Apparatus

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sensors Mode-S transponder

A3A084

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N33264 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A3A084
Octal
50720204
Decimal
10,723,460
Country
US
Tail
N33264
Type
B738
No current signal · last broadcast 4h ago
Flights observed
223
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A3A084.

Country allocation

The ICAO 24-bit address A3A084 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
UAL837 - 33 2026-07-11
UAL838 - 32 2026-07-12
UAL33 - 19 2026-07-11
UAL32 - 19 2026-07-10
UAL849 - 12 2026-07-13
UAL865 - 10 2026-06-29
UAL848 - 9 2026-07-13
UAL197 - 9 2026-07-12
UAL196 - 8 2026-07-09
UAL151 - 7 2026-07-14
UAL873 - 6 2026-07-14
UAL158 - 6 2026-07-01
UAL136 United Airlines 6 2026-06-08
UAL864 - 5 2026-06-27
UAL192 United Airlines 5 2026-05-22
UAL183 United Airlines 4 2026-06-08
UAL157 - 4 2026-07-01
UAL143 United Airlines 4 2026-06-24
UAL142 United Airlines 4 2026-06-25
UAL137 - 4 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL873 GUM → NRT Jul 14, 06:58 UTCJul 14, 10:13 UTC3h 15m
2026-07-14 UAL873 KIX → NRT Jul 14, 02:05 UTCJul 14, 10:25 UTC8h 20m
2026-07-14 UAL151 - Jul 14, 00:30 UTCJul 14, 00:40 UTC10m
2026-07-13 UAL848 - Jul 13, 14:45 UTCJul 13, 15:35 UTC50m
2026-07-13 UAL849 - Jul 13, 02:40 UTCJul 13, 12:55 UTC10h 15m
2026-07-13 UAL137 - Jul 13, 00:25 UTCJul 13, 00:35 UTC10m
2026-07-12 UAL137 GUM → NGO Jul 12, 21:43 UTCJul 13, 00:44 UTC3h 1m
2026-07-12 UAL197 - Jul 12, 08:30 UTCJul 12, 09:05 UTC35m
2026-07-12 UAL838 - Jul 12, 01:55 UTCJul 12, 02:20 UTC25m
2026-07-12 UAL838 KHH → NRT Jul 12, 02:08 UTCJul 12, 05:31 UTC3h 23m
2026-07-11 UAL837 - Jul 11, 09:30 UTCJul 11, 10:05 UTC35m
2026-07-11 UAL837 NRT → KHH Jul 11, 09:22 UTCJul 11, 13:21 UTC3h 59m
2026-07-11 UAL33 CEB → NRT Jul 11, 01:51 UTCJul 11, 05:54 UTC4h 3m
2026-07-10 UAL32 - Jul 10, 09:25 UTCJul 10, 10:00 UTC35m
2026-07-10 UAL32 NRT → CEB Jul 10, 09:22 UTCJul 10, 14:00 UTC4h 38m
2026-07-09 UAL196 HND → NRT Jul 9, 14:45 UTCJul 10, 05:35 UTC14h 50m
2026-07-09 UAL849 - Jul 9, 11:50 UTCJul 9, 12:55 UTC1h 5m
2026-07-07 UAL848 - Jul 7, 17:00 UTCJul 7, 17:25 UTC25m
2026-07-07 UAL849 - Jul 7, 07:35 UTCJul 7, 15:05 UTC7h 30m
2026-07-04 UAL3048 - Jul 4, 23:20 UTCJul 4, 23:40 UTC20m
2026-07-01 UAL158 - Jul 1, 16:55 UTCJul 1, 17:05 UTC10m
2026-07-01 UAL157 - Jul 1, 15:05 UTCJul 1, 15:30 UTC25m
2026-06-30 UAL848 - Jun 30, 14:50 UTCJun 30, 15:30 UTC40m
2026-06-30 UAL849 - Jun 30, 12:15 UTCJun 30, 13:00 UTC45m
2026-06-30 UAL849 GUM → HND Jun 30, 09:44 UTCJun 30, 13:04 UTC3h 20m
2026-06-29 UAL865 - Jun 29, 07:59 UTCJun 29, 08:35 UTC35m
2026-06-29 UAL838 KHH → NRT Jun 29, 02:05 UTCJun 29, 05:24 UTC3h 20m
2026-06-28 UAL837 SFO → NRT Jun 28, 09:55 UTCJun 28, 13:19 UTC3h 25m
2026-06-27 UAL33 - Jun 27, 11:04 UTCJun 28, 05:49 UTC18h 45m
2026-06-27 UAL32 - Jun 27, 09:55 UTCJun 28, 05:49 UTC19h 55m
2026-06-27 UAL864 - Jun 27, 05:39 UTCJun 27, 06:30 UTC50m
2026-06-26 UAL865 - Jun 26, 08:00 UTCJun 26, 08:34 UTC35m
2026-06-26 UAL838 KHH → NRT Jun 26, 02:08 UTCJun 26, 05:25 UTC3h 17m
2026-06-26 UAL838 - Jun 26, 02:09 UTCJun 26, 02:54 UTC45m
2026-06-25 UAL837 SFO → NRT Jun 25, 09:10 UTCJun 25, 12:44 UTC3h 35m
2026-06-25 UAL142 NRT → DEN Jun 25, 05:39 UTCJun 25, 06:30 UTC50m
2026-06-25 UAL142 NRT → DEN Jun 25, 01:59 UTCJun 25, 02:10 UTC10m
2026-06-24 UAL143 DEN → NRT Jun 24, 08:09 UTCJun 24, 08:49 UTC40m
2026-06-24 UAL143 DEN → NRT Jun 24, 08:12 UTCJun 24, 12:23 UTC4h 11m
2026-06-24 UAL838 KHH → NRT Jun 24, 02:09 UTCJun 24, 05:34 UTC3h 25m
2026-06-23 UAL837 SFO → NRT Jun 23, 09:05 UTCJun 23, 12:29 UTC3h 25m
2026-06-23 UAL196 - Jun 23, 05:15 UTCJun 23, 05:54 UTC40m
2026-06-23 UAL196 GUM → NRT Jun 23, 02:44 UTCJun 23, 05:51 UTC3h 7m
2026-06-22 UAL158 - Jun 22, 17:00 UTCJun 22, 17:10 UTC10m
2026-06-22 UAL158 ROR → GUM Jun 22, 17:13 UTCJun 22, 18:40 UTC1h 27m
2026-06-22 UAL157 GUM → ROR Jun 22, 15:10 UTCJun 22, 15:35 UTC25m
2026-06-17 UAL197 - Jun 17, 08:25 UTCJun 17, 09:00 UTC35m
2026-06-17 UAL197 NRT → GUM Jun 17, 08:27 UTCJun 17, 11:36 UTC3h 9m
2026-06-17 UAL838 KHH → NRT Jun 17, 02:00 UTCJun 17, 05:20 UTC3h 20m
2026-06-16 UAL837 SFO → NRT Jun 16, 09:25 UTCJun 16, 12:55 UTC3h 30m

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 N33264 page for operator, model, and routing details .

Mode-S A3A084 frequently asked

What is Mode-S code A3A084?
A3A084 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N33264.
Where is Mode-S A3A084 registered?
Mode-S code A3A084 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 A3A084 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3A084, octal 50720204, decimal 10,723,460.
What flights does A3A084 operate?
Mode-S A3A084 has broadcast 20 distinct callsigns, including UAL837, UAL838, UAL33, UAL32, UAL849.