Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A533BD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N434UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A533BD
Octal
51231675
Decimal
10,826,685
Country
US
Tail
N434UA
Type
A320
No current signal · last broadcast 5h ago
Flights observed
405
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A533BD.

Country allocation

The ICAO 24-bit address A533BD 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
UAL2211 United Airlines 8 2026-05-07
UAL718 United Airlines 5 2026-06-26
UAL626 - 5 2026-06-27
UAL357 - 5 2026-06-27
UAL1708 - 5 2026-07-01
UAL8107 - 4 2026-06-27
UAL335 - 4 2026-07-02
UAL2831 - 4 2026-06-30
UAL2192 - 4 2026-07-13
UAL1580 United Airlines 4 2026-05-07
UAL1269 - 4 2026-06-23
UAL1265 - 4 2026-07-01
UAL1007 - 4 2026-06-30
UAL817 - 3 2026-06-26
UAL737 - 3 2026-07-13
UAL725 United Airlines 3 2026-05-16
UAL704 - 3 2026-06-23
UAL697 - 3 2026-06-23
UAL650 - 3 2026-04-13
UAL605 United Airlines 3 2026-04-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1613 - Jul 14, 00:35 UTCJul 14, 01:15 UTC40m
2026-07-13 UAL737 SEA → SFO Jul 13, 21:25 UTCJul 13, 23:20 UTC1h 55m
2026-07-13 UAL2192 SFO → SEA Jul 13, 18:51 UTCJul 13, 19:58 UTC1h 7m
2026-07-13 UAL2192 SFO → SEA Jul 13, 18:40 UTCJul 13, 20:05 UTC1h 25m
2026-07-13 UAL2818 PDX → SFO Jul 13, 15:45 UTCJul 13, 17:15 UTC1h 30m
2026-07-13 UAL2413 - Jul 13, 05:40 UTCJul 13, 06:50 UTC1h 10m
2026-07-13 UAL1508 BUR → SFO Jul 13, 03:40 UTCJul 13, 04:25 UTC45m
2026-07-12 UAL2764 SFO → BUR Jul 12, 23:45 UTCJul 13, 00:40 UTC55m
2026-07-12 UAL2279 PDX → SFO Jul 12, 20:55 UTCJul 12, 22:30 UTC1h 35m
2026-07-12 UAL1301 - Jul 12, 18:40 UTCJul 12, 19:15 UTC35m
2026-07-12 UAL1301 SFO → PDX Jul 12, 18:22 UTCJul 12, 19:52 UTC1h 30m
2026-07-12 UAL336 - Jul 12, 01:15 UTCJul 12, 16:50 UTC15h 35m
2026-07-11 UAL2305 - Jul 11, 22:55 UTCJul 11, 23:40 UTC45m
2026-07-11 UAL671 DEN → SBA Jul 11, 19:07 UTCJul 11, 21:02 UTC1h 55m
2026-07-11 UAL671 - Jul 11, 19:00 UTCJul 11, 21:05 UTC2h 5m
2026-07-11 UAL1925 - Jul 11, 13:20 UTCJul 11, 14:00 UTC40m
2026-07-11 UAL8154 DEN → GTF Jul 11, 03:47 UTCJul 11, 05:15 UTC1h 28m
2026-07-11 UAL8154 - Jul 11, 03:50 UTCJul 11, 04:40 UTC50m
2026-07-10 UAL2609 - Jul 10, 23:15 UTCJul 11, 02:35 UTC3h 20m
2026-07-10 UAL1633 RDU → CLT Jul 10, 20:56 UTCJul 10, 21:37 UTC41m
2026-07-10 UAL1633 - Jul 10, 20:50 UTCJul 10, 21:25 UTC35m
2026-07-10 UAL1633 DEN → RDU Jul 10, 16:25 UTCJul 10, 19:50 UTC3h 25m
2026-07-10 UAL1354 DEN → DEN Jul 10, 03:45 UTCJul 10, 14:40 UTC10h 55m
2026-07-10 UAL1262 OKC → DEN Jul 10, 00:20 UTCJul 10, 02:00 UTC1h 40m
2026-07-09 UAL2750 DEN → OKC Jul 9, 21:49 UTCJul 9, 22:43 UTC54m
2026-07-09 UAL2750 DEN → OKC Jul 9, 21:40 UTCJul 9, 22:50 UTC1h 10m
2026-07-09 UAL3868 - Jul 9, 15:15 UTCJul 9, 18:20 UTC3h 5m
2026-07-09 UAL3868 CLE → DEN Jul 9, 15:12 UTCJul 9, 18:12 UTC3h 0m
2026-07-07 UAL4212 BFI → SEA Jul 7, 13:35 UTCJul 7, 15:00 UTC1h 25m
2026-07-07 UAL4212 BFI → SEA Jul 7, 13:43 UTCJul 7, 14:55 UTC1h 12m
2026-07-05 UAL2473 DEN → TYS Jul 5, 23:45 UTCJul 6, 02:30 UTC2h 45m
2026-07-05 UAL2447 AUS → DEN Jul 5, 20:01 UTCJul 5, 22:06 UTC2h 5m
2026-07-05 UAL2447 AUS → DEN Jul 5, 20:05 UTCJul 5, 22:05 UTC2h 0m
2026-07-05 UAL1026 DEN → AUS Jul 5, 17:00 UTCJul 5, 18:35 UTC1h 35m
2026-07-05 UAL1256 - Jul 5, 13:00 UTCJul 5, 15:35 UTC2h 35m
2026-07-05 UAL1256 TYS → DEN Jul 5, 13:01 UTCJul 5, 15:34 UTC2h 33m
2026-07-04 UAL2787 DEN → TYS Jul 4, 17:19 UTCJul 4, 19:33 UTC2h 14m
2026-07-04 UAL2787 - Jul 4, 17:10 UTCJul 4, 19:15 UTC2h 5m
2026-07-04 UAL1045 - Jul 4, 14:20 UTCJul 4, 16:05 UTC1h 45m
2026-07-04 UAL1351 DEN → XNA Jul 4, 00:55 UTCJul 4, 02:20 UTC1h 25m
2026-07-03 UAL1790 EWR → MYR Jul 3, 21:15 UTCJul 3, 23:10 UTC1h 55m
2026-07-03 UAL1578 IAH → LAX Jul 3, 19:20 UTCJul 3, 20:05 UTC45m
2026-07-03 UAL336 - Jul 3, 16:00 UTCJul 3, 18:00 UTC2h 0m
2026-07-03 UAL1958 - Jul 3, 01:30 UTCJul 3, 02:55 UTC1h 25m
2026-07-02 UAL454 DFW → SFO Jul 2, 20:55 UTCJul 3, 00:05 UTC3h 10m
2026-07-02 UAL1062 - Jul 2, 16:10 UTCJul 2, 19:10 UTC3h 0m
2026-07-02 UAL335 EUG → SFO Jul 2, 13:15 UTCJul 2, 14:25 UTC1h 10m
2026-07-02 UAL8108 - Jul 2, 04:55 UTCJul 2, 06:00 UTC1h 5m
2026-07-02 UAL2164 SEA → SFO Jul 2, 01:25 UTCJul 2, 03:10 UTC1h 45m
2026-07-02 UAL2164 SEA → SFO Jul 2, 01:07 UTCJul 2, 03:05 UTC1h 58m

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 N434UA page for operator, model, and routing details .

Mode-S A533BD frequently asked

What is Mode-S code A533BD?
A533BD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N434UA.
Where is Mode-S A533BD registered?
Mode-S code A533BD 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 A533BD broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A533BD, octal 51231675, decimal 10,826,685.
What flights does A533BD operate?
Mode-S A533BD has broadcast 20 distinct callsigns, including UAL2211, UAL718, UAL626, UAL357, UAL1708.