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
Transponder active on ground
Flights observed
288
Distinct callsigns
20
Country
US
Last broadcast
1h ago

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
UAL1721 - 15 2026-07-12
UAL1722 - 14 2026-07-13
UAL501 - 13 2026-06-18
UAL1022 United Airlines 13 2026-06-19
UAL1116 - 11 2026-07-10
UAL1495 - 9 2026-07-11
UAL2814 - 8 2026-07-04
UAL2087 - 8 2026-06-23
UAL1962 United Airlines 8 2026-05-13
UAL599 - 7 2026-06-23
UAL457 - 7 2026-07-04
UAL2317 - 7 2026-07-10
UAL635 United Airlines 6 2026-06-11
UAL2348 - 6 2026-06-18
UAL1654 - 6 2026-06-20
UAL2278 - 5 2026-07-10
UAL1829 United Airlines 5 2026-06-19
UAL1777 - 5 2026-07-07
UAL798 United Airlines 4 2026-05-20
UAL2499 United Airlines 4 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1558 - Jul 14, 01:50 UTCJul 14, 05:30 UTC3h 40m
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
2026-07-11 UAL1721 - Jul 11, 15:40 UTCJul 11, 16:10 UTC30m
2026-07-11 UAL1495 ORD → SFO Jul 11, 02:23 UTCJul 11, 06:16 UTC3h 53m
2026-07-11 UAL1495 - Jul 11, 02:15 UTCJul 11, 06:20 UTC4h 5m
2026-07-10 UAL2317 SFO → ORD Jul 10, 19:20 UTCJul 10, 23:15 UTC3h 55m
2026-07-10 UAL1116 ORD → SFO Jul 10, 13:05 UTCJul 10, 17:05 UTC4h 0m
2026-07-10 UAL2278 SFO → ORD Jul 10, 07:30 UTCJul 10, 11:10 UTC3h 40m
2026-07-10 UAL1722 - Jul 10, 02:15 UTCJul 10, 02:50 UTC35m
2026-07-09 UAL1722 - Jul 9, 22:20 UTCJul 9, 22:30 UTC10m
2026-07-09 UAL1721 - Jul 9, 20:40 UTCJul 9, 21:00 UTC20m
2026-07-09 UAL1721 - Jul 9, 16:00 UTCJul 9, 16:25 UTC25m
2026-07-09 UAL1721 SFO → KOA Jul 9, 15:32 UTCJul 9, 20:55 UTC5h 23m
2026-07-09 UAL1495 - Jul 9, 02:10 UTCJul 9, 06:05 UTC3h 55m
2026-07-08 UAL2317 SFO → ORD Jul 8, 19:15 UTCJul 8, 22:55 UTC3h 40m
2026-07-08 UAL1116 - Jul 8, 12:55 UTCJul 8, 16:45 UTC3h 50m
2026-07-07 UAL1777 SFO → ORD Jul 7, 22:05 UTCJul 8, 01:35 UTC3h 30m
2026-07-07 UAL543 - Jul 7, 16:00 UTCJul 7, 20:00 UTC4h 0m
2026-07-07 UAL2278 SFO → ORD Jul 7, 08:15 UTCJul 7, 11:55 UTC3h 40m
2026-07-07 UAL1495 ORD → SFO Jul 7, 02:05 UTCJul 7, 05:55 UTC3h 50m
2026-07-06 UAL2317 SFO → ORD Jul 6, 19:45 UTCJul 6, 23:20 UTC3h 35m
2026-07-06 UAL1116 - Jul 6, 13:00 UTCJul 6, 16:50 UTC3h 50m
2026-07-06 UAL8200 SFO → ORD Jul 6, 06:15 UTCJul 6, 09:55 UTC3h 40m
2026-07-06 UAL1722 - Jul 6, 02:00 UTCJul 6, 02:45 UTC45m
2026-07-05 UAL1722 KOA → SFO Jul 5, 22:12 UTCJul 6, 02:40 UTC4h 28m
2026-07-05 UAL1722 - Jul 5, 22:05 UTCJul 5, 22:15 UTC10m
2026-07-05 UAL1721 SFO → KOA Jul 5, 20:15 UTCJul 5, 20:35 UTC20m
2026-07-05 UAL1721 SFO → KOA Jul 5, 15:50 UTCJul 5, 16:20 UTC30m
2026-07-05 UAL1721 SFO → KOA Jul 5, 15:32 UTCJul 5, 20:30 UTC4h 58m
2026-07-05 UAL1495 ORD → SFO Jul 5, 02:53 UTCJul 5, 06:20 UTC3h 27m
2026-07-05 UAL1495 - Jul 5, 02:40 UTCJul 5, 05:30 UTC2h 50m
2026-07-04 UAL457 - Jul 4, 20:55 UTCJul 5, 00:25 UTC3h 30m
2026-07-04 UAL2814 ORD → LAX Jul 4, 14:18 UTCJul 4, 18:00 UTC3h 42m
2026-07-04 UAL2814 ORD → LAX Jul 4, 14:20 UTCJul 4, 18:10 UTC3h 50m
2026-07-04 UAL1777 - Jul 4, 04:55 UTCJul 4, 05:10 UTC15m
2026-07-04 UAL1777 SFO → ORD Jul 4, 01:24 UTCJul 4, 04:37 UTC3h 13m
2026-07-04 UAL1777 SFO → ORD Jul 4, 01:20 UTCJul 4, 05:10 UTC3h 50m
2026-07-01 UAL373 BTV → ORD Jul 1, 03:40 UTCJul 1, 08:10 UTC4h 30m

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?
Mode-S A76F66 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 A76F66, octal 51667546, decimal 10,973,030.
What flights does A76F66 operate?
Mode-S A76F66 has broadcast 20 distinct callsigns, including UAL1721, UAL1722, UAL501, UAL1022, UAL1116.