Apparatus

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sensors Mode-S transponder

AB890A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N842UA · AIRBUS A-319 · operated by UNITED AIRLINES INC

Hex
AB890A
Octal
52704412
Decimal
11,241,738
Country
US
Tail
N842UA
Type
A319
Broadcasting now · callsign UAL581 · 37,550 ft
Flights observed
552
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Current position

AB890A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AB890A 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
UAL2465 United Airlines 6 2026-05-18
UAL393 - 5 2026-07-17
UAL340 United Airlines 5 2026-06-12
UAL2394 United Airlines 5 2026-05-14
UAL1322 - 5 2026-07-17
UAL793 United Airlines 4 2026-07-25
UAL786 United Airlines 4 2026-06-08
UAL654 United Airlines 4 2026-04-28
UAL652 - 4 2026-06-23
UAL600 United Airlines 4 2026-07-23
UAL570 - 4 2026-07-13
UAL516 - 4 2026-07-07
UAL471 - 4 2026-07-07
UAL456 - 4 2026-06-29
UAL408 United Airlines 4 2026-05-14
UAL2483 - 4 2026-07-01
UAL2321 United Airlines 4 2026-04-17
UAL2079 - 4 2026-07-16
UAL1842 United Airlines 4 2026-05-26
UAL1778 United Airlines 4 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL622 LAX → ORD Jul 26, 19:00 UTCJul 26, 21:05 UTC2h 5m
2026-07-26 UAL705 PVR → SFO Jul 26, 15:10 UTCJul 26, 16:20 UTC1h 10m
2026-07-26 UAL2753 LAX → SFO Jul 26, 12:45 UTCJul 26, 13:50 UTC1h 5m
2026-07-26 UAL1517 BNA → EWR Jul 26, 00:40 UTCJul 26, 02:45 UTC2h 5m
2026-07-25 UAL793 SFO → ORD Jul 25, 21:30 UTCJul 25, 23:15 UTC1h 45m
2026-07-25 UAL793 SFO → ORD Jul 25, 21:16 UTCJul 25, 23:13 UTC1h 57m
2026-07-25 UAL1107 SAN → SFO Jul 25, 18:25 UTCJul 25, 19:15 UTC50m
2026-07-25 UAL1107 SAN → SFO Jul 25, 18:12 UTCJul 25, 18:58 UTC46m
2026-07-25 UAL365 STT → ORD Jul 25, 16:06 UTCJul 25, 16:40 UTC34m
2026-07-25 UAL365 STT → ORD Jul 25, 16:00 UTCJul 25, 16:40 UTC40m
2026-07-25 UAL2287 ORD → SAN Jul 25, 13:25 UTCJul 25, 14:20 UTC55m
2026-07-25 UAL1839 SAN → DEN Jul 25, 02:55 UTCJul 25, 03:45 UTC50m
2026-07-25 UAL1839 SAN → DEN Jul 25, 02:58 UTCJul 25, 03:45 UTC47m
2026-07-24 UAL2148 EWR → SAT Jul 24, 22:40 UTCJul 25, 00:20 UTC1h 40m
2026-07-24 UAL2148 EWR → SAT Jul 24, 22:37 UTCJul 25, 00:12 UTC1h 35m
2026-07-24 UAL1314 EWR → JAX Jul 24, 19:40 UTCJul 24, 21:05 UTC1h 25m
2026-07-24 UAL1660 ANC → EWR Jul 24, 15:45 UTCJul 24, 16:15 UTC30m
2026-07-24 UAL2093 - Jul 24, 14:10 UTCJul 24, 14:35 UTC25m
2026-07-24 UAL2093 ORD → MSN Jul 24, 14:10 UTCJul 24, 14:33 UTC23m
2026-07-23 UAL1531 ORD → CMH Jul 23, 21:35 UTCJul 23, 22:25 UTC50m
2026-07-23 UAL1531 ORD → CMH Jul 23, 21:22 UTCJul 23, 22:11 UTC49m
2026-07-23 UAL2749 LAS → SFO Jul 23, 19:15 UTCJul 23, 20:15 UTC1h 0m
2026-07-23 UAL600 EWR → LAS Jul 23, 16:40 UTCJul 23, 17:50 UTC1h 10m
2026-07-23 UAL600 EWR → LAS Jul 23, 16:35 UTCJul 23, 17:31 UTC56m
2026-07-23 UAL1778 EWR → SAT Jul 23, 14:00 UTCJul 23, 15:05 UTC1h 5m
2026-07-23 UAL1778 EWR → SAT Jul 23, 14:10 UTCJul 23, 15:05 UTC55m
2026-07-23 UAL1486 DEN → FAT Jul 23, 11:25 UTCJul 23, 12:10 UTC45m
2026-07-23 UAL1486 DEN → FAT Jul 23, 11:32 UTCJul 23, 12:04 UTC32m
2026-07-22 UAL2790 BWI → EWR Jul 22, 23:30 UTCJul 23, 00:05 UTC35m
2026-07-22 UAL2790 BWI → EWR Jul 22, 23:43 UTCJul 23, 00:23 UTC40m
2026-07-22 UAL533 TPA → EWR Jul 22, 21:30 UTCJul 22, 22:10 UTC40m
2026-07-22 UAL533 TPA → EWR Jul 22, 21:25 UTCJul 22, 21:49 UTC24m
2026-07-22 UAL580 BTV → ORD Jul 22, 19:35 UTCJul 22, 20:05 UTC30m
2026-07-22 UAL1660 ANC → EWR Jul 22, 16:00 UTCJul 22, 16:35 UTC35m
2026-07-22 UAL2093 - Jul 22, 13:50 UTCJul 22, 14:15 UTC25m
2026-07-22 UAL2849 EWR → DOM Jul 22, 11:10 UTCJul 22, 12:25 UTC1h 15m
2026-07-22 UAL1504 ORD → DCA Jul 22, 00:00 UTCJul 22, 01:25 UTC1h 25m
2026-07-21 UAL2680 - Jul 21, 21:00 UTCJul 21, 21:40 UTC40m
2026-07-21 UAL2680 IND → ORD Jul 21, 20:58 UTCJul 21, 21:21 UTC23m
2026-07-21 UAL1687 MSY → SFO Jul 21, 17:30 UTCJul 21, 19:25 UTC1h 55m
2026-07-21 UAL1586 DEN → LGA Jul 21, 15:07 UTCJul 21, 15:35 UTC28m
2026-07-21 UAL1586 DEN → LGA Jul 21, 14:55 UTCJul 21, 15:35 UTC40m
2026-07-21 UAL358 SFO → LAS Jul 21, 12:35 UTCJul 21, 13:20 UTC45m
2026-07-21 UAL2744 MCO → EWR Jul 21, 10:25 UTCJul 21, 11:20 UTC55m
2026-07-20 UAL2140 SFO → IAH Jul 20, 23:50 UTCJul 21, 00:45 UTC55m
2026-07-20 UAL404 SFO → DEN Jul 20, 21:35 UTCJul 20, 22:20 UTC45m
2026-07-20 UAL515 EWR → SAT Jul 20, 16:30 UTCJul 20, 19:40 UTC3h 10m
2026-07-20 UAL2233 SNA → EWR Jul 20, 11:45 UTCJul 20, 15:10 UTC3h 25m
2026-07-20 UAL2233 SNA → EWR Jul 20, 11:39 UTCJul 20, 15:15 UTC3h 36m
2026-07-20 UAL2198 - Jul 20, 03:30 UTCJul 20, 04:05 UTC35m

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 N842UA page for operator, model, and routing details .

Mode-S AB890A frequently asked

What is Mode-S code AB890A?
AB890A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N842UA.
Where is Mode-S AB890A registered?
Mode-S code AB890A 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 AB890A broadcasting right now?
Yes. Mode-S AB890A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB890A, octal 52704412, decimal 11,241,738.
What flights does AB890A operate?
Mode-S AB890A has broadcast 20 distinct callsigns, including UAL2465, UAL393, UAL340, UAL2394, UAL1322.