Apparatus

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sensors Mode-S transponder

A76F68

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N57864 · BOEING 757-300 · operated by UNITED AIRLINES INC

Hex
A76F68
Octal
51667550
Decimal
10,973,032
Country
US
Tail
N57864
Type
B753
Broadcasting now · callsign UAL1022 · 36,000 ft
Flights observed
325
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Current position

A76F68 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A76F68 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 United Airlines 14 2026-07-04
UAL1722 - 13 2026-07-05
UAL2348 - 11 2026-07-18
UAL1654 United Airlines 10 2026-07-18
UAL599 United Airlines 9 2026-07-23
UAL1829 - 9 2026-07-13
UAL1431 United Airlines 9 2026-07-20
UAL531 United Airlines 8 2026-05-13
UAL2087 - 8 2026-07-19
UAL1509 United Airlines 8 2026-07-22
UAL2814 - 7 2026-07-10
UAL246 United Airlines 7 2026-07-26
UAL2292 United Airlines 7 2026-05-13
UAL1495 - 7 2026-07-04
UAL373 - 6 2026-07-21
UAL1221 United Airlines 6 2026-07-22
UAL1116 - 6 2026-07-03
UAL2317 - 5 2026-07-03
UAL1763 - 5 2026-06-15
UAL1719 United Airlines 5 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1954 RDM → SFO Jul 26, 18:15 UTCJul 26, 21:55 UTC3h 40m
2026-07-26 UAL246 ORD → LGA Jul 26, 11:30 UTCJul 26, 15:30 UTC4h 0m
2026-07-26 UAL1411 SFO → EWR Jul 26, 00:30 UTCJul 26, 02:35 UTC2h 5m
2026-07-25 UAL2767 MCO → ORD Jul 25, 20:20 UTCJul 25, 22:20 UTC2h 0m
2026-07-25 UAL1129 EWR → SEA Jul 25, 16:40 UTCJul 25, 18:35 UTC1h 55m
2026-07-25 UAL1575 MSP → EWR Jul 25, 12:40 UTCJul 25, 14:40 UTC2h 0m
2026-07-25 UAL2791 BWI → EWR Jul 25, 00:30 UTCJul 25, 02:25 UTC1h 55m
2026-07-24 UAL2767 MCO → ORD Jul 24, 20:15 UTCJul 24, 22:15 UTC2h 0m
2026-07-24 UAL1129 EWR → SEA Jul 24, 16:40 UTCJul 24, 18:35 UTC1h 55m
2026-07-24 UAL1575 MSP → EWR Jul 24, 12:40 UTCJul 24, 14:40 UTC2h 0m
2026-07-24 UAL2791 BWI → EWR Jul 24, 03:35 UTCJul 24, 05:35 UTC2h 0m
2026-07-23 UAL599 DEN → EWR Jul 23, 22:10 UTCJul 24, 01:35 UTC3h 25m
2026-07-23 UAL599 DEN → EWR Jul 23, 22:05 UTCJul 24, 01:25 UTC3h 20m
2026-07-23 UAL2268 IAD → MCO Jul 23, 15:35 UTCJul 23, 20:05 UTC4h 30m
2026-07-23 UAL1719 ORD → SFO Jul 23, 08:28 UTCJul 23, 13:02 UTC4h 34m
2026-07-23 UAL1719 ORD → SFO Jul 23, 08:20 UTCJul 23, 08:30 UTC10m
2026-07-23 UAL1718 LAS → LAX Jul 23, 05:35 UTCJul 23, 05:40 UTC5m
2026-07-23 UAL1718 LAS → LAX Jul 23, 00:25 UTCJul 23, 00:50 UTC25m
2026-07-22 UAL1221 PDX → EWR Jul 22, 21:20 UTCJul 22, 22:00 UTC40m
2026-07-22 UAL1221 PDX → EWR Jul 22, 17:15 UTCJul 22, 17:35 UTC20m
2026-07-22 UAL1509 SFO → HNL Jul 22, 05:15 UTCJul 22, 05:25 UTC10m
2026-07-22 UAL1509 SFO → HNL Jul 22, 00:30 UTCJul 22, 01:10 UTC40m
2026-07-22 UAL1509 SFO → HNL Jul 22, 00:11 UTCJul 22, 05:41 UTC5h 30m
2026-07-21 UAL373 - Jul 21, 20:55 UTCJul 21, 21:55 UTC1h 0m
2026-07-21 UAL373 - Jul 21, 17:20 UTCJul 21, 17:35 UTC15m
2026-07-20 UAL1431 IAH → SNA Jul 20, 20:40 UTCJul 21, 01:50 UTC5h 10m
2026-07-20 UAL1868 LAX → EWR Jul 20, 13:25 UTCJul 20, 17:55 UTC4h 30m
2026-07-19 UAL2087 DEN → IAD Jul 19, 18:30 UTCJul 19, 21:15 UTC2h 45m
2026-07-18 UAL1654 OMA → SFO Jul 18, 23:45 UTCJul 19, 01:45 UTC2h 0m
2026-07-18 UAL8229 LGA → YYZ Jul 18, 20:15 UTCJul 18, 22:15 UTC2h 0m
2026-07-18 UAL8229 LGA → YYZ Jul 18, 19:59 UTCJul 18, 22:12 UTC2h 13m
2026-07-18 UAL2348 SFO → DEN Jul 18, 16:00 UTCJul 18, 18:00 UTC2h 0m
2026-07-18 UAL1176 - Jul 18, 13:15 UTCJul 18, 13:55 UTC40m
2026-07-18 UAL638 MCO → ORD Jul 18, 07:10 UTCJul 18, 07:30 UTC20m
2026-07-18 UAL638 MCO → ORD Jul 18, 02:35 UTCJul 18, 03:15 UTC41m
2026-07-17 UAL2633 - Jul 17, 22:49 UTCJul 18, 01:05 UTC2h 15m
2026-07-17 UAL2633 DEN → SFO Jul 17, 22:06 UTCJul 18, 01:02 UTC2h 56m
2026-07-17 UAL1604 SFO → DEN Jul 17, 18:06 UTCJul 17, 20:01 UTC1h 55m
2026-07-17 UAL1604 - Jul 17, 18:00 UTCJul 17, 20:00 UTC2h 0m
2026-07-17 UAL2391 ORD → EWR Jul 17, 14:00 UTCJul 17, 16:10 UTC2h 10m
2026-07-17 UAL1865 SLC → EWR Jul 17, 00:50 UTCJul 17, 03:59 UTC3h 10m
2026-07-16 UAL347 DEN → IAD Jul 16, 20:12 UTCJul 16, 23:04 UTC2h 52m
2026-07-16 UAL347 DEN → IAD Jul 16, 20:15 UTCJul 16, 23:05 UTC2h 50m
2026-07-16 UAL1022 MCO → DEN Jul 16, 14:10 UTCJul 16, 17:20 UTC3h 10m
2026-07-15 UAL501 DEN → MCO Jul 15, 20:10 UTCJul 15, 23:25 UTC3h 15m
2026-07-15 UAL2348 SFO → DEN Jul 15, 16:35 UTCJul 15, 18:35 UTC2h 0m
2026-07-15 UAL1176 - Jul 15, 13:20 UTCJul 15, 14:15 UTC55m
2026-07-15 UAL1176 - Jul 15, 09:35 UTCJul 15, 09:50 UTC15m
2026-07-15 UAL638 SFO → HNL Jul 15, 02:50 UTCJul 15, 07:50 UTC5h 0m
2026-07-14 UAL2391 - Jul 14, 14:00 UTCJul 14, 16:05 UTC2h 5m

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 N57864 page for operator, model, and routing details .

Mode-S A76F68 frequently asked

What is Mode-S code A76F68?
A76F68 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N57864.
Where is Mode-S A76F68 registered?
Mode-S code A76F68 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 A76F68 broadcasting right now?
Yes. Mode-S A76F68 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A76F68, octal 51667550, decimal 10,973,032.
What flights does A76F68 operate?
Mode-S A76F68 has broadcast 20 distinct callsigns, including UAL1721, UAL1722, UAL2348, UAL1654, UAL599.