Apparatus

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sensors Mode-S transponder

A4B964

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N403SP · CESSNA 172 Skyhawk · operated by HILLSBORO AERO ACADEMY LLC

Hex
A4B964
Octal
51134544
Decimal
10,795,364
Country
US
Tail
N403SP
Type
C172
No current signal · last broadcast 19m ago
Flights observed
237
Distinct callsigns
1
Country
US
Last broadcast
19m ago

Last known position

Most recent position reported by Mode-S A4B964.

Country allocation

The ICAO 24-bit address A4B964 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
N403SP - 237 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 N403SP RDM → RDM Jul 15, 00:30 UTCJul 15, 00:50 UTC20m
2026-07-14 N403SP - Jul 14, 19:25 UTCJul 14, 20:45 UTC1h 20m
2026-07-14 N403SP RDM → RDM Jul 14, 17:45 UTCJul 14, 18:35 UTC50m
2026-07-14 N403SP - Jul 14, 15:25 UTCJul 14, 16:45 UTC1h 20m
2026-07-14 N403SP - Jul 14, 01:20 UTCJul 14, 01:55 UTC35m
2026-07-13 N403SP - Jul 13, 18:30 UTCJul 13, 19:30 UTC1h 0m
2026-07-13 N403SP - Jul 13, 15:35 UTCJul 13, 17:15 UTC1h 40m
2026-07-11 N403SP - Jul 11, 18:25 UTCJul 11, 19:25 UTC1h 0m
2026-07-11 N403SP RDM → RDM Jul 11, 15:00 UTCJul 11, 16:30 UTC1h 30m
2026-07-10 N403SP - Jul 10, 22:55 UTCJul 11, 00:40 UTC1h 45m
2026-07-10 N403SP - Jul 10, 18:15 UTCJul 10, 19:45 UTC1h 30m
2026-07-10 N403SP RDM → RDM Jul 10, 13:40 UTCJul 10, 15:00 UTC1h 20m
2026-07-10 N403SP - Jul 10, 01:30 UTCJul 10, 02:55 UTC1h 25m
2026-07-09 N403SP - Jul 9, 23:00 UTCJul 9, 23:45 UTC45m
2026-07-09 N403SP ONP → RDM Jul 9, 17:00 UTCJul 9, 19:00 UTC2h 0m
2026-07-09 N403SP - Jul 9, 14:00 UTCJul 9, 15:25 UTC1h 25m
2026-07-08 N403SP - Jul 8, 22:55 UTCJul 9, 00:15 UTC1h 20m
2026-07-08 N403SP - Jul 8, 19:45 UTCJul 8, 20:40 UTC55m
2026-07-08 N403SP - Jul 8, 17:25 UTCJul 8, 18:30 UTC1h 5m
2026-07-08 N403SP - Jul 8, 14:05 UTCJul 8, 15:20 UTC1h 15m
2026-07-07 N403SP - Jul 7, 18:20 UTCJul 7, 19:15 UTC55m
2026-07-07 N403SP - Jul 7, 15:15 UTCJul 7, 16:45 UTC1h 30m
2026-07-05 N403SP RDM → RDM Jul 5, 19:40 UTCJul 5, 20:50 UTC1h 10m
2026-07-04 N403SP - Jul 4, 18:40 UTCJul 4, 19:50 UTC1h 10m
2026-07-04 N403SP - Jul 4, 15:00 UTCJul 4, 16:05 UTC1h 5m
2026-07-04 N403SP - Jul 4, 00:25 UTCJul 4, 01:30 UTC1h 5m
2026-07-03 N403SP - Jul 3, 17:45 UTCJul 3, 19:45 UTC2h 0m
2026-07-03 N403SP RDM → RDM Jul 3, 14:00 UTCJul 3, 15:25 UTC1h 25m
2026-07-01 N403SP RDM → RDM Jul 1, 18:55 UTCJul 1, 20:15 UTC1h 20m
2026-07-01 N403SP RDM → RDM Jul 1, 17:25 UTCJul 1, 17:55 UTC30m
2026-06-30 N403SP - Jun 30, 18:35 UTCJun 30, 20:10 UTC1h 35m
2026-06-30 N403SP RDM → RDM Jun 30, 15:35 UTCJun 30, 16:30 UTC55m
2026-06-29 N403SP RDM → RDM Jun 29, 20:19 UTCJun 29, 21:39 UTC1h 20m
2026-06-29 N403SP - Jun 29, 17:30 UTCJun 29, 18:30 UTC1h 0m
2026-06-29 N403SP RDM → RDM Jun 29, 12:45 UTCJun 29, 14:04 UTC1h 20m
2026-06-29 N403SP - Jun 29, 02:35 UTCJun 29, 03:39 UTC1h 5m
2026-06-28 N403SP RDM → RDM Jun 28, 19:14 UTCJun 28, 20:29 UTC1h 15m
2026-06-25 N403SP RDM → RDM Jun 25, 17:20 UTCJun 25, 18:24 UTC1h 5m
2026-06-24 N403SP RDM → RDM Jun 24, 20:54 UTCJun 24, 22:04 UTC1h 10m
2026-06-24 N403SP - Jun 24, 18:39 UTCJun 24, 19:44 UTC1h 5m
2026-06-24 N403SP - Jun 24, 13:24 UTCJun 24, 14:45 UTC1h 20m
2026-06-24 N403SP - Jun 24, 04:24 UTCJun 24, 05:24 UTC1h 0m
2026-06-23 N403SP - Jun 23, 16:35 UTCJun 23, 17:39 UTC1h 5m
2026-06-23 N403SP - Jun 23, 14:29 UTCJun 23, 15:30 UTC1h 0m
2026-06-22 N403SP - Jun 22, 21:54 UTCJun 22, 22:19 UTC25m
2026-06-22 N403SP - Jun 22, 20:34 UTCJun 22, 21:19 UTC45m
2026-06-21 N403SP PRZ → RDM Jun 21, 19:45 UTCJun 21, 21:05 UTC1h 20m
2026-06-20 N403SP - Jun 20, 23:10 UTCJun 20, 23:50 UTC40m
2026-06-20 N403SP - Jun 20, 20:55 UTCJun 20, 22:10 UTC1h 15m
2026-06-20 N403SP - Jun 20, 16:00 UTCJun 20, 17:04 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 N403SP page for operator, model, and routing details .

Mode-S A4B964 frequently asked

What is Mode-S code A4B964?
A4B964 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N403SP.
Where is Mode-S A4B964 registered?
Mode-S code A4B964 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 A4B964 broadcasting right now?
No active broadcast right now. Last signal was 19m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4B964, octal 51134544, decimal 10,795,364.
What flights does A4B964 operate?
Mode-S A4B964 has broadcast 1 distinct callsign, including N403SP.