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 Jul 26, 21:15 UTC
Flights observed
470
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

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
UAL626 - 6 2026-07-15
UAL357 - 6 2026-07-16
UAL2831 - 6 2026-07-16
UAL718 United Airlines 5 2026-06-26
UAL2602 - 5 2026-07-17
UAL1708 - 5 2026-07-01
UAL1007 United Airlines 5 2026-07-20
UAL8107 - 4 2026-06-27
UAL336 United Airlines 4 2026-07-21
UAL335 - 4 2026-07-02
UAL2192 - 4 2026-07-13
UAL1809 - 4 2026-07-18
UAL1580 United Airlines 4 2026-05-07
UAL1269 - 4 2026-06-23
UAL1265 - 4 2026-07-01
UAL817 - 3 2026-06-26
UAL737 - 3 2026-07-13
UAL725 United Airlines 3 2026-05-16
UAL704 - 3 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1762 SDF → DEN Jul 26, 19:50 UTCJul 26, 21:15 UTC1h 25m
2026-07-26 UAL2427 ORD → SXM Jul 26, 16:05 UTCJul 26, 17:55 UTC1h 50m
2026-07-26 UAL247 DTW → ORD Jul 26, 12:35 UTCJul 26, 14:10 UTC1h 35m
2026-07-26 UAL247 DTW → ORD Jul 26, 12:42 UTCJul 26, 13:54 UTC1h 12m
2026-07-26 UAL2317 EWR → AUS Jul 26, 03:20 UTCJul 26, 04:25 UTC1h 5m
2026-07-26 UAL2317 EWR → AUS Jul 26, 03:18 UTCJul 26, 04:22 UTC1h 4m
2026-07-25 UAL1476 DEN → EUG Jul 25, 23:45 UTCJul 26, 00:55 UTC1h 10m
2026-07-25 UAL2207 ORD → PIT Jul 25, 21:10 UTCJul 25, 22:10 UTC1h 0m
2026-07-25 UAL1114 SFO → ORD Jul 25, 15:00 UTCJul 25, 17:05 UTC2h 5m
2026-07-25 UAL8162 ORD → MIA Jul 25, 01:25 UTCJul 25, 03:10 UTC1h 45m
2026-07-24 UAL2738 IAD → EWR Jul 24, 21:55 UTCJul 24, 23:20 UTC1h 25m
2026-07-24 UAL2765 HND → SFO Jul 24, 18:40 UTCJul 24, 19:50 UTC1h 10m
2026-07-24 UAL2201 ONT → SFO Jul 24, 14:45 UTCJul 24, 16:15 UTC1h 30m
2026-07-24 UAL2201 ONT → SFO Jul 24, 14:43 UTCJul 24, 16:07 UTC1h 24m
2026-07-24 UAL1077 EWR → MSP Jul 24, 11:10 UTCJul 24, 12:40 UTC1h 30m
2026-07-24 UAL1077 EWR → MSP Jul 24, 11:24 UTCJul 24, 12:37 UTC1h 13m
2026-07-24 UAL1564 BOS → ORD Jul 24, 00:40 UTCJul 24, 02:30 UTC1h 50m
2026-07-23 UAL578 ORD → PHL Jul 23, 21:50 UTCJul 23, 23:15 UTC1h 25m
2026-07-23 UAL1305 EWR → RDU Jul 23, 18:50 UTCJul 23, 20:30 UTC1h 40m
2026-07-23 UAL1305 EWR → RDU Jul 23, 18:51 UTCJul 23, 20:28 UTC1h 37m
2026-07-23 UAL397 DEN → MSP Jul 23, 16:00 UTCJul 23, 17:30 UTC1h 30m
2026-07-23 UAL1003 - Jul 23, 13:55 UTCJul 23, 14:20 UTC25m
2026-07-23 UAL1003 DFW → EWR Jul 23, 13:42 UTCJul 23, 14:18 UTC36m
2026-07-23 UAL8102 YYZ → YQB Jul 23, 04:20 UTCJul 23, 04:40 UTC20m
2026-07-23 UAL1866 FLL → EWR Jul 23, 02:00 UTCJul 23, 03:10 UTC1h 10m
2026-07-23 UAL1866 FLL → EWR Jul 23, 02:07 UTCJul 23, 03:04 UTC57m
2026-07-22 UAL1866 FLL → EWR Jul 22, 20:35 UTCJul 23, 00:15 UTC3h 40m
2026-07-22 UAL1786 LAX → CLE Jul 22, 16:35 UTCJul 22, 19:15 UTC2h 40m
2026-07-22 UAL1846 ORD → CMH Jul 22, 12:10 UTCJul 22, 14:55 UTC2h 45m
2026-07-22 UAL1220 DEN → DTW Jul 22, 00:25 UTCJul 22, 02:50 UTC2h 25m
2026-07-21 UAL1942 MSY → SFO Jul 21, 20:25 UTCJul 21, 22:30 UTC2h 5m
2026-07-21 UAL1942 MSY → SFO Jul 21, 20:17 UTCJul 21, 22:27 UTC2h 10m
2026-07-21 UAL790 DEN → AUS Jul 21, 18:00 UTCJul 21, 19:05 UTC1h 5m
2026-07-21 UAL336 SFO → EWR Jul 21, 15:00 UTCJul 21, 16:45 UTC1h 45m
2026-07-21 UAL8158 SFO → RDU Jul 21, 01:40 UTCJul 21, 03:00 UTC1h 20m
2026-07-20 UAL1482 SAT → SFO Jul 20, 19:30 UTCJul 20, 21:15 UTC1h 45m
2026-07-20 UAL1007 ORD → ALB Jul 20, 04:15 UTCJul 20, 05:40 UTC1h 25m
2026-07-19 UAL436 SFO → BWI Jul 19, 22:15 UTCJul 20, 02:55 UTC4h 40m
2026-07-19 UAL2836 - Jul 19, 15:45 UTCJul 19, 20:15 UTC4h 30m
2026-07-19 UAL2836 SFO → PIT Jul 19, 15:45 UTCJul 19, 20:13 UTC4h 28m
2026-07-18 UAL702 - Jul 18, 22:10 UTCJul 18, 23:35 UTC1h 25m
2026-07-18 UAL1809 SFO → RDM Jul 18, 06:15 UTCJul 18, 07:06 UTC51m
2026-07-18 UAL1809 SFO → RDM Jul 18, 06:05 UTCJul 18, 07:10 UTC1h 5m
2026-07-18 UAL649 SFO → EWR Jul 18, 02:50 UTCJul 18, 04:45 UTC1h 55m
2026-07-17 UAL2602 DEN → BOI Jul 17, 23:06 UTCJul 18, 00:36 UTC1h 30m
2026-07-17 UAL2602 - Jul 17, 23:10 UTCJul 18, 00:39 UTC1h 30m
2026-07-17 UAL248 BOS → IAH Jul 17, 18:55 UTCJul 17, 20:29 UTC1h 35m
2026-07-17 UAL355 DEN → DFW Jul 17, 16:00 UTCJul 17, 17:30 UTC1h 30m
2026-07-17 UAL1354 DEN → DEN Jul 17, 02:10 UTCJul 17, 13:45 UTC11h 35m
2026-07-16 UAL562 - Jul 16, 19:40 UTCJul 16, 23:59 UTC4h 20m

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 Jul 26, 21:15 UTC.
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, UAL626, UAL357, UAL2831, UAL718.