Apparatus

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sensors Mode-S transponder

A126ED

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17317 · BOEING 737 MAX 8 · operated by UNITED AIRLINES INC

Hex
A126ED
Octal
50223355
Decimal
10,561,261
Country
US
Tail
N17317
Type
B38M
No current signal · last broadcast 3h ago
Flights observed
322
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A126ED.

Country allocation

The ICAO 24-bit address A126ED 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
UAL508 United Airlines 6 2026-04-21
UAL1545 United Airlines 6 2026-05-17
UAL438 United Airlines 5 2026-04-22
UAL2083 - 5 2026-06-29
UAL205 - 5 2026-06-22
UAL1093 - 5 2026-07-13
UAL269 United Airlines 4 2026-06-07
UAL1903 - 4 2026-06-28
UAL1751 - 4 2026-06-28
UAL1632 United Airlines 4 2026-04-27
UAL1433 United Airlines 4 2026-04-19
UAL783 - 3 2026-06-19
UAL679 United Airlines 3 2026-04-17
UAL608 - 3 2026-06-16
UAL2349 - 3 2026-07-12
UAL2285 - 3 2026-06-18
UAL2170 - 3 2026-06-21
UAL209 United Airlines 3 2026-06-07
UAL1955 - 3 2026-07-09
UAL1876 - 3 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL1296 - Jul 13, 23:20 UTCJul 13, 23:35 UTC15m
2026-07-13 UAL1295 - Jul 13, 16:05 UTCJul 13, 21:10 UTC5h 5m
2026-07-13 UAL1093 - Jul 13, 12:15 UTCJul 13, 14:10 UTC1h 55m
2026-07-13 UAL1093 LAX → BWI Jul 13, 12:22 UTCJul 13, 14:00 UTC1h 38m
2026-07-13 UAL1218 SEA → DEN Jul 13, 03:01 UTCJul 13, 05:10 UTC2h 10m
2026-07-12 UAL2279 SFO → SEA Jul 12, 23:50 UTCJul 13, 01:15 UTC1h 25m
2026-07-12 UAL2349 LIR → SFO Jul 12, 14:43 UTCJul 12, 20:41 UTC5h 58m
2026-07-11 UAL2349 - Jul 11, 21:20 UTCJul 12, 20:45 UTC23h 25m
2026-07-11 UAL2349 - Jul 11, 19:20 UTCJul 12, 19:15 UTC23h 55m
2026-07-11 UAL2139 - Jul 11, 18:25 UTCJul 12, 17:15 UTC22h 50m
2026-07-11 UAL1372 - Jul 11, 15:20 UTCJul 11, 16:15 UTC55m
2026-07-11 UAL1612 - Jul 11, 08:45 UTCJul 11, 13:30 UTC4h 45m
2026-07-11 UAL1104 - Jul 11, 00:35 UTCJul 11, 05:50 UTC5h 15m
2026-07-10 UAL2146 - Jul 10, 19:25 UTCJul 10, 21:50 UTC2h 25m
2026-07-10 UAL1914 IAD → YVR Jul 10, 12:45 UTCJul 10, 17:50 UTC5h 5m
2026-07-10 UAL564 YVR → IAD Jul 10, 05:35 UTCJul 10, 09:55 UTC4h 20m
2026-07-10 UAL2429 SFO → YVR Jul 10, 02:05 UTCJul 10, 03:55 UTC1h 50m
2026-07-09 UAL1955 - Jul 9, 22:55 UTCJul 10, 00:30 UTC1h 35m
2026-07-09 UAL1840 DEN → SLC Jul 9, 20:05 UTCJul 9, 21:35 UTC1h 30m
2026-07-09 UAL716 LGA → DEN Jul 9, 14:15 UTCJul 9, 18:00 UTC3h 45m
2026-07-08 UAL1579 DEN → LGA Jul 8, 20:10 UTCJul 8, 23:25 UTC3h 15m
2026-07-08 UAL1327 ATL → DEN Jul 8, 15:30 UTCJul 8, 18:05 UTC2h 35m
2026-07-08 UAL1287 EWR → ATL Jul 8, 00:58 UTCJul 8, 02:41 UTC1h 43m
2026-07-08 UAL1287 EWR → ATL Jul 8, 01:00 UTCJul 8, 02:45 UTC1h 45m
2026-07-07 UAL2359 - Jul 7, 17:40 UTCJul 7, 22:20 UTC4h 40m
2026-07-07 UAL1613 EWR → FLL Jul 7, 10:45 UTCJul 7, 16:00 UTC5h 15m
2026-07-07 UAL1731 - Jul 7, 03:05 UTCJul 7, 03:20 UTC15m
2026-07-06 UAL1731 - Jul 6, 22:45 UTCJul 7, 03:00 UTC4h 15m
2026-07-06 UAL1631 EWR → LAS Jul 6, 13:25 UTCJul 6, 18:00 UTC4h 35m
2026-07-06 UAL2132 SMF → EWR Jul 6, 06:20 UTCJul 6, 11:05 UTC4h 45m
2026-07-05 UAL2624 LGA → DEN Jul 5, 23:15 UTCJul 6, 04:50 UTC5h 35m
2026-07-05 UAL231 - Jul 5, 13:20 UTCJul 5, 20:20 UTC7h 0m
2026-07-05 UAL230 - Jul 5, 02:55 UTCJul 5, 09:00 UTC6h 5m
2026-07-04 UAL1226 - Jul 4, 13:20 UTCJul 4, 23:30 UTC10h 10m
2026-07-04 UAL363 EWR → HNL Jul 4, 04:38 UTCJul 4, 11:04 UTC6h 26m
2026-07-04 UAL363 EWR → HNL Jul 4, 04:35 UTCJul 4, 11:05 UTC6h 30m
2026-07-03 UAL450 - Jul 3, 20:25 UTCJul 4, 03:20 UTC6h 55m
2026-07-03 UAL1064 MEX → EWR Jul 3, 13:50 UTCJul 3, 18:15 UTC4h 25m
2026-07-02 UAL1065 EWR → MEX Jul 2, 19:35 UTCJul 3, 00:00 UTC4h 25m
2026-07-02 UAL1992 - Jul 2, 13:10 UTCJul 2, 17:35 UTC4h 25m
2026-07-01 UAL2858 EWR → MSY Jul 1, 21:15 UTCJul 2, 01:50 UTC4h 35m
2026-07-01 UAL1975 LAS → EWR Jul 1, 14:15 UTCJul 1, 19:00 UTC4h 45m
2026-07-01 UAL2839 - Jul 1, 07:05 UTCJul 1, 08:05 UTC1h 0m
2026-07-01 UAL2839 SFO → LAS Jul 1, 07:03 UTCJul 1, 08:06 UTC1h 3m
2026-07-01 UAL1083 - Jul 1, 03:30 UTCJul 1, 05:20 UTC1h 50m
2026-06-30 UAL1086 DEN → YVR Jun 30, 23:30 UTCJul 1, 02:05 UTC2h 35m
2026-06-30 UAL1541 AUS → DEN Jun 30, 18:12 UTCJun 30, 19:41 UTC1h 29m
2026-06-30 UAL1541 AUS → DEN Jun 30, 18:05 UTCJun 30, 19:45 UTC1h 40m
2026-06-30 UAL456 DEN → AUS Jun 30, 14:15 UTCJun 30, 16:05 UTC1h 50m
2026-06-30 UAL361 AUS → DEN Jun 30, 10:45 UTCJun 30, 12:30 UTC1h 45m

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 N17317 page for operator, model, and routing details .

Mode-S A126ED frequently asked

What is Mode-S code A126ED?
A126ED is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17317.
Where is Mode-S A126ED registered?
Mode-S code A126ED 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 A126ED 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 A126ED, octal 50223355, decimal 10,561,261.
What flights does A126ED operate?
Mode-S A126ED has broadcast 20 distinct callsigns, including UAL508, UAL1545, UAL438, UAL2083, UAL205.