Apparatus

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sensors Mode-S transponder

A9D879

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N733ZK · CESSNA 172 Skyhawk · operated by STONE AVIATION LLC

Hex
A9D879
Octal
52354171
Decimal
11,131,001
Country
US
Tail
N733ZK
Type
C172
No current signal · last broadcast 11h ago
Flights observed
180
Distinct callsigns
1
Country
US
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S A9D879.

Country allocation

The ICAO 24-bit address A9D879 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
N733ZK - 180 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N733ZK - Jul 13, 22:05 UTCJul 13, 23:30 UTC1h 25m
2026-07-13 N733ZK - Jul 13, 19:15 UTCJul 13, 20:25 UTC1h 10m
2026-07-13 N733ZK OAK → OAK Jul 13, 01:55 UTCJul 13, 02:05 UTC10m
2026-07-13 N733ZK OAK → OAK Jul 13, 01:40 UTCJul 13, 01:50 UTC10m
2026-07-12 N733ZK OAK → OAK Jul 12, 23:20 UTCJul 13, 00:50 UTC1h 30m
2026-07-12 N733ZK - Jul 12, 20:15 UTCJul 12, 20:30 UTC15m
2026-07-12 N733ZK - Jul 12, 18:10 UTCJul 12, 18:30 UTC20m
2026-07-12 N733ZK OAK → OAK Jul 12, 15:55 UTCJul 12, 16:35 UTC40m
2026-07-12 N733ZK OAK → OAK Jul 12, 01:55 UTCJul 12, 02:45 UTC50m
2026-07-11 N733ZK - Jul 11, 23:05 UTCJul 12, 00:20 UTC1h 15m
2026-07-11 N733ZK OAK → OAK Jul 11, 22:20 UTCJul 11, 22:35 UTC15m
2026-07-11 N733ZK - Jul 11, 19:15 UTCJul 11, 19:55 UTC40m
2026-07-11 N733ZK - Jul 11, 04:25 UTCJul 11, 06:50 UTC2h 25m
2026-07-11 N733ZK OAK → OAK Jul 11, 01:00 UTCJul 11, 01:50 UTC50m
2026-07-10 N733ZK OAK → OAK Jul 10, 21:50 UTCJul 10, 22:50 UTC1h 0m
2026-07-10 N733ZK SAC → OAK Jul 10, 02:55 UTCJul 10, 03:50 UTC55m
2026-07-10 N733ZK - Jul 10, 01:10 UTCJul 10, 02:05 UTC55m
2026-07-09 N733ZK - Jul 9, 21:15 UTCJul 9, 23:30 UTC2h 15m
2026-07-09 N733ZK - Jul 9, 03:25 UTCJul 9, 04:15 UTC50m
2026-07-09 N733ZK - Jul 9, 01:40 UTCJul 9, 02:25 UTC45m
2026-07-08 N733ZK - Jul 8, 23:05 UTCJul 8, 23:15 UTC10m
2026-07-08 N733ZK OAK → CCR Jul 8, 22:05 UTCJul 8, 23:00 UTC55m
2026-06-22 N733ZK OAK → HWD Jun 22, 04:24 UTCJun 22, 05:04 UTC40m
2026-06-22 N733ZK OAK → OAK Jun 22, 02:34 UTCJun 22, 03:30 UTC55m
2026-06-22 N733ZK OAK → OAK Jun 22, 02:00 UTCJun 22, 02:30 UTC30m
2026-06-21 N733ZK - Jun 21, 23:05 UTCJun 21, 23:59 UTC55m
2026-06-21 N733ZK OAK → OAK Jun 21, 20:45 UTCJun 21, 21:49 UTC1h 5m
2026-06-20 N733ZK OAK → OAK Jun 20, 23:25 UTCJun 21, 00:49 UTC1h 25m
2026-06-20 N733ZK - Jun 20, 20:34 UTCJun 20, 22:25 UTC1h 50m
2026-06-20 N733ZK OAK → OAK Jun 20, 04:24 UTCJun 20, 05:09 UTC45m
2026-06-20 N733ZK OAK → OAK Jun 20, 01:09 UTCJun 20, 02:09 UTC1h 0m
2026-06-19 N733ZK OAK → OAK Jun 19, 20:24 UTCJun 19, 21:24 UTC1h 0m
2026-06-19 N733ZK OAK → OAK Jun 19, 17:29 UTCJun 19, 18:09 UTC40m
2026-06-19 N733ZK OAK → OAK Jun 19, 14:44 UTCJun 19, 15:29 UTC45m
2026-06-19 N733ZK OAK → OAK Jun 19, 01:59 UTCJun 19, 02:59 UTC1h 0m
2026-06-19 N733ZK OAK → OAK Jun 19, 01:24 UTCJun 19, 01:39 UTC15m
2026-06-18 N733ZK - Jun 18, 20:25 UTCJun 18, 22:05 UTC1h 40m
2026-06-18 N733ZK - Jun 18, 18:00 UTCJun 18, 19:50 UTC1h 50m
2026-06-18 N733ZK OAK → OAK Jun 18, 15:40 UTCJun 18, 16:35 UTC55m
2026-06-18 N733ZK OAK → OAK Jun 18, 01:30 UTCJun 18, 02:55 UTC1h 25m
2026-06-17 N733ZK - Jun 17, 21:30 UTCJun 17, 23:05 UTC1h 35m
2026-06-16 N733ZK - Jun 16, 20:10 UTCJun 16, 21:30 UTC1h 20m
2026-06-16 N733ZK - Jun 16, 18:15 UTCJun 16, 19:30 UTC1h 15m
2026-06-15 N733ZK - Jun 15, 23:50 UTCJun 16, 00:40 UTC50m
2026-06-15 N733ZK - Jun 15, 22:00 UTCJun 15, 23:09 UTC1h 10m
2026-06-15 N733ZK - Jun 15, 01:40 UTCJun 15, 03:24 UTC1h 45m
2026-06-14 N733ZK OAK → OAK Jun 14, 23:20 UTCJun 15, 01:00 UTC1h 40m
2026-06-14 N733ZK OAK → OAK Jun 14, 21:30 UTCJun 14, 22:00 UTC30m
2026-06-14 N733ZK OAK → OAK Jun 14, 19:20 UTCJun 14, 20:05 UTC45m
2026-06-14 N733ZK OAK → OAK Jun 14, 17:30 UTCJun 14, 18:10 UTC40m

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 N733ZK page for operator, model, and routing details .

Mode-S A9D879 frequently asked

What is Mode-S code A9D879?
A9D879 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N733ZK.
Where is Mode-S A9D879 registered?
Mode-S code A9D879 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 A9D879 broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9D879, octal 52354171, decimal 11,131,001.
What flights does A9D879 operate?
Mode-S A9D879 has broadcast 1 distinct callsign, including N733ZK.