Apparatus

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sensors Mode-S transponder

A12709

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17320 · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
A12709
Octal
50223411
Decimal
10,561,289
Country
US
Tail
N17320
Type
B38M
Broadcasting now · callsign UAL1635 · 2,825 ft
Flights observed
410
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Current position

A12709 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A12709 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
UAL783 United Airlines 7 2026-05-19
UAL643 United Airlines 6 2026-05-28
UAL2446 United Airlines 6 2026-04-16
UAL359 United Airlines 5 2026-06-09
UAL2092 - 5 2026-06-24
UAL513 United Airlines 4 2026-06-26
UAL474 United Airlines 4 2026-06-09
UAL436 United Airlines 4 2026-04-14
UAL2621 - 4 2026-07-10
UAL2433 United Airlines 4 2026-05-29
UAL1769 - 4 2026-04-13
UAL1671 United Airlines 4 2026-04-16
UAL1339 - 4 2026-06-19
UAL784 United Airlines 3 2026-05-21
UAL725 - 3 2026-06-26
UAL700 United Airlines 3 2026-06-17
UAL394 - 3 2026-06-25
UAL280 - 3 2026-06-26
UAL2690 United Airlines 3 2026-05-18
UAL258 - 3 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL376 AUS → IAD Jul 13, 22:25 UTCJul 14, 01:10 UTC2h 45m
2026-07-13 UAL2746 IAD → AUS Jul 13, 17:30 UTCJul 13, 20:20 UTC2h 50m
2026-07-13 UAL204 ABQ → IAD Jul 13, 12:15 UTCJul 13, 15:45 UTC3h 30m
2026-07-12 UAL1822 IAD → ABQ Jul 12, 23:15 UTCJul 13, 02:25 UTC3h 10m
2026-07-12 UAL593 BZN → IAD Jul 12, 16:41 UTCJul 12, 20:05 UTC3h 24m
2026-07-11 UAL593 - Jul 11, 23:25 UTCJul 12, 20:10 UTC20h 45m
2026-07-11 UAL2170 BZN → IAH Jul 11, 18:57 UTCJul 11, 21:53 UTC2h 56m
2026-07-11 UAL2170 - Jul 11, 12:30 UTCJul 11, 21:55 UTC9h 25m
2026-07-11 UAL572 ANC → IAD Jul 11, 04:25 UTCJul 11, 11:00 UTC6h 35m
2026-07-10 UAL1592 DEN → ANC Jul 10, 22:05 UTCJul 11, 03:05 UTC5h 0m
2026-07-10 UAL757 SEA → DEN Jul 10, 18:15 UTCJul 10, 20:25 UTC2h 10m
2026-07-10 UAL2271 DEN → SEA Jul 10, 14:30 UTCJul 10, 16:50 UTC2h 20m
2026-07-10 UAL2271 DEN → SEA Jul 10, 14:19 UTCJul 10, 16:46 UTC2h 27m
2026-07-10 UAL361 AUS → DEN Jul 10, 10:50 UTCJul 10, 12:35 UTC1h 45m
2026-07-10 UAL2621 AUS → AUS Jul 10, 02:55 UTCJul 10, 03:15 UTC20m
2026-07-10 UAL2621 - Jul 10, 01:45 UTCJul 10, 02:15 UTC30m
2026-07-10 UAL2621 IAH → AUS Jul 10, 01:38 UTCJul 10, 02:16 UTC38m
2026-07-09 UAL2230 - Jul 9, 21:20 UTCJul 9, 23:40 UTC2h 20m
2026-07-09 UAL2231 - Jul 9, 17:10 UTCJul 9, 19:20 UTC2h 10m
2026-07-09 UAL1901 - Jul 9, 14:20 UTCJul 9, 14:50 UTC30m
2026-07-09 UAL1901 - Jul 9, 12:30 UTCJul 9, 12:40 UTC10m
2026-07-09 UAL1137 - Jul 9, 06:25 UTCJul 9, 07:30 UTC1h 5m
2026-07-09 UAL1137 LAX → GUA Jul 9, 06:11 UTCJul 9, 10:34 UTC4h 23m
2026-07-09 UAL418 - Jul 9, 03:20 UTCJul 9, 04:05 UTC45m
2026-07-08 UAL417 - Jul 8, 16:25 UTCJul 8, 16:55 UTC30m
2026-07-08 UAL417 LAX → OGG Jul 8, 16:18 UTCJul 8, 21:30 UTC5h 12m
2026-07-08 UAL2096 LAX → EWR Jul 8, 13:05 UTCJul 8, 14:10 UTC1h 5m
2026-07-08 UAL1898 LAX → RNO Jul 8, 02:37 UTCJul 8, 03:32 UTC55m
2026-07-07 UAL387 - Jul 7, 22:35 UTCJul 8, 00:55 UTC2h 20m
2026-07-07 UAL1134 EWR → YVR Jul 7, 15:05 UTCJul 7, 20:25 UTC5h 20m
2026-07-06 UAL1827 - Jul 6, 22:10 UTCJul 7, 03:00 UTC4h 50m
2026-07-06 UAL2399 - Jul 6, 17:25 UTCJul 6, 20:10 UTC2h 45m
2026-07-06 UAL1532 - Jul 6, 00:10 UTCJul 6, 15:20 UTC15h 10m
2026-07-05 UAL2674 - Jul 5, 18:25 UTCJul 5, 21:35 UTC3h 10m
2026-07-05 UAL2133 - Jul 5, 13:15 UTCJul 5, 16:20 UTC3h 5m
2026-07-05 UAL2083 - Jul 5, 07:10 UTCJul 5, 10:25 UTC3h 15m
2026-07-05 UAL1002 - Jul 5, 00:50 UTCJul 5, 02:15 UTC1h 25m
2026-07-04 UAL1002 - Jul 4, 23:30 UTCJul 4, 23:45 UTC15m
2026-07-04 UAL1002 IAH → UIO Jul 4, 23:31 UTCJul 5, 04:03 UTC4h 32m
2026-07-04 UAL527 - Jul 4, 20:55 UTCJul 4, 21:05 UTC10m
2026-07-04 UAL527 XPL → IAH Jul 4, 18:45 UTCJul 4, 21:03 UTC2h 18m
2026-07-04 UAL518 - Jul 4, 14:50 UTCJul 4, 19:45 UTC4h 55m
2026-07-04 UAL1450 - Jul 4, 10:15 UTCJul 4, 12:45 UTC2h 30m
2026-07-04 UAL2224 - Jul 4, 01:10 UTCJul 4, 03:55 UTC2h 45m
2026-07-04 UAL2224 IAH → DCA Jul 4, 01:08 UTCJul 4, 03:46 UTC2h 38m
2026-07-03 UAL1099 - Jul 3, 15:25 UTCJul 3, 23:10 UTC7h 45m
2026-07-03 UAL1552 FLL → EWR Jul 3, 07:25 UTCJul 3, 13:50 UTC6h 25m
2026-07-02 UAL2073 IAD → ANC Jul 2, 22:30 UTCJul 3, 05:10 UTC6h 40m
2026-07-02 UAL2250 - Jul 2, 17:05 UTCJul 2, 20:10 UTC3h 5m
2026-07-02 UAL1789 - Jul 2, 12:50 UTCJul 2, 15:40 UTC2h 50m

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 N17320 page for operator, model, and routing details .

Mode-S A12709 frequently asked

What is Mode-S code A12709?
A12709 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17320.
Where is Mode-S A12709 registered?
Mode-S code A12709 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 A12709 broadcasting right now?
Yes. Mode-S A12709 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12709, octal 50223411, decimal 10,561,289.
What flights does A12709 operate?
Mode-S A12709 has broadcast 20 distinct callsigns, including UAL783, UAL643, UAL2446, UAL359, UAL2092.