Apparatus

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sensors Mode-S transponder

A747D4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N5686H · ROBINSON R-66

Hex
A747D4
Octal
51643724
Decimal
10,962,900
Country
US
Tail
N5686H
Type
R66
No current signal · last broadcast Jul 12, 21:00 UTC
Flights observed
96
Distinct callsigns
2
Country
US
Last broadcast
Jul 12, 21:00 UTC

Last known position

Most recent position reported by Mode-S A747D4.

Country allocation

The ICAO 24-bit address A747D4 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 2 distinct

Callsign Airline Flights Last seen
N5686H - 58 2026-07-12
SGE66 - 38 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 N5686H - Jul 12, 20:20 UTCJul 12, 21:00 UTC40m
2026-07-12 N5686H - Jul 12, 02:50 UTCJul 12, 03:35 UTC45m
2026-07-12 N5686H - Jul 12, 01:40 UTCJul 12, 02:45 UTC1h 5m
2026-07-09 N5686H - Jul 9, 23:10 UTCJul 9, 23:30 UTC20m
2026-07-09 N5686H - Jul 9, 22:25 UTCJul 9, 23:05 UTC40m
2026-07-09 N5686H - Jul 9, 18:35 UTCJul 9, 18:55 UTC20m
2026-07-08 N5686H - Jul 8, 20:10 UTCJul 8, 20:40 UTC30m
2026-07-08 N5686H - Jul 8, 19:20 UTCJul 8, 19:30 UTC10m
2026-07-08 N5686H - Jul 8, 18:40 UTCJul 8, 19:00 UTC20m
2026-07-03 N5686H - Jul 3, 00:50 UTCJul 3, 01:30 UTC40m
2026-07-02 N5686H - Jul 2, 17:55 UTCJul 2, 18:50 UTC55m
2026-07-02 N5686H - Jul 2, 01:55 UTCJul 2, 02:25 UTC30m
2026-07-02 N5686H FRN → MRI Jul 2, 01:15 UTCJul 2, 01:50 UTC35m
2026-07-01 N5686H - Jul 1, 22:20 UTCJul 2, 01:10 UTC2h 50m
2026-07-01 N5686H - Jul 1, 21:55 UTCJul 1, 22:10 UTC15m
2026-07-01 N5686H - Jul 1, 20:55 UTCJul 1, 21:10 UTC15m
2026-07-01 N5686H - Jul 1, 18:10 UTCJul 1, 19:05 UTC55m
2026-07-01 N5686H - Jul 1, 00:20 UTCJul 1, 02:00 UTC1h 40m
2026-06-30 N5686H - Jun 30, 23:25 UTCJun 30, 23:45 UTC20m
2026-06-30 N5686H - Jun 30, 21:25 UTCJun 30, 21:40 UTC15m
2026-06-30 N5686H - Jun 30, 19:50 UTCJun 30, 20:35 UTC45m
2026-06-29 N5686H - Jun 29, 02:39 UTCJun 29, 03:10 UTC30m
2026-06-29 N5686H - Jun 29, 00:24 UTCJun 29, 00:49 UTC25m
2026-06-28 N5686H - Jun 28, 23:14 UTCJun 28, 23:50 UTC35m
2026-06-28 N5686H - Jun 28, 21:30 UTCJun 28, 21:40 UTC10m
2026-06-19 N5686H - Jun 19, 04:25 UTCJun 19, 04:34 UTC10m
2026-06-19 N5686H - Jun 19, 02:24 UTCJun 19, 02:54 UTC30m
2026-06-18 N5686H - Jun 18, 21:25 UTCJun 18, 22:20 UTC55m
2026-06-18 N5686H - Jun 18, 00:05 UTCJun 18, 00:15 UTC10m
2026-06-17 N5686H - Jun 17, 01:25 UTCJun 17, 01:45 UTC20m
2026-06-17 N5686H - Jun 17, 00:25 UTCJun 17, 01:05 UTC40m
2026-06-16 N5686H - Jun 16, 23:45 UTCJun 17, 00:00 UTC15m
2026-06-16 N5686H - Jun 16, 21:35 UTCJun 16, 21:45 UTC10m
2026-06-16 N5686H - Jun 16, 19:35 UTCJun 16, 20:20 UTC46m
2026-06-16 N5686H - Jun 16, 19:00 UTCJun 16, 19:10 UTC10m
2026-06-16 N5686H - Jun 16, 18:25 UTCJun 16, 18:45 UTC20m
2026-06-16 N5686H - Jun 16, 00:24 UTCJun 16, 00:45 UTC20m
2026-06-15 N5686H - Jun 15, 23:19 UTCJun 16, 00:10 UTC50m
2026-06-15 N5686H - Jun 15, 19:05 UTCJun 15, 19:25 UTC20m
2026-06-15 N5686H - Jun 15, 18:25 UTCJun 15, 18:40 UTC15m
2026-06-15 N5686H - Jun 15, 16:19 UTCJun 15, 16:59 UTC40m
2026-06-15 N5686H - Jun 15, 15:15 UTCJun 15, 15:35 UTC20m
2026-06-15 N5686H - Jun 15, 01:25 UTCJun 15, 02:30 UTC1h 5m
2026-06-14 N5686H - Jun 14, 18:20 UTCJun 14, 19:25 UTC1h 5m
2026-06-14 N5686H - Jun 14, 01:05 UTCJun 14, 02:15 UTC1h 10m
2026-06-13 N5686H - Jun 13, 19:25 UTCJun 13, 20:10 UTC45m
2026-06-13 N5686H - Jun 13, 17:15 UTCJun 13, 18:10 UTC55m
2026-06-13 N5686H - Jun 13, 01:35 UTCJun 13, 03:15 UTC1h 40m
2026-06-13 N5686H - Jun 13, 00:50 UTCJun 13, 01:25 UTC35m
2026-06-02 N5686H - Jun 2, 20:05 UTCJun 2, 22:25 UTC2h 20m

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 N5686H page for operator, model, and routing details .

Mode-S A747D4 frequently asked

What is Mode-S code A747D4?
A747D4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N5686H.
Where is Mode-S A747D4 registered?
Mode-S code A747D4 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 A747D4 broadcasting right now?
No active broadcast right now. Last signal was Jul 12, 21:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A747D4, octal 51643724, decimal 10,962,900.
What flights does A747D4 operate?
Mode-S A747D4 has broadcast 2 distinct callsigns, including N5686H, SGE66.