Apparatus

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sensors Mode-S transponder

A126C6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17303 · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
A126C6
Octal
50223306
Decimal
10,561,222
Country
US
Tail
N17303
Type
B38M
No current signal · last broadcast Jul 26, 12:30 UTC
Flights observed
209
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 12:30 UTC

Last known position

Most recent position reported by Mode-S A126C6.

Country allocation

The ICAO 24-bit address A126C6 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
UAL183 United Airlines 16 2026-07-23
UAL197 - 13 2026-07-16
UAL837 United Airlines 12 2026-07-26
UAL184 United Airlines 12 2026-07-23
UAL838 United Airlines 11 2026-07-25
UAL196 United Airlines 11 2026-07-24
UAL192 - 11 2026-06-26
UAL133 - 11 2026-06-24
UAL6 - 10 2026-07-09
UAL33 - 9 2026-07-15
UAL142 United Airlines 9 2026-07-26
UAL849 United Airlines 8 2026-07-17
UAL848 United Airlines 8 2026-07-17
UAL143 United Airlines 7 2026-07-25
UAL32 - 6 2026-07-14
UAL193 United Airlines 6 2026-05-29
UAL132 - 6 2026-06-24
UAL155 - 5 2026-06-11
UAL827 United Airlines 4 2026-05-24
UAL7 - 4 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL837 SFO → NRT Jul 26, 09:10 UTCJul 26, 12:20 UTC3h 10m
2026-07-26 UAL837 SFO → NRT Jul 26, 09:22 UTCJul 26, 12:18 UTC2h 56m
2026-07-26 UAL142 NRT → DEN Jul 26, 01:55 UTCJul 26, 02:15 UTC20m
2026-07-26 UAL142 NRT → DEN Jul 26, 02:03 UTCJul 26, 06:04 UTC4h 1m
2026-07-25 UAL143 DEN → NRT Jul 25, 08:05 UTCJul 25, 12:15 UTC4h 10m
2026-07-25 UAL143 DEN → NRT Jul 25, 08:12 UTCJul 25, 12:08 UTC3h 56m
2026-07-25 UAL838 NRT → SFO Jul 25, 02:05 UTCJul 25, 05:15 UTC3h 10m
2026-07-24 UAL837 SFO → NRT Jul 24, 09:25 UTCJul 24, 12:45 UTC3h 20m
2026-07-24 UAL196 GUM → NRT Jul 24, 02:29 UTCJul 24, 05:39 UTC3h 10m
2026-07-23 UAL184 MNL → GUM Jul 23, 15:30 UTCJul 24, 05:30 UTC14h 0m
2026-07-23 UAL183 GUM → MNL Jul 23, 09:29 UTCJul 23, 12:48 UTC3h 19m
2026-07-23 UAL136 NGO → GUM Jul 23, 02:50 UTCJul 23, 03:15 UTC25m
2026-07-23 UAL136 NGO → GUM Jul 23, 02:45 UTCJul 23, 05:57 UTC3h 12m
2026-07-22 UAL158 - Jul 22, 17:15 UTCJul 22, 17:30 UTC15m
2026-07-22 UAL157 - Jul 22, 15:25 UTCJul 22, 15:50 UTC25m
2026-07-20 UAL865 NRT → GUM Jul 20, 07:55 UTCJul 20, 08:40 UTC45m
2026-07-20 UAL865 NRT → GUM Jul 20, 07:47 UTCJul 20, 11:02 UTC3h 15m
2026-07-20 UAL838 NRT → SFO Jul 20, 02:05 UTCJul 20, 05:20 UTC3h 15m
2026-07-19 UAL837 - Jul 19, 09:15 UTCJul 19, 12:35 UTC3h 20m
2026-07-19 UAL838 NRT → SFO Jul 19, 02:10 UTCJul 19, 05:25 UTC3h 15m
2026-07-18 UAL837 - Jul 18, 09:15 UTCJul 18, 12:25 UTC3h 10m
2026-07-18 UAL837 NRT → KHH Jul 18, 09:22 UTCJul 18, 12:21 UTC2h 59m
2026-07-18 UAL864 GUM → NRT Jul 18, 03:12 UTCJul 18, 06:32 UTC3h 20m
2026-07-17 UAL848 HND → GUM Jul 17, 14:44 UTCJul 18, 06:40 UTC15h 56m
2026-07-17 UAL849 GUM → HND Jul 17, 09:54 UTCJul 17, 13:09 UTC3h 15m
2026-07-16 UAL849 GUM → HND Jul 16, 17:10 UTCJul 17, 13:15 UTC20h 5m
2026-07-16 UAL157 - Jul 16, 15:14 UTCJul 16, 15:40 UTC25m
2026-07-16 UAL197 - Jul 16, 08:15 UTCJul 16, 08:50 UTC35m
2026-07-16 UAL838 KHH → NRT Jul 16, 02:05 UTCJul 16, 05:30 UTC3h 25m
2026-07-15 UAL837 - Jul 15, 09:15 UTCJul 15, 12:25 UTC3h 10m
2026-07-15 UAL33 - Jul 15, 06:25 UTCJul 15, 06:30 UTC5m
2026-07-15 UAL33 CEB → NRT Jul 15, 02:06 UTCJul 15, 06:08 UTC4h 2m
2026-07-15 UAL33 CEB → NRT Jul 15, 02:06 UTCJul 15, 06:19 UTC4h 13m
2026-07-14 UAL32 - Jul 14, 09:30 UTCJul 14, 10:10 UTC40m
2026-07-14 UAL864 GUM → NRT Jul 14, 03:12 UTCJul 14, 06:34 UTC3h 22m
2026-07-10 UAL197 - Jul 10, 08:40 UTCJul 10, 09:15 UTC35m
2026-07-09 UAL6 - Jul 9, 11:35 UTCJul 10, 07:10 UTC19h 35m
2026-07-09 UAL6 - Jul 9, 09:35 UTCJul 10, 07:10 UTC21h 35m
2026-07-09 UAL6 - Jul 9, 08:25 UTCJul 10, 07:10 UTC22h 45m
2026-07-09 UAL142 - Jul 9, 05:30 UTCJul 9, 06:30 UTC1h 0m
2026-07-09 UAL142 - Jul 9, 02:00 UTCJul 9, 02:10 UTC10m
2026-07-08 UAL143 DEN → NRT Jul 8, 10:25 UTCJul 8, 14:45 UTC4h 20m
2026-07-08 UAL838 KHH → NRT Jul 8, 02:20 UTCJul 8, 05:30 UTC3h 10m
2026-07-07 UAL837 SFO → NRT Jul 7, 11:40 UTCJul 7, 14:50 UTC3h 10m
2026-07-07 UAL837 SFO → NRT Jul 7, 11:52 UTCJul 7, 14:51 UTC2h 59m
2026-07-07 UAL838 - Jul 7, 02:10 UTCJul 7, 03:20 UTC1h 10m
2026-07-07 UAL838 KHH → NRT Jul 7, 02:08 UTCJul 7, 05:42 UTC3h 34m
2026-07-06 UAL837 SFO → NRT Jul 6, 09:10 UTCJul 6, 12:30 UTC3h 20m
2026-07-06 UAL33 - Jul 6, 04:55 UTCJul 6, 05:40 UTC45m
2026-07-05 UAL33 - Jul 5, 09:35 UTCJul 6, 05:40 UTC20h 5m

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 N17303 page for operator, model, and routing details .

Mode-S A126C6 frequently asked

What is Mode-S code A126C6?
A126C6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17303.
Where is Mode-S A126C6 registered?
Mode-S code A126C6 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 A126C6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 12:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A126C6, octal 50223306, decimal 10,561,222.
What flights does A126C6 operate?
Mode-S A126C6 has broadcast 20 distinct callsigns, including UAL183, UAL197, UAL837, UAL184, UAL838.