Apparatus

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sensors Mode-S transponder

A7EF4B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N610FR · AIRBUS A-321neo · operated by BANK OF UTAH TRUSTEE

Hex
A7EF4B
Octal
51767513
Decimal
11,005,771
Country
US
Tail
N610FR
Type
A21N
No current signal · last broadcast 4h ago
Flights observed
409
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A7EF4B.

Country allocation

The ICAO 24-bit address A7EF4B 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
FFT4639 - 6 2026-07-12
FFT1280 - 6 2026-07-13
FFT317 - 5 2026-07-07
FFT2445 Frontier Airlines 5 2026-04-24
FFT70 Frontier Airlines 4 2026-07-07
FFT67 - 4 2026-07-13
FFT66 Frontier Airlines 4 2026-06-15
FFT3599 Frontier Airlines 4 2026-04-18
FFT3227 - 4 2026-07-08
FFT2940 - 4 2026-07-13
FFT2446 Frontier Airlines 4 2026-04-24
FFT2266 - 4 2026-06-24
FFT1965 Frontier Airlines 4 2026-06-10
FFT1918 - 4 2026-07-12
FFT1665 - 4 2026-07-13
FFT86 Frontier Airlines 3 2026-04-17
FFT4797 - 3 2026-06-29
FFT4712 Frontier Airlines 3 2026-04-22
FFT4578 Frontier Airlines 3 2026-06-05
FFT45 Frontier Airlines 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 FFT1665 - Jul 13, 23:35 UTCJul 14, 01:35 UTC2h 0m
2026-07-13 FFT2940 - Jul 13, 20:00 UTCJul 13, 22:05 UTC2h 5m
2026-07-13 FFT67 - Jul 13, 12:15 UTCJul 13, 18:30 UTC6h 15m
2026-07-13 FFT1280 - Jul 13, 06:30 UTCJul 13, 09:50 UTC3h 20m
2026-07-13 FFT2443 - Jul 13, 00:25 UTCJul 13, 03:01 UTC2h 35m
2026-07-12 FFT3930 - Jul 12, 20:45 UTCJul 12, 23:05 UTC2h 20m
2026-07-12 FFT4639 - Jul 12, 16:10 UTCJul 12, 18:35 UTC2h 25m
2026-07-12 FFT1918 DEN → CLE Jul 12, 12:05 UTCJul 12, 14:40 UTC2h 35m
2026-07-11 FFT4069 - Jul 11, 05:40 UTCJul 11, 07:20 UTC1h 40m
2026-07-11 FFT4069 DFW → DEN Jul 11, 05:47 UTCJul 11, 07:18 UTC1h 31m
2026-07-11 FFT2148 DEN → DFW Jul 11, 03:01 UTCJul 11, 04:25 UTC1h 25m
2026-07-10 FFT71 CUN → DEN Jul 10, 20:55 UTCJul 11, 00:45 UTC3h 50m
2026-07-10 FFT316 - Jul 10, 17:25 UTCJul 10, 19:20 UTC1h 55m
2026-07-10 FFT3206 - Jul 10, 13:10 UTCJul 10, 15:05 UTC1h 55m
2026-07-08 FFT3227 - Jul 8, 00:20 UTCJul 8, 02:35 UTC2h 15m
2026-07-07 FFT317 - Jul 7, 20:30 UTCJul 7, 21:05 UTC35m
2026-07-07 FFT317 - Jul 7, 19:10 UTCJul 7, 19:45 UTC35m
2026-07-07 FFT70 DEN → CUN Jul 7, 13:50 UTCJul 7, 17:25 UTC3h 35m
2026-07-06 FFT2350 LAS → DEN Jul 6, 13:15 UTCJul 6, 14:40 UTC1h 25m
2026-07-06 FFT2350 LAS → DEN Jul 6, 13:13 UTCJul 6, 14:37 UTC1h 24m
2026-07-06 FFT3885 DFW → LAS Jul 6, 05:50 UTCJul 6, 08:05 UTC2h 15m
2026-07-05 FFT3989 - Jul 5, 23:55 UTCJul 6, 02:15 UTC2h 20m
2026-07-05 FFT3990 SAN → DFW Jul 5, 19:40 UTCJul 5, 21:45 UTC2h 5m
2026-07-05 FFT3366 DEN → DFW Jul 5, 16:25 UTCJul 5, 17:55 UTC1h 30m
2026-07-05 FFT3227 IAH → DEN Jul 5, 01:00 UTCJul 5, 03:00 UTC2h 0m
2026-07-03 FFT317 - Jul 3, 19:50 UTCJul 3, 21:40 UTC1h 50m
2026-07-03 FFT70 DEN → CUN Jul 3, 13:55 UTCJul 3, 17:35 UTC3h 40m
2026-07-03 FFT3227 IAH → DEN Jul 3, 00:00 UTCJul 3, 02:05 UTC2h 5m
2026-07-02 FFT317 - Jul 2, 19:10 UTCJul 2, 21:05 UTC1h 55m
2026-07-02 FFT317 CUN → IAH Jul 2, 19:13 UTCJul 2, 20:55 UTC1h 42m
2026-07-02 FFT70 DEN → CUN Jul 2, 14:00 UTCJul 2, 17:25 UTC3h 25m
2026-07-01 FFT9410 CVG → TPA Jul 1, 18:50 UTCJul 1, 20:50 UTC2h 0m
2026-06-29 FFT1447 - Jun 29, 22:49 UTCJun 30, 03:15 UTC4h 25m
2026-06-29 FFT4731 JFK → ATL Jun 29, 17:19 UTCJun 29, 19:00 UTC1h 40m
2026-06-29 FFT4732 ATL → JFK Jun 29, 13:30 UTCJun 29, 15:24 UTC1h 55m
2026-06-29 FFT4732 ATL → JFK Jun 29, 13:34 UTCJun 29, 15:23 UTC1h 49m
2026-06-29 FFT4797 - Jun 29, 10:34 UTCJun 29, 11:25 UTC50m
2026-06-29 FFT1670 ATL → RDU Jun 29, 04:04 UTCJun 29, 05:00 UTC55m
2026-06-28 FFT4702 - Jun 28, 23:29 UTCJun 29, 01:20 UTC1h 50m
2026-06-28 FFT4211 ATL → AUS Jun 28, 19:40 UTCJun 28, 21:30 UTC1h 50m
2026-06-27 FFT4797 - Jun 27, 10:34 UTCJun 27, 11:25 UTC50m
2026-06-27 FFT4797 RDU → ATL Jun 27, 10:29 UTCJun 27, 11:24 UTC55m
2026-06-27 FFT3330 DFW → RDU Jun 27, 01:04 UTCJun 27, 03:20 UTC2h 15m
2026-06-27 FFT3330 DFW → RDU Jun 27, 00:55 UTCJun 27, 03:16 UTC2h 21m
2026-06-26 FFT1481 MCO → DFW Jun 26, 21:43 UTCJun 26, 23:39 UTC1h 56m
2026-06-26 FFT1481 - Jun 26, 21:20 UTCJun 26, 21:24 UTC5m
2026-06-26 FFT2769 - Jun 26, 17:00 UTCJun 26, 19:24 UTC2h 25m
2026-06-26 FFT1684 MCO → BDL Jun 26, 13:10 UTCJun 26, 15:29 UTC2h 20m
2026-06-26 FFT2615 LGA → MCO Jun 26, 00:50 UTCJun 26, 02:54 UTC2h 5m
2026-06-26 FFT2615 LGA → MCO Jun 26, 00:48 UTCJun 26, 02:52 UTC2h 4m

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 N610FR page for operator, model, and routing details .

Mode-S A7EF4B frequently asked

What is Mode-S code A7EF4B?
A7EF4B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N610FR.
Where is Mode-S A7EF4B registered?
Mode-S code A7EF4B 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 A7EF4B 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 A7EF4B, octal 51767513, decimal 11,005,771.
What flights does A7EF4B operate?
Mode-S A7EF4B has broadcast 20 distinct callsigns, including FFT4639, FFT1280, FFT317, FFT2445, FFT70.