Apparatus

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sensors Mode-S transponder

AC523C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N893UA · AIRBUS A-319 · operated by UMB BANK NA TRUSTEE

Hex
AC523C
Octal
53051074
Decimal
11,293,244
Country
US
Tail
N893UA
Type
A319
Broadcasting now · callsign UAL1365 · 21,025 ft
Flights observed
474
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:10 UTC

Current position

AC523C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC523C 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
UAL2849 United Airlines 7 2026-07-18
UAL1564 - 6 2026-07-15
UAL364 - 5 2026-07-17
UAL2148 - 5 2026-07-16
UAL1634 - 5 2026-07-17
UAL1398 - 5 2026-07-17
UAL696 United Airlines 4 2026-07-26
UAL657 United Airlines 4 2026-06-03
UAL605 United Airlines 4 2026-05-23
UAL592 United Airlines 4 2026-06-11
UAL481 United Airlines 4 2026-06-10
UAL352 United Airlines 4 2026-07-24
UAL249 United Airlines 4 2026-05-19
UAL2160 United Airlines 4 2026-07-20
UAL2049 - 4 2026-07-20
UAL1795 United Airlines 4 2026-06-03
UAL1772 United Airlines 4 2026-07-24
UAL1531 - 4 2026-07-11
UAL1510 United Airlines 4 2026-07-23
UAL1479 United Airlines 4 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL696 RIC → DEN Jul 26, 19:50 UTCJul 26, 21:55 UTC2h 5m
2026-07-26 UAL1836 SEA → SFO Jul 26, 16:15 UTCJul 26, 18:15 UTC2h 0m
2026-07-26 UAL1506 SFO → ORD Jul 26, 12:20 UTCJul 26, 14:40 UTC2h 20m
2026-07-26 UAL2027 MSP → EWR Jul 26, 00:45 UTCJul 26, 02:50 UTC2h 5m
2026-07-25 UAL2325 ORD → PHL Jul 25, 19:45 UTCJul 25, 22:05 UTC2h 20m
2026-07-25 UAL2273 DTW → IAH Jul 25, 16:05 UTCJul 25, 18:25 UTC2h 20m
2026-07-25 UAL1841 SFO → IAH Jul 25, 01:40 UTCJul 25, 03:30 UTC1h 50m
2026-07-24 UAL1208 IAH → EWR Jul 24, 22:20 UTCJul 25, 00:25 UTC2h 5m
2026-07-24 UAL352 IAD → BOS Jul 24, 19:40 UTCJul 24, 20:15 UTC35m
2026-07-24 UAL1772 EWR → MYR Jul 24, 17:55 UTCJul 24, 18:25 UTC30m
2026-07-24 UAL1081 EWR → MIA Jul 24, 14:15 UTCJul 24, 16:05 UTC1h 50m
2026-07-23 UAL1282 EWR → RSW Jul 23, 23:45 UTCJul 24, 01:05 UTC1h 20m
2026-07-23 UAL1510 IAD → PHX Jul 23, 19:40 UTCJul 23, 22:05 UTC2h 25m
2026-07-23 UAL1479 IAD → EWR Jul 23, 16:00 UTCJul 23, 18:10 UTC2h 10m
2026-07-23 UAL1049 CUN → EWR Jul 23, 12:25 UTCJul 23, 14:10 UTC1h 45m
2026-07-23 UAL1913 IAH → LAS Jul 23, 06:35 UTCJul 23, 08:25 UTC1h 50m
2026-07-23 UAL1913 IAH → LAS Jul 23, 06:40 UTCJul 23, 08:23 UTC1h 43m
2026-07-22 UAL720 PHL → DEN Jul 22, 23:25 UTCJul 23, 02:10 UTC2h 45m
2026-07-22 UAL2787 GUM → SFO Jul 22, 17:31 UTCJul 22, 19:47 UTC2h 16m
2026-07-22 UAL2787 GUM → SFO Jul 22, 17:30 UTCJul 22, 19:50 UTC2h 20m
2026-07-22 UAL1235 DEN → DFW Jul 22, 13:25 UTCJul 22, 15:55 UTC2h 30m
2026-07-22 UAL1228 CVG → ORD Jul 22, 00:35 UTCJul 22, 02:40 UTC2h 5m
2026-07-21 UAL498 PDX → EWR Jul 21, 21:05 UTCJul 21, 23:00 UTC1h 55m
2026-07-21 UAL1112 BOS → DEN Jul 21, 18:05 UTCJul 21, 19:50 UTC1h 45m
2026-07-20 UAL2246 RSW → EWR Jul 20, 23:00 UTCJul 21, 05:20 UTC6h 20m
2026-07-20 UAL2049 DFW → DEN Jul 20, 17:00 UTCJul 20, 18:25 UTC1h 25m
2026-07-20 UAL2160 PHX → SFO Jul 20, 13:45 UTCJul 20, 15:15 UTC1h 30m
2026-07-20 UAL586 SJC → DEN Jul 20, 00:45 UTCJul 20, 03:00 UTC2h 15m
2026-07-19 UAL2745 HNL → SFO Jul 19, 01:50 UTCJul 19, 03:55 UTC2h 5m
2026-07-18 UAL1483 STL → DEN Jul 18, 22:30 UTCJul 19, 00:20 UTC1h 50m
2026-07-18 UAL2000 ORD → STL Jul 18, 20:45 UTCJul 18, 21:30 UTC45m
2026-07-18 UAL2000 ORD → STL Jul 18, 20:13 UTCJul 18, 21:27 UTC1h 14m
2026-07-18 UAL600 EWR → LAS Jul 18, 17:50 UTCJul 18, 18:00 UTC10m
2026-07-18 UAL600 EWR → LAS Jul 18, 16:35 UTCJul 18, 18:00 UTC1h 25m
2026-07-18 UAL600 EWR → LAS Jul 18, 16:35 UTCJul 18, 17:31 UTC56m
2026-07-18 UAL1778 EWR → SAT Jul 18, 14:15 UTCJul 18, 15:15 UTC1h 0m
2026-07-18 UAL2849 EWR → DOM Jul 18, 10:35 UTCJul 18, 12:25 UTC1h 50m
2026-07-18 UAL8204 ORD → SAT Jul 18, 03:35 UTCJul 18, 04:55 UTC1h 20m
2026-07-18 UAL2770 - Jul 18, 00:35 UTCJul 18, 01:45 UTC1h 10m
2026-07-18 UAL2770 MCI → ORD Jul 18, 00:15 UTCJul 18, 01:36 UTC1h 21m
2026-07-17 UAL1634 - Jul 17, 20:04 UTCJul 17, 21:00 UTC55m
2026-07-17 UAL364 ATL → ORD Jul 17, 14:23 UTCJul 17, 15:41 UTC1h 18m
2026-07-17 UAL364 ATL → ORD Jul 17, 14:24 UTCJul 17, 15:55 UTC1h 30m
2026-07-17 UAL1398 - Jul 17, 01:49 UTCJul 17, 03:20 UTC1h 30m
2026-07-16 UAL1357 - Jul 16, 20:09 UTCJul 16, 23:49 UTC3h 40m
2026-07-16 UAL1357 EUG → ORD Jul 16, 20:01 UTCJul 16, 23:41 UTC3h 40m
2026-07-16 UAL2483 - Jul 16, 15:14 UTCJul 16, 18:59 UTC3h 45m
2026-07-16 UAL2752 - Jul 16, 11:25 UTCJul 16, 12:25 UTC1h 0m
2026-07-16 UAL2148 ORD → CVG Jul 16, 02:50 UTCJul 16, 03:35 UTC45m
2026-07-15 UAL1564 DFW → ORD Jul 15, 23:05 UTCJul 16, 01:00 UTC1h 55m

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 N893UA page for operator, model, and routing details .

Mode-S AC523C frequently asked

What is Mode-S code AC523C?
AC523C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N893UA.
Where is Mode-S AC523C registered?
Mode-S code AC523C 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 AC523C broadcasting right now?
Yes. Mode-S AC523C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC523C, octal 53051074, decimal 11,293,244.
What flights does AC523C operate?
Mode-S AC523C has broadcast 20 distinct callsigns, including UAL2849, UAL1564, UAL364, UAL2148, UAL1634.