sensors Mode-S transponder

A4B49C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N402FR · AIRBUS A-320neo · operated by FRONTIER AIRLINES INC.

Hex
A4B49C
Octal
51132234
Decimal
10,794,140
Country
US
Tail
N402FR
Type
A20N
No current signal · last broadcast 12h ago
Flights observed
14
Distinct callsigns
9
Country
US
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S A4B49C.

Country allocation

The ICAO 24-bit address A4B49C 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 9 distinct

Callsign Airline Flights Last seen
FFT1902 - 4 2026-04-13
FFT4966 Frontier Airlines 2 2026-04-14
FFT1191 - 2 2026-04-13
FFT3871 - 1 2026-04-13
FFT2851 - 1 2026-04-13
FFT1981 - 1 2026-04-12
FFT1571 - 1 2026-04-13
FFT1504 - 1 2026-04-13
FFT1439 - 1 2026-04-13

Recent flights last 14

DateFlightRouteTakeoffLandingDuration
2026-04-14 FFT4966 LAS → CLE Apr 14, 09:10 UTCApr 14, 10:50 UTC1h 40m
2026-04-14 FFT4966 LAS → CLE Apr 14, 07:12 UTCApr 14, 10:57 UTC3h 45m
2026-04-13 FFT2851 PHX → GEG Apr 13, 21:25 UTCApr 13, 23:45 UTC2h 20m
2026-04-13 FFT3871 SLC → PHX Apr 13, 18:25 UTCApr 13, 19:40 UTC1h 15m
2026-04-13 FFT1902 - Apr 13, 16:15 UTCApr 13, 16:35 UTC20m
2026-04-13 FFT1902 - Apr 13, 15:50 UTCApr 13, 16:35 UTC45m
2026-04-13 FFT1902 - Apr 13, 15:23 UTCApr 13, 17:06 UTC1h 43m
2026-04-13 FFT1902 - Apr 13, 15:23 UTCApr 13, 16:29 UTC1h 6m
2026-04-13 FFT1571 PHX → SAN Apr 13, 13:13 UTCApr 13, 14:05 UTC52m
2026-04-13 FFT1439 SLC → PHX Apr 13, 05:00 UTCApr 13, 06:25 UTC1h 25m
2026-04-13 FFT1504 SFO → SLC Apr 13, 02:00 UTCApr 13, 03:20 UTC1h 20m
2026-04-13 FFT1191 - Apr 13, 00:20 UTCApr 13, 00:50 UTC30m
2026-04-12 FFT1191 - Apr 12, 23:55 UTCApr 13, 00:50 UTC55m
2026-04-12 FFT1981 - Apr 12, 18:35 UTCApr 12, 20:15 UTC1h 40m

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 N402FR page for operator, model, and routing details .

Mode-S A4B49C frequently asked

What is Mode-S code A4B49C?
A4B49C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N402FR.
Where is Mode-S A4B49C registered?
Mode-S code A4B49C 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 A4B49C broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4B49C, octal 51132234, decimal 10,794,140.
What flights does A4B49C operate?
Mode-S A4B49C has broadcast 9 distinct callsigns, including FFT1902, FFT4966, FFT1191, FFT3871, FFT2851.