Apparatus

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sensors Mode-S transponder

AC59AA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N895UA · AIRBUS A-319 · operated by UMB BANK NA TRUSTEE

Hex
AC59AA
Octal
53054652
Decimal
11,295,146
Country
US
Tail
N895UA
Type
A319
Broadcasting now · callsign UAL545 · 37,000 ft
Flights observed
521
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:25 UTC

Current position

AC59AA is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC59AA 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
UAL412 - 8 2026-07-14
UAL822 - 6 2026-07-14
UAL340 - 6 2026-07-16
UAL1836 - 6 2026-07-17
UAL373 - 5 2026-07-10
UAL1937 United Airlines 5 2026-05-18
UAL1612 - 5 2026-06-23
UAL1305 - 5 2026-07-16
UAL549 - 4 2026-07-12
UAL2822 United Airlines 4 2026-06-20
UAL2690 - 4 2026-07-03
UAL1942 United Airlines 4 2026-05-13
UAL1870 United Airlines 4 2026-05-21
UAL1728 - 4 2026-07-12
UAL1639 United Airlines 4 2026-06-11
UAL1521 - 4 2026-07-12
UAL1478 United Airlines 4 2026-04-20
UAL1434 - 4 2026-07-02
UAL1282 - 4 2026-07-12
UAL1095 - 4 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2680 SEA → EWR Jul 26, 20:40 UTCJul 26, 21:25 UTC45m
2026-07-26 UAL1687 MSY → SFO Jul 26, 17:30 UTCJul 26, 19:30 UTC2h 0m
2026-07-26 UAL2460 SAT → IAH Jul 26, 12:45 UTCJul 26, 15:05 UTC2h 20m
2026-07-26 UAL2378 SFO → BUR Jul 26, 01:55 UTCJul 26, 04:15 UTC2h 20m
2026-07-25 UAL448 BOS → DEN Jul 25, 20:55 UTCJul 25, 23:25 UTC2h 30m
2026-07-25 UAL1365 DFW → EWR Jul 25, 14:50 UTCJul 25, 18:00 UTC3h 10m
2026-07-25 UAL1085 MEX → IAH Jul 25, 11:00 UTCJul 25, 12:50 UTC1h 50m
2026-07-25 UAL429 IAH → MEX Jul 25, 03:00 UTCJul 25, 04:50 UTC1h 50m
2026-07-24 UAL1025 MEX → IAH Jul 24, 22:55 UTCJul 25, 00:45 UTC1h 50m
2026-07-24 UAL1090 IAH → MEX Jul 24, 19:25 UTCJul 24, 21:15 UTC1h 50m
2026-07-24 UAL425 MCO → EWR Jul 24, 15:45 UTCJul 24, 17:15 UTC1h 30m
2026-07-24 UAL425 MCO → EWR Jul 24, 15:55 UTCJul 24, 17:14 UTC1h 19m
2026-07-24 UAL1030 SAT → EWR Jul 24, 12:30 UTCJul 24, 14:10 UTC1h 40m
2026-07-24 UAL2260 PHL → ORD Jul 24, 10:30 UTCJul 24, 11:15 UTC45m
2026-07-24 UAL1183 FLL → EWR Jul 24, 02:55 UTCJul 24, 03:35 UTC40m
2026-07-23 UAL283 DFW → EWR Jul 23, 23:00 UTCJul 24, 01:15 UTC2h 15m
2026-07-23 UAL732 DEN → CVG Jul 23, 20:10 UTCJul 23, 21:35 UTC1h 25m
2026-07-23 UAL2049 EUG → SFO Jul 23, 16:55 UTCJul 23, 18:25 UTC1h 30m
2026-07-23 UAL2160 PHX → SFO Jul 23, 13:35 UTCJul 23, 15:05 UTC1h 30m
2026-07-22 UAL1602 DFW → DEN Jul 22, 00:05 UTCJul 22, 01:40 UTC1h 35m
2026-07-21 UAL1439 EWR → SFO Jul 21, 21:40 UTCJul 21, 22:30 UTC50m
2026-07-21 UAL1439 EWR → SFO Jul 21, 21:41 UTCJul 21, 22:26 UTC45m
2026-07-21 UAL1072 BJX → IAH Jul 21, 18:04 UTCJul 21, 19:32 UTC1h 28m
2026-07-21 UAL2118 IAH → BJX Jul 21, 15:05 UTCJul 21, 18:30 UTC3h 25m
2026-07-21 UAL1871 MCO → EWR Jul 21, 00:45 UTCJul 21, 01:20 UTC35m
2026-07-20 UAL1899 ORD → YYC Jul 20, 22:05 UTCJul 20, 23:50 UTC1h 45m
2026-07-20 UAL2033 RNO → SFO Jul 20, 20:25 UTCJul 20, 20:55 UTC30m
2026-07-20 UAL2045 TPA → EWR Jul 20, 18:10 UTCJul 20, 18:25 UTC15m
2026-07-20 UAL1610 ORD → LGA Jul 20, 15:30 UTCJul 20, 16:55 UTC1h 25m
2026-07-20 UAL1126 LAS → EWR Jul 20, 02:50 UTCJul 20, 04:15 UTC1h 25m
2026-07-20 UAL1835 - Jul 20, 01:00 UTCJul 20, 01:40 UTC40m
2026-07-19 UAL8103 - Jul 19, 21:05 UTCJul 19, 21:50 UTC45m
2026-07-19 UAL1541 IAH → LGA Jul 19, 18:05 UTCJul 19, 19:50 UTC1h 45m
2026-07-19 UAL456 EWR → SRQ Jul 19, 14:15 UTCJul 19, 16:00 UTC1h 45m
2026-07-18 UAL352 - Jul 18, 19:50 UTCJul 18, 20:25 UTC35m
2026-07-18 UAL1772 EWR → MYR Jul 18, 18:00 UTCJul 18, 18:25 UTC25m
2026-07-18 UAL472 - Jul 18, 14:05 UTCJul 18, 15:55 UTC1h 50m
2026-07-18 UAL2130 DEN → MEM Jul 18, 00:19 UTCJul 18, 02:09 UTC1h 50m
2026-07-17 UAL696 - Jul 17, 20:15 UTCJul 17, 22:10 UTC1h 55m
2026-07-17 UAL696 MKE → DEN Jul 17, 20:12 UTCJul 17, 22:07 UTC1h 55m
2026-07-17 UAL1836 DEN → MKE Jul 17, 16:18 UTCJul 17, 18:19 UTC2h 1m
2026-07-17 UAL1836 DEN → MKE Jul 17, 16:15 UTCJul 17, 18:25 UTC2h 10m
2026-07-17 UAL2255 - Jul 17, 14:10 UTCJul 17, 14:30 UTC20m
2026-07-17 UAL2173 - Jul 17, 01:39 UTCJul 17, 01:59 UTC20m
2026-07-17 UAL2173 DEN → HDN Jul 17, 01:35 UTCJul 17, 02:07 UTC32m
2026-07-16 UAL447 - Jul 16, 20:55 UTCJul 16, 23:20 UTC2h 25m
2026-07-16 UAL1241 - Jul 16, 16:40 UTCJul 16, 18:59 UTC2h 20m
2026-07-16 UAL340 ATL → DEN Jul 16, 11:50 UTCJul 16, 14:25 UTC2h 35m
2026-07-16 UAL340 ATL → DEN Jul 16, 11:44 UTCJul 16, 14:20 UTC2h 36m
2026-07-16 UAL1305 DEN → ATL Jul 16, 00:15 UTCJul 16, 02:55 UTC2h 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 N895UA page for operator, model, and routing details .

Mode-S AC59AA frequently asked

What is Mode-S code AC59AA?
AC59AA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N895UA.
Where is Mode-S AC59AA registered?
Mode-S code AC59AA 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 AC59AA broadcasting right now?
Yes. Mode-S AC59AA is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC59AA, octal 53054652, decimal 11,295,146.
What flights does AC59AA operate?
Mode-S AC59AA has broadcast 20 distinct callsigns, including UAL412, UAL822, UAL340, UAL1836, UAL373.