Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A75FBF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N57409 · operated by BOEING CO

Hex
A75FBF
Octal
51657677
Decimal
10,969,023
Country
US
Tail
N57409
Transponder active on ground
Flights observed
500
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:05 UTC

Last known position

Most recent position reported by Mode-S A75FBF.

Country allocation

The ICAO 24-bit address A75FBF 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
UAL701 - 7 2026-07-04
UAL2372 United Airlines 7 2026-05-30
UAL1043 - 6 2026-07-07
UAL796 United Airlines 5 2026-04-23
UAL693 - 5 2026-06-22
UAL637 United Airlines 5 2026-04-28
UAL2373 United Airlines 5 2026-05-29
UAL1742 - 5 2026-06-19
UAL1644 - 5 2026-07-03
UAL1643 United Airlines 5 2026-05-17
UAL1543 United Airlines 5 2026-05-16
UAL1074 - 5 2026-06-23
UAL1042 United Airlines 5 2026-07-26
UAL727 United Airlines 4 2026-07-24
UAL694 United Airlines 4 2026-06-21
UAL497 United Airlines 4 2026-06-07
UAL326 - 4 2026-07-09
UAL2495 - 4 2026-07-05
UAL2219 United Airlines 4 2026-05-16
UAL1797 United Airlines 4 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1042 EWR → AUA Jul 26, 19:45 UTCJul 26, 20:05 UTC20m
2026-07-26 UAL1042 EWR → AUA Jul 26, 16:05 UTCJul 26, 19:15 UTC3h 10m
2026-07-26 UAL1797 RDU → EWR Jul 26, 11:10 UTCJul 26, 14:20 UTC3h 10m
2026-07-25 UAL1284 EWR → SLC Jul 25, 20:29 UTCJul 26, 00:26 UTC3h 57m
2026-07-25 UAL1284 EWR → SLC Jul 25, 15:10 UTCJul 26, 00:30 UTC9h 20m
2026-07-25 UAL1105 EWR → MCO Jul 25, 10:55 UTCJul 25, 13:05 UTC2h 10m
2026-07-25 UAL1190 MCO → EWR Jul 25, 01:05 UTCJul 25, 03:10 UTC2h 5m
2026-07-24 UAL727 PTY → EWR Jul 24, 16:24 UTCJul 24, 20:54 UTC4h 30m
2026-07-24 UAL727 PTY → EWR Jul 24, 16:24 UTCJul 24, 20:55 UTC4h 31m
2026-07-23 UAL1021 EWR → PTY Jul 23, 23:10 UTCJul 24, 02:45 UTC3h 35m
2026-07-23 UAL727 PTY → EWR Jul 23, 15:55 UTCJul 23, 19:35 UTC3h 40m
2026-07-22 UAL727 PTY → EWR Jul 22, 21:50 UTCJul 23, 19:35 UTC21h 45m
2026-07-22 UAL1034 - Jul 22, 20:00 UTCJul 22, 22:50 UTC2h 50m
2026-07-22 UAL1034 IAH → PTY Jul 22, 19:55 UTCJul 22, 23:14 UTC3h 19m
2026-07-22 UAL1181 MIA → EWR Jul 22, 15:10 UTCJul 22, 17:45 UTC2h 35m
2026-07-22 UAL2406 LAX → SFO Jul 22, 01:55 UTCJul 22, 04:35 UTC2h 40m
2026-07-21 UAL2095 ORD → LAX Jul 21, 20:05 UTCJul 21, 23:10 UTC3h 5m
2026-07-21 UAL2653 RSW → EWR Jul 21, 16:25 UTCJul 21, 18:05 UTC1h 40m
2026-07-21 UAL2804 TPA → ORD Jul 21, 12:05 UTCJul 21, 14:45 UTC2h 40m
2026-07-21 UAL2865 DEN → ORD Jul 21, 02:30 UTCJul 21, 04:30 UTC2h 0m
2026-07-21 UAL2865 DEN → ORD Jul 21, 02:18 UTCJul 21, 04:29 UTC2h 11m
2026-07-20 UAL2040 BOS → ORD Jul 20, 21:20 UTCJul 20, 23:50 UTC2h 30m
2026-07-20 UAL1015 EWR → MIA Jul 20, 14:15 UTCJul 20, 19:55 UTC5h 40m
2026-07-20 UAL1947 LGA → IAH Jul 20, 05:55 UTCJul 20, 06:45 UTC50m
2026-07-20 UAL1947 LGA → IAH Jul 20, 02:00 UTCJul 20, 02:10 UTC10m
2026-07-20 UAL1260 SNA → SFO Jul 20, 00:10 UTCJul 20, 00:25 UTC15m
2026-07-19 UAL1260 SNA → SFO Jul 19, 19:25 UTCJul 19, 20:05 UTC40m
2026-07-19 UAL1260 SNA → SFO Jul 19, 19:22 UTCJul 20, 00:23 UTC5h 1m
2026-07-19 UAL2744 MCO → EWR Jul 19, 13:30 UTCJul 19, 16:55 UTC3h 25m
2026-07-19 UAL491 BZN → DEN Jul 19, 08:25 UTCJul 19, 11:20 UTC2h 55m
2026-07-19 UAL639 DEN → MSO Jul 19, 00:15 UTCJul 19, 05:35 UTC5h 20m
2026-07-18 UAL1783 - Jul 18, 17:15 UTCJul 18, 22:15 UTC5h 0m
2026-07-18 UAL1006 - Jul 18, 14:20 UTCJul 18, 14:45 UTC25m
2026-07-18 UAL1006 SAN → LAX Jul 18, 13:52 UTCJul 18, 14:37 UTC45m
2026-07-18 UAL2407 TPA → EWR Jul 18, 01:34 UTCJul 18, 04:15 UTC2h 41m
2026-07-17 UAL1284 EWR → SLC Jul 17, 15:00 UTCJul 18, 00:00 UTC9h 0m
2026-07-17 UAL570 BOS → EWR Jul 17, 12:10 UTCJul 17, 12:55 UTC45m
2026-07-17 UAL1032 SAN → EWR Jul 17, 01:35 UTCJul 17, 03:20 UTC1h 45m
2026-07-16 UAL1650 - Jul 16, 18:50 UTCJul 16, 23:05 UTC4h 15m
2026-07-16 UAL1650 - Jul 16, 18:05 UTCJul 16, 18:19 UTC15m
2026-07-16 UAL1203 - Jul 16, 16:40 UTCJul 16, 16:55 UTC15m
2026-07-16 UAL1203 - Jul 16, 13:10 UTCJul 16, 16:05 UTC2h 55m
2026-07-15 UAL2024 - Jul 15, 23:50 UTCJul 16, 00:45 UTC55m
2026-07-15 UAL2024 - Jul 15, 21:20 UTCJul 15, 21:30 UTC10m
2026-07-15 UAL2024 SJU → IAD Jul 15, 21:19 UTCJul 16, 00:40 UTC3h 21m
2026-07-15 UAL1192 - Jul 15, 19:25 UTCJul 15, 19:35 UTC10m
2026-07-15 UAL1192 - Jul 15, 15:35 UTCJul 15, 17:50 UTC2h 15m
2026-07-15 UAL584 - Jul 15, 10:25 UTCJul 15, 13:10 UTC2h 45m
2026-07-14 UAL1663 - Jul 14, 23:35 UTCJul 15, 03:00 UTC3h 25m
2026-07-14 UAL1036 - Jul 14, 18:55 UTCJul 14, 21:20 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 N57409 page for operator, model, and routing details .

Mode-S A75FBF frequently asked

What is Mode-S code A75FBF?
A75FBF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N57409.
Where is Mode-S A75FBF registered?
Mode-S code A75FBF 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 A75FBF broadcasting right now?
Mode-S A75FBF is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A75FBF, octal 51657677, decimal 10,969,023.
What flights does A75FBF operate?
Mode-S A75FBF has broadcast 20 distinct callsigns, including UAL701, UAL2372, UAL1043, UAL796, UAL693.