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
Broadcasting now · callsign UAL879 · 38,000 ft
Flights observed
121
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A20433 is currently broadcasting. Map zoomed to live position.

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 - 11 2026-06-13
UAL884 United Airlines 8 2026-06-11
UAL885 United Airlines 7 2026-06-11
UAL905 United Airlines 6 2026-05-17
UAL939 United Airlines 4 2026-05-19
UAL990 United Airlines 3 2026-06-05
UAL949 United Airlines 3 2026-05-18
UAL925 United Airlines 3 2026-06-08
UAL915 United Airlines 3 2026-06-11
UAL47 United Airlines 3 2026-05-28
UAL46 United Airlines 3 2026-05-27
UAL3875 United Airlines 3 2026-04-20
UAL34 United Airlines 3 2026-06-05
UAL23 United Airlines 3 2026-05-11
UAL22 United Airlines 3 2026-05-11
UAL194 United Airlines 3 2026-05-23
UAL160 United Airlines 3 2026-05-24
UAL969 United Airlines 2 2026-05-02
UAL943 United Airlines 2 2026-06-09
UAL942 United Airlines 2 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-13 UAL879 LHR → IAH Jun 13, 10:20 UTCJun 13, 16:45 UTC6h 25m
2026-06-13 UAL14 EWR → LHR Jun 13, 01:30 UTCJun 13, 08:05 UTC6h 34m
2026-06-12 UAL56 CDG → EWR Jun 12, 08:30 UTCJun 12, 16:00 UTC7h 30m
2026-06-11 UAL915 IAD → CDG Jun 11, 23:30 UTCJun 12, 06:30 UTC7h 0m
2026-06-11 UAL915 IAD → CDG Jun 11, 23:01 UTCJun 12, 06:26 UTC7h 25m
2026-06-11 UAL885 FCO → IAD Jun 11, 11:25 UTCJun 11, 12:45 UTC1h 20m
2026-06-11 UAL885 FCO → IAD Jun 11, 11:17 UTCJun 11, 20:28 UTC9h 11m
2026-06-11 UAL885 FCO → IAD Jun 11, 11:17 UTCJun 11, 20:22 UTC9h 5m
2026-06-11 UAL884 IAD → FCO Jun 11, 01:10 UTCJun 11, 03:15 UTC2h 5m
2026-06-11 UAL884 IAD → FCO Jun 11, 00:18 UTCJun 11, 09:14 UTC8h 56m
2026-06-10 UAL885 FCO → IAD Jun 10, 08:50 UTCJun 10, 17:55 UTC9h 5m
2026-06-10 UAL885 FCO → IAD Jun 10, 08:47 UTCJun 10, 17:53 UTC9h 6m
2026-06-09 UAL884 IAD → FCO Jun 9, 22:08 UTCJun 10, 06:24 UTC8h 16m
2026-06-09 UAL884 IAD → FCO Jun 9, 22:20 UTCJun 10, 00:35 UTC2h 15m
2026-06-09 UAL943 LIS → IAD Jun 9, 12:05 UTCJun 9, 19:15 UTC7h 10m
2026-06-09 UAL942 IAD → LIS Jun 9, 03:15 UTCJun 9, 09:50 UTC6h 35m
2026-06-08 UAL925 LHR → IAD Jun 8, 15:55 UTCJun 8, 23:05 UTC7h 10m
2026-06-08 UAL924 IAD → LHR Jun 8, 03:15 UTCJun 8, 09:50 UTC6h 35m
2026-06-07 UAL885 FCO → IAD Jun 7, 09:50 UTCJun 7, 18:45 UTC8h 55m
2026-06-06 UAL884 IAD → FCO Jun 6, 22:30 UTCJun 7, 06:30 UTC8h 0m
2026-06-06 UAL914 CDG → IAD Jun 6, 10:34 UTCJun 6, 18:19 UTC7h 45m
2026-06-05 UAL990 SFO → CDG Jun 5, 22:08 UTCJun 6, 08:06 UTC9h 58m
2026-06-05 UAL990 SFO → CDG Jun 5, 22:00 UTCJun 6, 00:45 UTC2h 45m
2026-06-05 UAL34 KIX → SFO Jun 5, 08:05 UTCJun 5, 17:40 UTC9h 35m
2026-06-04 UAL35 SFO → KIX Jun 4, 18:55 UTCJun 5, 05:45 UTC10h 50m
2026-06-03 UAL673 SFO → BOS Jun 3, 14:30 UTCJun 4, 02:10 UTC11h 40m
2026-06-03 UAL673 SFO → BOS Jun 3, 14:31 UTCJun 4, 02:04 UTC11h 33m
2026-06-03 UAL672 EWR → ATL Jun 3, 01:35 UTCJun 3, 12:15 UTC10h 40m
2026-06-02 UAL59 FRA → SFO Jun 2, 11:40 UTCJun 2, 22:30 UTC10h 50m
2026-06-02 UAL59 FRA → SFO Jun 2, 11:19 UTCJun 2, 22:23 UTC11h 4m
2026-06-01 UAL58 SFO → FRA Jun 1, 21:45 UTCJun 2, 07:55 UTC10h 10m
2026-06-01 UAL984 CDG → SFO Jun 1, 07:50 UTCJun 1, 18:15 UTC10h 25m
2026-05-31 UAL915 IAD → CDG May 31, 22:40 UTCJun 1, 05:45 UTC7h 5m
2026-05-31 UAL885 FCO → IAD May 31, 08:55 UTCMay 31, 18:05 UTC9h 10m
2026-05-30 UAL884 IAD → FCO May 30, 22:15 UTCMay 31, 00:20 UTC2h 5m
2026-05-30 UAL943 LIS → IAD May 30, 11:40 UTCMay 30, 19:10 UTC7h 30m
2026-05-30 UAL942 IAD → LIS May 30, 03:05 UTCMay 30, 09:25 UTC6h 20m
2026-05-29 UAL925 LHR → IAD May 29, 16:20 UTCMay 29, 23:35 UTC7h 15m
2026-05-29 UAL925 LHR → IAD May 29, 15:59 UTCMay 29, 23:30 UTC7h 31m
2026-05-29 UAL5 IAH → LHR May 29, 02:00 UTCMay 29, 10:50 UTC8h 50m
2026-05-28 UAL47 FRA → IAH May 28, 12:25 UTCMay 28, 14:10 UTC1h 45m
2026-05-28 UAL47 FRA → IAH May 28, 12:35 UTCMay 28, 22:21 UTC9h 46m
2026-05-27 UAL46 IAH → FRA May 27, 23:55 UTCMay 28, 09:20 UTC9h 25m
2026-05-27 UAL818 EZE → IAH May 27, 00:10 UTCMay 27, 09:50 UTC9h 40m
2026-05-26 UAL819 IAH → EZE May 26, 02:00 UTCMay 26, 11:39 UTC9h 40m
2026-05-25 UAL47 FRA → IAH May 25, 12:25 UTCMay 25, 23:04 UTC10h 39m
2026-05-25 UAL46 IAH → FRA May 25, 01:55 UTCMay 25, 08:45 UTC6h 50m
2026-05-25 UAL46 IAH → FRA May 25, 00:08 UTCMay 25, 08:51 UTC8h 43m
2026-05-24 UAL160 MUC → IAH May 24, 10:30 UTCMay 24, 21:30 UTC11h 0m
2026-05-23 UAL194 SFO → MUC May 23, 21:28 UTCMay 24, 07:56 UTC10h 28m

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?
Yes. Mode-S A20433 is currently airborne.
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, UAL884, UAL885, UAL905, UAL939.