Apparatus

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sensors Mode-S transponder

A6A681

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N52789 · CESSNA 172 Skyhawk · operated by ALAMEDA AERO CLUB

Hex
A6A681
Octal
51523201
Decimal
10,921,601
Country
US
Tail
N52789
Type
C172
No current signal · last broadcast 5d ago
Flights observed
184
Distinct callsigns
1
Country
US
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S A6A681.

Country allocation

The ICAO 24-bit address A6A681 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
N52789 - 184 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-08 N52789 - Jul 8, 20:30 UTCJul 8, 20:45 UTC15m
2026-07-05 N52789 OAK → OAK Jul 5, 22:10 UTCJul 5, 23:40 UTC1h 30m
2026-07-05 N52789 OAK → OAK Jul 5, 02:05 UTCJul 5, 02:40 UTC35m
2026-07-03 N52789 - Jul 3, 03:10 UTCJul 3, 03:50 UTC40m
2026-07-03 N52789 - Jul 3, 01:10 UTCJul 3, 02:25 UTC1h 15m
2026-07-02 N52789 - Jul 2, 19:50 UTCJul 2, 20:05 UTC15m
2026-07-02 N52789 OAK → LVK Jul 2, 18:20 UTCJul 2, 18:55 UTC35m
2026-07-02 N52789 LVK → OAK Jul 2, 03:45 UTCJul 2, 04:05 UTC20m
2026-07-02 N52789 OAK → LVK Jul 2, 01:55 UTCJul 2, 02:55 UTC1h 0m
2026-07-01 N52789 OAK → OAK Jul 1, 20:25 UTCJul 1, 20:45 UTC20m
2026-07-01 N52789 OAK → OAK Jul 1, 19:05 UTCJul 1, 19:15 UTC10m
2026-06-30 N52789 OAK → OAK Jun 30, 02:50 UTCJun 30, 04:25 UTC1h 35m
2026-06-26 N52789 - Jun 26, 03:54 UTCJun 26, 04:39 UTC45m
2026-06-26 N52789 - Jun 26, 02:24 UTCJun 26, 03:05 UTC40m
2026-06-24 N52789 OAK → OAK Jun 24, 16:09 UTCJun 24, 17:29 UTC1h 20m
2026-06-23 N52789 OAK → OAK Jun 23, 22:15 UTCJun 24, 00:15 UTC2h 0m
2026-06-23 N52789 OAK → OAK Jun 23, 15:40 UTCJun 23, 17:50 UTC2h 10m
2026-06-23 N52789 - Jun 23, 02:55 UTCJun 23, 03:25 UTC30m
2026-06-23 N52789 - Jun 23, 01:30 UTCJun 23, 02:09 UTC40m
2026-06-21 N52789 - Jun 21, 23:40 UTCJun 22, 00:50 UTC1h 10m
2026-06-21 N52789 - Jun 21, 20:14 UTCJun 21, 21:54 UTC1h 40m
2026-06-19 N52789 OAK → OAK Jun 19, 19:04 UTCJun 19, 19:45 UTC40m
2026-06-19 N52789 OAK → OAK Jun 19, 00:29 UTCJun 19, 03:24 UTC2h 55m
2026-06-18 N52789 OAK → OAK Jun 18, 18:35 UTCJun 18, 20:25 UTC1h 50m
2026-06-18 N52789 OAK → OAK Jun 18, 16:45 UTCJun 18, 17:45 UTC1h 0m
2026-06-18 N52789 - Jun 18, 03:35 UTCJun 18, 04:20 UTC45m
2026-06-18 N52789 - Jun 18, 01:50 UTCJun 18, 02:45 UTC55m
2026-06-17 N52789 - Jun 17, 03:40 UTCJun 17, 05:00 UTC1h 20m
2026-06-17 N52789 - Jun 17, 01:20 UTCJun 17, 02:25 UTC1h 5m
2026-06-16 N52789 - Jun 16, 23:50 UTCJun 17, 00:05 UTC15m
2026-06-16 N52789 OAK → LVK Jun 16, 22:40 UTCJun 16, 23:15 UTC35m
2026-06-16 N52789 - Jun 16, 18:25 UTCJun 16, 19:50 UTC1h 26m
2026-06-16 N52789 OAK → OAK Jun 16, 16:00 UTCJun 16, 17:55 UTC1h 55m
2026-06-15 N52789 - Jun 15, 19:20 UTCJun 15, 19:30 UTC10m
2026-06-15 N52789 OAK → LVK Jun 15, 17:59 UTCJun 15, 18:40 UTC40m
2026-06-15 N52789 CCR → OAK Jun 15, 00:15 UTCJun 15, 02:15 UTC2h 0m
2026-06-14 N52789 OAK → CCR Jun 14, 23:59 UTCJun 15, 00:10 UTC10m
2026-06-14 N52789 OAK → OAK Jun 14, 18:05 UTCJun 14, 21:10 UTC3h 5m
2026-06-14 N52789 OAK → OAK Jun 14, 02:05 UTCJun 14, 03:30 UTC1h 25m
2026-06-13 N52789 - Jun 13, 23:30 UTCJun 14, 00:25 UTC55m
2026-06-13 N52789 - Jun 13, 20:20 UTCJun 13, 21:50 UTC1h 30m
2026-06-13 N52789 - Jun 13, 04:30 UTCJun 13, 05:05 UTC35m
2026-06-13 N52789 OAK → STS Jun 13, 01:30 UTCJun 13, 02:05 UTC35m
2026-06-12 N52789 LVK → OAK Jun 12, 17:25 UTCJun 12, 18:45 UTC1h 20m
2026-06-12 N52789 OAK → LVK Jun 12, 16:10 UTCJun 12, 16:50 UTC40m
2026-06-11 N52789 - Jun 11, 21:40 UTCJun 11, 21:55 UTC15m
2026-06-11 N52789 - Jun 11, 19:25 UTCJun 11, 20:55 UTC1h 30m
2026-06-11 N52789 - Jun 11, 15:10 UTCJun 11, 15:20 UTC10m
2026-06-11 N52789 - Jun 11, 03:10 UTCJun 11, 03:45 UTC35m
2026-06-11 N52789 - Jun 11, 01:05 UTCJun 11, 02:30 UTC1h 25m

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 N52789 page for operator, model, and routing details .

Mode-S A6A681 frequently asked

What is Mode-S code A6A681?
A6A681 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N52789.
Where is Mode-S A6A681 registered?
Mode-S code A6A681 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 A6A681 broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6A681, octal 51523201, decimal 10,921,601.
What flights does A6A681 operate?
Mode-S A6A681 has broadcast 1 distinct callsign, including N52789.