Apparatus

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sensors Mode-S transponder

A126CC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17309 · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
A126CC
Octal
50223314
Decimal
10,561,228
Country
US
Tail
N17309
Type
B38M
No current signal · last broadcast Jul 26, 02:35 UTC
Flights observed
304
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 02:35 UTC

Last known position

Most recent position reported by Mode-S A126CC.

Country allocation

The ICAO 24-bit address A126CC 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 9 2026-07-24
UAL838 United Airlines 8 2026-07-23
UAL837 - 8 2026-07-22
UAL196 - 8 2026-07-22
UAL7 United Airlines 7 2026-07-23
UAL155 United Airlines 7 2026-07-20
UAL154 - 6 2026-07-20
UAL150 United Airlines 6 2026-07-26
UAL849 - 5 2026-07-12
UAL33 - 5 2026-07-16
UAL1903 United Airlines 5 2026-05-15
UAL1751 United Airlines 5 2026-05-15
UAL151 United Airlines 5 2026-07-25
UAL848 - 4 2026-07-12
UAL827 United Airlines 4 2026-07-25
UAL197 United Airlines 4 2026-07-24
UAL1578 United Airlines 4 2026-04-13
UAL865 United Airlines 3 2026-07-17
UAL481 United Airlines 3 2026-05-19
UAL366 United Airlines 3 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL150 KIX → GUM Jul 26, 02:25 UTCJul 26, 05:41 UTC3h 16m
2026-07-26 UAL150 KIX → GUM Jul 26, 02:25 UTCJul 26, 02:35 UTC10m
2026-07-25 UAL151 GUM → KIX Jul 25, 21:28 UTCJul 26, 00:44 UTC3h 16m
2026-07-25 UAL874 NRT → GUM Jul 25, 12:15 UTCJul 25, 12:50 UTC35m
2026-07-25 UAL873 GUM → NRT Jul 25, 09:40 UTCJul 25, 10:25 UTC45m
2026-07-25 UAL827 NRT → GUM Jul 25, 02:25 UTCJul 25, 03:05 UTC40m
2026-07-25 UAL827 NRT → GUM Jul 25, 02:17 UTCJul 25, 05:42 UTC3h 25m
2026-07-25 UAL828 GUM → NRT Jul 25, 00:00 UTCJul 25, 00:40 UTC40m
2026-07-24 UAL197 NRT → GUM Jul 24, 08:25 UTCJul 24, 09:00 UTC35m
2026-07-24 UAL197 NRT → GUM Jul 24, 08:27 UTCJul 24, 11:33 UTC3h 6m
2026-07-24 UAL6 NRT → IAH Jul 24, 03:35 UTCJul 24, 06:40 UTC3h 5m
2026-07-24 UAL6 NRT → IAH Jul 24, 02:12 UTCJul 24, 06:31 UTC4h 19m
2026-07-23 UAL7 IAH → NRT Jul 23, 07:55 UTCJul 23, 09:00 UTC1h 5m
2026-07-23 UAL7 IAH → NRT Jul 23, 07:47 UTCJul 23, 12:12 UTC4h 25m
2026-07-23 UAL838 NRT → SFO Jul 23, 02:10 UTCJul 23, 05:35 UTC3h 25m
2026-07-22 UAL837 NRT → KHH Jul 22, 09:52 UTCJul 22, 12:55 UTC3h 3m
2026-07-22 UAL196 - Jul 22, 05:05 UTCJul 22, 05:25 UTC20m
2026-07-20 UAL154 - Jul 20, 18:30 UTCJul 20, 18:40 UTC10m
2026-07-20 UAL155 MAJ → HNL Jul 20, 13:50 UTCJul 20, 14:15 UTC25m
2026-07-18 UAL184 - Jul 18, 15:55 UTCJul 18, 16:25 UTC30m
2026-07-18 UAL183 - Jul 18, 13:25 UTCJul 18, 14:15 UTC50m
2026-07-18 UAL166 - Jul 18, 03:30 UTCJul 18, 03:50 UTC20m
2026-07-18 UAL166 TPE → GUM Jul 18, 03:17 UTCJul 18, 07:07 UTC3h 50m
2026-07-18 UAL165 - Jul 18, 01:05 UTCJul 18, 01:20 UTC15m
2026-07-17 UAL865 NRT → GUM Jul 17, 07:50 UTCJul 17, 08:30 UTC40m
2026-07-17 UAL838 KHH → NRT Jul 17, 02:08 UTCJul 17, 05:22 UTC3h 14m
2026-07-17 UAL838 KHH → NRT Jul 17, 02:05 UTCJul 17, 05:25 UTC3h 20m
2026-07-16 UAL837 - Jul 16, 09:15 UTCJul 16, 12:25 UTC3h 10m
2026-07-16 UAL837 NRT → KHH Jul 16, 09:22 UTCJul 16, 12:19 UTC2h 57m
2026-07-16 UAL33 CEB → NRT Jul 16, 01:36 UTCJul 16, 05:50 UTC4h 14m
2026-07-15 UAL33 - Jul 15, 09:15 UTCJul 16, 06:00 UTC20h 45m
2026-07-15 UAL196 - Jul 15, 05:20 UTCJul 15, 06:20 UTC1h 0m
2026-07-15 UAL196 GUM → NRT Jul 15, 02:29 UTCJul 15, 06:08 UTC3h 39m
2026-07-13 UAL154 - Jul 13, 17:40 UTCJul 13, 17:55 UTC15m
2026-07-13 UAL154 HNL → MAJ Jul 13, 17:28 UTCJul 13, 22:14 UTC4h 46m
2026-07-13 UAL155 - Jul 13, 12:05 UTCJul 13, 12:25 UTC20m
2026-07-12 UAL848 - Jul 12, 15:05 UTCJul 13, 12:25 UTC21h 20m
2026-07-12 UAL848 HND → GUM Jul 12, 15:00 UTCJul 12, 18:08 UTC3h 8m
2026-07-12 UAL849 - Jul 12, 12:05 UTCJul 12, 12:50 UTC45m
2026-07-11 UAL849 - Jul 11, 15:05 UTCJul 12, 12:50 UTC21h 45m
2026-07-11 UAL849 - Jul 11, 12:30 UTCJul 11, 13:10 UTC40m
2026-07-11 UAL849 GUM → HND Jul 11, 09:44 UTCJul 11, 13:10 UTC3h 26m
2026-07-11 UAL150 - Jul 11, 02:15 UTCJul 11, 02:30 UTC15m
2026-07-11 UAL151 - Jul 11, 00:15 UTCJul 11, 00:25 UTC10m
2026-07-10 UAL865 - Jul 10, 08:10 UTCJul 10, 08:45 UTC35m
2026-07-10 UAL838 - Jul 10, 02:10 UTCJul 10, 02:55 UTC45m
2026-07-10 UAL838 KHH → NRT Jul 10, 02:08 UTCJul 10, 05:21 UTC3h 13m
2026-07-09 UAL837 SFO → NRT Jul 9, 09:22 UTCJul 9, 12:15 UTC2h 53m
2026-07-09 UAL837 - Jul 9, 09:05 UTCJul 9, 12:20 UTC3h 15m
2026-07-08 UAL33 - Jul 8, 11:05 UTCJul 9, 06:20 UTC19h 15m

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 N17309 page for operator, model, and routing details .

Mode-S A126CC frequently asked

What is Mode-S code A126CC?
A126CC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17309.
Where is Mode-S A126CC registered?
Mode-S code A126CC 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 A126CC broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 02:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A126CC, octal 50223314, decimal 10,561,228.
What flights does A126CC operate?
Mode-S A126CC has broadcast 20 distinct callsigns, including UAL6, UAL838, UAL837, UAL196, UAL7.