Apparatus

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sensors Mode-S transponder

A126C5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17302 · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
A126C5
Octal
50223305
Decimal
10,561,221
Country
US
Tail
N17302
Type
B38M
No current signal · last broadcast 15h ago
Flights observed
220
Distinct callsigns
17
Country
US
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S A126C5.

Country allocation

The ICAO 24-bit address A126C5 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 17 distinct

Callsign Airline Flights Last seen
UAL183 - 40 2026-07-17
UAL184 - 31 2026-07-13
UAL193 - 24 2026-07-03
UAL192 United Airlines 23 2026-07-17
UAL873 - 22 2026-07-15
UAL827 - 17 2026-07-17
UAL151 - 16 2026-07-04
UAL136 - 11 2026-07-10
UAL150 United Airlines 8 2026-06-26
UAL158 - 7 2026-07-12
UAL157 - 6 2026-07-12
UAL166 - 4 2026-06-24
UAL137 - 4 2026-07-09
UAL165 - 3 2026-06-24
UAL197 United Airlines 2 2026-05-13
UAL3909 United Airlines 1 2026-04-15
UAL3877 - 1 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 UAL192 ROR → GUM Jul 17, 18:34 UTCJul 17, 19:00 UTC25m
2026-07-17 UAL192 ROR → GUM Jul 17, 15:00 UTCJul 17, 17:20 UTC2h 20m
2026-07-17 UAL183 - Jul 17, 12:35 UTCJul 17, 13:15 UTC40m
2026-07-17 UAL183 GUM → MNL Jul 17, 09:49 UTCJul 17, 13:24 UTC3h 35m
2026-07-17 UAL827 - Jul 17, 02:25 UTCJul 17, 02:59 UTC35m
2026-07-17 UAL827 NRT → GUM Jul 17, 02:17 UTCJul 17, 05:34 UTC3h 17m
2026-07-15 UAL873 - Jul 15, 15:20 UTCJul 16, 10:35 UTC19h 15m
2026-07-15 UAL873 - Jul 15, 14:50 UTCJul 16, 10:35 UTC19h 45m
2026-07-15 UAL183 GUM → MNL Jul 15, 09:29 UTCJul 15, 12:43 UTC3h 14m
2026-07-13 UAL184 - Jul 13, 15:15 UTCJul 13, 15:45 UTC30m
2026-07-13 UAL183 GUM → MNL Jul 13, 09:29 UTCJul 13, 12:39 UTC3h 10m
2026-07-12 UAL158 - Jul 12, 17:40 UTCJul 12, 18:01 UTC20m
2026-07-12 UAL158 ROR → GUM Jul 12, 17:38 UTCJul 12, 19:27 UTC1h 49m
2026-07-12 UAL157 - Jul 12, 16:01 UTCJul 12, 16:35 UTC35m
2026-07-12 UAL157 GUM → ROR Jul 12, 14:11 UTCJul 12, 16:22 UTC2h 11m
2026-07-10 UAL136 - Jul 10, 02:35 UTCJul 10, 02:50 UTC15m
2026-07-10 UAL136 NGO → GUM Jul 10, 02:45 UTCJul 10, 05:47 UTC3h 2m
2026-07-09 UAL184 - Jul 9, 14:45 UTCJul 9, 15:15 UTC30m
2026-07-09 UAL183 - Jul 9, 12:15 UTCJul 9, 13:05 UTC50m
2026-07-09 UAL183 GUM → MNL Jul 9, 09:29 UTCJul 9, 13:02 UTC3h 33m
2026-07-09 UAL136 - Jul 9, 02:30 UTCJul 9, 02:40 UTC10m
2026-07-09 UAL137 - Jul 9, 00:50 UTCJul 9, 01:05 UTC15m
2026-07-08 UAL3877 - Jul 8, 13:55 UTCJul 8, 14:35 UTC40m
2026-07-04 UAL183 - Jul 4, 02:20 UTCJul 4, 13:25 UTC11h 5m
2026-07-04 UAL151 - Jul 4, 00:50 UTCJul 4, 01:00 UTC10m
2026-07-03 UAL151 GUM → KIX Jul 3, 21:33 UTCJul 4, 00:51 UTC3h 18m
2026-07-03 UAL184 - Jul 3, 16:15 UTCJul 3, 16:45 UTC30m
2026-07-03 UAL184 MNL → GUM Jul 3, 16:15 UTCJul 3, 19:22 UTC3h 7m
2026-07-03 UAL193 ROR → MNL Jul 3, 12:30 UTCJul 3, 14:50 UTC2h 20m
2026-07-03 UAL193 ROR → MNL Jul 3, 12:23 UTCJul 3, 14:50 UTC2h 27m
2026-07-03 UAL193 - Jul 3, 10:40 UTCJul 3, 11:00 UTC20m
2026-07-03 UAL827 - Jul 3, 02:20 UTCJul 3, 02:55 UTC35m
2026-07-01 UAL873 - Jul 1, 15:20 UTCJul 2, 10:20 UTC19h 0m
2026-07-01 UAL873 - Jul 1, 14:55 UTCJul 2, 10:20 UTC19h 25m
2026-07-01 UAL183 - Jul 1, 11:45 UTCJul 1, 12:30 UTC45m
2026-06-30 UAL192 - Jun 30, 18:15 UTCJun 30, 18:30 UTC15m
2026-06-30 UAL192 ROR → GUM Jun 30, 18:18 UTCJun 30, 20:06 UTC1h 48m
2026-06-30 UAL192 - Jun 30, 14:40 UTCJun 30, 17:00 UTC2h 20m
2026-06-30 UAL183 - Jun 30, 12:00 UTCJun 30, 12:50 UTC50m
2026-06-30 UAL183 GUM → MNL Jun 30, 09:29 UTCJun 30, 12:48 UTC3h 19m
2026-06-29 UAL158 - Jun 29, 17:05 UTCJun 29, 17:14 UTC10m
2026-06-29 UAL827 - Jun 29, 02:00 UTCJun 29, 15:45 UTC13h 45m
2026-06-28 UAL873 - Jun 28, 09:50 UTCJun 28, 10:35 UTC45m
2026-06-28 UAL827 - Jun 28, 02:14 UTCJun 28, 02:54 UTC40m
2026-06-28 UAL827 NRT → GUM Jun 28, 02:17 UTCJun 28, 05:28 UTC3h 11m
2026-06-27 UAL873 - Jun 27, 02:25 UTCJun 27, 10:29 UTC8h 5m
2026-06-27 UAL151 GUM → KIX Jun 27, 00:25 UTCJun 27, 00:34 UTC10m
2026-06-26 UAL150 KIX → GUM Jun 26, 02:25 UTCJun 26, 05:35 UTC3h 10m
2026-06-26 UAL150 KIX → GUM Jun 26, 02:14 UTCJun 26, 02:34 UTC20m
2026-06-25 UAL151 GUM → KIX Jun 25, 21:28 UTCJun 26, 00:32 UTC3h 4m

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 N17302 page for operator, model, and routing details .

Mode-S A126C5 frequently asked

What is Mode-S code A126C5?
A126C5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17302.
Where is Mode-S A126C5 registered?
Mode-S code A126C5 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 A126C5 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A126C5, octal 50223305, decimal 10,561,221.
What flights does A126C5 operate?
Mode-S A126C5 has broadcast 17 distinct callsigns, including UAL183, UAL184, UAL193, UAL192, UAL873.