Apparatus

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sensors Mode-S transponder

A89234

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N651UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A89234
Octal
52111064
Decimal
11,047,476
Country
US
Tail
N651UA
Type
B763
Broadcasting now · callsign UAL53 · 34,000 ft
Flights observed
159
Distinct callsigns
20
Country
US
Last broadcast
36m ago

Current position

A89234 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A89234 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
UAL855 United Airlines 23 2026-05-22
UAL854 United Airlines 21 2026-05-21
UAL128 - 19 2026-07-11
UAL946 - 14 2026-07-08
UAL129 - 13 2026-07-10
UAL21 - 12 2026-07-09
UAL20 - 11 2026-07-12
UAL947 - 9 2026-07-12
UAL53 - 9 2026-07-14
UAL52 - 9 2026-07-13
UAL127 United Airlines 4 2026-05-31
UAL749 United Airlines 3 2026-04-25
UAL126 United Airlines 3 2026-05-31
UAL748 United Airlines 2 2026-04-24
UAL992 United Airlines 1 2026-05-09
UAL991 United Airlines 1 2026-05-10
UAL3929 - 1 2026-07-03
UAL322 United Airlines 1 2026-05-28
UAL321 United Airlines 1 2026-05-27
UAL261 United Airlines 1 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL53 - Jul 14, 10:35 UTCJul 14, 11:00 UTC25m
2026-07-13 UAL52 IAD → ZRH Jul 13, 22:10 UTCJul 14, 06:05 UTC7h 55m
2026-07-13 UAL53 ZRH → IAD Jul 13, 10:20 UTCJul 13, 18:45 UTC8h 25m
2026-07-12 UAL52 IAD → ZRH Jul 12, 22:03 UTCJul 13, 06:40 UTC8h 37m
2026-07-12 UAL52 IAD → ZRH Jul 12, 22:40 UTCJul 13, 06:50 UTC8h 10m
2026-07-12 UAL947 AMS → IAD Jul 12, 09:35 UTCJul 12, 17:25 UTC7h 50m
2026-07-12 UAL20 - Jul 12, 05:30 UTCJul 12, 07:10 UTC1h 40m
2026-07-11 UAL20 - Jul 11, 21:55 UTCJul 12, 01:50 UTC3h 55m
2026-07-11 UAL128 - Jul 11, 01:20 UTCJul 11, 10:35 UTC9h 15m
2026-07-11 UAL128 - Jul 11, 00:25 UTCJul 11, 00:35 UTC10m
2026-07-10 UAL129 - Jul 10, 01:45 UTCJul 10, 11:20 UTC9h 35m
2026-07-10 UAL129 IAH → GIG Jul 10, 01:33 UTCJul 10, 11:16 UTC9h 43m
2026-07-09 UAL21 - Jul 9, 09:20 UTCJul 9, 19:40 UTC10h 20m
2026-07-08 UAL946 IAD → AMS Jul 8, 22:15 UTCJul 9, 05:30 UTC7h 15m
2026-07-08 UAL946 IAD → AMS Jul 8, 21:53 UTCJul 9, 05:19 UTC7h 26m
2026-07-08 UAL947 - Jul 8, 11:10 UTCJul 8, 19:00 UTC7h 50m
2026-07-07 UAL20 - Jul 7, 22:25 UTCJul 8, 07:45 UTC9h 20m
2026-07-07 UAL128 - Jul 7, 01:40 UTCJul 7, 10:45 UTC9h 5m
2026-07-06 UAL129 - Jul 6, 01:30 UTCJul 6, 11:00 UTC9h 30m
2026-07-06 UAL129 IAH → GIG Jul 6, 01:36 UTCJul 6, 11:02 UTC9h 26m
2026-07-05 UAL128 - Jul 5, 00:35 UTCJul 5, 10:10 UTC9h 35m
2026-07-04 UAL129 - Jul 4, 01:35 UTCJul 4, 11:20 UTC9h 45m
2026-07-03 UAL3929 - Jul 3, 02:30 UTCJul 3, 11:45 UTC9h 15m
2026-06-06 UAL129 IAH → GIG Jun 6, 01:25 UTCJun 6, 10:45 UTC9h 20m
2026-06-05 UAL21 AMS → IAH Jun 5, 09:25 UTCJun 5, 19:55 UTC10h 30m
2026-06-04 UAL20 IAH → AMS Jun 4, 22:00 UTCJun 5, 07:00 UTC9h 0m
2026-06-04 UAL20 IAH → AMS Jun 4, 21:57 UTCJun 5, 06:51 UTC8h 54m
2026-06-04 UAL128 GIG → IAH Jun 4, 10:10 UTCJun 4, 10:35 UTC25m
2026-06-04 UAL128 GIG → IAH Jun 4, 00:25 UTCJun 4, 07:55 UTC7h 30m
2026-06-04 UAL128 GIG → IAH Jun 4, 00:26 UTCJun 4, 10:36 UTC10h 10m
2026-06-03 UAL129 IAH → GIG Jun 3, 01:55 UTCJun 3, 07:00 UTC5h 5m
2026-06-03 UAL129 IAH → GIG Jun 3, 01:46 UTCJun 3, 11:25 UTC9h 39m
2026-06-02 UAL21 AMS → IAH Jun 2, 09:25 UTCJun 2, 18:58 UTC9h 33m
2026-06-02 UAL21 AMS → IAH Jun 2, 09:25 UTCJun 2, 18:49 UTC9h 24m
2026-06-02 UAL21 AMS → IAH Jun 2, 09:25 UTCJun 2, 10:35 UTC1h 10m
2026-06-01 UAL946 IAD → AMS Jun 1, 21:53 UTCJun 2, 05:19 UTC7h 26m
2026-06-01 UAL946 IAD → AMS Jun 1, 22:10 UTCJun 2, 05:15 UTC7h 5m
2026-05-31 UAL127 DUB → IAD May 31, 13:40 UTCMay 31, 23:00 UTC9h 20m
2026-05-31 UAL126 IAD → DUB May 31, 08:25 UTCMay 31, 11:00 UTC2h 35m
2026-05-30 UAL127 DUB → IAD May 30, 13:50 UTCMay 30, 23:25 UTC9h 35m
2026-05-30 UAL126 IAD → DUB May 30, 03:00 UTCMay 30, 11:20 UTC8h 20m
2026-05-29 UAL127 DUB → IAD May 29, 13:45 UTCMay 29, 23:00 UTC9h 15m
2026-05-29 UAL127 DUB → IAD May 29, 13:47 UTCMay 29, 22:58 UTC9h 11m
2026-05-29 UAL126 IAD → DUB May 29, 03:00 UTCMay 29, 11:20 UTC8h 20m
2026-05-28 UAL322 BOI → DEN May 28, 08:15 UTCMay 28, 17:15 UTC9h 0m
2026-05-27 UAL321 ATL → EWR May 27, 21:40 UTCMay 28, 05:40 UTC8h 0m
2026-05-27 UAL947 AMS → IAD May 27, 10:35 UTCMay 27, 18:30 UTC7h 55m
2026-05-26 UAL20 IAH → AMS May 26, 22:25 UTCMay 27, 07:35 UTC9h 10m
2026-05-26 UAL128 GIG → IAH May 26, 02:39 UTCMay 26, 10:14 UTC7h 35m
2026-05-26 UAL128 GIG → IAH May 26, 00:24 UTCMay 26, 00:35 UTC10m

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 N651UA page for operator, model, and routing details .

Mode-S A89234 frequently asked

What is Mode-S code A89234?
A89234 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N651UA.
Where is Mode-S A89234 registered?
Mode-S code A89234 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 A89234 broadcasting right now?
Yes. Mode-S A89234 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A89234, octal 52111064, decimal 11,047,476.
What flights does A89234 operate?
Mode-S A89234 has broadcast 20 distinct callsigns, including UAL855, UAL854, UAL128, UAL946, UAL129.