Apparatus

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sensors Mode-S transponder

A126C9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17306 · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
A126C9
Octal
50223311
Decimal
10,561,225
Country
US
Tail
N17306
Type
B38M
No current signal · last broadcast 4h ago
Flights observed
123
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A126C9.

Country allocation

The ICAO 24-bit address A126C9 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
UAL6 United Airlines 24 2026-06-07
UAL7 United Airlines 17 2026-06-07
UAL196 United Airlines 12 2026-06-06
UAL197 - 10 2026-06-18
UAL193 - 7 2026-06-19
UAL143 United Airlines 7 2026-06-06
UAL142 United Airlines 6 2026-06-07
UAL133 - 5 2026-06-20
UAL184 - 4 2026-06-22
UAL132 United Airlines 4 2026-06-20
UAL183 - 3 2026-06-22
UAL849 United Airlines 2 2026-06-15
UAL848 United Airlines 2 2026-06-15
UAL827 United Airlines 2 2026-05-07
UAL3916 United Airlines 2 2026-04-30
UAL33 - 2 2026-06-17
UAL158 United Airlines 2 2026-05-25
UAL157 United Airlines 2 2026-06-21
UAL151 United Airlines 2 2026-06-22
UAL150 United Airlines 2 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-23 UAL150 KIX → GUM Jun 23, 02:20 UTCJun 23, 02:34 UTC15m
2026-06-22 UAL151 GUM → KIX Jun 22, 21:28 UTCJun 23, 00:32 UTC3h 4m
2026-06-22 UAL184 - Jun 22, 14:40 UTCJun 22, 15:05 UTC25m
2026-06-22 UAL183 - Jun 22, 12:00 UTCJun 22, 12:40 UTC40m
2026-06-21 UAL183 - Jun 21, 17:20 UTCJun 22, 12:40 UTC19h 20m
2026-06-21 UAL157 GUM → ROR Jun 21, 15:25 UTCJun 21, 15:44 UTC20m
2026-06-20 UAL132 MAJ → PNI Jun 20, 17:39 UTCJun 20, 18:04 UTC25m
2026-06-20 UAL133 MAJ → HNL Jun 20, 07:54 UTCJun 20, 12:22 UTC4h 28m
2026-06-19 UAL184 - Jun 19, 16:04 UTCJun 20, 12:14 UTC20h 10m
2026-06-19 UAL193 - Jun 19, 12:14 UTCJun 19, 14:34 UTC2h 20m
2026-06-19 UAL193 - Jun 19, 10:35 UTCJun 19, 10:54 UTC20m
2026-06-18 UAL197 - Jun 18, 08:30 UTCJun 18, 09:10 UTC40m
2026-06-18 UAL838 KHH → NRT Jun 18, 02:05 UTCJun 18, 05:15 UTC3h 10m
2026-06-17 UAL837 SFO → NRT Jun 17, 10:20 UTCJun 17, 13:50 UTC3h 30m
2026-06-17 UAL33 - Jun 17, 05:10 UTCJun 17, 06:00 UTC50m
2026-06-16 UAL33 - Jun 16, 09:20 UTCJun 17, 06:00 UTC20h 41m
2026-06-16 UAL864 GUM → NRT Jun 16, 03:12 UTCJun 16, 06:32 UTC3h 20m
2026-06-15 UAL848 HND → GUM Jun 15, 14:50 UTCJun 16, 06:45 UTC15h 55m
2026-06-15 UAL849 GUM → HND Jun 15, 12:15 UTCJun 15, 12:55 UTC40m
2026-06-14 UAL3020 - Jun 14, 18:10 UTCJun 14, 18:25 UTC15m
2026-06-14 UAL150 KIX → GUM Jun 14, 03:15 UTCJun 14, 15:10 UTC11h 55m
2026-06-14 UAL151 GUM → KIX Jun 14, 01:40 UTCJun 14, 01:50 UTC10m
2026-06-13 UAL184 MNL → GUM Jun 13, 15:00 UTCJun 13, 15:40 UTC40m
2026-06-13 UAL183 GUM → MNL Jun 13, 12:00 UTCJun 13, 12:50 UTC50m
2026-06-10 UAL132 MAJ → PNI Jun 10, 17:40 UTCJun 10, 18:00 UTC20m
2026-06-10 UAL133 MAJ → HNL Jun 10, 11:40 UTCJun 10, 12:05 UTC25m
2026-06-09 UAL848 HND → GUM Jun 9, 14:45 UTCJun 10, 12:05 UTC21h 20m
2026-06-09 UAL849 GUM → HND Jun 9, 12:10 UTCJun 9, 13:00 UTC50m
2026-06-08 UAL197 NRT → GUM Jun 8, 08:15 UTCJun 8, 08:50 UTC35m
2026-06-07 UAL6 NRT → IAH Jun 7, 10:20 UTCJun 8, 06:15 UTC19h 55m
2026-06-07 UAL7 IAH → NRT Jun 7, 08:20 UTCJun 8, 06:15 UTC21h 55m
2026-06-07 UAL7 IAH → NRT Jun 7, 08:05 UTCJun 8, 06:15 UTC22h 10m
2026-06-07 UAL142 NRT → DEN Jun 7, 02:00 UTCJun 7, 02:19 UTC20m
2026-06-07 UAL142 NRT → DEN Jun 7, 02:03 UTCJun 7, 06:08 UTC4h 5m
2026-06-06 UAL143 DEN → NRT Jun 6, 08:10 UTCJun 6, 12:24 UTC4h 15m
2026-06-06 UAL196 GUM → NRT Jun 6, 05:05 UTCJun 6, 05:40 UTC35m
2026-06-05 UAL197 NRT → GUM Jun 5, 09:10 UTCJun 5, 09:45 UTC35m
2026-06-05 UAL197 NRT → GUM Jun 5, 08:57 UTCJun 5, 12:15 UTC3h 18m
2026-06-05 UAL6 NRT → IAH Jun 5, 06:20 UTCJun 5, 06:25 UTC5m
2026-06-05 UAL6 NRT → IAH Jun 5, 02:12 UTCJun 5, 06:04 UTC3h 52m
2026-06-04 UAL7 IAH → NRT Jun 4, 08:15 UTCJun 4, 11:55 UTC3h 40m
2026-06-04 UAL7 IAH → NRT Jun 4, 08:02 UTCJun 4, 13:07 UTC5h 5m
2026-06-03 UAL6 NRT → IAH Jun 3, 05:55 UTCJun 3, 08:55 UTC3h 0m
2026-06-02 UAL6 NRT → IAH Jun 2, 10:20 UTCJun 3, 08:55 UTC22h 35m
2026-06-02 UAL7 IAH → NRT Jun 2, 08:50 UTCJun 3, 08:15 UTC23h 25m
2026-06-02 UAL196 GUM → NRT Jun 2, 05:05 UTCJun 2, 06:00 UTC55m
2026-06-01 UAL196 GUM → NRT Jun 1, 08:20 UTCJun 2, 06:00 UTC21h 40m
2026-06-01 UAL6 NRT → IAH Jun 1, 04:10 UTCJun 1, 06:00 UTC1h 50m
2026-05-31 UAL7 IAH → NRT May 31, 07:47 UTCMay 31, 12:45 UTC4h 58m
2026-05-31 UAL6 NRT → IAH May 31, 08:25 UTCJun 1, 06:00 UTC21h 35m

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 N17306 page for operator, model, and routing details .

Mode-S A126C9 frequently asked

What is Mode-S code A126C9?
A126C9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17306.
Where is Mode-S A126C9 registered?
Mode-S code A126C9 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 A126C9 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 A126C9, octal 50223311, decimal 10,561,225.
What flights does A126C9 operate?
Mode-S A126C9 has broadcast 20 distinct callsigns, including UAL6, UAL7, UAL196, UAL197, UAL193.