Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 FFT1450 · 37,000 ft
Flights observed
460
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

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
2026-07-26 FFT2698 PHX → CLE Jul 26, 19:40 UTCJul 26, 22:15 UTC2h 35m
2026-07-26 FFT4048 LAS → PHX Jul 26, 17:10 UTCJul 26, 18:00 UTC50m
2026-07-26 FFT1019 PHX → LAS Jul 26, 14:45 UTCJul 26, 15:25 UTC40m
2026-07-26 FFT4655 DFW → PHX Jul 26, 04:05 UTCJul 26, 06:05 UTC2h 0m
2026-07-26 FFT3972 PHX → DFW Jul 26, 00:35 UTCJul 26, 02:45 UTC2h 10m
2026-07-25 FFT1062 MCO → CVG Jul 25, 21:50 UTCJul 25, 22:55 UTC1h 5m
2026-07-25 FFT3303 PHX → LAX Jul 25, 19:20 UTCJul 25, 20:15 UTC55m
2026-07-25 FFT3303 PHX → LAX Jul 25, 19:11 UTCJul 25, 20:12 UTC1h 1m
2026-07-25 FFT1085 MCO → PHX Jul 25, 14:05 UTCJul 25, 17:50 UTC3h 45m
2026-07-25 FFT4146 LAX → MCO Jul 25, 07:45 UTCJul 25, 12:10 UTC4h 25m
2026-07-25 FFT2858 SFO → LAX Jul 25, 05:00 UTCJul 25, 06:05 UTC1h 5m
2026-07-24 FFT1447 ATL → SFO Jul 24, 23:10 UTCJul 25, 03:40 UTC4h 30m
2026-07-24 FFT4731 JFK → ATL Jul 24, 19:10 UTCJul 24, 21:00 UTC1h 50m
2026-07-24 FFT4731 JFK → ATL Jul 24, 18:50 UTCJul 24, 20:58 UTC2h 8m
2026-07-24 FFT4732 ATL → JFK Jul 24, 15:40 UTCJul 24, 17:30 UTC1h 50m
2026-07-24 FFT4873 FLL → ATL Jul 24, 11:35 UTCJul 24, 12:55 UTC1h 20m
2026-07-24 FFT2174 ATL → FLL Jul 24, 06:20 UTCJul 24, 07:40 UTC1h 20m
2026-07-24 FFT2174 ATL → FLL Jul 24, 06:16 UTCJul 24, 07:39 UTC1h 23m
2026-07-24 FFT1079 BWI → ATL Jul 24, 03:30 UTCJul 24, 05:00 UTC1h 30m
2026-07-24 FFT1080 ATL → BWI Jul 24, 00:55 UTCJul 24, 02:30 UTC1h 35m
2026-07-23 FFT1448 SFO → ATL Jul 23, 18:45 UTCJul 23, 23:05 UTC4h 20m
2026-07-23 FFT4593 LAX → SFO Jul 23, 03:00 UTCJul 23, 04:00 UTC1h 0m
2026-07-22 FFT1755 IAH → LAX Jul 22, 21:20 UTCJul 23, 00:10 UTC2h 50m
2026-07-22 FFT2412 ONT → IAH Jul 22, 16:50 UTCJul 22, 19:35 UTC2h 45m
2026-07-22 FFT4689 DFW → ONT Jul 22, 12:40 UTCJul 22, 15:05 UTC2h 25m
2026-07-21 FFT1269 ATL → DFW Jul 21, 22:00 UTCJul 21, 23:45 UTC1h 45m
2026-07-21 FFT1407 BUF → ATL Jul 21, 18:35 UTCJul 21, 20:30 UTC1h 55m
2026-07-21 FFT1408 ATL → BUF Jul 21, 14:00 UTCJul 21, 15:40 UTC1h 40m
2026-07-21 FFT2428 LAS → ATL Jul 21, 08:30 UTCJul 21, 12:15 UTC3h 45m
2026-07-21 FFT2015 CLE → LAS Jul 21, 04:50 UTCJul 21, 06:15 UTC1h 25m
2026-07-21 FFT3725 - Jul 21, 00:50 UTCJul 21, 03:15 UTC2h 25m
2026-07-20 FFT3286 DEN → CVG Jul 20, 21:00 UTCJul 20, 23:10 UTC2h 10m
2026-07-20 FFT4990 SAN → DEN Jul 20, 17:20 UTCJul 20, 19:20 UTC2h 0m
2026-07-20 FFT2421 DEN → SAN Jul 20, 13:55 UTCJul 20, 15:40 UTC1h 45m
2026-07-19 FFT1113 TPA → DEN Jul 19, 17:00 UTCJul 19, 20:10 UTC3h 10m
2026-07-19 FFT2748 DEN → TPA Jul 19, 12:15 UTCJul 19, 15:25 UTC3h 10m
2026-07-18 FFT2443 - Jul 18, 22:05 UTCJul 19, 00:25 UTC2h 20m
2026-07-18 FFT3930 DEN → PNS Jul 18, 17:35 UTCJul 18, 20:15 UTC2h 40m
2026-07-18 FFT1449 ATL → DEN Jul 18, 11:50 UTCJul 18, 14:20 UTC2h 30m
2026-07-18 FFT4702 AUS → ATL Jul 18, 06:50 UTCJul 18, 08:42 UTC1h 52m
2026-07-18 FFT4702 AUS → ATL Jul 18, 06:50 UTCJul 18, 08:40 UTC1h 50m
2026-07-17 FFT4211 ATL → AUS Jul 17, 15:40 UTCJul 17, 17:30 UTC1h 50m
2026-07-17 FFT4707 IAD → ATL Jul 17, 12:15 UTCJul 17, 13:29 UTC1h 15m
2026-07-17 FFT3692 ATL → IAD Jul 17, 02:54 UTCJul 17, 04:10 UTC1h 15m
2026-07-16 FFT1669 CVG → MCO Jul 16, 23:59 UTCJul 17, 01:00 UTC1h 0m
2026-07-16 FFT2178 FLL → RDU Jul 16, 19:05 UTCJul 16, 20:49 UTC1h 45m
2026-07-16 FFT3014 ATL → FLL Jul 16, 16:09 UTCJul 16, 17:35 UTC1h 25m
2026-07-16 FFT4427 - Jul 16, 12:55 UTCJul 16, 14:10 UTC1h 15m
2026-07-16 FFT2510 ATL → BWI Jul 16, 09:45 UTCJul 16, 11:25 UTC1h 40m
2026-07-16 FFT4347 LGA → ATL Jul 16, 04:05 UTCJul 16, 05:40 UTC1h 35m

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.