Apparatus

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sensors Mode-S transponder

A76F6C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N57868 · BOEING 757-300 · operated by UNITED AIRLINES INC

Hex
A76F6C
Octal
51667554
Decimal
10,973,036
Country
US
Tail
N57868
Type
B753
No current signal · last broadcast Jul 25, 02:50 UTC
Flights observed
280
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 02:50 UTC

Last known position

Most recent position reported by Mode-S A76F6C.

Country allocation

The ICAO 24-bit address A76F6C 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
UAL1431 - 9 2026-07-14
UAL1176 United Airlines 9 2026-07-23
UAL1722 United Airlines 8 2026-07-20
UAL1721 - 8 2026-07-20
UAL1509 United Airlines 8 2026-07-23
UAL1495 - 8 2026-06-21
UAL1636 - 7 2026-07-04
UAL1221 United Airlines 7 2026-07-23
UAL635 United Airlines 6 2026-06-08
UAL373 - 6 2026-07-15
UAL2767 - 6 2026-07-09
UAL2348 - 6 2026-07-16
UAL1967 - 6 2026-07-21
UAL1129 United Airlines 6 2026-07-09
UAL2317 - 5 2026-06-20
UAL2276 United Airlines 5 2026-07-24
UAL2268 United Airlines 5 2026-07-24
UAL1954 United Airlines 5 2026-07-21
UAL1575 - 5 2026-07-10
UAL1022 - 5 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 UAL2276 IAD → LAX Jul 24, 22:25 UTCJul 25, 02:50 UTC4h 25m
2026-07-24 UAL2268 IAD → MCO Jul 24, 15:45 UTCJul 24, 20:10 UTC4h 25m
2026-07-24 UAL1719 ORD → SFO Jul 24, 08:28 UTCJul 24, 12:43 UTC4h 15m
2026-07-24 UAL1719 ORD → SFO Jul 24, 08:10 UTCJul 24, 08:20 UTC10m
2026-07-24 UAL1718 LAS → LAX Jul 24, 05:25 UTCJul 24, 05:35 UTC10m
2026-07-24 UAL1718 LAS → LAX Jul 24, 00:25 UTCJul 24, 00:50 UTC25m
2026-07-23 UAL1221 PDX → EWR Jul 23, 21:55 UTCJul 23, 22:35 UTC40m
2026-07-23 UAL1221 PDX → EWR Jul 23, 18:00 UTCJul 23, 18:15 UTC15m
2026-07-23 UAL1176 SJC → ORD Jul 23, 09:50 UTCJul 23, 10:35 UTC45m
2026-07-23 UAL1509 SFO → HNL Jul 23, 02:40 UTCJul 23, 07:50 UTC5h 10m
2026-07-22 UAL1577 RNO → SFO Jul 22, 20:33 UTCJul 23, 00:42 UTC4h 9m
2026-07-22 UAL1577 RNO → SFO Jul 22, 20:30 UTCJul 23, 01:00 UTC4h 30m
2026-07-22 UAL1941 IAD → EWR Jul 22, 14:20 UTCJul 22, 17:55 UTC3h 35m
2026-07-21 UAL1967 - Jul 21, 23:40 UTCJul 22, 03:20 UTC3h 40m
2026-07-21 UAL1954 RDM → SFO Jul 21, 17:25 UTCJul 21, 21:05 UTC3h 40m
2026-07-21 UAL246 ORD → LGA Jul 21, 11:35 UTCJul 21, 15:30 UTC3h 55m
2026-07-21 UAL8260 SBA → DEN Jul 21, 06:00 UTCJul 21, 09:40 UTC3h 40m
2026-07-20 UAL1722 OGG → SFO Jul 20, 22:52 UTCJul 21, 03:30 UTC4h 38m
2026-07-20 UAL1722 OGG → SFO Jul 20, 22:45 UTCJul 20, 23:05 UTC20m
2026-07-20 UAL1721 - Jul 20, 20:25 UTCJul 20, 20:35 UTC10m
2026-07-20 UAL1721 - Jul 20, 15:40 UTCJul 20, 16:20 UTC40m
2026-07-20 UAL1176 SJC → ORD Jul 20, 09:20 UTCJul 20, 09:35 UTC15m
2026-07-20 UAL1176 SJC → ORD Jul 20, 09:17 UTCJul 20, 13:56 UTC4h 39m
2026-07-20 UAL638 MCO → ORD Jul 20, 07:15 UTCJul 20, 07:35 UTC20m
2026-07-20 UAL638 MCO → ORD Jul 20, 02:25 UTCJul 20, 03:05 UTC40m
2026-07-19 UAL2633 DEN → SFO Jul 19, 22:16 UTCJul 20, 00:27 UTC2h 11m
2026-07-19 UAL2633 DEN → SFO Jul 19, 22:25 UTCJul 20, 00:30 UTC2h 5m
2026-07-19 UAL8204 ORD → SAT Jul 19, 18:15 UTCJul 19, 20:15 UTC2h 0m
2026-07-19 UAL2391 ORD → EWR Jul 19, 13:55 UTCJul 19, 16:10 UTC2h 15m
2026-07-18 UAL599 DEN → EWR Jul 18, 23:05 UTCJul 19, 02:10 UTC3h 5m
2026-07-18 UAL2087 - Jul 18, 17:35 UTCJul 18, 21:30 UTC3h 55m
2026-07-17 UAL1654 - Jul 17, 23:30 UTCJul 18, 01:30 UTC2h 0m
2026-07-17 UAL8129 - Jul 17, 19:55 UTCJul 17, 21:50 UTC1h 55m
2026-07-17 UAL1022 MCO → DEN Jul 17, 14:20 UTCJul 17, 17:40 UTC3h 20m
2026-07-17 UAL1022 MCO → DEN Jul 17, 14:20 UTCJul 17, 17:37 UTC3h 17m
2026-07-16 UAL501 DEN → MCO Jul 16, 20:25 UTCJul 16, 23:29 UTC3h 5m
2026-07-16 UAL2348 SFO → DEN Jul 16, 16:05 UTCJul 16, 18:15 UTC2h 10m
2026-07-16 UAL1176 - Jul 16, 12:44 UTCJul 16, 13:45 UTC1h 0m
2026-07-16 UAL1176 - Jul 16, 09:10 UTCJul 16, 09:25 UTC15m
2026-07-16 UAL1509 SFO → HNL Jul 16, 00:26 UTCJul 16, 05:23 UTC4h 57m
2026-07-16 UAL1509 - Jul 16, 00:30 UTCJul 16, 05:25 UTC4h 55m
2026-07-15 UAL373 - Jul 15, 21:10 UTCJul 15, 21:55 UTC45m
2026-07-15 UAL373 - Jul 15, 17:25 UTCJul 15, 17:45 UTC20m
2026-07-14 UAL1431 - Jul 14, 20:55 UTCJul 15, 02:00 UTC5h 4m
2026-07-14 UAL1868 - Jul 14, 13:45 UTCJul 14, 18:00 UTC4h 15m
2026-07-13 UAL347 - Jul 13, 20:20 UTCJul 13, 23:20 UTC3h 0m
2026-07-13 UAL2348 SFO → DEN Jul 13, 16:15 UTCJul 13, 18:20 UTC2h 5m
2026-07-13 UAL1176 - Jul 13, 13:20 UTCJul 13, 14:10 UTC50m
2026-07-13 UAL1176 - Jul 13, 09:30 UTCJul 13, 09:45 UTC15m
2026-07-13 UAL1509 - Jul 13, 00:45 UTCJul 13, 05:31 UTC4h 45m

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 N57868 page for operator, model, and routing details .

Mode-S A76F6C frequently asked

What is Mode-S code A76F6C?
A76F6C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N57868.
Where is Mode-S A76F6C registered?
Mode-S code A76F6C 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 A76F6C broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 02:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A76F6C, octal 51667554, decimal 10,973,036.
What flights does A76F6C operate?
Mode-S A76F6C has broadcast 20 distinct callsigns, including UAL1431, UAL1176, UAL1722, UAL1721, UAL1509.