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sensors Mode-S transponder

AC15B0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N878ST · CESSNA 208 Caravan · operated by PENNSYLVANIA STATE POLICE

Hex
AC15B0
Octal
53012660
Decimal
11,277,744
Country
US
Tail
N878ST
Type
C208
No current signal · last broadcast 2d ago
Flights observed
87
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S AC15B0.

Country allocation

The ICAO 24-bit address AC15B0 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
N878ST - 87 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 N878ST - Jul 15, 14:50 UTCJul 15, 15:10 UTC20m
2026-07-15 N878ST - Jul 15, 14:25 UTCJul 15, 14:45 UTC20m
2026-07-15 N878ST - Jul 15, 13:40 UTCJul 15, 13:50 UTC10m
2026-07-14 N878ST - Jul 14, 14:20 UTCJul 14, 14:25 UTC5m
2026-07-14 N878ST - Jul 14, 13:40 UTCJul 14, 14:10 UTC30m
2026-07-14 N878ST - Jul 14, 12:45 UTCJul 14, 13:00 UTC15m
2026-07-08 N878ST - Jul 8, 19:05 UTCJul 8, 20:00 UTC55m
2026-07-08 N878ST - Jul 8, 17:10 UTCJul 8, 18:15 UTC1h 5m
2026-07-08 N878ST - Jul 8, 11:35 UTCJul 8, 14:00 UTC2h 25m
2026-07-05 N878ST - Jul 5, 03:35 UTCJul 5, 04:15 UTC40m
2026-07-04 N878ST - Jul 4, 23:15 UTCJul 5, 00:05 UTC50m
2026-07-04 N878ST - Jul 4, 18:50 UTCJul 4, 20:15 UTC1h 25m
2026-07-01 N878ST - Jul 1, 17:50 UTCJul 1, 18:30 UTC40m
2026-07-01 N878ST - Jul 1, 16:40 UTCJul 1, 17:00 UTC20m
2026-07-01 N878ST - Jul 1, 15:10 UTCJul 1, 16:10 UTC1h 0m
2026-07-01 N878ST - Jul 1, 14:05 UTCJul 1, 14:35 UTC30m
2026-06-30 N878ST - Jun 30, 21:45 UTCJun 30, 22:55 UTC1h 10m
2026-06-30 N878ST - Jun 30, 21:00 UTCJun 30, 21:10 UTC10m
2026-06-29 N878ST - Jun 29, 20:44 UTCJun 29, 22:19 UTC1h 35m
2026-06-27 N878ST - Jun 27, 23:29 UTCJun 28, 00:15 UTC45m
2026-06-27 N878ST - Jun 27, 19:15 UTCJun 27, 19:49 UTC35m
2026-06-26 N878ST - Jun 26, 17:04 UTCJun 26, 17:44 UTC40m
2026-06-26 N878ST - Jun 26, 14:05 UTCJun 26, 15:05 UTC1h 0m
2026-06-25 N878ST - Jun 25, 22:20 UTCJun 25, 23:55 UTC1h 35m
2026-06-25 N878ST - Jun 25, 18:00 UTCJun 25, 19:44 UTC1h 45m
2026-06-23 N878ST - Jun 23, 23:24 UTCJun 24, 00:20 UTC55m
2026-06-23 N878ST - Jun 23, 22:55 UTCJun 23, 23:19 UTC25m
2026-06-23 N878ST - Jun 23, 03:45 UTCJun 23, 04:09 UTC25m
2026-06-23 N878ST - Jun 23, 01:15 UTCJun 23, 03:04 UTC1h 50m
2026-06-22 N878ST - Jun 22, 18:00 UTCJun 22, 19:24 UTC1h 25m
2026-06-20 N878ST - Jun 20, 02:40 UTCJun 20, 04:59 UTC2h 20m
2026-06-19 N878ST - Jun 19, 21:19 UTCJun 19, 22:24 UTC1h 5m
2026-06-17 N878ST - Jun 17, 16:50 UTCJun 17, 17:50 UTC1h 0m
2026-06-17 N878ST - Jun 17, 13:50 UTCJun 17, 16:05 UTC2h 15m
2026-06-15 N878ST - Jun 15, 15:45 UTCJun 15, 18:15 UTC2h 30m
2026-06-15 N878ST - Jun 15, 14:05 UTCJun 15, 15:00 UTC55m
2026-06-15 N878ST - Jun 15, 00:29 UTCJun 15, 01:04 UTC35m
2026-06-14 N878ST - Jun 14, 20:00 UTCJun 14, 21:20 UTC1h 20m
2026-06-12 N878ST - Jun 12, 14:40 UTCJun 12, 15:55 UTC1h 15m
2026-06-12 N878ST - Jun 12, 13:05 UTCJun 12, 14:10 UTC1h 5m
2026-06-11 N878ST - Jun 11, 18:35 UTCJun 11, 18:55 UTC20m
2026-06-11 N878ST HAR → RDG Jun 11, 14:50 UTCJun 11, 16:55 UTC2h 5m
2026-06-04 N878ST - Jun 4, 16:05 UTCJun 4, 16:35 UTC30m
2026-06-04 N878ST - Jun 4, 14:55 UTCJun 4, 15:25 UTC30m
2026-06-03 N878ST - Jun 3, 13:30 UTCJun 3, 14:05 UTC35m
2026-06-03 N878ST - Jun 3, 11:45 UTCJun 3, 12:25 UTC40m
2026-06-02 N878ST - Jun 2, 16:15 UTCJun 2, 17:00 UTC45m
2026-06-02 N878ST - Jun 2, 13:10 UTCJun 2, 13:45 UTC35m
2026-06-01 N878ST - Jun 1, 23:05 UTCJun 1, 23:15 UTC10m
2026-06-01 N878ST - Jun 1, 22:20 UTCJun 1, 22:30 UTC10m

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 N878ST page for operator, model, and routing details .

Mode-S AC15B0 frequently asked

What is Mode-S code AC15B0?
AC15B0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N878ST.
Where is Mode-S AC15B0 registered?
Mode-S code AC15B0 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 AC15B0 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC15B0, octal 53012660, decimal 11,277,744.
What flights does AC15B0 operate?
Mode-S AC15B0 has broadcast 1 distinct callsign, including N878ST.