Apparatus

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sensors Mode-S transponder

A8A2A2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N6557H · CESSNA 172 Skyhawk · operated by RIVERSIDE FLIGHT ACADEMY LLC

Hex
A8A2A2
Octal
52121242
Decimal
11,051,682
Country
US
Tail
N6557H
Type
C172
Transponder active on ground
Flights observed
261
Distinct callsigns
1
Country
US
Last broadcast
16m ago

Last known position

Most recent position reported by Mode-S A8A2A2.

Country allocation

The ICAO 24-bit address A8A2A2 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
N6557H - 261 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N6557H - Jul 14, 15:55 UTCJul 14, 16:30 UTC35m
2026-07-13 N6557H WHP → RAL Jul 13, 15:55 UTCJul 13, 16:40 UTC45m
2026-07-13 N6557H RAL → WHP Jul 13, 13:30 UTCJul 13, 14:10 UTC40m
2026-07-12 N6557H RAL → RAL Jul 12, 18:20 UTCJul 12, 20:40 UTC2h 20m
2026-07-12 N6557H RAL → RAL Jul 12, 01:50 UTCJul 12, 03:05 UTC1h 15m
2026-07-11 N6557H RAL → RAL Jul 11, 20:00 UTCJul 11, 20:40 UTC40m
2026-07-11 N6557H RAL → RAL Jul 11, 17:50 UTCJul 11, 18:15 UTC25m
2026-07-10 N6557H RAL → RAL Jul 10, 18:00 UTCJul 10, 19:45 UTC1h 45m
2026-07-10 N6557H RAL → RAL Jul 10, 15:40 UTCJul 10, 16:55 UTC1h 15m
2026-07-10 N6557H RAL → RAL Jul 10, 14:50 UTCJul 10, 14:55 UTC5m
2026-07-10 N6557H RAL → RAL Jul 10, 14:25 UTCJul 10, 14:35 UTC10m
2026-07-10 N6557H RAL → RAL Jul 10, 13:55 UTCJul 10, 14:15 UTC20m
2026-07-09 N6557H RAL → RAL Jul 9, 23:40 UTCJul 10, 00:50 UTC1h 10m
2026-07-09 N6557H RAL → RAL Jul 9, 21:30 UTCJul 9, 22:35 UTC1h 5m
2026-07-09 N6557H RAL → RAL Jul 9, 17:45 UTCJul 9, 19:00 UTC1h 15m
2026-07-09 N6557H RAL → RAL Jul 9, 15:55 UTCJul 9, 16:50 UTC55m
2026-07-08 N6557H RAL → RAL Jul 8, 19:40 UTCJul 8, 20:55 UTC1h 15m
2026-07-08 N6557H RAL → RAL Jul 8, 17:50 UTCJul 8, 18:45 UTC55m
2026-07-08 N6557H RAL → RAL Jul 8, 15:50 UTCJul 8, 16:45 UTC55m
2026-07-07 N6557H RAL → RAL Jul 7, 22:55 UTCJul 7, 23:50 UTC55m
2026-07-07 N6557H RAL → RAL Jul 7, 17:50 UTCJul 7, 18:50 UTC1h 0m
2026-07-07 N6557H RAL → RAL Jul 7, 15:50 UTCJul 7, 16:55 UTC1h 5m
2026-07-06 N6557H RAL → RAL Jul 6, 22:20 UTCJul 6, 23:45 UTC1h 25m
2026-07-06 N6557H RAL → RAL Jul 6, 20:25 UTCJul 6, 20:55 UTC30m
2026-07-06 N6557H RAL → RAL Jul 6, 17:40 UTCJul 6, 18:05 UTC25m
2026-07-06 N6557H RAL → RAL Jul 6, 15:30 UTCJul 6, 16:55 UTC1h 25m
2026-07-05 N6557H RAL → RAL Jul 5, 19:45 UTCJul 5, 22:40 UTC2h 55m
2026-07-05 N6557H - Jul 5, 03:05 UTCJul 5, 04:15 UTC1h 10m
2026-07-05 N6557H - Jul 5, 00:45 UTCJul 5, 02:20 UTC1h 35m
2026-07-04 N6557H RAL → RAL Jul 4, 17:40 UTCJul 4, 18:30 UTC50m
2026-07-04 N6557H RAL → RAL Jul 4, 01:20 UTCJul 4, 01:25 UTC5m
2026-07-03 N6557H RAL → RAL Jul 3, 23:50 UTCJul 4, 01:15 UTC1h 25m
2026-07-03 N6557H RAL → RAL Jul 3, 18:00 UTCJul 3, 19:35 UTC1h 35m
2026-07-03 N6557H - Jul 3, 04:15 UTCJul 3, 04:45 UTC30m
2026-07-03 N6557H - Jul 3, 02:50 UTCJul 3, 03:25 UTC35m
2026-07-03 N6557H - Jul 3, 01:40 UTCJul 3, 02:00 UTC20m
2026-07-02 N6557H - Jul 2, 23:45 UTCJul 3, 00:00 UTC15m
2026-07-02 N6557H RAL → RAL Jul 2, 22:15 UTCJul 2, 23:00 UTC45m
2026-07-02 N6557H RAL → RAL Jul 2, 19:50 UTCJul 2, 20:50 UTC1h 0m
2026-07-02 N6557H RAL → RAL Jul 2, 17:35 UTCJul 2, 18:30 UTC55m
2026-07-02 N6557H RAL → RAL Jul 2, 00:50 UTCJul 2, 00:55 UTC5m
2026-07-01 N6557H RAL → RAL Jul 1, 23:40 UTCJul 2, 00:40 UTC1h 0m
2026-07-01 N6557H RAL → RAL Jul 1, 19:55 UTCJul 1, 20:40 UTC45m
2026-07-01 N6557H RAL → RAL Jul 1, 17:35 UTCJul 1, 18:40 UTC1h 5m
2026-06-30 N6557H RAL → RAL Jun 30, 23:25 UTCJun 30, 23:35 UTC10m
2026-06-30 N6557H RAL → RAL Jun 30, 22:25 UTCJun 30, 23:05 UTC40m
2026-06-30 N6557H RAL → RAL Jun 30, 17:45 UTCJun 30, 18:55 UTC1h 10m
2026-06-29 N6557H RAL → RAL Jun 29, 23:49 UTCJun 30, 01:14 UTC1h 25m
2026-06-29 N6557H RAL → RAL Jun 29, 21:19 UTCJun 29, 21:50 UTC30m
2026-06-29 N6557H RAL → RAL Jun 29, 17:49 UTCJun 29, 19:44 UTC1h 55m

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 N6557H page for operator, model, and routing details .

Mode-S A8A2A2 frequently asked

What is Mode-S code A8A2A2?
A8A2A2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N6557H.
Where is Mode-S A8A2A2 registered?
Mode-S code A8A2A2 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 A8A2A2 broadcasting right now?
Mode-S A8A2A2 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8A2A2, octal 52121242, decimal 11,051,682.
What flights does A8A2A2 operate?
Mode-S A8A2A2 has broadcast 1 distinct callsign, including N6557H.