Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC033E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N873UA · AIRBUS A-319 · operated by UMB BANK NA TRUSTEE

Hex
AC033E
Octal
53001476
Decimal
11,273,022
Country
US
Tail
N873UA
Type
A319
No current signal · last broadcast 2h ago
Flights observed
480
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S AC033E.

Country allocation

The ICAO 24-bit address AC033E 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
UAL1848 - 8 2026-07-12
UAL2097 - 7 2026-07-01
UAL1639 - 7 2026-06-16
UAL1494 United Airlines 7 2026-06-09
UAL2154 - 6 2026-06-30
UAL412 - 5 2026-07-01
UAL358 United Airlines 5 2026-05-14
UAL1635 United Airlines 5 2026-05-30
UAL1504 - 5 2026-07-14
UAL676 - 4 2026-07-10
UAL2669 United Airlines 4 2026-06-15
UAL2634 United Airlines 4 2026-05-13
UAL2610 United Airlines 4 2026-04-19
UAL2471 United Airlines 4 2026-05-14
UAL2289 United Airlines 4 2026-05-18
UAL1760 - 4 2026-07-11
UAL1327 - 4 2026-06-16
UAL738 - 3 2026-06-20
UAL691 United Airlines 3 2026-04-18
UAL546 - 3 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1504 - Jul 14, 00:05 UTCJul 14, 01:30 UTC1h 25m
2026-07-14 UAL1504 ORD → YOW Jul 14, 00:17 UTCJul 14, 01:16 UTC59m
2026-07-13 UAL365 - Jul 13, 18:35 UTCJul 13, 21:05 UTC2h 30m
2026-07-13 UAL215 ORD → ABQ Jul 13, 14:30 UTCJul 13, 16:50 UTC2h 20m
2026-07-13 UAL785 ATL → ORD Jul 13, 01:55 UTCJul 13, 03:45 UTC1h 50m
2026-07-13 UAL785 ATL → ORD Jul 13, 01:42 UTCJul 13, 03:26 UTC1h 44m
2026-07-12 UAL1848 - Jul 12, 20:50 UTCJul 12, 22:40 UTC1h 50m
2026-07-12 UAL1435 AUS → EWR Jul 12, 15:25 UTCJul 12, 18:45 UTC3h 20m
2026-07-12 UAL2035 EWR → AUS Jul 12, 10:25 UTCJul 12, 13:45 UTC3h 20m
2026-07-11 UAL286 AUS → EWR Jul 11, 21:38 UTCJul 12, 00:49 UTC3h 11m
2026-07-11 UAL286 AUS → EWR Jul 11, 21:40 UTCJul 12, 00:45 UTC3h 5m
2026-07-11 UAL1155 DEN → IND Jul 11, 16:35 UTCJul 11, 19:55 UTC3h 20m
2026-07-11 UAL1760 - Jul 11, 11:20 UTCJul 11, 14:40 UTC3h 20m
2026-07-10 UAL676 - Jul 10, 23:55 UTCJul 11, 03:20 UTC3h 25m
2026-07-10 UAL546 SAV → EWR Jul 10, 20:00 UTCJul 10, 21:45 UTC1h 45m
2026-07-10 UAL570 EWR → SAV Jul 10, 16:15 UTCJul 10, 18:00 UTC1h 45m
2026-07-10 UAL1760 AUS → EWR Jul 10, 11:20 UTCJul 10, 14:40 UTC3h 20m
2026-07-10 UAL676 EWR → AUS Jul 10, 01:50 UTCJul 10, 05:10 UTC3h 20m
2026-07-08 UAL2394 BOS → EWR Jul 8, 15:25 UTCJul 8, 16:15 UTC50m
2026-07-08 UAL2394 BOS → EWR Jul 8, 15:12 UTCJul 8, 16:18 UTC1h 6m
2026-07-08 UAL1110 EWR → BOS Jul 8, 13:00 UTCJul 8, 13:40 UTC40m
2026-07-08 UAL1525 - Jul 8, 10:20 UTCJul 8, 11:25 UTC1h 5m
2026-07-08 UAL1233 - Jul 8, 01:35 UTCJul 8, 02:35 UTC1h 0m
2026-07-07 UAL546 - Jul 7, 19:55 UTCJul 7, 21:35 UTC1h 40m
2026-07-07 UAL570 BOS → EWR Jul 7, 16:30 UTCJul 7, 18:10 UTC1h 40m
2026-07-07 UAL1760 IAH → RDU Jul 7, 11:30 UTCJul 7, 14:40 UTC3h 10m
2026-07-07 UAL676 EWR → AUS Jul 7, 00:25 UTCJul 7, 03:55 UTC3h 30m
2026-07-06 UAL1435 AUS → EWR Jul 6, 17:05 UTCJul 6, 20:50 UTC3h 45m
2026-07-06 UAL1435 AUS → EWR Jul 6, 17:04 UTCJul 6, 20:50 UTC3h 46m
2026-07-06 UAL2035 LAX → SFO Jul 6, 10:20 UTCJul 6, 13:35 UTC3h 15m
2026-07-06 UAL286 AUS → EWR Jul 6, 01:10 UTCJul 6, 04:45 UTC3h 35m
2026-07-05 UAL1155 DEN → IND Jul 5, 16:35 UTCJul 5, 19:50 UTC3h 15m
2026-07-05 UAL2690 BNA → EWR Jul 5, 13:30 UTCJul 5, 15:20 UTC1h 50m
2026-07-05 UAL2784 ORD → BNA Jul 5, 02:43 UTCJul 5, 04:15 UTC1h 32m
2026-07-05 UAL2784 ORD → BNA Jul 5, 02:40 UTCJul 5, 04:15 UTC1h 35m
2026-07-05 UAL1655 BNA → EWR Jul 5, 00:10 UTCJul 5, 00:55 UTC45m
2026-07-04 UAL1655 BNA → EWR Jul 4, 18:40 UTCJul 4, 21:45 UTC3h 5m
2026-07-04 UAL764 - Jul 4, 14:20 UTCJul 4, 17:35 UTC3h 15m
2026-07-04 UAL2333 - Jul 4, 10:10 UTCJul 4, 12:10 UTC2h 0m
2026-07-04 UAL3905 - Jul 4, 01:15 UTCJul 4, 01:45 UTC30m
2026-07-03 UAL1451 - Jul 3, 16:30 UTCJul 3, 19:35 UTC3h 5m
2026-07-02 UAL352 - Jul 2, 20:20 UTCJul 2, 20:50 UTC30m
2026-07-02 UAL1772 - Jul 2, 18:05 UTCJul 2, 18:35 UTC30m
2026-07-02 UAL1772 DEN → MTJ Jul 2, 18:07 UTCJul 2, 18:43 UTC36m
2026-07-02 UAL255 ATW → DEN Jul 2, 13:55 UTCJul 2, 16:10 UTC2h 15m
2026-07-02 UAL1204 DEN → ATW Jul 2, 00:25 UTCJul 2, 02:05 UTC1h 40m
2026-07-01 UAL2187 BUR → DEN Jul 1, 19:55 UTCJul 1, 21:45 UTC1h 50m
2026-07-01 UAL2115 SFO → BUR Jul 1, 17:55 UTCJul 1, 18:50 UTC55m
2026-07-01 UAL2115 SFO → BUR Jul 1, 17:51 UTCJul 1, 18:41 UTC50m
2026-07-01 UAL822 - Jul 1, 11:45 UTCJul 1, 15:50 UTC4h 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 N873UA page for operator, model, and routing details .

Mode-S AC033E frequently asked

What is Mode-S code AC033E?
AC033E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N873UA.
Where is Mode-S AC033E registered?
Mode-S code AC033E 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 AC033E broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC033E, octal 53001476, decimal 11,273,022.
What flights does AC033E operate?
Mode-S AC033E has broadcast 20 distinct callsigns, including UAL1848, UAL2097, UAL1639, UAL1494, UAL2154.