Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A651D8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N506SP · operated by HENRIE AVIATION LLC

Hex
A651D8
Octal
51450730
Decimal
10,899,928
Country
US
Tail
N506SP
Type
C172
No current signal · last broadcast 7h ago
Flights observed
141
Distinct callsigns
1
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A651D8.

Country allocation

The ICAO 24-bit address A651D8 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
N506SP - 141 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 N506SP - Jul 21, 01:45 UTCJul 21, 05:25 UTC3h 40m
2026-07-20 N506SP - Jul 20, 19:25 UTCJul 20, 20:00 UTC35m
2026-07-20 N506SP - Jul 20, 18:30 UTCJul 20, 18:55 UTC25m
2026-07-20 N506SP - Jul 20, 16:15 UTCJul 20, 17:05 UTC50m
2026-07-16 N506SP CDW → CDW Jul 16, 16:49 UTCJul 16, 17:05 UTC15m
2026-07-15 N506SP - Jul 15, 12:50 UTCJul 15, 13:30 UTC40m
2026-07-14 N506SP HVN → CDW Jul 14, 23:40 UTCJul 15, 00:30 UTC50m
2026-07-14 N506SP - Jul 14, 20:40 UTCJul 14, 21:10 UTC30m
2026-07-14 N506SP - Jul 14, 14:10 UTCJul 14, 14:50 UTC40m
2026-07-13 N506SP - Jul 13, 23:20 UTCJul 13, 23:55 UTC35m
2026-07-13 N506SP - Jul 13, 20:40 UTCJul 13, 21:20 UTC40m
2026-07-13 N506SP - Jul 13, 14:45 UTCJul 13, 15:50 UTC1h 5m
2026-07-12 N506SP - Jul 12, 13:40 UTCJul 12, 15:50 UTC2h 10m
2026-07-11 N506SP - Jul 11, 18:30 UTCJul 11, 18:55 UTC25m
2026-07-11 N506SP - Jul 11, 17:30 UTCJul 11, 18:00 UTC30m
2026-07-11 N506SP - Jul 11, 14:10 UTCJul 11, 14:55 UTC45m
2026-07-09 N506SP - Jul 9, 14:55 UTCJul 9, 16:00 UTC1h 5m
2026-07-08 N506SP - Jul 8, 17:50 UTCJul 8, 18:50 UTC1h 0m
2026-07-02 N506SP - Jul 2, 21:45 UTCJul 3, 00:00 UTC2h 15m
2026-07-02 N506SP - Jul 2, 11:45 UTCJul 2, 12:40 UTC55m
2026-07-01 N506SP - Jul 1, 16:10 UTCJul 1, 17:25 UTC1h 15m
2026-06-30 N506SP - Jun 30, 23:20 UTCJul 1, 00:05 UTC45m
2026-06-30 N506SP - Jun 30, 20:30 UTCJun 30, 21:05 UTC35m
2026-06-30 N506SP - Jun 30, 17:55 UTCJun 30, 18:15 UTC20m
2026-06-30 N506SP - Jun 30, 16:40 UTCJun 30, 17:00 UTC20m
2026-06-30 N506SP - Jun 30, 12:50 UTCJun 30, 13:50 UTC1h 0m
2026-06-29 N506SP - Jun 29, 16:59 UTCJun 29, 17:49 UTC50m
2026-06-29 N506SP - Jun 29, 14:44 UTCJun 29, 15:04 UTC20m
2026-06-28 N506SP CDW → CDW Jun 28, 17:04 UTCJun 28, 17:30 UTC25m
2026-06-26 N506SP - Jun 26, 18:29 UTCJun 26, 19:39 UTC1h 10m
2026-06-25 N506SP - Jun 25, 16:55 UTCJun 25, 17:54 UTC1h 0m
2026-06-25 N506SP CDW → CDW Jun 25, 14:55 UTCJun 25, 15:50 UTC55m
2026-06-25 N506SP - Jun 25, 12:50 UTCJun 25, 13:55 UTC1h 5m
2026-06-25 N506SP CDW → CDW Jun 25, 00:24 UTCJun 25, 02:39 UTC2h 15m
2026-06-24 N506SP - Jun 24, 19:49 UTCJun 24, 21:34 UTC1h 45m
2026-06-24 N506SP - Jun 24, 18:05 UTCJun 24, 18:55 UTC50m
2026-06-24 N506SP - Jun 24, 13:44 UTCJun 24, 14:55 UTC1h 10m
2026-06-24 N506SP - Jun 24, 00:49 UTCJun 24, 02:24 UTC1h 35m
2026-06-21 N506SP - Jun 21, 19:29 UTCJun 21, 19:55 UTC25m
2026-06-21 N506SP - Jun 21, 17:50 UTCJun 21, 18:54 UTC1h 5m
2026-06-21 N506SP - Jun 21, 14:50 UTCJun 21, 16:04 UTC1h 15m
2026-06-21 N506SP - Jun 21, 12:44 UTCJun 21, 13:44 UTC1h 0m
2026-06-20 N506SP - Jun 20, 21:05 UTCJun 20, 21:19 UTC15m
2026-06-20 N506SP - Jun 20, 19:29 UTCJun 20, 20:20 UTC50m
2026-06-20 N506SP CDW → CDW Jun 20, 13:49 UTCJun 20, 14:19 UTC30m
2026-06-19 N506SP - Jun 19, 16:39 UTCJun 19, 17:49 UTC1h 10m
2026-06-17 N506SP - Jun 17, 18:05 UTCJun 17, 20:40 UTC2h 35m
2026-06-17 N506SP - Jun 17, 12:45 UTCJun 17, 15:05 UTC2h 20m
2026-06-16 N506SP - Jun 16, 22:55 UTCJun 17, 00:00 UTC1h 5m
2026-06-16 N506SP - Jun 16, 19:35 UTCJun 16, 21:35 UTC2h 1m

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 N506SP page for operator, model, and routing details .

Mode-S A651D8 frequently asked

What is Mode-S code A651D8?
A651D8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N506SP.
Where is Mode-S A651D8 registered?
Mode-S code A651D8 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 A651D8 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A651D8, octal 51450730, decimal 10,899,928.
What flights does A651D8 operate?
Mode-S A651D8 has broadcast 1 distinct callsign, including N506SP.