Apparatus

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sensors Mode-S transponder

A2C5D2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N278SP · CESSNA 172 Skyhawk · operated by SVETFUL AVIATION LLC

Hex
A2C5D2
Octal
50542722
Decimal
10,667,474
Country
US
Tail
N278SP
Type
C172
No current signal · last broadcast 13h ago
Flights observed
158
Distinct callsigns
1
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S A2C5D2.

Country allocation

The ICAO 24-bit address A2C5D2 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
N278SP - 158 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 N278SP - Jul 23, 23:35 UTCJul 24, 01:55 UTC2h 20m
2026-07-23 N278SP - Jul 23, 19:20 UTCJul 23, 22:55 UTC3h 35m
2026-07-23 N278SP - Jul 23, 16:10 UTCJul 23, 16:35 UTC25m
2026-07-23 N278SP - Jul 23, 12:45 UTCJul 23, 13:50 UTC1h 5m
2026-07-23 N278SP TTN → TTN Jul 23, 10:35 UTCJul 23, 11:55 UTC1h 20m
2026-07-23 N278SP TTN → TTN Jul 23, 00:20 UTCJul 23, 04:00 UTC3h 40m
2026-07-21 N278SP - Jul 21, 01:40 UTCJul 21, 02:30 UTC50m
2026-07-20 N278SP - Jul 20, 22:45 UTCJul 20, 23:10 UTC25m
2026-07-20 N278SP - Jul 20, 21:15 UTCJul 20, 21:30 UTC15m
2026-07-20 N278SP - Jul 20, 17:35 UTCJul 20, 19:10 UTC1h 35m
2026-07-20 N278SP - Jul 20, 14:00 UTCJul 20, 14:35 UTC35m
2026-07-20 N278SP - Jul 20, 13:40 UTCJul 20, 13:55 UTC15m
2026-07-09 N278SP - Jul 9, 00:10 UTCJul 9, 00:45 UTC35m
2026-07-08 N278SP - Jul 8, 23:20 UTCJul 9, 00:05 UTC45m
2026-07-08 N278SP TTN → TTN Jul 8, 19:00 UTCJul 8, 19:35 UTC35m
2026-07-05 N278SP - Jul 5, 11:50 UTCJul 5, 13:20 UTC1h 30m
2026-07-03 N278SP TTN → TTN Jul 3, 12:35 UTCJul 3, 13:20 UTC45m
2026-07-02 N278SP - Jul 2, 21:45 UTCJul 2, 23:50 UTC2h 5m
2026-07-02 N278SP LNS → TTN Jul 2, 02:45 UTCJul 2, 04:20 UTC1h 35m
2026-07-02 N278SP - Jul 2, 00:45 UTCJul 2, 01:35 UTC50m
2026-07-01 N278SP - Jul 1, 19:55 UTCJul 1, 21:40 UTC1h 45m
2026-07-01 N278SP - Jul 1, 16:45 UTCJul 1, 18:05 UTC1h 20m
2026-07-01 N278SP TTN → TTN Jul 1, 14:25 UTCJul 1, 15:30 UTC1h 5m
2026-07-01 N278SP - Jul 1, 11:50 UTCJul 1, 13:05 UTC1h 15m
2026-06-30 N278SP - Jun 30, 22:30 UTCJun 30, 23:55 UTC1h 25m
2026-06-30 N278SP TTN → TTN Jun 30, 18:50 UTCJun 30, 20:35 UTC1h 45m
2026-06-30 N278SP TTN → TTN Jun 30, 14:40 UTCJun 30, 15:40 UTC1h 0m
2026-06-30 N278SP TTN → TTN Jun 30, 12:45 UTCJun 30, 13:50 UTC1h 5m
2026-06-30 N278SP - Jun 30, 10:25 UTCJun 30, 11:55 UTC1h 30m
2026-06-29 N278SP - Jun 29, 19:54 UTCJun 29, 21:05 UTC1h 10m
2026-06-29 N278SP - Jun 29, 19:29 UTCJun 29, 19:49 UTC20m
2026-06-29 N278SP - Jun 29, 18:39 UTCJun 29, 19:20 UTC40m
2026-06-29 N278SP - Jun 29, 16:25 UTCJun 29, 17:10 UTC45m
2026-06-29 N278SP - Jun 29, 12:45 UTCJun 29, 13:39 UTC55m
2026-06-27 N278SP TTN → TTN Jun 27, 14:20 UTCJun 27, 15:45 UTC1h 25m
2026-06-26 N278SP - Jun 26, 23:39 UTCJun 27, 00:25 UTC45m
2026-06-26 N278SP - Jun 26, 21:55 UTCJun 26, 22:40 UTC45m
2026-06-26 N278SP - Jun 26, 20:04 UTCJun 26, 21:10 UTC1h 5m
2026-06-26 N278SP - Jun 26, 17:19 UTCJun 26, 18:29 UTC1h 10m
2026-06-26 N278SP - Jun 26, 15:15 UTCJun 26, 16:39 UTC1h 25m
2026-06-26 N278SP - Jun 26, 01:05 UTCJun 26, 04:14 UTC3h 10m
2026-06-25 N278SP TTN → TTN Jun 25, 18:59 UTCJun 25, 21:44 UTC2h 45m
2026-06-25 N278SP - Jun 25, 15:29 UTCJun 25, 16:09 UTC40m
2026-06-25 N278SP - Jun 25, 12:50 UTCJun 25, 13:50 UTC1h 0m
2026-06-24 N278SP TTN → TTN Jun 24, 21:29 UTCJun 24, 22:29 UTC1h 0m
2026-06-24 N278SP - Jun 24, 19:00 UTCJun 24, 20:20 UTC1h 20m
2026-06-24 N278SP - Jun 24, 16:29 UTCJun 24, 17:25 UTC55m
2026-06-24 N278SP - Jun 24, 11:29 UTCJun 24, 12:50 UTC1h 20m
2026-06-19 N278SP - Jun 19, 15:14 UTCJun 19, 17:04 UTC1h 50m
2026-06-19 N278SP - Jun 19, 10:35 UTCJun 19, 11:45 UTC1h 10m

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 N278SP page for operator, model, and routing details .

Mode-S A2C5D2 frequently asked

What is Mode-S code A2C5D2?
A2C5D2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N278SP.
Where is Mode-S A2C5D2 registered?
Mode-S code A2C5D2 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 A2C5D2 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 A2C5D2, octal 50542722, decimal 10,667,474.
What flights does A2C5D2 operate?
Mode-S A2C5D2 has broadcast 1 distinct callsign, including N278SP.