Apparatus

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sensors Mode-S transponder

A9FF4D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N743SP · CESSNA 172 Skyhawk · operated by SCOUT SPINAL DESIGNS LLC

Hex
A9FF4D
Octal
52377515
Decimal
11,140,941
Country
US
Tail
N743SP
Type
C172
Broadcasting now · callsign N743SP · 5,000 ft
Flights observed
177
Distinct callsigns
1
Country
US
Last broadcast
3h ago

Current position

A9FF4D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9FF4D 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
N743SP - 177 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-15 N743SP - Jun 15, 21:55 UTCJun 15, 22:30 UTC35m
2026-06-15 N743SP - Jun 15, 18:29 UTCJun 15, 18:45 UTC15m
2026-06-15 N743SP - Jun 15, 17:40 UTCJun 15, 17:54 UTC15m
2026-06-15 N743SP - Jun 15, 15:50 UTCJun 15, 16:55 UTC1h 5m
2026-06-15 N743SP - Jun 15, 14:30 UTCJun 15, 14:40 UTC10m
2026-06-14 N743SP - Jun 14, 23:25 UTCJun 15, 00:29 UTC1h 5m
2026-06-14 N743SP - Jun 14, 21:25 UTCJun 14, 22:40 UTC1h 15m
2026-06-14 N743SP - Jun 14, 20:25 UTCJun 14, 20:45 UTC20m
2026-06-14 N743SP - Jun 14, 18:35 UTCJun 14, 19:00 UTC25m
2026-06-14 N743SP - Jun 14, 16:40 UTCJun 14, 17:55 UTC1h 15m
2026-06-14 N743SP - Jun 14, 01:35 UTCJun 14, 02:25 UTC50m
2026-06-13 N743SP - Jun 13, 23:30 UTCJun 14, 00:45 UTC1h 15m
2026-06-13 N743SP - Jun 13, 19:45 UTCJun 13, 20:45 UTC1h 0m
2026-06-13 N743SP - Jun 13, 18:00 UTCJun 13, 18:45 UTC45m
2026-06-13 N743SP - Jun 13, 15:55 UTCJun 13, 16:50 UTC55m
2026-06-13 N743SP - Jun 13, 03:55 UTCJun 13, 04:50 UTC54m
2026-06-13 N743SP - Jun 13, 01:40 UTCJun 13, 02:35 UTC55m
2026-06-12 N743SP - Jun 12, 23:55 UTCJun 13, 00:50 UTC55m
2026-06-12 N743SP - Jun 12, 21:35 UTCJun 12, 22:30 UTC55m
2026-06-12 N743SP - Jun 12, 19:25 UTCJun 12, 20:35 UTC1h 10m
2026-06-12 N743SP - Jun 12, 17:40 UTCJun 12, 18:30 UTC50m
2026-06-12 N743SP - Jun 12, 15:40 UTCJun 12, 16:40 UTC1h 0m
2026-06-12 N743SP - Jun 12, 13:30 UTCJun 12, 14:35 UTC1h 5m
2026-06-12 N743SP - Jun 12, 01:30 UTCJun 12, 02:40 UTC1h 10m
2026-06-11 N743SP - Jun 11, 23:40 UTCJun 12, 00:20 UTC40m
2026-06-11 N743SP - Jun 11, 21:50 UTCJun 11, 22:55 UTC1h 5m
2026-06-11 N743SP - Jun 11, 19:55 UTCJun 11, 20:35 UTC40m
2026-06-11 N743SP - Jun 11, 17:35 UTCJun 11, 18:20 UTC45m
2026-06-11 N743SP - Jun 11, 15:20 UTCJun 11, 16:30 UTC1h 10m
2026-06-10 N743SP - Jun 10, 17:35 UTCJun 10, 18:40 UTC1h 5m
2026-06-10 N743SP - Jun 10, 15:55 UTCJun 10, 16:40 UTC45m
2026-06-10 N743SP - Jun 10, 13:40 UTCJun 10, 14:30 UTC50m
2026-06-10 N743SP - Jun 10, 05:10 UTCJun 10, 05:50 UTC40m
2026-06-10 N743SP - Jun 10, 04:15 UTCJun 10, 04:40 UTC25m
2026-06-10 N743SP - Jun 10, 01:25 UTCJun 10, 02:45 UTC1h 20m
2026-06-09 N743SP - Jun 9, 20:30 UTCJun 9, 22:20 UTC1h 50m
2026-06-09 N743SP - Jun 9, 17:40 UTCJun 9, 18:35 UTC55m
2026-06-09 N743SP - Jun 9, 15:35 UTCJun 9, 15:50 UTC15m
2026-06-09 N743SP - Jun 9, 14:05 UTCJun 9, 14:45 UTC40m
2026-06-08 N743SP - Jun 8, 19:40 UTCJun 8, 20:50 UTC1h 10m
2026-06-08 N743SP - Jun 8, 17:25 UTCJun 8, 18:45 UTC1h 20m
2026-06-08 N743SP - Jun 8, 14:30 UTCJun 8, 14:55 UTC25m
2026-06-07 N743SP - Jun 7, 00:49 UTCJun 7, 01:09 UTC20m
2026-06-06 N743SP - Jun 6, 18:29 UTCJun 6, 18:55 UTC25m
2026-06-06 N743SP - Jun 6, 15:39 UTCJun 6, 16:39 UTC1h 0m
2026-06-05 N743SP - Jun 5, 21:35 UTCJun 5, 22:45 UTC1h 10m
2026-06-05 N743SP - Jun 5, 18:25 UTCJun 5, 19:45 UTC1h 20m
2026-06-05 N743SP - Jun 5, 15:35 UTCJun 5, 16:35 UTC1h 0m
2026-06-04 N743SP - Jun 4, 19:35 UTCJun 4, 20:45 UTC1h 10m
2026-06-04 N743SP - Jun 4, 15:30 UTCJun 4, 17:10 UTC1h 40m

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 N743SP page for operator, model, and routing details .

Mode-S A9FF4D frequently asked

What is Mode-S code A9FF4D?
A9FF4D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N743SP.
Where is Mode-S A9FF4D registered?
Mode-S code A9FF4D 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 A9FF4D broadcasting right now?
Yes. Mode-S A9FF4D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9FF4D, octal 52377515, decimal 11,140,941.
What flights does A9FF4D operate?
Mode-S A9FF4D has broadcast 1 distinct callsign, including N743SP.