Apparatus

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sensors Mode-S transponder

A75FDF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N57416 · BOEING 737 MAX 9 · operated by UNITED AIRLINES INC

Hex
A75FDF
Octal
51657737
Decimal
10,969,055
Country
US
Tail
N57416
Type
B39M
No current signal · last broadcast Jul 26, 19:45 UTC
Flights observed
480
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:45 UTC

Last known position

Most recent position reported by Mode-S A75FDF.

Country allocation

The ICAO 24-bit address A75FDF 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
UAL2031 United Airlines 6 2026-04-27
UAL1192 - 6 2026-07-08
UAL701 United Airlines 5 2026-05-07
UAL2131 - 5 2026-07-09
UAL2024 - 5 2026-07-08
UAL693 United Airlines 4 2026-06-07
UAL2379 United Airlines 4 2026-07-18
UAL2219 - 4 2026-07-05
UAL2022 United Airlines 4 2026-05-01
UAL1572 United Airlines 4 2026-06-11
UAL1543 - 4 2026-07-05
UAL1397 - 4 2026-07-04
UAL1249 - 4 2026-07-03
UAL1203 - 4 2026-07-12
UAL723 United Airlines 3 2026-04-16
UAL602 United Airlines 3 2026-04-15
UAL538 United Airlines 3 2026-05-25
UAL468 - 3 2026-06-29
UAL360 - 3 2026-07-13
UAL356 United Airlines 3 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1511 RDM → SFO Jul 26, 17:20 UTCJul 26, 19:45 UTC2h 25m
2026-07-26 UAL1472 SDQ → EWR Jul 26, 10:45 UTCJul 26, 14:05 UTC3h 20m
2026-07-25 UAL1471 EWR → SDQ Jul 25, 23:30 UTCJul 26, 00:20 UTC50m
2026-07-25 UAL1471 EWR → SDQ Jul 25, 23:22 UTCJul 26, 02:50 UTC3h 28m
2026-07-25 UAL2489 SDQ → EWR Jul 25, 12:15 UTCJul 25, 21:05 UTC8h 50m
2026-07-24 UAL1021 EWR → PTY Jul 24, 19:35 UTCJul 25, 08:45 UTC13h 10m
2026-07-24 UAL2858 EWR → MSY Jul 24, 15:10 UTCJul 24, 17:25 UTC2h 15m
2026-07-24 UAL1979 EWR → TPA Jul 24, 11:10 UTCJul 24, 13:25 UTC2h 15m
2026-07-23 UAL1043 AUA → EWR Jul 23, 22:45 UTCJul 24, 02:00 UTC3h 15m
2026-07-23 UAL1043 AUA → EWR Jul 23, 21:55 UTCJul 23, 22:10 UTC15m
2026-07-23 UAL1042 EWR → AUA Jul 23, 20:05 UTCJul 23, 20:20 UTC15m
2026-07-23 UAL1042 EWR → AUA Jul 23, 16:15 UTCJul 23, 17:00 UTC45m
2026-07-23 UAL1797 - Jul 23, 11:15 UTCJul 23, 14:15 UTC3h 0m
2026-07-23 UAL1986 RDM → SFO Jul 23, 02:50 UTCJul 23, 05:15 UTC2h 25m
2026-07-22 UAL1648 AUA → IAD Jul 22, 20:45 UTCJul 23, 00:40 UTC3h 55m
2026-07-22 UAL1804 IAH → AUA Jul 22, 15:05 UTCJul 22, 19:15 UTC4h 10m
2026-07-22 UAL2358 SAN → EWR Jul 22, 11:20 UTCJul 22, 13:15 UTC1h 55m
2026-07-22 UAL465 IAH → PDX Jul 22, 01:15 UTCJul 22, 03:05 UTC1h 50m
2026-07-21 UAL1387 SFO → IAH Jul 21, 19:37 UTCJul 21, 23:18 UTC3h 41m
2026-07-21 UAL1387 - Jul 21, 19:45 UTCJul 21, 23:20 UTC3h 35m
2026-07-21 UAL2855 MCO → SFO Jul 21, 12:40 UTCJul 21, 17:20 UTC4h 40m
2026-07-21 UAL1730 - Jul 21, 06:20 UTCJul 21, 10:50 UTC4h 30m
2026-07-21 UAL1213 EWR → ATL Jul 21, 00:25 UTCJul 21, 04:40 UTC4h 15m
2026-07-20 UAL1621 LAX → MCO Jul 20, 17:55 UTCJul 20, 22:35 UTC4h 40m
2026-07-20 UAL2113 - Jul 20, 11:10 UTCJul 20, 11:45 UTC35m
2026-07-20 UAL2113 EWR → ATL Jul 20, 11:15 UTCJul 20, 15:42 UTC4h 27m
2026-07-19 UAL2451 - Jul 19, 23:40 UTCJul 20, 01:35 UTC1h 55m
2026-07-19 UAL2451 IAH → MCO Jul 19, 23:47 UTCJul 20, 01:34 UTC1h 47m
2026-07-19 UAL2086 - Jul 19, 19:05 UTCJul 19, 22:00 UTC2h 55m
2026-07-19 UAL203 SFO → ABQ Jul 19, 16:50 UTCJul 19, 17:30 UTC40m
2026-07-19 UAL751 - Jul 19, 01:15 UTCJul 19, 02:20 UTC1h 5m
2026-07-19 UAL751 SFO → LAS Jul 19, 01:11 UTCJul 19, 02:19 UTC1h 8m
2026-07-18 UAL2478 LAS → SFO Jul 18, 22:35 UTCJul 18, 23:35 UTC1h 0m
2026-07-18 UAL2449 SJC → IAH Jul 18, 19:25 UTCJul 18, 20:30 UTC1h 5m
2026-07-18 UAL2744 MCO → EWR Jul 18, 13:45 UTCJul 18, 17:05 UTC3h 20m
2026-07-18 UAL2379 ORF → EWR Jul 18, 07:00 UTCJul 18, 10:45 UTC3h 45m
2026-07-18 UAL2456 LAX → EWR Jul 18, 01:15 UTCJul 18, 05:05 UTC3h 51m
2026-07-17 UAL3749 - Jul 17, 21:20 UTCJul 17, 23:10 UTC1h 50m
2026-07-17 UAL3749 JAX → IAH Jul 17, 21:25 UTCJul 17, 23:04 UTC1h 39m
2026-07-17 UAL3739 - Jul 17, 19:00 UTCJul 17, 20:00 UTC1h 0m
2026-07-17 UAL3739 NBW → JAX Jul 17, 18:15 UTCJul 17, 20:00 UTC1h 45m
2026-07-17 UAL3738 - Jul 17, 13:45 UTCJul 17, 14:35 UTC50m
2026-07-17 UAL3738 NIP → NBW Jul 17, 13:43 UTCJul 17, 15:27 UTC1h 44m
2026-07-17 UAL3748 - Jul 17, 10:25 UTCJul 17, 12:04 UTC1h 40m
2026-07-17 UAL3748 IAH → NIP Jul 17, 10:36 UTCJul 17, 12:00 UTC1h 24m
2026-07-16 UAL2782 - Jul 16, 22:19 UTCJul 17, 01:15 UTC2h 55m
2026-07-16 UAL1825 DFW → EWR Jul 16, 16:09 UTCJul 16, 18:59 UTC2h 50m
2026-07-16 UAL1712 EWR → DFW Jul 16, 10:50 UTCJul 16, 13:49 UTC3h 0m
2026-07-15 UAL2100 - Jul 15, 22:40 UTCJul 16, 03:30 UTC4h 50m
2026-07-15 UAL1289 - Jul 15, 15:25 UTCJul 15, 20:30 UTC5h 5m

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 N57416 page for operator, model, and routing details .

Mode-S A75FDF frequently asked

What is Mode-S code A75FDF?
A75FDF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N57416.
Where is Mode-S A75FDF registered?
Mode-S code A75FDF 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 A75FDF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A75FDF, octal 51657737, decimal 10,969,055.
What flights does A75FDF operate?
Mode-S A75FDF has broadcast 20 distinct callsigns, including UAL2031, UAL1192, UAL701, UAL2131, UAL2024.