Apparatus

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sensors Mode-S transponder

AC868D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N906MD · CESSNA 172 Skyhawk · operated by FIVE RIVERS FLIGHT TRAINING LLC

Hex
AC868D
Octal
53103215
Decimal
11,306,637
Country
US
Tail
N906MD
Type
C172
No current signal · last broadcast 23d ago
Flights observed
187
Distinct callsigns
1
Country
US
Last broadcast
23d ago

Last known position

Most recent position reported by Mode-S AC868D.

Country allocation

The ICAO 24-bit address AC868D 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
N906MD - 187 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N906MD - Jul 26, 16:05 UTCJul 26, 17:10 UTC1h 5m
2026-07-24 N906MD - Jul 24, 20:55 UTCJul 24, 22:20 UTC1h 25m
2026-07-24 N906MD - Jul 24, 00:50 UTCJul 24, 01:30 UTC40m
2026-07-23 N906MD - Jul 23, 17:50 UTCJul 23, 18:55 UTC1h 5m
2026-07-23 N906MD - Jul 23, 00:40 UTCJul 23, 01:45 UTC1h 5m
2026-07-22 N906MD - Jul 22, 19:45 UTCJul 22, 21:35 UTC1h 50m
2026-07-21 N906MD - Jul 21, 16:55 UTCJul 21, 17:30 UTC35m
2026-07-21 N906MD - Jul 21, 15:40 UTCJul 21, 16:45 UTC1h 5m
2026-07-19 N906MD LVK → LVK Jul 19, 18:40 UTCJul 19, 19:50 UTC1h 10m
2026-07-19 N906MD - Jul 19, 16:20 UTCJul 19, 17:35 UTC1h 15m
2026-07-18 N906MD - Jul 18, 18:00 UTCJul 18, 19:20 UTC1h 20m
2026-07-18 N906MD - Jul 18, 01:10 UTCJul 18, 02:40 UTC1h 30m
2026-07-17 N906MD - Jul 17, 22:29 UTCJul 17, 23:14 UTC45m
2026-07-17 N906MD - Jul 17, 19:49 UTCJul 17, 20:35 UTC45m
2026-07-17 N906MD - Jul 17, 16:24 UTCJul 17, 17:40 UTC1h 15m
2026-07-17 N906MD - Jul 17, 04:10 UTCJul 17, 04:54 UTC45m
2026-07-16 N906MD - Jul 16, 18:55 UTCJul 16, 20:25 UTC1h 30m
2026-07-16 N906MD - Jul 16, 16:40 UTCJul 16, 18:00 UTC1h 20m
2026-07-16 N906MD - Jul 16, 01:05 UTCJul 16, 01:55 UTC50m
2026-07-15 N906MD LVK → LVK Jul 15, 17:45 UTCJul 15, 18:45 UTC1h 0m
2026-07-14 N906MD LVK → LVK Jul 14, 23:50 UTCJul 15, 00:35 UTC45m
2026-07-14 N906MD LVK → LVK Jul 14, 19:25 UTCJul 14, 20:10 UTC45m
2026-07-14 N906MD - Jul 14, 17:35 UTCJul 14, 18:35 UTC1h 0m
2026-07-14 N906MD LVK → LVK Jul 14, 01:35 UTCJul 14, 02:40 UTC1h 5m
2026-07-13 N906MD - Jul 13, 23:35 UTCJul 14, 00:30 UTC55m
2026-07-12 N906MD - Jul 12, 22:15 UTCJul 13, 00:35 UTC2h 20m
2026-07-12 N906MD LVK → LVK Jul 12, 17:15 UTCJul 12, 18:45 UTC1h 30m
2026-07-11 N906MD - Jul 11, 20:40 UTCJul 11, 21:50 UTC1h 10m
2026-07-11 N906MD - Jul 11, 19:35 UTCJul 11, 19:50 UTC15m
2026-07-11 N906MD - Jul 11, 18:35 UTCJul 11, 19:00 UTC25m
2026-07-11 N906MD - Jul 11, 17:35 UTCJul 11, 17:55 UTC20m
2026-07-11 N906MD - Jul 11, 16:00 UTCJul 11, 16:10 UTC10m
2026-07-11 N906MD LVK → LVK Jul 11, 01:40 UTCJul 11, 02:40 UTC1h 0m
2026-07-10 N906MD - Jul 10, 16:30 UTCJul 10, 17:45 UTC1h 15m
2026-07-10 N906MD - Jul 10, 00:05 UTCJul 10, 00:40 UTC35m
2026-07-09 N906MD - Jul 9, 22:15 UTCJul 9, 22:55 UTC40m
2026-07-09 N906MD - Jul 9, 18:20 UTCJul 9, 20:00 UTC1h 40m
2026-07-09 N906MD - Jul 9, 15:45 UTCJul 9, 17:00 UTC1h 15m
2026-07-08 N906MD - Jul 8, 20:00 UTCJul 8, 20:55 UTC55m
2026-07-08 N906MD - Jul 8, 18:30 UTCJul 8, 18:40 UTC10m
2026-07-08 N906MD - Jul 8, 17:40 UTCJul 8, 18:25 UTC45m
2026-07-08 N906MD - Jul 8, 02:35 UTCJul 8, 03:20 UTC45m
2026-07-08 N906MD - Jul 8, 01:20 UTCJul 8, 02:05 UTC45m
2026-07-07 N906MD - Jul 7, 22:05 UTCJul 7, 22:55 UTC50m
2026-07-05 N906MD - Jul 5, 22:50 UTCJul 6, 00:45 UTC1h 55m
2026-07-05 N906MD - Jul 5, 19:20 UTCJul 5, 20:20 UTC1h 0m
2026-07-05 N906MD - Jul 5, 17:25 UTCJul 5, 18:20 UTC55m
2026-07-04 N906MD LVK → LVK Jul 4, 21:35 UTCJul 4, 22:30 UTC55m
2026-07-04 N906MD - Jul 4, 18:45 UTCJul 4, 19:35 UTC50m
2026-07-02 N906MD - Jul 2, 20:40 UTCJul 2, 21:20 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 N906MD page for operator, model, and routing details .

Mode-S AC868D frequently asked

What is Mode-S code AC868D?
AC868D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N906MD.
Where is Mode-S AC868D registered?
Mode-S code AC868D 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 AC868D broadcasting right now?
No active broadcast right now. Last signal was 23d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC868D, octal 53103215, decimal 11,306,637.
What flights does AC868D operate?
Mode-S AC868D has broadcast 1 distinct callsign, including N906MD.