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 2h ago
Flights observed
171
Distinct callsigns
20
Country
US
Last broadcast
2h 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
UAL849 - 12 2026-06-18
UAL848 - 11 2026-06-18
UAL183 - 9 2026-07-11
UAL155 - 7 2026-07-09
UAL837 United Airlines 6 2026-06-11
UAL827 - 6 2026-06-23
UAL184 - 6 2026-07-11
UAL873 - 5 2026-06-22
UAL838 United Airlines 5 2026-06-12
UAL793 United Airlines 5 2026-04-17
UAL197 - 5 2026-07-14
UAL196 - 5 2026-07-13
UAL154 - 5 2026-07-09
UAL1517 United Airlines 5 2026-04-18
UAL151 - 5 2026-07-04
UAL33 - 4 2026-07-14
UAL307 United Airlines 4 2026-04-17
UAL150 - 4 2026-07-07
UAL511 United Airlines 3 2026-04-17
UAL1673 - 3 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL197 - Jul 14, 08:10 UTCJul 14, 08:45 UTC35m
2026-07-14 UAL33 - Jul 14, 05:10 UTCJul 14, 06:05 UTC55m
2026-07-13 UAL33 - Jul 13, 09:25 UTCJul 14, 06:05 UTC20h 40m
2026-07-13 UAL196 - Jul 13, 05:10 UTCJul 13, 06:20 UTC1h 10m
2026-07-11 UAL184 - Jul 11, 14:55 UTCJul 11, 15:20 UTC25m
2026-07-11 UAL183 - Jul 11, 12:00 UTCJul 11, 12:45 UTC45m
2026-07-09 UAL154 - Jul 9, 18:00 UTCJul 9, 18:10 UTC10m
2026-07-09 UAL155 - Jul 9, 13:20 UTCJul 9, 13:40 UTC20m
2026-07-08 UAL3884 - Jul 8, 15:20 UTCJul 8, 17:55 UTC2h 35m
2026-07-07 UAL183 - Jul 7, 16:30 UTCJul 7, 16:55 UTC25m
2026-07-07 UAL183 - Jul 7, 11:00 UTCJul 7, 13:30 UTC2h 30m
2026-07-07 UAL150 - Jul 7, 03:45 UTCJul 7, 04:00 UTC15m
2026-07-04 UAL151 GUM → KIX Jul 4, 21:28 UTCJul 5, 01:34 UTC4h 6m
2026-06-28 UAL150 KIX → GUM Jun 28, 02:10 UTCJun 28, 02:29 UTC20m
2026-06-28 UAL151 GUM → KIX Jun 28, 00:15 UTCJun 28, 00:30 UTC15m
2026-06-26 UAL184 - Jun 26, 16:54 UTCJun 26, 17:00 UTC5m
2026-06-26 UAL184 MNL → GUM Jun 26, 16:55 UTCJun 26, 20:10 UTC3h 15m
2026-06-26 UAL193 - Jun 26, 14:55 UTCJun 26, 15:39 UTC45m
2026-06-26 UAL193 - Jun 26, 11:14 UTCJun 26, 11:40 UTC25m
2026-06-25 UAL158 - Jun 25, 17:39 UTCJun 25, 18:04 UTC25m
2026-06-25 UAL158 ROR → GUM Jun 25, 17:13 UTCJun 25, 19:21 UTC2h 8m
2026-06-25 UAL136 - Jun 25, 03:04 UTCJun 25, 15:50 UTC12h 45m
2026-06-24 UAL137 GUM → NGO Jun 24, 21:43 UTCJun 25, 00:59 UTC3h 16m
2026-06-24 UAL184 - Jun 24, 14:50 UTCJun 24, 15:24 UTC35m
2026-06-24 UAL183 - Jun 24, 11:54 UTCJun 24, 12:40 UTC45m
2026-06-24 UAL183 GUM → MNL Jun 24, 09:29 UTCJun 24, 12:30 UTC3h 1m
2026-06-23 UAL827 - Jun 23, 02:15 UTCJun 23, 02:49 UTC35m
2026-06-22 UAL873 - Jun 22, 09:54 UTCJun 22, 10:44 UTC50m
2026-06-22 UAL827 - Jun 22, 02:10 UTCJun 22, 02:45 UTC35m
2026-06-22 UAL827 NRT → GUM Jun 22, 02:17 UTCJun 22, 05:18 UTC3h 1m
2026-06-21 UAL873 GUM → NRT Jun 21, 07:13 UTCJun 21, 10:32 UTC3h 19m
2026-06-21 UAL150 KIX → GUM Jun 21, 02:15 UTCJun 21, 02:30 UTC15m
2026-06-21 UAL151 GUM → KIX Jun 21, 00:25 UTCJun 21, 00:49 UTC25m
2026-06-20 UAL197 - Jun 20, 08:14 UTCJun 20, 08:55 UTC40m
2026-06-20 UAL196 - Jun 20, 04:59 UTCJun 20, 05:49 UTC50m
2026-06-19 UAL150 KIX → GUM Jun 19, 02:24 UTCJun 19, 02:39 UTC15m
2026-06-19 UAL151 GUM → KIX Jun 19, 01:04 UTCJun 19, 01:15 UTC10m
2026-06-18 UAL848 - Jun 18, 14:55 UTCJun 18, 15:25 UTC30m
2026-06-18 UAL849 - Jun 18, 12:30 UTCJun 18, 13:15 UTC45m
2026-06-17 UAL827 - Jun 17, 03:05 UTCJun 17, 03:40 UTC35m
2026-06-16 UAL873 - Jun 16, 09:55 UTCJun 16, 10:40 UTC45m
2026-06-15 UAL3940 DEN → SEA Jun 15, 06:30 UTCJun 15, 06:49 UTC20m
2026-06-15 UAL3940 DEN → SEA Jun 15, 06:03 UTCJun 15, 13:45 UTC7h 42m
2026-06-13 UAL133 MAJ → HNL Jun 13, 14:35 UTCJun 13, 14:50 UTC15m
2026-06-12 UAL865 NRT → GUM Jun 12, 09:10 UTCJun 12, 09:45 UTC35m
2026-06-12 UAL865 NRT → GUM Jun 12, 08:02 UTCJun 12, 12:19 UTC4h 17m
2026-06-12 UAL838 NRT → SFO Jun 12, 02:10 UTCJun 12, 05:20 UTC3h 10m
2026-06-12 UAL838 NRT → SFO Jun 12, 02:08 UTCJun 12, 05:18 UTC3h 10m
2026-06-11 UAL837 SFO → NRT Jun 11, 09:20 UTCJun 11, 10:35 UTC1h 15m
2026-06-11 UAL837 SFO → NRT Jun 11, 09:22 UTCJun 11, 12:49 UTC3h 27m

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 2h 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 UAL849, UAL848, UAL183, UAL155, UAL837.