Apparatus

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sensors Mode-S transponder

A76F6D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N57869 · BOEING 757-300 · operated by UNITED AIRLINES INC

Hex
A76F6D
Octal
51667555
Decimal
10,973,037
Country
US
Tail
N57869
Type
B753
No current signal · last broadcast Jul 26, 20:05 UTC
Flights observed
271
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:05 UTC

Last known position

Most recent position reported by Mode-S A76F6D.

Country allocation

The ICAO 24-bit address A76F6D 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
UAL1323 United Airlines 16 2026-04-17
UAL2276 United Airlines 15 2026-05-21
UAL2268 - 12 2026-07-08
UAL1431 - 12 2026-07-12
UAL1176 - 12 2026-07-11
UAL1116 United Airlines 11 2026-07-22
UAL638 - 10 2026-07-11
UAL2282 - 9 2026-06-26
UAL1221 - 9 2026-07-13
UAL1495 United Airlines 8 2026-07-26
UAL2348 - 7 2026-07-11
UAL1636 United Airlines 7 2026-07-21
UAL2499 United Airlines 6 2026-05-14
UAL2056 United Airlines 6 2026-05-13
UAL1224 - 6 2026-07-20
UAL576 United Airlines 5 2026-05-15
UAL1946 United Airlines 5 2026-05-15
UAL1509 - 5 2026-07-01
UAL501 - 4 2026-07-04
UAL373 United Airlines 4 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL3750 CLE → IAH Jul 26, 16:25 UTCJul 26, 20:05 UTC3h 40m
2026-07-26 UAL1495 DFW → DEN Jul 26, 02:15 UTCJul 26, 06:05 UTC3h 50m
2026-07-25 UAL457 BWI → SFO Jul 25, 20:05 UTCJul 25, 23:45 UTC3h 40m
2026-07-25 UAL2814 EWR → IAH Jul 25, 14:35 UTCJul 25, 18:05 UTC3h 30m
2026-07-24 UAL1777 EWR → IAH Jul 24, 22:30 UTCJul 25, 02:05 UTC3h 35m
2026-07-24 UAL543 IAH → MCO Jul 24, 16:20 UTCJul 24, 20:30 UTC4h 10m
2026-07-23 UAL1777 EWR → IAH Jul 23, 22:10 UTCJul 24, 01:45 UTC3h 35m
2026-07-23 UAL543 IAH → MCO Jul 23, 16:35 UTCJul 23, 20:15 UTC3h 40m
2026-07-23 UAL2278 ORD → SEA Jul 23, 08:40 UTCJul 23, 12:05 UTC3h 25m
2026-07-23 UAL1495 DFW → DEN Jul 23, 02:20 UTCJul 23, 06:20 UTC4h 0m
2026-07-22 UAL2317 EWR → AUS Jul 22, 19:20 UTCJul 22, 23:30 UTC4h 10m
2026-07-22 UAL1116 BOS → ORD Jul 22, 13:03 UTCJul 22, 16:44 UTC3h 41m
2026-07-22 UAL1116 BOS → ORD Jul 22, 12:55 UTCJul 22, 16:50 UTC3h 55m
2026-07-22 UAL1375 JAX → EWR Jul 22, 04:05 UTCJul 22, 05:25 UTC1h 20m
2026-07-21 UAL1577 RNO → SFO Jul 21, 20:15 UTCJul 22, 00:15 UTC4h 0m
2026-07-21 UAL1941 IAD → EWR Jul 21, 14:25 UTCJul 21, 18:00 UTC3h 35m
2026-07-21 UAL1636 LAX → SFO Jul 21, 06:30 UTCJul 21, 07:10 UTC40m
2026-07-20 UAL1224 - Jul 20, 23:15 UTCJul 20, 23:40 UTC25m
2026-07-20 UAL1224 - Jul 20, 18:40 UTCJul 20, 19:05 UTC25m
2026-07-20 UAL1636 LAX → SFO Jul 20, 05:30 UTCJul 20, 06:35 UTC1h 5m
2026-07-20 UAL1636 LAX → SFO Jul 20, 01:40 UTCJul 20, 01:55 UTC15m
2026-07-20 UAL1636 LAX → SFO Jul 20, 01:38 UTCJul 20, 06:33 UTC4h 55m
2026-07-19 UAL1224 - Jul 19, 23:45 UTCJul 19, 23:55 UTC10m
2026-07-19 UAL1224 - Jul 19, 18:45 UTCJul 19, 19:15 UTC30m
2026-07-15 UAL1636 - Jul 15, 05:55 UTCJul 15, 06:40 UTC45m
2026-07-15 UAL1636 - Jul 15, 01:40 UTCJul 15, 01:55 UTC15m
2026-07-15 UAL1636 HNL → LAX Jul 15, 01:33 UTCJul 15, 06:31 UTC4h 58m
2026-07-14 UAL1224 - Jul 14, 23:30 UTCJul 14, 23:55 UTC25m
2026-07-14 UAL1224 - Jul 14, 18:35 UTCJul 14, 19:05 UTC30m
2026-07-13 UAL1221 - Jul 13, 21:30 UTCJul 13, 22:15 UTC45m
2026-07-13 UAL1221 - Jul 13, 17:20 UTCJul 13, 17:35 UTC15m
2026-07-12 UAL1431 LAX → HNL Jul 12, 20:54 UTCJul 13, 02:08 UTC5h 14m
2026-07-12 UAL1431 - Jul 12, 20:55 UTCJul 13, 01:55 UTC5h 0m
2026-07-12 UAL1868 - Jul 12, 13:55 UTCJul 12, 18:25 UTC4h 30m
2026-07-11 UAL347 DEN → IAD Jul 11, 20:00 UTCJul 11, 23:05 UTC3h 5m
2026-07-11 UAL2348 SFO → DEN Jul 11, 16:00 UTCJul 11, 18:10 UTC2h 10m
2026-07-11 UAL1176 - Jul 11, 13:15 UTCJul 11, 13:50 UTC35m
2026-07-11 UAL1176 - Jul 11, 09:20 UTCJul 11, 09:40 UTC20m
2026-07-11 UAL638 - Jul 11, 07:10 UTCJul 11, 07:30 UTC20m
2026-07-11 UAL638 SFO → HNL Jul 11, 02:53 UTCJul 11, 08:01 UTC5h 8m
2026-07-10 UAL2633 DEN → SFO Jul 10, 22:35 UTCJul 11, 01:15 UTC2h 40m
2026-07-10 UAL1604 SFO → DEN Jul 10, 18:35 UTCJul 10, 20:30 UTC1h 55m
2026-07-10 UAL2391 - Jul 10, 14:45 UTCJul 10, 16:55 UTC2h 10m
2026-07-09 UAL599 IAD → DEN Jul 9, 22:15 UTCJul 10, 02:15 UTC4h 0m
2026-07-09 UAL2087 DEN → IAD Jul 9, 16:35 UTCJul 9, 19:55 UTC3h 20m
2026-07-08 UAL599 IAD → DEN Jul 8, 22:15 UTCJul 9, 01:50 UTC3h 35m
2026-07-08 UAL2268 - Jul 8, 15:35 UTCJul 8, 20:00 UTC4h 25m
2026-07-08 UAL1719 - Jul 8, 12:35 UTCJul 8, 13:15 UTC40m
2026-07-08 UAL1719 - Jul 8, 08:25 UTCJul 8, 08:35 UTC10m
2026-07-08 UAL1718 - Jul 8, 05:20 UTCJul 8, 05:40 UTC20m

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 N57869 page for operator, model, and routing details .

Mode-S A76F6D frequently asked

What is Mode-S code A76F6D?
A76F6D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N57869.
Where is Mode-S A76F6D registered?
Mode-S code A76F6D 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 A76F6D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A76F6D, octal 51667555, decimal 10,973,037.
What flights does A76F6D operate?
Mode-S A76F6D has broadcast 20 distinct callsigns, including UAL1323, UAL2276, UAL2268, UAL1431, UAL1176.