Apparatus

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sensors Mode-S transponder

A1C48C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2129J · CESSNA 172 Skyhawk · operated by INFINITY FLIGHT GROUP LLC

Hex
A1C48C
Octal
50342214
Decimal
10,601,612
Country
US
Tail
N2129J
Type
C172
Broadcasting now · callsign N2129J · 2,025 ft
Flights observed
35
Distinct callsigns
1
Country
US
Last broadcast
2h ago

Current position

A1C48C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A1C48C 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
N2129J - 35 2026-04-18

Recent flights last 35

DateFlightRouteTakeoffLandingDuration
2026-04-18 N2129J - Apr 18, 15:00 UTCApr 18, 15:35 UTC35m
2026-04-18 N2129J - Apr 18, 04:45 UTCApr 18, 05:25 UTC40m
2026-04-18 N2129J - Apr 18, 04:00 UTCApr 18, 05:20 UTC1h 20m
2026-04-18 N2129J - Apr 18, 01:25 UTCApr 18, 02:20 UTC55m
2026-04-17 N2129J - Apr 17, 23:25 UTCApr 18, 01:20 UTC1h 55m
2026-04-17 N2129J - Apr 17, 23:00 UTCApr 17, 23:20 UTC20m
2026-04-17 N2129J - Apr 17, 16:00 UTCApr 17, 16:25 UTC25m
2026-04-17 N2129J - Apr 17, 13:20 UTCApr 17, 13:30 UTC10m
2026-04-17 N2129J - Apr 17, 12:50 UTCApr 17, 13:15 UTC25m
2026-04-17 N2129J - Apr 17, 04:10 UTCApr 17, 05:10 UTC1h 1m
2026-04-17 N2129J - Apr 17, 02:05 UTCApr 17, 03:15 UTC1h 10m
2026-04-16 N2129J - Apr 16, 22:24 UTCApr 16, 23:10 UTC45m
2026-04-16 N2129J - Apr 16, 21:14 UTCApr 16, 21:24 UTC10m
2026-04-16 N2129J - Apr 16, 19:15 UTCApr 16, 21:10 UTC1h 55m
2026-04-16 N2129J - Apr 16, 18:05 UTCApr 16, 19:10 UTC1h 5m
2026-04-16 N2129J TTN → EWB Apr 16, 15:20 UTCApr 16, 16:50 UTC1h 30m
2026-04-16 N2129J - Apr 16, 13:15 UTCApr 16, 13:35 UTC20m
2026-04-16 N2129J - Apr 16, 12:34 UTCApr 16, 13:05 UTC30m
2026-04-16 N2129J - Apr 16, 05:09 UTCApr 16, 05:29 UTC20m
2026-04-16 N2129J - Apr 16, 03:55 UTCApr 16, 05:05 UTC1h 10m
2026-04-16 N2129J - Apr 16, 02:19 UTCApr 16, 03:00 UTC40m
2026-04-16 N2129J - Apr 16, 01:10 UTCApr 16, 01:45 UTC35m
2026-04-15 N2129J - Apr 15, 23:10 UTCApr 16, 01:05 UTC1h 55m
2026-04-15 N2129J - Apr 15, 22:50 UTCApr 15, 23:00 UTC10m
2026-04-15 N2129J - Apr 15, 17:05 UTCApr 15, 18:25 UTC1h 20m
2026-04-15 N2129J - Apr 15, 13:10 UTCApr 15, 14:35 UTC1h 25m
2026-04-15 N2129J - Apr 15, 11:35 UTCApr 15, 12:55 UTC1h 20m
2026-04-14 N2129J - Apr 14, 18:55 UTCApr 14, 19:20 UTC25m
2026-04-14 N2129J - Apr 14, 17:40 UTCApr 14, 18:45 UTC1h 5m
2026-04-14 N2129J TTN → TTN Apr 14, 16:00 UTCApr 14, 16:30 UTC30m
2026-04-14 N2129J - Apr 14, 14:50 UTCApr 14, 15:05 UTC15m
2026-04-14 N2129J - Apr 14, 12:55 UTCApr 14, 14:45 UTC1h 50m
2026-04-14 N2129J - Apr 14, 10:50 UTCApr 14, 11:55 UTC1h 5m
2026-04-13 N2129J - Apr 13, 01:00 UTCApr 13, 02:50 UTC1h 50m
2026-04-12 N2129J - Apr 12, 19:40 UTCApr 12, 20:15 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 N2129J page for operator, model, and routing details .

Mode-S A1C48C frequently asked

What is Mode-S code A1C48C?
A1C48C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2129J.
Where is Mode-S A1C48C registered?
Mode-S code A1C48C 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 A1C48C broadcasting right now?
Yes. Mode-S A1C48C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1C48C, octal 50342214, decimal 10,601,612.
What flights does A1C48C operate?
Mode-S A1C48C has broadcast 1 distinct callsign, including N2129J.