m
2026-06-09 N999HE - Jun 9, 21:00 UTCJun 9, 21:40 UTC40m
2026-06-09 N999HE CLD → CLD Jun 9, 19:10 UTCJun 9, 20:05 UTC55m
2026-06-08 N999HE CLD → CLD Jun 8, 22:45 UTCJun 8, 23:30 UTC45m
2026-06-08 N999HE CLD → CLD Jun 8, 18:35 UTCJun 8, 19:25 UTC50m
2026-06-07 N999HE - Jun 7, 19:25 UTCJun 7, 19:55 UTC30m
2026-06-05 N999HE RBK → CLD Jun 5, 21:45 UTCJun 5, 22:30 UTC45m
2026-06-05 N999HE - Jun 5, 20:10 UTCJun 5, 20:25 UTC15m
2026-06-04 N999HE CLD → CLD Jun 4, 22:50 UTCJun 5, 00:25 UTC1h 35m
2026-06-03 N999HE CLD → CLD Jun 3, 22:55 UTCJun 3, 23:45 UTC50m
2026-06-03 N999HE CLD → CLD Jun 3, 19:15 UTCJun 3, 20:30 UTC1h 15m
2026-06-02 N999HE CLD → CLD Jun 2, 23:00 UTCJun 2, 23:40 UTC40m

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 N999HE page for operator, model, and routing details .

Mode-S ADF4C6 frequently asked

What is Mode-S code ADF4C6?
ADF4C6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N999HE.
Where is Mode-S ADF4C6 registered?
Mode-S code ADF4C6 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 ADF4C6 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADF4C6, octal 53372306, decimal 11,400,390.
What flights does ADF4C6 operate?
Mode-S ADF4C6 has broadcast 1 distinct callsign, including N999HE.