Apparatus

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sensors Mode-S transponder

A76F66

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N57862 · BOEING 757-300 · operated by UNITED AIRLINES INC

Hex
A76F66
Octal
51667546
Decimal
10,973,030
Country
US
Tail
N57862
Type
B753
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
324
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A76F66.

Country allocation

The ICAO 24-bit address A76F66 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
UAL501 - 16 2026-07-18
UAL1721 - 15 2026-07-12
UAL1022 - 15 2026-07-19
UAL1722 - 14 2026-07-13
UAL1116 United Airlines 14 2026-07-25
UAL1495 United Airlines 10 2026-07-25
UAL2814 - 9 2026-07-21
UAL599 United Airlines 8 2026-07-20
UAL2317 United Airlines 8 2026-07-24
UAL2087 - 8 2026-06-23
UAL1962 United Airlines 8 2026-05-13
UAL457 - 7 2026-07-04
UAL2348 United Airlines 7 2026-07-26
UAL635 United Airlines 6 2026-06-11
UAL2278 United Airlines 6 2026-07-25
UAL1654 - 6 2026-06-20
UAL1431 United Airlines 6 2026-07-21
UAL1176 United Airlines 6 2026-07-26
UAL1829 United Airlines 5 2026-06-19
UAL1777 - 5 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL347 PHL → DEN Jul 26, 21:05 UTCJul 26, 21:30 UTC25m
2026-07-26 UAL2348 IAH → LGA Jul 26, 16:25 UTCJul 26, 18:25 UTC2h 0m
2026-07-26 UAL1176 SJC → ORD Jul 26, 13:05 UTCJul 26, 13:50 UTC45m
2026-07-26 UAL1176 SJC → ORD Jul 26, 09:30 UTCJul 26, 09:40 UTC10m
2026-07-26 UAL638 MCO → ORD Jul 26, 02:25 UTCJul 26, 07:30 UTC5h 6m
2026-07-25 UAL2633 PHL → IAH Jul 25, 22:40 UTCJul 26, 00:45 UTC2h 5m
2026-07-25 UAL1604 SFO → BNA Jul 25, 18:45 UTCJul 25, 20:40 UTC1h 55m
2026-07-25 UAL1116 BOS → ORD Jul 25, 13:05 UTCJul 25, 17:05 UTC4h 0m
2026-07-25 UAL1116 BOS → ORD Jul 25, 13:03 UTCJul 25, 17:00 UTC3h 57m
2026-07-25 UAL2278 ORD → SEA Jul 25, 07:45 UTCJul 25, 11:15 UTC3h 30m
2026-07-25 UAL1495 DFW → DEN Jul 25, 02:00 UTCJul 25, 05:45 UTC3h 45m
2026-07-24 UAL2317 EWR → AUS Jul 24, 19:25 UTCJul 24, 23:10 UTC3h 45m
2026-07-24 UAL1116 BOS → ORD Jul 24, 12:55 UTCJul 24, 16:55 UTC4h 0m
2026-07-24 UAL8188 ORD → DEN Jul 24, 07:00 UTCJul 24, 10:30 UTC3h 30m
2026-07-24 UAL1176 SJC → ORD Jul 24, 00:55 UTCJul 24, 05:25 UTC4h 30m
2026-07-24 UAL1176 SJC → ORD Jul 24, 00:46 UTCJul 24, 05:23 UTC4h 37m
2026-07-21 UAL1431 IAH → SNA Jul 21, 20:35 UTCJul 21, 21:05 UTC30m
2026-07-21 UAL1431 IAH → SNA Jul 21, 20:33 UTCJul 22, 02:02 UTC5h 29m
2026-07-21 UAL2814 - Jul 21, 14:20 UTCJul 21, 17:55 UTC3h 35m
2026-07-21 UAL1375 JAX → EWR Jul 21, 02:10 UTCJul 21, 05:45 UTC3h 35m
2026-07-20 UAL2633 DEN → SFO Jul 20, 22:30 UTCJul 21, 00:40 UTC2h 10m
2026-07-20 UAL1604 SFO → DEN Jul 20, 18:25 UTCJul 20, 20:55 UTC2h 30m
2026-07-20 UAL2391 ORD → EWR Jul 20, 13:58 UTCJul 20, 15:58 UTC2h 0m
2026-07-20 UAL2391 ORD → EWR Jul 20, 14:00 UTCJul 20, 16:00 UTC2h 0m
2026-07-20 UAL599 DEN → EWR Jul 20, 01:00 UTCJul 20, 04:00 UTC3h 0m
2026-07-19 UAL347 DEN → IAD Jul 19, 20:40 UTCJul 19, 23:35 UTC2h 55m
2026-07-19 UAL1022 MCO → DEN Jul 19, 14:20 UTCJul 19, 17:30 UTC3h 10m
2026-07-18 UAL501 DEN → MCO Jul 18, 22:14 UTCJul 19, 01:19 UTC3h 5m
2026-07-18 UAL501 DEN → MCO Jul 18, 22:10 UTCJul 19, 01:25 UTC3h 15m
2026-07-18 UAL1022 MCO → DEN Jul 18, 14:20 UTCJul 18, 17:30 UTC3h 10m
2026-07-17 UAL501 DEN → MCO Jul 17, 20:29 UTCJul 17, 23:50 UTC3h 20m
2026-07-17 UAL1865 SLC → EWR Jul 17, 14:30 UTCJul 17, 17:30 UTC3h 0m
2026-07-17 UAL2282 - Jul 17, 07:20 UTCJul 17, 11:50 UTC4h 30m
2026-07-17 UAL2282 LAX → IAD Jul 17, 07:05 UTCJul 17, 11:53 UTC4h 48m
2026-07-17 UAL1967 - Jul 17, 01:59 UTCJul 17, 05:25 UTC3h 25m
2026-07-16 UAL1954 SFO → ORD Jul 16, 19:14 UTCJul 16, 23:35 UTC4h 20m
2026-07-14 UAL1558 EWR → SFO Jul 14, 01:50 UTCJul 14, 06:40 UTC4h 50m
2026-07-13 UAL8149 SFO → EWR Jul 13, 17:20 UTCJul 13, 22:20 UTC5h 0m
2026-07-13 UAL246 - Jul 13, 11:40 UTCJul 13, 15:45 UTC4h 5m
2026-07-13 UAL8201 SFO → ORD Jul 13, 06:01 UTCJul 13, 09:30 UTC3h 29m
2026-07-13 UAL8201 SFO → PWK Jul 13, 05:55 UTCJul 13, 09:30 UTC3h 35m
2026-07-13 UAL1722 - Jul 13, 01:50 UTCJul 13, 02:45 UTC55m
2026-07-12 UAL1722 - Jul 12, 22:00 UTCJul 12, 22:10 UTC10m
2026-07-12 UAL1721 - Jul 12, 20:20 UTCJul 12, 20:30 UTC10m
2026-07-12 UAL1721 - Jul 12, 15:35 UTCJul 12, 16:05 UTC30m
2026-07-12 UAL1722 - Jul 12, 02:05 UTCJul 12, 02:45 UTC40m
2026-07-11 UAL1722 KOA → SFO Jul 11, 22:12 UTCJul 12, 02:41 UTC4h 29m
2026-07-11 UAL1722 - Jul 11, 22:01 UTCJul 11, 22:05 UTC5m
2026-07-11 UAL1721 - Jul 11, 20:10 UTCJul 11, 20:25 UTC15m
2026-07-11 UAL1721 SFO → KOA Jul 11, 15:37 UTCJul 11, 20:22 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 N57862 page for operator, model, and routing details .

Mode-S A76F66 frequently asked

What is Mode-S code A76F66?
A76F66 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N57862.
Where is Mode-S A76F66 registered?
Mode-S code A76F66 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 A76F66 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A76F66, octal 51667546, decimal 10,973,030.
What flights does A76F66 operate?
Mode-S A76F66 has broadcast 20 distinct callsigns, including UAL501, UAL1721, UAL1022, UAL1722, UAL1116.