Apparatus

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sensors Mode-S transponder

A8F646

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N677FR · AIRBUS A-321neo · operated by FRONTIER AIRLINES INC.

Hex
A8F646
Octal
52173106
Decimal
11,073,094
Country
US
Tail
N677FR
Type
A21N
Broadcasting now · callsign FFT3346 · 33,000 ft
Flights observed
545
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:20 UTC

Current position

A8F646 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A8F646 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
FFT4113 - 7 2026-07-18
FFT1958 - 7 2026-07-17
FFT1957 - 7 2026-07-16
FFT1703 - 7 2026-07-16
FFT1191 - 7 2026-07-16
FFT4702 Frontier Airlines 6 2026-06-11
FFT4410 - 6 2026-07-11
FFT4048 Frontier Airlines 6 2026-06-04
FFT3600 - 6 2026-07-12
FFT1177 - 6 2026-06-15
FFT1019 - 6 2026-06-24
FFT4768 Frontier Airlines 5 2026-05-02
FFT4671 Frontier Airlines 5 2026-07-17
FFT4545 - 5 2026-06-15
FFT2959 - 5 2026-07-11
FFT2698 Frontier Airlines 5 2026-06-04
FFT1896 - 5 2026-07-16
FFT1490 - 5 2026-07-02
FFT1375 Frontier Airlines 5 2026-05-02
FFT1176 - 5 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FFT2919 CLE → TPA Jul 26, 18:20 UTCJul 26, 20:20 UTC2h 0m
2026-07-26 FFT2684 TPA → CLE Jul 26, 14:20 UTCJul 26, 16:35 UTC2h 15m
2026-07-26 FFT2684 TPA → CLE Jul 26, 14:19 UTCJul 26, 16:32 UTC2h 13m
2026-07-26 FFT3679 CLE → TPA Jul 26, 10:35 UTCJul 26, 12:30 UTC1h 55m
2026-07-26 FFT3451 MDW → PHX Jul 26, 00:20 UTCJul 26, 02:55 UTC2h 35m
2026-07-25 FFT3452 PHX → MDW Jul 25, 20:20 UTCJul 25, 22:35 UTC2h 15m
2026-07-25 FFT3452 PHX → MDW Jul 25, 20:15 UTCJul 25, 22:33 UTC2h 18m
2026-07-25 FFT1045 CLE → MCO Jul 25, 15:50 UTCJul 25, 18:10 UTC2h 20m
2026-07-25 FFT1045 CLE → MCO Jul 25, 15:47 UTCJul 25, 18:07 UTC2h 20m
2026-07-25 FFT1046 CLE → FLL Jul 25, 11:55 UTCJul 25, 14:10 UTC2h 15m
2026-07-24 FFT3232 LAS → CLE Jul 24, 22:35 UTCJul 25, 02:15 UTC3h 40m
2026-07-24 FFT1601 PHL → MCO Jul 24, 15:36 UTCJul 24, 20:42 UTC5h 6m
2026-07-24 FFT1601 PHL → MCO Jul 24, 15:45 UTCJul 24, 20:45 UTC5h 0m
2026-07-24 FFT2112 ORD → PHL Jul 24, 02:35 UTCJul 24, 04:00 UTC1h 25m
2026-07-23 FFT2111 PHL → ORD Jul 23, 23:15 UTCJul 24, 00:55 UTC1h 40m
2026-07-23 FFT22 PHL → PUJ Jul 23, 11:15 UTCJul 23, 20:25 UTC9h 10m
2026-07-22 FFT180 SDQ → PHL Jul 22, 22:25 UTCJul 23, 01:00 UTC2h 35m
2026-07-22 FFT181 PHL → SDQ Jul 22, 12:20 UTCJul 22, 20:45 UTC8h 25m
2026-07-22 FFT2836 TPA → PHL Jul 22, 04:40 UTCJul 22, 05:25 UTC45m
2026-07-22 FFT2269 LGA → ATL Jul 22, 01:05 UTCJul 22, 03:20 UTC2h 15m
2026-07-21 FFT4170 MCO → PHL Jul 21, 18:50 UTCJul 21, 20:45 UTC1h 55m
2026-07-21 FFT4003 - Jul 21, 02:20 UTCJul 21, 04:05 UTC1h 45m
2026-07-20 FFT4004 MCO → BWI Jul 20, 22:35 UTCJul 21, 00:50 UTC2h 14m
2026-07-20 FFT4725 - Jul 20, 18:35 UTCJul 20, 19:30 UTC55m
2026-07-20 FFT4725 - Jul 20, 16:50 UTCJul 20, 17:05 UTC15m
2026-07-20 FFT2250 ATL → BDL Jul 20, 14:55 UTCJul 20, 15:05 UTC10m
2026-07-20 FFT2250 ATL → BDL Jul 20, 12:45 UTCJul 20, 13:20 UTC35m
2026-07-20 FFT1242 ATL → MCO Jul 20, 09:15 UTCJul 20, 10:15 UTC1h 0m
2026-07-20 FFT2400 IAH → ATL Jul 20, 02:50 UTCJul 20, 04:25 UTC1h 35m
2026-07-20 FFT2400 IAH → ATL Jul 20, 02:48 UTCJul 20, 04:22 UTC1h 34m
2026-07-19 FFT3067 BWI → IAH Jul 19, 22:45 UTCJul 20, 01:30 UTC2h 45m
2026-07-19 FFT2634 FLL → SWF Jul 19, 19:50 UTCJul 19, 21:15 UTC1h 25m
2026-07-19 FFT2634 FLL → SWF Jul 19, 15:05 UTCJul 19, 16:45 UTC1h 40m
2026-07-19 FFT1403 ATL → IAH Jul 19, 10:40 UTCJul 19, 12:15 UTC1h 35m
2026-07-19 FFT3053 TPA → ATL Jul 19, 01:10 UTCJul 19, 02:30 UTC1h 20m
2026-07-18 FFT3054 ATL → TPA Jul 18, 22:50 UTCJul 18, 23:50 UTC1h 0m
2026-07-18 FFT2899 DTW → ATL Jul 18, 19:10 UTCJul 18, 20:35 UTC1h 25m
2026-07-18 FFT2899 DTW → ATL Jul 18, 19:07 UTCJul 18, 20:30 UTC1h 23m
2026-07-18 FFT2898 ATL → DTW Jul 18, 16:15 UTCJul 18, 17:40 UTC1h 25m
2026-07-18 FFT1596 - Jul 18, 12:55 UTCJul 18, 14:15 UTC1h 20m
2026-07-18 FFT2146 LAS → ORD Jul 18, 07:50 UTCJul 18, 11:05 UTC3h 15m
2026-07-18 FFT4113 - Jul 18, 05:25 UTCJul 18, 06:10 UTC45m
2026-07-18 FFT4113 PHX → LAS Jul 18, 05:20 UTCJul 18, 06:06 UTC46m
2026-07-17 FFT4671 DTW → PHX Jul 17, 23:50 UTCJul 18, 03:10 UTC3h 21m
2026-07-17 FFT1958 - Jul 17, 20:04 UTCJul 17, 22:29 UTC2h 25m
2026-07-17 FFT1958 IAH → DTW Jul 17, 20:07 UTCJul 17, 22:20 UTC2h 13m
2026-07-17 FFT4184 PHX → IAH Jul 17, 16:17 UTCJul 17, 18:38 UTC2h 21m
2026-07-17 FFT4184 - Jul 17, 16:24 UTCJul 17, 18:40 UTC2h 15m
2026-07-17 FFT4949 SLC → PHX Jul 17, 03:14 UTCJul 17, 04:29 UTC1h 15m
2026-07-17 FFT3394 - Jul 17, 00:55 UTCJul 17, 02:15 UTC1h 20m

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 N677FR page for operator, model, and routing details .

Mode-S A8F646 frequently asked

What is Mode-S code A8F646?
A8F646 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N677FR.
Where is Mode-S A8F646 registered?
Mode-S code A8F646 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 A8F646 broadcasting right now?
Yes. Mode-S A8F646 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8F646, octal 52173106, decimal 11,073,094.
What flights does A8F646 operate?
Mode-S A8F646 has broadcast 20 distinct callsigns, including FFT4113, FFT1958, FFT1957, FFT1703, FFT1191.