Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A523AB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N430FR · operated by FRONTIER AIRLINES INC.

Hex
A523AB
Octal
51221653
Decimal
10,822,571
Country
US
Tail
N430FR
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
606
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A523AB.

Country allocation

The ICAO 24-bit address A523AB 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
FFT4420 Frontier Airlines 19 2026-06-09
FFT4419 Frontier Airlines 17 2026-06-08
FFT3980 Frontier Airlines 13 2026-06-03
FFT4726 - 10 2026-06-29
FFT240 - 10 2026-06-08
FFT2250 - 9 2026-07-01
FFT1746 - 9 2026-06-30
FFT4567 - 8 2026-07-18
FFT4462 - 8 2026-07-02
FFT2695 - 8 2026-06-30
FFT241 Frontier Airlines 8 2026-06-07
FFT1500 - 8 2026-07-17
FFT777 Frontier Airlines 7 2026-07-20
FFT4725 - 7 2026-06-29
FFT3302 Frontier Airlines 7 2026-07-17
FFT2981 - 7 2026-07-02
FFT1726 - 7 2026-07-01
FFT1261 - 7 2026-07-17
FFT3306 - 6 2026-06-29
FFT1823 - 6 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FFT2899 DTW → ATL Jul 26, 19:05 UTCJul 26, 20:30 UTC1h 25m
2026-07-26 FFT2898 ATL → DTW Jul 26, 15:40 UTCJul 26, 17:20 UTC1h 40m
2026-07-26 FFT4707 IAD → ATL Jul 26, 12:00 UTCJul 26, 13:15 UTC1h 15m
2026-07-26 FFT3692 ATL → IAD Jul 26, 02:10 UTCJul 26, 03:30 UTC1h 20m
2026-07-25 FFT2052 MSY → ATL Jul 25, 23:30 UTCJul 26, 00:45 UTC1h 15m
2026-07-25 FFT2051 MKE → LAS Jul 25, 21:10 UTCJul 25, 22:30 UTC1h 20m
2026-07-25 FFT2051 MKE → LAS Jul 25, 19:15 UTCJul 25, 19:25 UTC10m
2026-07-25 FFT1846 PHX → DTW Jul 25, 18:00 UTCJul 25, 19:25 UTC1h 25m
2026-07-25 FFT1846 PHX → DTW Jul 25, 17:57 UTCJul 25, 18:59 UTC1h 2m
2026-07-25 FFT4771 ATL → CVG Jul 25, 15:45 UTCJul 25, 16:45 UTC1h 0m
2026-07-25 FFT4707 IAD → ATL Jul 25, 12:10 UTCJul 25, 13:25 UTC1h 15m
2026-07-25 FFT3692 ATL → IAD Jul 25, 02:20 UTCJul 25, 03:40 UTC1h 20m
2026-07-25 FFT3692 ATL → IAD Jul 25, 02:04 UTCJul 25, 03:39 UTC1h 35m
2026-07-24 FFT2972 MSY → ATL Jul 24, 23:15 UTCJul 25, 00:20 UTC1h 5m
2026-07-24 FFT1371 MDW → DFW Jul 24, 20:15 UTCJul 24, 21:20 UTC1h 5m
2026-07-24 FFT1846 PHX → DTW Jul 24, 17:10 UTCJul 24, 18:10 UTC1h 0m
2026-07-24 FFT4771 ATL → CVG Jul 24, 14:35 UTCJul 24, 15:30 UTC55m
2026-07-24 FFT1853 TPA → ATL Jul 24, 11:05 UTCJul 24, 12:15 UTC1h 10m
2026-07-24 FFT1853 TPA → ATL Jul 24, 11:12 UTCJul 24, 12:11 UTC59m
2026-07-23 FFT1036 DTW → TPA Jul 23, 23:15 UTCJul 24, 01:20 UTC2h 5m
2026-07-23 FFT1035 TPA → DTW Jul 23, 19:30 UTCJul 23, 21:55 UTC2h 25m
2026-07-23 FFT1035 TPA → DTW Jul 23, 19:16 UTCJul 23, 21:45 UTC2h 29m
2026-07-23 FFT1537 BWI → TPA Jul 23, 15:50 UTCJul 23, 18:00 UTC2h 10m
2026-07-23 FFT4092 TPA → BWI Jul 23, 12:25 UTCJul 23, 14:40 UTC2h 15m
2026-07-23 FFT3355 ISP → TPA Jul 23, 00:00 UTCJul 23, 02:35 UTC2h 35m
2026-07-22 FFT3324 TPA → ISP Jul 22, 20:20 UTCJul 22, 22:35 UTC2h 15m
2026-07-22 FFT3324 TPA → ISP Jul 22, 20:21 UTCJul 22, 22:34 UTC2h 13m
2026-07-22 FFT2953 IAD → TPA Jul 22, 16:45 UTCJul 22, 18:40 UTC1h 55m
2026-07-22 FFT2953 IAD → TPA Jul 22, 16:41 UTCJul 22, 18:37 UTC1h 56m
2026-07-22 FFT2954 TPA → IAD Jul 22, 13:15 UTCJul 22, 15:05 UTC1h 50m
2026-07-22 FFT2954 TPA → IAD Jul 22, 13:22 UTCJul 22, 15:03 UTC1h 41m
2026-07-22 FFT3371 RDU → TPA Jul 22, 02:45 UTCJul 22, 04:05 UTC1h 20m
2026-07-22 FFT3371 RDU → TPA Jul 22, 02:48 UTCJul 22, 04:00 UTC1h 12m
2026-07-21 FFT3372 TPA → ORF Jul 21, 23:50 UTCJul 22, 01:15 UTC1h 25m
2026-07-21 FFT2912 ATL → TPA Jul 21, 21:20 UTCJul 21, 22:20 UTC1h 0m
2026-07-21 FFT4435 - Jul 21, 18:30 UTCJul 21, 19:40 UTC1h 10m
2026-07-21 FFT1668 MCO → LGA Jul 21, 15:40 UTCJul 21, 17:20 UTC1h 40m
2026-07-21 FFT1668 MCO → LGA Jul 21, 15:15 UTCJul 21, 17:19 UTC2h 4m
2026-07-21 FFT1303 PHL → BNA Jul 21, 11:55 UTCJul 21, 13:45 UTC1h 50m
2026-07-21 FFT1258 LAS → TPA Jul 21, 05:40 UTCJul 21, 10:05 UTC4h 25m
2026-07-21 FFT1196 BUR → LAS Jul 21, 01:20 UTCJul 21, 02:05 UTC45m
2026-07-20 FFT1195 LAS → BUR Jul 20, 23:20 UTCJul 21, 00:05 UTC44m
2026-07-20 FFT2575 SLC → LAS Jul 20, 20:40 UTCJul 20, 21:35 UTC55m
2026-07-20 FFT1268 LAX → SLC Jul 20, 18:05 UTCJul 20, 19:35 UTC1h 30m
2026-07-20 FFT3291 - Jul 20, 16:00 UTCJul 20, 16:40 UTC40m
2026-07-20 FFT777 DEN → LAS Jul 20, 04:45 UTCJul 20, 06:10 UTC1h 25m
2026-07-20 FFT777 DEN → LAS Jul 20, 04:42 UTCJul 20, 06:05 UTC1h 23m
2026-07-20 FFT1247 GRR → DEN Jul 20, 00:50 UTCJul 20, 03:05 UTC2h 15m
2026-07-19 FFT1248 DEN → GRR Jul 19, 21:25 UTCJul 19, 23:45 UTC2h 20m
2026-07-19 FFT2908 ONT → DEN Jul 19, 18:00 UTCJul 19, 19:55 UTC1h 55m

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 N430FR page for operator, model, and routing details .

Mode-S A523AB frequently asked

What is Mode-S code A523AB?
A523AB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N430FR.
Where is Mode-S A523AB registered?
Mode-S code A523AB 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 A523AB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A523AB, octal 51221653, decimal 10,822,571.
What flights does A523AB operate?
Mode-S A523AB has broadcast 20 distinct callsigns, including FFT4420, FFT4419, FFT3980, FFT4726, FFT240.