Apparatus

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sensors Mode-S transponder

A126EC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17316 · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
A126EC
Octal
50223354
Decimal
10,561,260
Country
US
Tail
N17316
Type
B38M
No current signal · last broadcast 3h ago
Flights observed
96
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A126EC.

Country allocation

The ICAO 24-bit address A126EC 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
UAL793 United Airlines 5 2026-04-17
UAL1517 United Airlines 5 2026-04-18
UAL848 United Airlines 4 2026-05-20
UAL837 United Airlines 4 2026-05-26
UAL307 United Airlines 4 2026-04-17
UAL183 United Airlines 4 2026-05-24
UAL849 United Airlines 3 2026-05-20
UAL838 United Airlines 3 2026-05-27
UAL511 United Airlines 3 2026-04-17
UAL197 United Airlines 3 2026-05-27
UAL1673 - 3 2026-04-13
UAL155 United Airlines 3 2026-05-28
UAL1352 United Airlines 3 2026-04-15
UAL827 United Airlines 2 2026-05-20
UAL7 United Airlines 2 2026-05-14
UAL6 United Airlines 2 2026-05-15
UAL595 United Airlines 2 2026-04-16
UAL513 United Airlines 2 2026-04-14
UAL482 United Airlines 2 2026-04-16
UAL3877 United Airlines 2 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 UAL150 KIX → GUM May 30, 02:20 UTCMay 30, 02:35 UTC15m
2026-05-30 UAL151 GUM → KIX May 30, 00:40 UTCMay 30, 00:55 UTC15m
2026-05-28 UAL154 TKK → GUM May 28, 17:35 UTCMay 28, 17:50 UTC15m
2026-05-28 UAL155 MAJ → HNL May 28, 12:05 UTCMay 28, 12:30 UTC25m
2026-05-28 UAL155 MAJ → HNL May 28, 08:22 UTCMay 28, 12:34 UTC4h 12m
2026-05-27 UAL197 NRT → GUM May 27, 08:10 UTCMay 27, 08:45 UTC35m
2026-05-27 UAL838 NRT → SFO May 27, 02:09 UTCMay 27, 05:35 UTC3h 25m
2026-05-26 UAL837 SFO → NRT May 26, 09:15 UTCMay 26, 12:35 UTC3h 20m
2026-05-26 UAL837 SFO → NRT May 26, 09:22 UTCMay 26, 12:34 UTC3h 12m
2026-05-26 UAL838 NRT → SFO May 26, 02:04 UTCMay 26, 05:45 UTC3h 40m
2026-05-25 UAL837 SFO → NRT May 25, 09:20 UTCMay 25, 12:35 UTC3h 15m
2026-05-24 UAL196 GUM → NRT May 24, 14:50 UTCMay 25, 05:50 UTC15h 0m
2026-05-24 UAL183 GUM → MNL May 24, 09:29 UTCMay 24, 12:56 UTC3h 27m
2026-05-23 UAL132 MAJ → PNI May 23, 17:35 UTCMay 23, 17:55 UTC20m
2026-05-23 UAL133 MAJ → HNL May 23, 12:15 UTCMay 23, 12:35 UTC20m
2026-05-21 UAL154 TKK → GUM May 21, 17:30 UTCMay 21, 17:45 UTC15m
2026-05-21 UAL155 MAJ → HNL May 21, 12:50 UTCMay 21, 13:20 UTC30m
2026-05-20 UAL848 HND → GUM May 20, 14:45 UTCMay 21, 13:01 UTC22h 15m
2026-05-20 UAL849 GUM → HND May 20, 09:44 UTCMay 20, 12:58 UTC3h 14m
2026-05-20 UAL827 NRT → GUM May 20, 02:10 UTCMay 20, 02:45 UTC35m
2026-05-20 UAL827 NRT → GUM May 20, 02:17 UTCMay 20, 05:21 UTC3h 4m
2026-05-18 UAL873 GUM → NRT May 18, 15:05 UTCMay 19, 10:25 UTC19h 19m
2026-05-18 UAL848 HND → GUM May 18, 14:55 UTCMay 19, 10:25 UTC19h 29m
2026-05-18 UAL849 GUM → HND May 18, 12:10 UTCMay 18, 13:05 UTC55m
2026-05-15 UAL197 NRT → GUM May 15, 08:20 UTCMay 15, 08:55 UTC35m
2026-05-15 UAL197 NRT → GUM May 15, 08:32 UTCMay 15, 11:52 UTC3h 20m
2026-05-15 UAL6 NRT → IAH May 15, 04:40 UTCMay 15, 06:55 UTC2h 15m
2026-05-14 UAL6 NRT → IAH May 14, 09:20 UTCMay 15, 06:55 UTC21h 35m
2026-05-14 UAL7 IAH → NRT May 14, 08:00 UTCMay 14, 09:50 UTC1h 50m
2026-05-14 UAL7 IAH → NRT May 14, 07:47 UTCMay 14, 12:32 UTC4h 45m
2026-05-14 UAL838 NRT → SFO May 14, 02:10 UTCMay 14, 05:05 UTC2h 55m
2026-05-13 UAL837 SFO → NRT May 13, 09:00 UTCMay 13, 12:40 UTC3h 40m
2026-05-13 UAL196 GUM → NRT May 13, 02:24 UTCMay 13, 06:12 UTC3h 48m
2026-05-12 UAL192 ROR → GUM May 12, 18:15 UTCMay 12, 18:20 UTC5m
2026-05-12 UAL192 ROR → GUM May 12, 14:45 UTCMay 12, 17:10 UTC2h 25m
2026-05-12 UAL183 GUM → MNL May 12, 12:10 UTCMay 12, 12:55 UTC45m
2026-05-12 UAL183 GUM → MNL May 12, 09:29 UTCMay 12, 12:56 UTC3h 27m
2026-05-11 UAL184 MNL → GUM May 11, 14:45 UTCMay 11, 15:15 UTC30m
2026-05-11 UAL184 MNL → GUM May 11, 14:50 UTCMay 11, 17:49 UTC2h 59m
2026-05-11 UAL183 GUM → MNL May 11, 02:35 UTCMay 11, 13:00 UTC10h 25m
2026-05-10 UAL137 GUM → NGO May 10, 21:33 UTCMay 11, 00:58 UTC3h 25m
2026-05-10 UAL848 HND → GUM May 10, 15:00 UTCMay 10, 18:03 UTC3h 3m
2026-05-10 UAL848 HND → GUM May 10, 14:54 UTCMay 10, 15:29 UTC35m
2026-05-10 UAL849 GUM → HND May 10, 12:30 UTCMay 10, 13:19 UTC50m
2026-05-08 UAL3879 IAH → ROW May 8, 23:40 UTCMay 9, 00:00 UTC20m
2026-05-08 UAL3877 BFM → DEN May 8, 02:35 UTCMay 8, 07:55 UTC5h 20m
2026-05-08 UAL3877 BFM → DEN May 8, 02:48 UTCMay 8, 07:48 UTC5h 0m
2026-05-07 UAL3876 MCO → ORD May 7, 21:20 UTCMay 8, 01:04 UTC3h 44m
2026-05-07 UAL3876 MCO → ORD May 7, 21:25 UTCMay 8, 00:59 UTC3h 34m
2026-04-19 UAL3885 SFO → VCV Apr 19, 01:40 UTCApr 19, 01:55 UTC15m

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 N17316 page for operator, model, and routing details .

Mode-S A126EC frequently asked

What is Mode-S code A126EC?
A126EC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17316.
Where is Mode-S A126EC registered?
Mode-S code A126EC 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 A126EC broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A126EC, octal 50223354, decimal 10,561,260.
What flights does A126EC operate?
Mode-S A126EC has broadcast 20 distinct callsigns, including UAL793, UAL1517, UAL848, UAL837, UAL307.