Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A20433

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N229UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
A20433
Octal
50402063
Decimal
10,617,907
Country
US
Tail
N229UA
Type
B772
No current signal · last broadcast 2d ago
Flights observed
213
Distinct callsigns
20
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A20433.

Country allocation

The ICAO 24-bit address A20433 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
UAL14 - 12 2026-07-17
UAL942 United Airlines 9 2026-07-24
UAL885 United Airlines 9 2026-07-26
UAL884 United Airlines 9 2026-07-25
UAL194 United Airlines 9 2026-07-18
UAL905 - 7 2026-07-17
UAL160 United Airlines 7 2026-07-19
UAL943 United Airlines 6 2026-07-24
UAL46 United Airlines 6 2026-07-20
UAL990 - 5 2026-06-27
UAL880 - 5 2026-07-13
UAL879 - 5 2026-07-13
UAL5 United Airlines 5 2026-07-22
UAL47 - 5 2026-07-21
UAL35 - 5 2026-06-26
UAL34 - 5 2026-06-27
UAL195 United Airlines 5 2026-07-02
UAL949 - 4 2026-06-15
UAL939 United Airlines 4 2026-05-19
UAL925 United Airlines 4 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL885 FCO → IAD Jul 26, 08:50 UTCJul 26, 18:10 UTC9h 20m
2026-07-26 UAL885 FCO → IAD Jul 26, 08:47 UTCJul 26, 18:03 UTC9h 16m
2026-07-25 UAL884 IAD → FCO Jul 25, 22:05 UTCJul 26, 06:10 UTC8h 5m
2026-07-25 UAL919 LHR → IAD Jul 25, 11:35 UTCJul 25, 18:55 UTC7h 20m
2026-07-24 UAL918 IAD → LHR Jul 24, 23:50 UTCJul 25, 06:30 UTC6h 40m
2026-07-24 UAL943 LIS → IAD Jul 24, 11:40 UTCJul 24, 18:45 UTC7h 5m
2026-07-24 UAL942 IAD → LIS Jul 24, 03:00 UTCJul 24, 09:35 UTC6h 35m
2026-07-23 UAL943 LIS → IAD Jul 23, 11:45 UTCJul 23, 19:00 UTC7h 15m
2026-07-23 UAL942 IAD → LIS Jul 23, 02:53 UTCJul 23, 09:29 UTC6h 36m
2026-07-23 UAL942 IAD → LIS Jul 23, 03:05 UTCJul 23, 04:45 UTC1h 40m
2026-07-22 UAL925 LHR → IAD Jul 22, 16:40 UTCJul 23, 00:05 UTC7h 25m
2026-07-22 UAL5 IAH → LHR Jul 22, 02:00 UTCJul 22, 10:25 UTC8h 25m
2026-07-22 UAL5 IAH → LHR Jul 22, 01:56 UTCJul 22, 10:45 UTC8h 49m
2026-07-21 UAL47 - Jul 21, 12:10 UTCJul 21, 22:30 UTC10h 20m
2026-07-20 UAL46 IAH → FRA Jul 20, 23:50 UTCJul 21, 09:00 UTC9h 10m
2026-07-19 UAL160 MUC → IAH Jul 19, 10:50 UTCJul 19, 21:05 UTC10h 15m
2026-07-18 UAL194 SFO → MUC Jul 18, 22:13 UTCJul 19, 08:27 UTC10h 14m
2026-07-18 UAL194 SFO → MUC Jul 18, 22:05 UTCJul 19, 00:35 UTC2h 30m
2026-07-17 UAL2328 EWR → SFO Jul 17, 19:09 UTCJul 18, 00:35 UTC5h 25m
2026-07-17 UAL905 LHR → EWR Jul 17, 08:54 UTCJul 17, 15:44 UTC6h 50m
2026-07-17 UAL14 EWR → LHR Jul 17, 00:20 UTCJul 17, 06:50 UTC6h 30m
2026-07-16 UAL56 - Jul 16, 08:05 UTCJul 16, 15:40 UTC7h 35m
2026-07-15 UAL915 IAD → CDG Jul 15, 22:35 UTCJul 16, 05:50 UTC7h 15m
2026-07-15 UAL943 LIS → IAD Jul 15, 11:40 UTCJul 15, 19:20 UTC7h 40m
2026-07-15 UAL942 IAD → LIS Jul 15, 03:15 UTCJul 15, 09:40 UTC6h 25m
2026-07-14 UAL919 - Jul 14, 11:55 UTCJul 14, 19:00 UTC7h 5m
2026-07-13 UAL880 - Jul 13, 23:00 UTCJul 14, 08:15 UTC9h 15m
2026-07-13 UAL879 - Jul 13, 10:05 UTCJul 13, 19:45 UTC9h 40m
2026-07-12 UAL880 - Jul 12, 21:40 UTCJul 13, 06:35 UTC8h 55m
2026-07-12 UAL879 - Jul 12, 09:50 UTCJul 12, 19:01 UTC9h 10m
2026-07-11 UAL880 - Jul 11, 21:45 UTCJul 12, 06:40 UTC8h 55m
2026-07-11 UAL818 - Jul 11, 00:10 UTCJul 11, 10:00 UTC9h 50m
2026-07-10 UAL819 - Jul 10, 02:50 UTCJul 10, 10:55 UTC8h 5m
2026-07-10 UAL819 - Jul 10, 01:45 UTCJul 10, 02:00 UTC15m
2026-07-09 UAL160 - Jul 9, 11:45 UTCJul 9, 12:45 UTC1h 0m
2026-07-09 UAL160 MUC → IAH Jul 9, 11:49 UTCJul 9, 22:12 UTC10h 23m
2026-07-08 UAL194 SFO → MUC Jul 8, 23:23 UTCJul 9, 09:44 UTC10h 21m
2026-07-08 UAL194 - Jul 8, 23:15 UTCJul 9, 08:45 UTC9h 30m
2026-07-07 UAL506 - Jul 7, 14:20 UTCJul 8, 02:30 UTC12h 10m
2026-07-07 UAL506 FCO → SFO Jul 7, 14:07 UTCJul 8, 02:23 UTC12h 16m
2026-07-07 UAL507 - Jul 7, 09:45 UTCJul 7, 11:30 UTC1h 45m
2026-07-07 UAL507 - Jul 7, 00:35 UTCJul 7, 09:40 UTC9h 5m
2026-07-05 UAL984 - Jul 5, 07:30 UTCJul 5, 18:35 UTC11h 5m
2026-07-04 UAL57 EWR → CDG Jul 4, 22:00 UTCJul 5, 04:25 UTC6h 25m
2026-07-04 UAL1141 SFO → EWR Jul 4, 06:06 UTCJul 4, 10:54 UTC4h 48m
2026-07-04 UAL1141 SFO → EWR Jul 4, 06:05 UTCJul 4, 11:00 UTC4h 55m
2026-07-03 UAL2328 EWR → SFO Jul 3, 19:15 UTCJul 4, 00:30 UTC5h 15m
2026-07-03 UAL1141 SFO → EWR Jul 3, 06:55 UTCJul 3, 11:50 UTC4h 55m
2026-07-02 UAL195 MUC → SFO Jul 2, 10:30 UTCJul 2, 12:25 UTC1h 55m
2026-07-02 UAL195 MUC → SFO Jul 2, 10:26 UTCJul 2, 21:22 UTC10h 56m

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 N229UA page for operator, model, and routing details .

Mode-S A20433 frequently asked

What is Mode-S code A20433?
A20433 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N229UA.
Where is Mode-S A20433 registered?
Mode-S code A20433 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 A20433 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A20433, octal 50402063, decimal 10,617,907.
What flights does A20433 operate?
Mode-S A20433 has broadcast 20 distinct callsigns, including UAL14, UAL942, UAL885, UAL884, UAL194.