Apparatus

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sensors Mode-S transponder

A8FDB4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N679FR · operated by FRONTIER AIRLINES INC.

Hex
A8FDB4
Octal
52176664
Decimal
11,074,996
Country
US
Tail
N679FR
No current signal · last broadcast 4h ago
Flights observed
258
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A8FDB4.

Country allocation

The ICAO 24-bit address A8FDB4 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 20 distinct

Callsign Airline Flights Last seen
FFT2266 - 5 2026-07-01
FFT4726 Frontier Airlines 4 2026-06-09
FFT33 - 4 2026-06-18
FFT2715 Frontier Airlines 4 2026-06-14
FFT1495 Frontier Airlines 4 2026-06-11
FFT3937 Frontier Airlines 3 2026-07-07
FFT3736 Frontier Airlines 3 2026-06-01
FFT3068 Frontier Airlines 3 2026-06-11
FFT2982 Frontier Airlines 3 2026-06-07
FFT2886 - 3 2026-07-06
FFT2867 Frontier Airlines 3 2026-06-07
FFT239 Frontier Airlines 3 2026-06-18
FFT2082 - 3 2026-07-04
FFT1483 - 3 2026-06-21
FFT9579 - 2 2026-07-07
FFT9479 - 2 2026-07-13
FFT9401 - 2 2026-06-18
FFT9079 Frontier Airlines 2 2026-05-22
FFT4891 Frontier Airlines 2 2026-06-12
FFT4732 - 2 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 FFT1728 - Jul 13, 20:25 UTCJul 14, 00:35 UTC4h 10m
2026-07-13 FFT1728 LAS → MCO Jul 13, 20:28 UTCJul 14, 00:30 UTC4h 2m
2026-07-13 FFT9479 DFW → LAS Jul 13, 15:10 UTCJul 13, 17:25 UTC2h 15m
2026-07-13 FFT3972 - Jul 13, 01:20 UTCJul 13, 03:25 UTC2h 5m
2026-07-12 FFT3972 - Jul 12, 21:15 UTCJul 12, 22:20 UTC1h 5m
2026-07-12 FFT3303 - Jul 12, 18:50 UTCJul 12, 19:45 UTC55m
2026-07-12 FFT1085 - Jul 12, 13:30 UTCJul 12, 17:20 UTC3h 50m
2026-07-12 FFT2415 - Jul 12, 09:50 UTCJul 12, 11:45 UTC1h 55m
2026-07-12 FFT2112 - Jul 12, 03:20 UTCJul 12, 04:45 UTC1h 25m
2026-07-11 FFT2111 PHL → ORD Jul 11, 23:55 UTCJul 12, 01:35 UTC1h 40m
2026-07-11 FFT3480 - Jul 11, 18:20 UTCJul 11, 20:05 UTC1h 45m
2026-07-11 FFT2815 - Jul 11, 15:30 UTCJul 11, 17:00 UTC1h 30m
2026-07-11 FFT2815 PHL → JAX Jul 11, 15:13 UTCJul 11, 17:00 UTC1h 47m
2026-07-11 FFT1602 LAS → PHL Jul 11, 06:20 UTCJul 11, 10:25 UTC4h 5m
2026-07-10 FFT3450 LAS → LAS Jul 10, 23:45 UTCJul 11, 04:25 UTC4h 40m
2026-07-10 FFT4244 - Jul 10, 20:50 UTCJul 10, 21:40 UTC50m
2026-07-10 FFT4243 - Jul 10, 18:05 UTCJul 10, 18:55 UTC50m
2026-07-10 FFT2145 PHL → LAS Jul 10, 13:05 UTCJul 10, 16:20 UTC3h 15m
2026-07-10 FFT3136 - Jul 10, 03:40 UTCJul 10, 05:50 UTC2h 10m
2026-07-10 FFT3136 IAH → ORD Jul 10, 03:43 UTCJul 10, 05:39 UTC1h 56m
2026-07-09 FFT3135 - Jul 9, 23:25 UTCJul 10, 01:55 UTC2h 30m
2026-07-09 FFT1342 DFW → ORD Jul 9, 19:00 UTCJul 9, 20:50 UTC1h 50m
2026-07-09 FFT3241 ORD → DFW Jul 9, 15:00 UTCJul 9, 16:50 UTC1h 50m
2026-07-09 FFT3241 ORD → DFW Jul 9, 14:43 UTCJul 9, 17:00 UTC2h 17m
2026-07-09 FFT1441 ATL → ORD Jul 9, 11:15 UTCJul 9, 12:45 UTC1h 30m
2026-07-09 FFT4347 LGA → ATL Jul 9, 03:15 UTCJul 9, 05:00 UTC1h 45m
2026-07-09 FFT4347 LGA → ATL Jul 9, 03:04 UTCJul 9, 05:01 UTC1h 57m
2026-07-08 FFT3458 - Jul 8, 23:30 UTCJul 9, 01:40 UTC2h 10m
2026-07-08 FFT1407 - Jul 8, 19:15 UTCJul 8, 20:50 UTC1h 35m
2026-07-08 FFT1408 - Jul 8, 16:05 UTCJul 8, 17:40 UTC1h 35m
2026-07-08 FFT1596 ORD → ATL Jul 8, 13:00 UTCJul 8, 14:30 UTC1h 30m
2026-07-08 FFT3345 - Jul 8, 01:55 UTCJul 8, 04:20 UTC2h 25m
2026-07-08 FFT3345 - Jul 8, 00:00 UTCJul 8, 00:15 UTC15m
2026-07-07 FFT4420 - Jul 7, 18:35 UTCJul 7, 22:05 UTC3h 30m
2026-07-07 FFT3937 SJU → BDL Jul 7, 15:00 UTCJul 7, 17:05 UTC2h 5m
2026-07-07 FFT3937 SJU → BDL Jul 7, 13:05 UTCJul 7, 13:15 UTC10m
2026-07-07 FFT3937 SJU → BDL Jul 7, 12:58 UTCJul 7, 17:00 UTC4h 2m
2026-07-07 FFT9579 - Jul 7, 11:00 UTCJul 7, 11:20 UTC20m
2026-07-07 FFT9579 - Jul 7, 07:45 UTCJul 7, 09:15 UTC1h 30m
2026-07-07 FFT2552 PHL → PHL Jul 7, 05:40 UTCJul 7, 05:50 UTC10m
2026-07-07 FFT2552 - Jul 7, 03:30 UTCJul 7, 05:20 UTC1h 50m
2026-07-07 FFT4025 MCO → ATL Jul 7, 00:05 UTCJul 7, 01:05 UTC1h 0m
2026-07-06 FFT2769 - Jul 6, 17:30 UTCJul 6, 20:25 UTC2h 55m
2026-07-06 FFT1684 - Jul 6, 13:05 UTCJul 6, 15:25 UTC2h 20m
2026-07-06 FFT2886 MCO → MCO Jul 6, 06:45 UTCJul 6, 06:50 UTC5m
2026-07-06 FFT2886 DFW → MCO Jul 6, 03:00 UTCJul 6, 05:05 UTC2h 5m
2026-07-05 FFT1481 MCO → DFW Jul 5, 22:40 UTCJul 6, 01:05 UTC2h 25m
2026-07-05 FFT4725 - Jul 5, 19:15 UTCJul 5, 20:00 UTC45m
2026-07-05 FFT4725 - Jul 5, 17:30 UTCJul 5, 17:45 UTC15m
2026-07-04 FFT2082 - Jul 4, 15:55 UTCJul 4, 19:05 UTC3h 10m

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 N679FR page for operator, model, and routing details .

Mode-S A8FDB4 frequently asked

What is Mode-S code A8FDB4?
A8FDB4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N679FR.
Where is Mode-S A8FDB4 registered?
Mode-S code A8FDB4 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 A8FDB4 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8FDB4, octal 52176664, decimal 11,074,996.
What flights does A8FDB4 operate?
Mode-S A8FDB4 has broadcast 20 distinct callsigns, including FFT2266, FFT4726, FFT33, FFT2715, FFT1495.