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 Jul 26, 21:30 UTC
Flights observed
542
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

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
UAL1639 United Airlines 9 2026-07-25
UAL1848 - 8 2026-07-12
UAL676 - 7 2026-07-17
UAL546 United Airlines 7 2026-07-26
UAL2097 - 7 2026-07-01
UAL1494 United Airlines 7 2026-06-09
UAL570 United Airlines 6 2026-07-26
UAL2154 - 6 2026-06-30
UAL1760 United Airlines 6 2026-07-17
UAL1635 United Airlines 6 2026-07-25
UAL412 - 5 2026-07-01
UAL358 United Airlines 5 2026-05-14
UAL2669 United Airlines 5 2026-07-24
UAL1504 - 5 2026-07-14
UAL1357 - 5 2026-07-20
UAL1327 United Airlines 5 2026-07-25
UAL481 United Airlines 4 2026-07-22
UAL2634 United Airlines 4 2026-05-13
UAL2610 United Airlines 4 2026-04-19
UAL2471 United Airlines 4 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL546 DEN → TUS Jul 26, 19:30 UTCJul 26, 21:30 UTC2h 0m
2026-07-26 UAL570 BOS → EWR Jul 26, 16:21 UTCJul 26, 17:55 UTC1h 34m
2026-07-26 UAL570 BOS → EWR Jul 26, 16:20 UTCJul 26, 18:00 UTC1h 40m
2026-07-26 UAL2053 SFO → PDX Jul 26, 11:40 UTCJul 26, 13:25 UTC1h 45m
2026-07-26 UAL2770 MSY → ORD Jul 26, 01:30 UTCJul 26, 02:50 UTC1h 20m
2026-07-25 UAL1639 OGG → SFO Jul 25, 23:05 UTCJul 25, 23:55 UTC50m
2026-07-25 UAL1639 OGG → SFO Jul 25, 19:40 UTCJul 25, 21:20 UTC1h 40m
2026-07-25 UAL1327 EWR → CMH Jul 25, 15:25 UTCJul 25, 18:05 UTC2h 40m
2026-07-25 UAL1635 LAX → IAD Jul 25, 04:05 UTCJul 25, 05:20 UTC1h 15m
2026-07-25 UAL1240 SAT → EWR Jul 25, 00:15 UTCJul 25, 02:50 UTC2h 35m
2026-07-24 UAL2330 PHX → EWR Jul 24, 20:10 UTCJul 24, 23:05 UTC2h 55m
2026-07-24 UAL1226 EWR → LAX Jul 24, 16:55 UTCJul 24, 18:50 UTC1h 55m
2026-07-24 UAL2669 SAT → SFO Jul 24, 13:20 UTCJul 24, 15:25 UTC2h 5m
2026-07-24 UAL299 EWR → RSW Jul 24, 10:20 UTCJul 24, 12:00 UTC1h 40m
2026-07-24 UAL1398 - Jul 24, 00:10 UTCJul 24, 01:40 UTC1h 30m
2026-07-23 UAL2824 EWR → SFO Jul 23, 21:40 UTCJul 23, 22:05 UTC25m
2026-07-23 UAL2824 EWR → SFO Jul 23, 19:25 UTCJul 23, 22:05 UTC2h 40m
2026-07-23 UAL2824 EWR → SFO Jul 23, 19:16 UTCJul 23, 21:25 UTC2h 9m
2026-07-23 UAL490 YYZ → ORD Jul 23, 16:10 UTCJul 23, 18:20 UTC2h 10m
2026-07-23 UAL490 YYZ → ORD Jul 23, 16:17 UTCJul 23, 18:17 UTC2h 0m
2026-07-23 UAL786 - Jul 23, 12:50 UTCJul 23, 14:20 UTC1h 30m
2026-07-23 UAL2762 SFO → FTW Jul 23, 02:50 UTCJul 23, 04:15 UTC1h 25m
2026-07-22 UAL1067 IAH → BOS Jul 22, 22:20 UTCJul 23, 00:20 UTC2h 0m
2026-07-22 UAL2343 RSW → DEN Jul 22, 19:10 UTCJul 22, 20:20 UTC1h 10m
2026-07-22 UAL2451 KRK → GDN Jul 22, 13:45 UTCJul 22, 17:30 UTC3h 45m
2026-07-22 UAL481 BNA → EWR Jul 22, 01:50 UTCJul 22, 05:25 UTC3h 35m
2026-07-21 UAL1067 IAH → BOS Jul 21, 21:55 UTCJul 21, 23:35 UTC1h 40m
2026-07-21 UAL2343 RSW → DEN Jul 21, 19:24 UTCJul 21, 20:18 UTC54m
2026-07-21 UAL2343 RSW → DEN Jul 21, 19:10 UTCJul 21, 20:20 UTC1h 10m
2026-07-21 UAL2451 KRK → GDN Jul 21, 13:45 UTCJul 21, 17:40 UTC3h 55m
2026-07-21 UAL481 - Jul 21, 01:35 UTCJul 21, 05:35 UTC4h 0m
2026-07-21 UAL481 ORD → SJC Jul 21, 01:45 UTCJul 21, 05:34 UTC3h 49m
2026-07-20 UAL1357 EUG → ORD Jul 20, 19:55 UTCJul 20, 23:40 UTC3h 45m
2026-07-20 UAL2483 ORD → PDX Jul 20, 14:20 UTCJul 20, 18:15 UTC3h 55m
2026-07-19 UAL2770 - Jul 19, 23:15 UTCJul 20, 00:40 UTC1h 25m
2026-07-19 UAL1634 - Jul 19, 21:00 UTCJul 19, 22:00 UTC1h 0m
2026-07-19 UAL2437 - Jul 19, 17:10 UTCJul 19, 18:10 UTC1h 0m
2026-07-19 UAL1484 - Jul 19, 14:10 UTCJul 19, 15:10 UTC1h 0m
2026-07-19 UAL1484 ORD → MCI Jul 19, 14:10 UTCJul 19, 15:11 UTC1h 1m
2026-07-19 UAL451 BNA → ORD Jul 19, 11:20 UTCJul 19, 12:40 UTC1h 20m
2026-07-19 UAL1608 MSN → DEN Jul 19, 02:40 UTCJul 19, 04:45 UTC2h 5m
2026-07-18 UAL1525 - Jul 18, 12:25 UTCJul 18, 13:40 UTC1h 15m
2026-07-18 UAL1233 ORD → SFO Jul 18, 00:04 UTCJul 18, 01:05 UTC1h 0m
2026-07-17 UAL546 EWR → ORD Jul 17, 20:10 UTCJul 17, 21:22 UTC1h 12m
2026-07-17 UAL546 SAV → EWR Jul 17, 19:49 UTCJul 17, 21:25 UTC1h 35m
2026-07-17 UAL570 EWR → SAV Jul 17, 16:10 UTCJul 17, 17:55 UTC1h 45m
2026-07-17 UAL1760 IAH → RDU Jul 17, 11:20 UTCJul 17, 14:39 UTC3h 20m
2026-07-17 UAL676 EWR → AUS Jul 17, 00:50 UTCJul 17, 04:04 UTC3h 15m
2026-07-16 UAL546 SAV → EWR Jul 16, 19:50 UTCJul 16, 21:30 UTC1h 40m
2026-07-16 UAL570 - Jul 16, 16:19 UTCJul 16, 18:00 UTC1h 40m

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 Jul 26, 21:30 UTC.
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 UAL1639, UAL1848, UAL676, UAL546, UAL2097.