Apparatus

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sensors Mode-S transponder

A6A688

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N5279F · HUGHES 500 · operated by CITY OF HOUSTON

Hex
A6A688
Octal
51523210
Decimal
10,921,608
Country
US
Tail
N5279F
Type
H500
No current signal · last broadcast 15h ago
Flights observed
10
Distinct callsigns
1
Country
US
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S A6A688.

Country allocation

The ICAO 24-bit address A6A688 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
N5279F - 10 2026-04-14

Recent flights last 10

DateFlightRouteTakeoffLandingDuration
2026-04-14 N5279F - Apr 14, 07:10 UTCApr 14, 07:20 UTC10m
2026-04-14 N5279F - Apr 14, 06:05 UTCApr 14, 07:10 UTC1h 5m
2026-04-13 N5279F - Apr 13, 21:40 UTCApr 13, 22:55 UTC1h 15m
2026-04-13 N5279F - Apr 13, 16:15 UTCApr 13, 17:00 UTC45m
2026-04-13 N5279F - Apr 13, 15:50 UTCApr 13, 17:00 UTC1h 10m
2026-04-13 N5279F - Apr 13, 15:35 UTCApr 13, 16:15 UTC40m
2026-04-13 N5279F - Apr 13, 08:20 UTCApr 13, 09:30 UTC1h 10m
2026-04-13 N5279F - Apr 13, 04:20 UTCApr 13, 04:40 UTC20m
2026-04-13 N5279F - Apr 13, 03:55 UTCApr 13, 04:40 UTC45m
2026-04-13 N5279F - Apr 13, 03:25 UTCApr 13, 04:15 UTC50m

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 N5279F page for operator, model, and routing details .

Mode-S A6A688 frequently asked

What is Mode-S code A6A688?
A6A688 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N5279F.
Where is Mode-S A6A688 registered?
Mode-S code A6A688 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 A6A688 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6A688, octal 51523210, decimal 10,921,608.
What flights does A6A688 operate?
Mode-S A6A688 has broadcast 1 distinct callsign, including N5279F.