Apparatus

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sensors Mode-S transponder

A8EB21

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N674FR · AIRBUS A-321neo · operated by FRONTIER AIRLINES INC.

Hex
A8EB21
Octal
52165441
Decimal
11,070,241
Country
US
Tail
N674FR
Type
A21N
Broadcasting now · callsign FFT2791 · 25,300 ft
Flights observed
401
Distinct callsigns
20
Country
US
Last broadcast
27m ago

Current position

A8EB21 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A8EB21 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
FFT2338 - 9 2026-07-07
FFT2715 - 8 2026-07-07
FFT3913 Frontier Airlines 7 2026-05-22
FFT3679 - 7 2026-07-11
FFT2919 - 7 2026-07-11
FFT1492 - 7 2026-07-11
FFT4158 - 6 2026-07-02
FFT4036 - 6 2026-07-07
FFT3068 - 6 2026-06-27
FFT2684 - 6 2026-07-11
FFT4173 Frontier Airlines 5 2026-04-25
FFT3735 - 5 2026-07-06
FFT3452 Frontier Airlines 5 2026-07-05
FFT3339 Frontier Airlines 5 2026-04-20
FFT2409 - 5 2026-07-06
FFT1283 Frontier Airlines 5 2026-05-26
FFT4895 Frontier Airlines 4 2026-07-04
FFT3736 Frontier Airlines 4 2026-06-07
FFT1403 - 4 2026-06-27
FFT1384 Frontier Airlines 4 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 FFT3560 BNA → MCO Jul 13, 23:40 UTCJul 14, 01:10 UTC1h 30m
2026-07-13 FFT3559 MCO → BNA Jul 13, 19:40 UTCJul 13, 21:30 UTC1h 50m
2026-07-13 FFT3559 MCO → BNA Jul 13, 19:02 UTCJul 13, 22:17 UTC3h 15m
2026-07-13 FFT1654 - Jul 13, 15:05 UTCJul 13, 17:35 UTC2h 30m
2026-07-13 FFT1653 - Jul 13, 11:15 UTCJul 13, 13:45 UTC2h 30m
2026-07-13 FFT1653 MCO → SAT Jul 13, 11:13 UTCJul 13, 13:41 UTC2h 28m
2026-07-12 FFT1728 - Jul 12, 23:45 UTCJul 13, 04:10 UTC4h 25m
2026-07-12 FFT4277 IAD → LAS Jul 12, 15:35 UTCJul 12, 19:40 UTC4h 5m
2026-07-12 FFT4278 LAS → IAD Jul 12, 08:01 UTCJul 12, 12:10 UTC4h 10m
2026-07-12 FFT1821 - Jul 12, 02:05 UTCJul 12, 06:01 UTC3h 55m
2026-07-11 FFT1492 TPA → CLE Jul 11, 22:30 UTCJul 12, 00:30 UTC2h 0m
2026-07-11 FFT2919 - Jul 11, 18:15 UTCJul 11, 20:40 UTC2h 25m
2026-07-11 FFT2684 TPA → CLE Jul 11, 14:40 UTCJul 11, 16:40 UTC2h 0m
2026-07-11 FFT3679 - Jul 11, 10:50 UTCJul 11, 12:50 UTC2h 0m
2026-07-10 FFT3232 - Jul 10, 22:25 UTCJul 11, 01:50 UTC3h 25m
2026-07-10 FFT1601 PHL → LAS Jul 10, 15:40 UTCJul 10, 20:25 UTC4h 45m
2026-07-10 FFT4170 - Jul 10, 03:10 UTCJul 10, 05:05 UTC1h 55m
2026-07-09 FFT3044 - Jul 9, 22:30 UTCJul 10, 00:40 UTC2h 10m
2026-07-09 FFT45 CUN → ORD Jul 9, 16:15 UTCJul 9, 19:35 UTC3h 20m
2026-07-09 FFT86 STL → CUN Jul 9, 11:45 UTCJul 9, 14:20 UTC2h 35m
2026-07-09 FFT2635 MCO → STL Jul 9, 04:25 UTCJul 9, 06:25 UTC2h 0m
2026-07-08 FFT3044 - Jul 8, 22:55 UTCJul 9, 01:10 UTC2h 15m
2026-07-08 FFT45 CUN → ORD Jul 8, 17:15 UTCJul 8, 20:25 UTC3h 10m
2026-07-08 FFT86 STL → CUN Jul 8, 13:20 UTCJul 8, 16:00 UTC2h 40m
2026-07-08 FFT9474 MCO → STL Jul 8, 10:15 UTCJul 8, 12:10 UTC1h 55m
2026-07-08 FFT2287 ORF → MCO Jul 8, 02:41 UTCJul 8, 03:51 UTC1h 10m
2026-07-07 FFT2288 MCO → ORF Jul 7, 23:55 UTCJul 8, 01:20 UTC1h 25m
2026-07-07 FFT2288 MCO → ORF Jul 7, 23:43 UTCJul 8, 01:14 UTC1h 31m
2026-07-07 FFT3916 - Jul 7, 19:45 UTCJul 7, 21:50 UTC2h 5m
2026-07-07 FFT2715 - Jul 7, 15:45 UTCJul 7, 17:50 UTC2h 5m
2026-07-07 FFT2338 - Jul 7, 12:05 UTCJul 7, 14:40 UTC2h 35m
2026-07-07 FFT2338 CLE → RSW Jul 7, 12:05 UTCJul 7, 14:34 UTC2h 29m
2026-07-07 FFT4036 - Jul 7, 00:05 UTCJul 7, 01:20 UTC1h 15m
2026-07-06 FFT2409 - Jul 6, 20:05 UTCJul 6, 21:30 UTC1h 25m
2026-07-06 FFT2715 RSW → CLE Jul 6, 15:45 UTCJul 6, 17:55 UTC2h 10m
2026-07-06 FFT2338 - Jul 6, 12:10 UTCJul 6, 14:20 UTC2h 10m
2026-07-06 FFT2338 CLE → RSW Jul 6, 12:05 UTCJul 6, 14:21 UTC2h 16m
2026-07-06 FFT3735 - Jul 6, 00:20 UTCJul 6, 02:45 UTC2h 25m
2026-07-05 FFT3452 PHX → MDW Jul 5, 20:30 UTCJul 5, 22:55 UTC2h 25m
2026-07-05 FFT3452 PHX → MDW Jul 5, 20:15 UTCJul 5, 22:54 UTC2h 39m
2026-07-05 FFT2715 - Jul 5, 15:45 UTCJul 5, 17:55 UTC2h 10m
2026-07-05 FFT2715 RSW → CLE Jul 5, 15:48 UTCJul 5, 17:54 UTC2h 6m
2026-07-05 FFT2338 - Jul 5, 12:15 UTCJul 5, 14:30 UTC2h 15m
2026-07-05 FFT4135 MIA → CLE Jul 5, 00:50 UTCJul 5, 03:10 UTC2h 20m
2026-07-05 FFT4135 MIA → CLE Jul 5, 00:45 UTCJul 5, 03:08 UTC2h 23m
2026-07-04 FFT3026 CLE → MIA Jul 4, 20:55 UTCJul 4, 23:30 UTC2h 35m
2026-07-04 FFT3568 - Jul 4, 16:50 UTCJul 4, 18:55 UTC2h 5m
2026-07-04 FFT4895 CLE → DFW Jul 4, 12:50 UTCJul 4, 15:20 UTC2h 30m
2026-07-03 FFT3232 - Jul 3, 21:30 UTCJul 4, 01:05 UTC3h 35m
2026-07-03 FFT3645 - Jul 3, 17:25 UTCJul 3, 19:50 UTC2h 25m

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 N674FR page for operator, model, and routing details .

Mode-S A8EB21 frequently asked

What is Mode-S code A8EB21?
A8EB21 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N674FR.
Where is Mode-S A8EB21 registered?
Mode-S code A8EB21 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 A8EB21 broadcasting right now?
Yes. Mode-S A8EB21 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8EB21, octal 52165441, decimal 11,070,241.
What flights does A8EB21 operate?
Mode-S A8EB21 has broadcast 20 distinct callsigns, including FFT2338, FFT2715, FFT3913, FFT3679, FFT2919.