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
No current signal · last broadcast 5h ago
Flights observed
137
Distinct callsigns
1
Country
US
Last broadcast
5h 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 - 137 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 N6557H - May 29, 21:50 UTCMay 29, 22:45 UTC55m
2026-05-29 N6557H RAL → RAL May 29, 20:25 UTCMay 29, 21:05 UTC40m
2026-05-28 N6557H - May 28, 20:15 UTCMay 28, 21:15 UTC1h 0m
2026-05-28 N6557H - May 28, 18:05 UTCMay 28, 19:00 UTC55m
2026-05-27 N6557H RAL → RAL May 27, 23:35 UTCMay 28, 00:50 UTC1h 15m
2026-05-27 N6557H RAL → RAL May 27, 21:35 UTCMay 27, 22:30 UTC55m
2026-05-27 N6557H CNO → RAL May 27, 20:05 UTCMay 27, 20:20 UTC15m
2026-05-27 N6557H RAL → CNO May 27, 17:40 UTCMay 27, 18:40 UTC1h 0m
2026-05-26 N6557H RAL → RAL May 26, 17:50 UTCMay 26, 18:50 UTC1h 0m
2026-05-25 N6557H - May 25, 23:40 UTCMay 26, 00:35 UTC55m
2026-05-25 N6557H RAL → AVX May 25, 22:00 UTCMay 25, 22:49 UTC50m
2026-05-25 N6557H RAL → RAL May 25, 19:44 UTCMay 25, 20:50 UTC1h 5m
2026-05-25 N6557H RAL → RAL May 25, 16:05 UTCMay 25, 16:40 UTC35m
2026-05-24 N6557H RAL → RAL May 24, 19:05 UTCMay 24, 20:05 UTC1h 0m
2026-05-22 N6557H RAL → RAL May 22, 23:45 UTCMay 23, 00:50 UTC1h 5m
2026-05-22 N6557H RAL → RAL May 22, 22:00 UTCMay 22, 23:00 UTC1h 0m
2026-05-22 N6557H RAL → RAL May 22, 20:30 UTCMay 22, 21:10 UTC40m
2026-05-22 N6557H RAL → RAL May 22, 17:55 UTCMay 22, 18:45 UTC50m
2026-05-21 N6557H RAL → RAL May 21, 21:20 UTCMay 21, 21:55 UTC35m
2026-05-21 N6557H RAL → RAL May 21, 18:30 UTCMay 21, 18:45 UTC15m
2026-05-19 N6557H RAL → RAL May 19, 19:50 UTCMay 19, 20:50 UTC1h 0m
2026-05-19 N6557H RAL → RAL May 19, 18:05 UTCMay 19, 18:50 UTC45m
2026-05-18 N6557H RAL → RAL May 18, 21:40 UTCMay 18, 22:40 UTC1h 0m
2026-05-18 N6557H RAL → RAL May 18, 04:40 UTCMay 18, 05:30 UTC50m
2026-05-17 N6557H RAL → RAL May 17, 20:15 UTCMay 17, 20:50 UTC35m
2026-05-17 N6557H RAL → RAL May 17, 18:10 UTCMay 17, 18:50 UTC40m
2026-05-17 N6557H RAL → RAL May 17, 02:00 UTCMay 17, 02:45 UTC45m
2026-05-16 N6557H RAL → RAL May 16, 23:30 UTCMay 17, 00:50 UTC1h 20m
2026-05-16 N6557H RAL → RAL May 16, 17:50 UTCMay 16, 18:40 UTC50m
2026-05-16 N6557H RAL → RAL May 16, 16:50 UTCMay 16, 17:05 UTC15m
2026-05-16 N6557H RAL → RAL May 16, 00:35 UTCMay 16, 01:45 UTC1h 10m
2026-05-14 N6557H AVX → RAL May 14, 23:25 UTCMay 15, 00:35 UTC1h 10m
2026-05-14 N6557H RAL → AVX May 14, 22:00 UTCMay 14, 22:55 UTC55m
2026-05-14 N6557H RAL → RAL May 14, 19:50 UTCMay 14, 20:45 UTC55m
2026-05-14 N6557H RAL → RAL May 14, 17:35 UTCMay 14, 18:40 UTC1h 5m
2026-05-14 N6557H RAL → RAL May 14, 15:50 UTCMay 14, 16:50 UTC1h 0m
2026-05-13 N6557H RAL → RAL May 13, 23:30 UTCMay 14, 00:45 UTC1h 15m
2026-05-13 N6557H RAL → RAL May 13, 19:40 UTCMay 13, 20:35 UTC55m
2026-05-12 N6557H RAL → RAL May 12, 21:25 UTCMay 12, 22:45 UTC1h 20m
2026-05-12 N6557H RAL → RAL May 12, 18:00 UTCMay 12, 18:50 UTC50m
2026-05-11 N6557H RAL → RAL May 11, 19:55 UTCMay 11, 20:50 UTC55m
2026-05-10 N6557H RAL → RAL May 10, 21:19 UTCMay 10, 21:49 UTC30m
2026-05-10 N6557H RAL → RAL May 10, 20:05 UTCMay 10, 21:14 UTC1h 10m
2026-05-10 N6557H RAL → RAL May 10, 17:55 UTCMay 10, 18:55 UTC1h 0m
2026-05-09 N6557H RAL → RAL May 9, 22:10 UTCMay 10, 00:05 UTC1h 55m
2026-05-09 N6557H RAL → RAL May 9, 18:00 UTCMay 9, 19:10 UTC1h 10m
2026-05-09 N6557H RAL → RAL May 9, 01:50 UTCMay 9, 02:55 UTC1h 5m
2026-05-08 N6557H RAL → RAL May 8, 21:45 UTCMay 8, 22:50 UTC1h 5m
2026-05-07 N6557H RAL → RAL May 7, 23:45 UTCMay 8, 00:40 UTC55m
2026-05-07 N6557H - May 7, 22:15 UTCMay 7, 22:50 UTC35m

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?
No active broadcast right now. Last signal was 5h ago.
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.