Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC234F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N881UA · AIRBUS A-319 · operated by UMB BANK NA TRUSTEE

Hex
AC234F
Octal
53021517
Decimal
11,281,231
Country
US
Tail
N881UA
Type
A319
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
517
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S AC234F.

Country allocation

The ICAO 24-bit address AC234F 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
UAL2272 - 6 2026-07-10
UAL1300 United Airlines 6 2026-05-08
UAL2603 United Airlines 5 2026-05-20
UAL2213 United Airlines 5 2026-05-15
UAL1762 United Airlines 5 2026-05-20
UAL1535 - 5 2026-06-28
UAL1439 - 5 2026-06-29
UAL1204 - 5 2026-07-07
UAL694 United Airlines 4 2026-06-25
UAL637 United Airlines 4 2026-05-20
UAL499 United Airlines 4 2026-05-15
UAL429 - 4 2026-07-16
UAL283 - 4 2026-07-19
UAL255 - 4 2026-07-07
UAL2470 - 4 2026-07-07
UAL2289 - 4 2026-07-08
UAL225 - 4 2026-07-17
UAL2163 United Airlines 4 2026-05-20
UAL2057 - 4 2026-07-19
UAL1768 United Airlines 4 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1367 BOS → IAH Jul 26, 20:30 UTCJul 26, 21:40 UTC1h 10m
2026-07-26 UAL2749 LAS → SFO Jul 26, 18:05 UTCJul 26, 19:10 UTC1h 5m
2026-07-26 UAL364 BDL → DEN Jul 26, 14:15 UTCJul 26, 15:55 UTC1h 40m
2026-07-25 UAL1991 EWR → SFO Jul 25, 21:50 UTCJul 25, 23:20 UTC1h 30m
2026-07-25 UAL1991 EWR → SFO Jul 25, 21:40 UTCJul 25, 23:25 UTC1h 45m
2026-07-25 UAL353 SAN → EWR Jul 25, 17:40 UTCJul 25, 20:05 UTC2h 25m
2026-07-25 UAL2018 LAX → TPA Jul 25, 13:50 UTCJul 25, 16:30 UTC2h 40m
2026-07-25 UAL299 EWR → RSW Jul 25, 10:25 UTCJul 25, 11:45 UTC1h 20m
2026-07-25 UAL299 EWR → RSW Jul 25, 10:22 UTCJul 25, 12:00 UTC1h 38m
2026-07-25 UAL1305 EWR → RDU Jul 25, 00:35 UTCJul 25, 03:10 UTC2h 35m
2026-07-24 UAL2128 SLC → SFO Jul 24, 18:05 UTCJul 24, 22:05 UTC4h 0m
2026-07-24 UAL1610 ORD → LGA Jul 24, 14:35 UTCJul 24, 16:05 UTC1h 30m
2026-07-24 UAL1126 LAS → EWR Jul 24, 00:27 UTCJul 24, 02:08 UTC1h 41m
2026-07-24 UAL1126 LAS → EWR Jul 24, 00:45 UTCJul 24, 02:10 UTC1h 25m
2026-07-23 UAL1728 SFO → IAH Jul 23, 21:35 UTCJul 23, 22:55 UTC1h 20m
2026-07-23 UAL1728 SFO → IAH Jul 23, 21:17 UTCJul 23, 22:48 UTC1h 31m
2026-07-23 UAL792 LAX → EWR Jul 23, 18:55 UTCJul 23, 19:55 UTC1h 0m
2026-07-23 UAL1521 IAD → MSY Jul 23, 16:05 UTCJul 23, 17:40 UTC1h 35m
2026-07-23 UAL1521 IAD → MSY Jul 23, 16:08 UTCJul 23, 17:35 UTC1h 27m
2026-07-23 UAL549 BOS → ORD Jul 23, 04:05 UTCJul 23, 05:30 UTC1h 25m
2026-07-23 UAL259 DEN → MCO Jul 23, 01:55 UTCJul 23, 02:15 UTC20m
2026-07-22 UAL259 DEN → MCO Jul 22, 19:55 UTCJul 22, 23:05 UTC3h 10m
2026-07-22 UAL487 PHX → SFO Jul 22, 17:35 UTCJul 22, 18:20 UTC45m
2026-07-22 UAL1597 LAX → SFO Jul 22, 11:35 UTCJul 22, 15:55 UTC4h 20m
2026-07-21 UAL1095 MYR → EWR Jul 21, 19:05 UTCJul 21, 23:15 UTC4h 10m
2026-07-21 UAL2818 PDX → SFO Jul 21, 15:15 UTCJul 21, 16:40 UTC1h 25m
2026-07-21 UAL2413 EWR → DFW Jul 21, 04:10 UTCJul 21, 05:20 UTC1h 10m
2026-07-20 UAL1863 PUJ → ORD Jul 20, 21:55 UTCJul 21, 02:20 UTC4h 24m
2026-07-20 UAL1642 SFO → DTW Jul 20, 16:20 UTCJul 20, 20:40 UTC4h 20m
2026-07-20 UAL538 EWR → BNA Jul 20, 12:10 UTCJul 20, 14:05 UTC1h 55m
2026-07-20 UAL737 - Jul 20, 02:00 UTCJul 20, 04:05 UTC2h 5m
2026-07-19 UAL1367 MSP → SFO Jul 19, 20:40 UTCJul 20, 00:10 UTC3h 30m
2026-07-19 UAL283 DFW → EWR Jul 19, 15:55 UTCJul 19, 19:12 UTC3h 17m
2026-07-19 UAL283 SFO → MSP Jul 19, 16:05 UTCJul 19, 19:15 UTC3h 10m
2026-07-19 UAL1429 IAH → EWR Jul 19, 07:45 UTCJul 19, 10:45 UTC3h 0m
2026-07-19 UAL2057 - Jul 19, 04:25 UTCJul 19, 06:40 UTC2h 15m
2026-07-18 UAL8260 SBA → DEN Jul 18, 23:45 UTCJul 19, 01:10 UTC1h 25m
2026-07-18 UAL2684 PHL → ORD Jul 18, 16:10 UTCJul 18, 17:30 UTC1h 20m
2026-07-18 UAL2287 - Jul 18, 13:55 UTCJul 18, 14:50 UTC55m
2026-07-18 UAL549 DEN → DSM Jul 18, 00:10 UTCJul 18, 01:30 UTC1h 20m
2026-07-17 UAL1510 - Jul 17, 19:45 UTCJul 17, 22:15 UTC2h 30m
2026-07-17 UAL1479 DEN → SDF Jul 17, 16:15 UTCJul 17, 18:29 UTC2h 15m
2026-07-17 UAL225 - Jul 17, 12:55 UTCJul 17, 14:39 UTC1h 45m
2026-07-17 UAL225 RNO → DEN Jul 17, 12:43 UTCJul 17, 14:35 UTC1h 52m
2026-07-17 UAL2852 - Jul 17, 03:25 UTCJul 17, 05:15 UTC1h 50m
2026-07-17 UAL439 AUS → DEN Jul 17, 00:14 UTCJul 17, 02:05 UTC1h 50m
2026-07-17 UAL439 AUS → DEN Jul 17, 00:00 UTCJul 17, 01:59 UTC1h 59m
2026-07-16 UAL1711 - Jul 16, 22:25 UTCJul 16, 22:55 UTC30m
2026-07-16 UAL1091 - Jul 16, 17:49 UTCJul 16, 19:35 UTC1h 45m
2026-07-16 UAL1091 MEX → IAH Jul 16, 17:53 UTCJul 16, 19:35 UTC1h 42m

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 N881UA page for operator, model, and routing details .

Mode-S AC234F frequently asked

What is Mode-S code AC234F?
AC234F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N881UA.
Where is Mode-S AC234F registered?
Mode-S code AC234F 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 AC234F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC234F, octal 53021517, decimal 11,281,231.
What flights does AC234F operate?
Mode-S AC234F has broadcast 20 distinct callsigns, including UAL2272, UAL1300, UAL2603, UAL2213, UAL1762.