Apparatus

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sensors Mode-S transponder

A9D605

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N73283 · BOEING 737-800 · operated by UMB BANK NA TRUSTEE

Hex
A9D605
Octal
52353005
Decimal
11,130,373
Country
US
Tail
N73283
Type
B738
No current signal · last broadcast 4h ago
Flights observed
91
Distinct callsigns
14
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A9D605.

Country allocation

The ICAO 24-bit address A9D605 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 14 distinct

Callsign Airline Flights Last seen
UAL873 United Airlines 15 2026-06-01
UAL827 United Airlines 13 2026-06-02
UAL157 United Airlines 9 2026-05-27
UAL183 United Airlines 8 2026-05-31
UAL136 United Airlines 8 2026-05-25
UAL166 United Airlines 7 2026-05-30
UAL158 United Airlines 7 2026-05-27
UAL184 United Airlines 6 2026-06-02
UAL165 United Airlines 5 2026-05-30
UAL192 United Airlines 4 2026-05-26
UAL151 United Airlines 4 2026-05-31
UAL137 United Airlines 3 2026-06-01
UAL193 United Airlines 1 2026-06-02
UAL150 United Airlines 1 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 UAL184 MNL → GUM Jun 2, 16:20 UTCJun 2, 16:40 UTC20m
2026-06-02 UAL193 ROR → MNL Jun 2, 12:00 UTCJun 2, 14:20 UTC2h 20m
2026-06-02 UAL827 NRT → GUM Jun 2, 02:20 UTCJun 2, 11:00 UTC8h 40m
2026-06-01 UAL873 GUM → NRT Jun 1, 02:40 UTCJun 1, 10:50 UTC8h 10m
2026-06-01 UAL137 GUM → NGO Jun 1, 00:25 UTCJun 1, 00:35 UTC10m
2026-05-31 UAL184 MNL → GUM May 31, 14:50 UTCMay 31, 18:00 UTC3h 10m
2026-05-31 UAL184 MNL → GUM May 31, 14:55 UTCMay 31, 15:25 UTC30m
2026-05-31 UAL183 GUM → MNL May 31, 12:00 UTCMay 31, 12:35 UTC35m
2026-05-31 UAL183 GUM → MNL May 31, 09:29 UTCMay 31, 12:34 UTC3h 5m
2026-05-31 UAL151 GUM → KIX May 31, 00:45 UTCMay 31, 00:55 UTC10m
2026-05-30 UAL166 FUK → GUM May 30, 03:15 UTCMay 30, 03:30 UTC15m
2026-05-30 UAL166 FUK → GUM May 30, 03:17 UTCMay 30, 06:45 UTC3h 28m
2026-05-30 UAL165 GUM → FUK May 30, 00:55 UTCMay 30, 01:20 UTC25m
2026-05-29 UAL827 NRT → GUM May 29, 02:20 UTCMay 29, 02:55 UTC35m
2026-05-29 UAL827 NRT → GUM May 29, 02:17 UTCMay 29, 05:27 UTC3h 10m
2026-05-28 UAL873 GUM → NRT May 28, 07:13 UTCMay 28, 10:22 UTC3h 9m
2026-05-28 UAL873 GUM → NRT May 28, 02:20 UTCMay 28, 10:30 UTC8h 10m
2026-05-28 UAL151 GUM → KIX May 28, 00:35 UTCMay 28, 00:50 UTC15m
2026-05-27 UAL158 PDX → ORD May 27, 17:10 UTCMay 27, 17:30 UTC20m
2026-05-27 UAL158 PDX → ORD May 27, 17:13 UTCMay 27, 18:55 UTC1h 42m
2026-05-27 UAL157 GUM → ROR May 27, 15:10 UTCMay 27, 15:35 UTC25m
2026-05-27 UAL166 FUK → GUM May 27, 03:24 UTCMay 27, 03:50 UTC25m
2026-05-27 UAL166 FUK → GUM May 27, 03:17 UTCMay 27, 06:55 UTC3h 38m
2026-05-26 UAL165 GUM → FUK May 26, 18:30 UTCMay 27, 01:39 UTC7h 10m
2026-05-26 UAL192 ROR → GUM May 26, 15:00 UTCMay 26, 17:20 UTC2h 20m
2026-05-26 UAL183 GUM → MNL May 26, 12:40 UTCMay 26, 13:19 UTC40m
2026-05-25 UAL136 NGO → GUM May 25, 03:45 UTCMay 25, 04:00 UTC15m
2026-05-20 UAL158 PDX → ORD May 20, 17:00 UTCMay 20, 17:10 UTC10m
2026-05-20 UAL157 GUM → ROR May 20, 15:05 UTCMay 20, 15:25 UTC20m
2026-05-20 UAL166 FUK → GUM May 20, 03:17 UTCMay 20, 06:34 UTC3h 17m
2026-05-20 UAL166 FUK → GUM May 20, 03:05 UTCMay 20, 03:20 UTC15m
2026-05-20 UAL165 GUM → FUK May 20, 00:45 UTCMay 20, 01:45 UTC1h 0m
2026-05-19 UAL192 ROR → GUM May 19, 18:25 UTCMay 19, 18:35 UTC10m
2026-05-19 UAL192 ROR → GUM May 19, 18:23 UTCMay 19, 20:06 UTC1h 43m
2026-05-19 UAL192 ROR → GUM May 19, 14:55 UTCMay 19, 17:10 UTC2h 15m
2026-05-19 UAL183 GUM → MNL May 19, 12:45 UTCMay 19, 13:20 UTC35m
2026-05-19 UAL183 GUM → MNL May 19, 09:59 UTCMay 19, 13:19 UTC3h 20m
2026-05-18 UAL827 NRT → GUM May 18, 02:05 UTCMay 18, 02:50 UTC45m
2026-05-17 UAL873 GUM → NRT May 17, 07:08 UTCMay 17, 10:23 UTC3h 15m
2026-05-17 UAL827 NRT → GUM May 17, 02:25 UTCMay 17, 03:05 UTC40m
2026-05-17 UAL827 NRT → GUM May 17, 02:17 UTCMay 17, 05:38 UTC3h 21m
2026-05-16 UAL873 GUM → NRT May 16, 02:20 UTCMay 16, 10:25 UTC8h 6m
2026-05-16 UAL151 GUM → KIX May 16, 00:10 UTCMay 16, 00:30 UTC20m
2026-05-15 UAL136 NGO → GUM May 15, 02:45 UTCMay 15, 05:57 UTC3h 12m
2026-05-15 UAL137 GUM → NGO May 15, 00:25 UTCMay 15, 00:45 UTC20m
2026-05-14 UAL158 PDX → ORD May 14, 17:00 UTCMay 14, 17:10 UTC10m
2026-05-14 UAL157 GUM → ROR May 14, 15:01 UTCMay 14, 15:15 UTC15m
2026-05-14 UAL157 GUM → ROR May 14, 13:52 UTCMay 14, 15:19 UTC1h 27m
2026-05-14 UAL136 NGO → GUM May 14, 02:30 UTCMay 14, 02:40 UTC10m
2026-05-14 UAL136 NGO → GUM May 14, 02:30 UTCMay 14, 05:39 UTC3h 9m

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 N73283 page for operator, model, and routing details .

Mode-S A9D605 frequently asked

What is Mode-S code A9D605?
A9D605 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N73283.
Where is Mode-S A9D605 registered?
Mode-S code A9D605 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 A9D605 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 A9D605, octal 52353005, decimal 11,130,373.
What flights does A9D605 operate?
Mode-S A9D605 has broadcast 14 distinct callsigns, including UAL873, UAL827, UAL157, UAL183, UAL136.