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 13h ago
Flights observed
271
Distinct callsigns
20
Country
US
Last broadcast
13h ago

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 - 7 2026-06-29
UAL155 - 6 2026-07-13
UAL849 - 5 2026-07-12
UAL838 - 5 2026-07-10
UAL837 - 5 2026-07-09
UAL7 - 5 2026-06-28
UAL196 - 5 2026-07-08
UAL1903 United Airlines 5 2026-05-15
UAL1751 United Airlines 5 2026-05-15
UAL154 - 5 2026-07-13
UAL848 - 4 2026-07-12
UAL1578 United Airlines 4 2026-04-13
UAL151 - 4 2026-07-11
UAL150 - 4 2026-07-11
UAL481 United Airlines 3 2026-05-19
UAL366 United Airlines 3 2026-05-14
UAL339 United Airlines 3 2026-04-17
UAL33 - 3 2026-07-08
UAL32 - 3 2026-07-08
UAL2426 United Airlines 3 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-08 UAL32 - Jul 8, 10:50 UTCJul 9, 06:20 UTC19h 30m
2026-07-08 UAL196 - Jul 8, 08:10 UTCJul 8, 08:55 UTC45m
2026-07-07 3017 - Jul 7, 08:05 UTCJul 7, 08:25 UTC20m
2026-07-04 UAL3047 GUM → ROR Jul 4, 20:14 UTCJul 4, 21:49 UTC1h 35m
2026-07-03 UAL3039 - Jul 3, 17:20 UTCJul 3, 17:40 UTC20m
2026-07-03 UAL3039 HNL → MAJ Jul 3, 17:18 UTCJul 3, 22:00 UTC4h 42m
2026-07-03 UAL155 - Jul 3, 04:00 UTCJul 3, 04:15 UTC15m
2026-07-03 UAL155 MAJ → HNL Jul 3, 00:03 UTCJul 3, 04:15 UTC4h 12m
2026-07-01 UAL827 - Jul 1, 02:25 UTCJul 1, 03:00 UTC35m
2026-07-01 UAL827 NRT → GUM Jul 1, 02:17 UTCJul 1, 05:34 UTC3h 17m
2026-06-30 UAL873 - Jun 30, 09:50 UTCJun 30, 10:35 UTC45m
2026-06-30 UAL150 KIX → GUM Jun 30, 02:25 UTCJun 30, 05:20 UTC2h 55m
2026-06-30 UAL150 KIX → GUM Jun 30, 02:10 UTCJun 30, 02:25 UTC15m
2026-06-30 UAL151 GUM → KIX Jun 30, 00:25 UTCJun 30, 00:35 UTC10m
2026-06-29 UAL151 GUM → KIX Jun 29, 21:28 UTCJun 30, 00:33 UTC3h 5m
2026-06-29 UAL197 - Jun 29, 08:29 UTCJun 29, 09:05 UTC35m
2026-06-29 UAL6 - Jun 29, 04:04 UTCJun 29, 06:50 UTC2h 45m
2026-06-28 UAL6 - Jun 28, 11:19 UTCJun 29, 06:50 UTC19h 30m
2026-06-28 UAL6 - Jun 28, 09:05 UTCJun 29, 06:50 UTC21h 45m
2026-06-28 UAL7 - Jun 28, 08:25 UTCJun 28, 10:30 UTC2h 5m
2026-06-28 UAL7 NRT → UBN Jun 28, 08:12 UTCJun 28, 13:07 UTC4h 55m
2026-06-28 UAL142 NRT → DEN Jun 28, 02:05 UTCJun 28, 06:24 UTC4h 20m
2026-06-27 UAL143 DEN → NRT Jun 27, 08:05 UTCJun 27, 12:15 UTC4h 10m
2026-06-27 UAL196 GUM → NRT Jun 27, 02:29 UTCJun 27, 05:51 UTC3h 22m
2026-06-25 UAL154 - Jun 25, 17:44 UTCJun 25, 18:04 UTC20m
2026-06-25 UAL155 - Jun 25, 12:35 UTCJun 25, 12:54 UTC20m
2026-06-24 UAL197 - Jun 24, 08:14 UTCJun 24, 08:49 UTC35m
2026-06-24 UAL6 UBN → NRT Jun 24, 02:12 UTCJun 24, 06:15 UTC4h 3m
2026-06-23 UAL7 - Jun 23, 07:55 UTCJun 23, 11:24 UTC3h 30m
2026-06-23 UAL838 KHH → NRT Jun 23, 02:08 UTCJun 23, 05:16 UTC3h 8m
2026-06-23 UAL838 KHH → NRT Jun 23, 02:09 UTCJun 23, 05:20 UTC3h 10m
2026-06-22 UAL837 SFO → NRT Jun 22, 09:10 UTCJun 22, 12:34 UTC3h 25m
2026-06-22 UAL837 SFO → NRT Jun 22, 09:22 UTCJun 22, 12:35 UTC3h 13m

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 13h ago.
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, UAL155, UAL849, UAL838, UAL837.