Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC0AAC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N875UA · AIRBUS A-319 · operated by UMB BANK NA TRUSTEE

Hex
AC0AAC
Octal
53005254
Decimal
11,274,924
Country
US
Tail
N875UA
Type
A319
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
504
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AC0AAC.

Country allocation

The ICAO 24-bit address AC0AAC 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
UAL1060 - 10 2026-07-23
UAL1091 - 8 2026-07-23
UAL1541 United Airlines 6 2026-07-22
UAL1095 - 6 2026-07-12
UAL822 - 5 2026-06-14
UAL515 United Airlines 5 2026-06-11
UAL429 - 5 2026-07-19
UAL2861 - 5 2026-07-13
UAL2045 - 5 2026-07-14
UAL1259 United Airlines 5 2026-06-12
UAL412 - 4 2026-06-14
UAL2744 United Airlines 4 2026-07-08
UAL2680 - 4 2026-06-26
UAL2678 - 4 2026-04-17
UAL259 - 4 2026-07-06
UAL2321 United Airlines 4 2026-04-18
UAL2289 United Airlines 4 2026-06-16
UAL2187 United Airlines 4 2026-06-07
UAL1899 United Airlines 4 2026-07-22
UAL1871 United Airlines 4 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL793 SFO → ORD Jul 26, 21:00 UTCJul 26, 22:45 UTC1h 45m
2026-07-26 UAL745 FLL → DEN Jul 26, 17:35 UTCJul 26, 19:15 UTC1h 40m
2026-07-26 UAL530 ELP → ORD Jul 26, 14:35 UTCJul 26, 16:00 UTC1h 25m
2026-07-26 UAL1778 EWR → SAT Jul 26, 10:30 UTCJul 26, 12:15 UTC1h 45m
2026-07-26 UAL1568 ORD → SFO Jul 26, 00:10 UTCJul 26, 01:20 UTC1h 10m
2026-07-25 UAL2160 PHX → SFO Jul 25, 19:30 UTCJul 25, 21:25 UTC1h 55m
2026-07-25 UAL441 EWR → FLL Jul 25, 16:00 UTCJul 25, 17:50 UTC1h 50m
2026-07-24 UAL2211 ORD → SFO Jul 24, 21:15 UTCJul 24, 23:20 UTC2h 5m
2026-07-24 UAL1451 SFO → DEN Jul 24, 16:35 UTCJul 24, 19:50 UTC3h 15m
2026-07-24 UAL225 ATL → DEN Jul 24, 12:40 UTCJul 24, 14:25 UTC1h 45m
2026-07-24 UAL2852 EWR → DEN Jul 24, 04:25 UTCJul 24, 06:15 UTC1h 50m
2026-07-24 UAL2852 EWR → DEN Jul 24, 04:33 UTCJul 24, 06:16 UTC1h 43m
2026-07-24 UAL439 EWR → GRR Jul 24, 00:55 UTCJul 24, 03:05 UTC2h 10m
2026-07-23 UAL8111 ATL → YYZ Jul 23, 22:25 UTCJul 23, 22:50 UTC25m
2026-07-23 UAL1091 - Jul 23, 18:00 UTCJul 23, 19:45 UTC1h 45m
2026-07-23 UAL1060 - Jul 23, 16:30 UTCJul 23, 16:50 UTC20m
2026-07-23 UAL1060 - Jul 23, 14:40 UTCJul 23, 15:55 UTC1h 15m
2026-07-23 UAL1060 IAH → MEX Jul 23, 14:46 UTCJul 23, 16:44 UTC1h 58m
2026-07-23 UAL1871 MCO → EWR Jul 23, 01:00 UTCJul 23, 01:50 UTC50m
2026-07-22 UAL1899 ORD → YYC Jul 22, 22:10 UTCJul 23, 00:00 UTC1h 50m
2026-07-22 UAL1541 IAH → LGA Jul 22, 18:15 UTCJul 22, 20:05 UTC1h 50m
2026-07-22 UAL456 EWR → SRQ Jul 22, 14:45 UTCJul 22, 16:40 UTC1h 55m
2026-07-21 UAL1225 ONT → SFO Jul 21, 01:55 UTCJul 21, 03:45 UTC1h 50m
2026-07-20 UAL1604 - Jul 20, 22:25 UTCJul 21, 00:20 UTC1h 55m
2026-07-20 UAL1380 STL → DEN Jul 20, 18:55 UTCJul 20, 20:41 UTC1h 46m
2026-07-20 UAL1380 STL → DEN Jul 20, 18:55 UTCJul 20, 20:45 UTC1h 50m
2026-07-20 UAL652 DEN → STL Jul 20, 15:55 UTCJul 20, 17:30 UTC1h 35m
2026-07-19 UAL439 EWR → GRR Jul 19, 23:40 UTCJul 20, 01:25 UTC1h 45m
2026-07-19 UAL1711 - Jul 19, 21:55 UTCJul 19, 22:25 UTC30m
2026-07-19 UAL1091 - Jul 19, 18:05 UTCJul 19, 19:55 UTC1h 50m
2026-07-19 UAL1060 - Jul 19, 14:40 UTCJul 19, 16:25 UTC1h 45m
2026-07-19 UAL1085 - Jul 19, 11:10 UTCJul 19, 12:55 UTC1h 45m
2026-07-19 UAL429 - Jul 19, 03:10 UTCJul 19, 04:55 UTC1h 45m
2026-07-19 UAL429 IAH → MEX Jul 19, 03:13 UTCJul 19, 04:54 UTC1h 41m
2026-07-18 UAL283 - Jul 18, 22:55 UTCJul 19, 01:15 UTC2h 20m
2026-07-18 UAL732 DEN → MSP Jul 18, 20:05 UTCJul 18, 21:35 UTC1h 30m
2026-07-18 UAL2255 - Jul 18, 17:30 UTCJul 18, 17:55 UTC25m
2026-07-18 UAL2173 - Jul 18, 15:15 UTCJul 18, 15:30 UTC15m
2026-07-17 UAL1268 BNA → DEN Jul 17, 23:00 UTCJul 18, 01:10 UTC2h 10m
2026-07-17 UAL1608 EWR → BNA Jul 17, 19:26 UTCJul 17, 21:00 UTC1h 34m
2026-07-17 UAL1608 - Jul 17, 19:20 UTCJul 17, 21:00 UTC1h 40m
2026-07-17 UAL1637 MSP → EWR Jul 17, 15:33 UTCJul 17, 17:30 UTC1h 57m
2026-07-17 UAL1637 MSP → EWR Jul 17, 15:25 UTCJul 17, 17:40 UTC2h 15m
2026-07-17 UAL2183 EWR → MSP Jul 17, 11:30 UTCJul 17, 13:55 UTC2h 25m
2026-07-17 UAL657 MSP → EWR Jul 17, 00:50 UTCJul 17, 02:59 UTC2h 10m
2026-07-16 UAL2470 DEN → MSP Jul 16, 22:00 UTCJul 16, 23:35 UTC1h 35m
2026-07-16 UAL1541 AUS → DEN Jul 16, 18:10 UTCJul 16, 19:55 UTC1h 45m
2026-07-16 UAL456 DEN → AUS Jul 16, 14:15 UTCJul 16, 16:05 UTC1h 50m
2026-07-15 UAL1268 - Jul 15, 22:45 UTCJul 16, 01:00 UTC2h 15m
2026-07-15 UAL1608 - Jul 15, 19:20 UTCJul 15, 21:05 UTC1h 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 N875UA page for operator, model, and routing details .

Mode-S AC0AAC frequently asked

What is Mode-S code AC0AAC?
AC0AAC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N875UA.
Where is Mode-S AC0AAC registered?
Mode-S code AC0AAC 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 AC0AAC broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC0AAC, octal 53005254, decimal 11,274,924.
What flights does AC0AAC operate?
Mode-S AC0AAC has broadcast 20 distinct callsigns, including UAL1060, UAL1091, UAL1541, UAL1095, UAL822.