Apparatus

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sensors Mode-S transponder

A12711

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17328 · BOEING 737 MAX 8 · operated by UNITED AIRLINES INC

Hex
A12711
Octal
50223421
Decimal
10,561,297
Country
US
Tail
N17328
Type
B38M
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
446
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A12711.

Country allocation

The ICAO 24-bit address A12711 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
UAL417 United Airlines 6 2026-07-23
UAL841 United Airlines 5 2026-05-12
UAL784 United Airlines 5 2026-05-20
UAL1903 United Airlines 5 2026-06-12
UAL834 United Airlines 4 2026-05-13
UAL783 United Airlines 4 2026-05-17
UAL448 United Airlines 4 2026-06-01
UAL368 United Airlines 4 2026-07-22
UAL2448 United Airlines 4 2026-06-11
UAL1826 United Airlines 4 2026-04-13
UAL1751 United Airlines 4 2026-06-12
UAL1678 United Airlines 4 2026-07-22
UAL1589 United Airlines 4 2026-06-11
UAL1245 United Airlines 4 2026-06-09
UAL1244 United Airlines 4 2026-06-09
UAL601 - 3 2026-07-03
UAL598 - 3 2026-06-23
UAL584 United Airlines 3 2026-06-13
UAL481 United Airlines 3 2026-05-13
UAL2858 United Airlines 3 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2249 PHX → SFO Jul 26, 19:35 UTCJul 26, 22:15 UTC2h 40m
2026-07-26 UAL2421 MCO → ORD Jul 26, 16:05 UTCJul 26, 17:50 UTC1h 45m
2026-07-26 UAL1353 IAD → EWR Jul 26, 12:45 UTCJul 26, 14:35 UTC1h 50m
2026-07-26 UAL206 BOG → IAH Jul 26, 05:40 UTCJul 26, 09:55 UTC4h 16m
2026-07-25 UAL268 EWR → BOG Jul 25, 22:00 UTCJul 26, 02:40 UTC4h 40m
2026-07-25 UAL268 EWR → BOG Jul 25, 21:55 UTCJul 26, 02:15 UTC4h 20m
2026-07-25 UAL1975 BOS → EWR Jul 25, 14:20 UTCJul 25, 18:40 UTC4h 20m
2026-07-24 UAL1864 DEN → IAH Jul 24, 16:50 UTCJul 24, 21:35 UTC4h 45m
2026-07-24 UAL2468 TPA → EWR Jul 24, 14:30 UTCJul 24, 15:25 UTC55m
2026-07-24 UAL2641 SFO → SAN Jul 24, 09:15 UTCJul 24, 13:10 UTC3h 55m
2026-07-24 UAL418 SAN → SFO Jul 24, 03:10 UTCJul 24, 04:05 UTC55m
2026-07-23 UAL417 LAX → OGG Jul 23, 21:35 UTCJul 23, 21:45 UTC10m
2026-07-23 UAL417 LAX → OGG Jul 23, 16:30 UTCJul 23, 16:55 UTC25m
2026-07-23 UAL417 LAX → OGG Jul 23, 16:18 UTCJul 23, 21:44 UTC5h 26m
2026-07-23 UAL2039 LAX → ORD Jul 23, 13:05 UTCJul 23, 13:45 UTC40m
2026-07-23 UAL2839 TPA → SFO Jul 23, 07:45 UTCJul 23, 08:50 UTC1h 5m
2026-07-22 UAL368 EWR → FLL Jul 22, 22:55 UTCJul 23, 04:20 UTC5h 25m
2026-07-22 UAL1678 SFO → IAH Jul 22, 15:50 UTCJul 22, 20:20 UTC4h 30m
2026-07-22 UAL1299 SFO → DEN Jul 22, 01:15 UTCJul 22, 05:25 UTC4h 10m
2026-07-22 UAL1299 SFO → DEN Jul 22, 01:09 UTCJul 22, 05:24 UTC4h 15m
2026-07-21 UAL1298 - Jul 21, 23:30 UTCJul 21, 23:50 UTC20m
2026-07-21 UAL1298 SFO → LIH Jul 21, 18:46 UTCJul 21, 23:57 UTC5h 11m
2026-07-21 UAL1298 - Jul 21, 18:40 UTCJul 21, 19:15 UTC35m
2026-07-21 UAL1257 DEN → LGA Jul 21, 12:05 UTCJul 21, 17:05 UTC5h 0m
2026-07-20 UAL2180 - Jul 20, 23:50 UTCJul 21, 02:20 UTC2h 30m
2026-07-20 UAL224 ORD → EWR Jul 20, 14:40 UTCJul 20, 21:40 UTC7h 0m
2026-07-20 UAL723 - Jul 20, 10:15 UTCJul 20, 12:30 UTC2h 15m
2026-07-19 UAL1401 - Jul 19, 23:45 UTCJul 20, 01:30 UTC1h 45m
2026-07-19 UAL2202 - Jul 19, 14:50 UTCJul 19, 22:00 UTC7h 10m
2026-07-18 UAL799 LAX → SFO Jul 18, 22:58 UTCJul 19, 00:56 UTC1h 58m
2026-07-18 UAL799 LAX → SFO Jul 18, 21:50 UTCJul 18, 22:30 UTC40m
2026-07-18 UAL2119 EWR → GCM Jul 18, 16:25 UTCJul 18, 19:00 UTC2h 35m
2026-07-18 UAL2119 EWR → GCM Jul 18, 14:11 UTCJul 18, 19:49 UTC5h 38m
2026-07-17 UAL1446 - Jul 17, 23:39 UTCJul 18, 00:15 UTC35m
2026-07-17 UAL1446 LIR → EWR Jul 17, 23:28 UTCJul 18, 04:14 UTC4h 46m
2026-07-17 UAL1917 DEN → LIR Jul 17, 16:29 UTCJul 17, 21:19 UTC4h 50m
2026-07-17 UAL1917 DEN → LIR Jul 17, 16:44 UTCJul 17, 20:35 UTC3h 50m
2026-07-16 UAL235 ATL → DEN Jul 16, 20:49 UTCJul 16, 23:25 UTC2h 35m
2026-07-16 UAL235 ATL → DEN Jul 16, 20:41 UTCJul 16, 23:19 UTC2h 38m
2026-07-16 UAL2424 DEN → ATL Jul 16, 16:25 UTCJul 16, 18:59 UTC2h 35m
2026-07-16 UAL621 ABQ → DEN Jul 16, 13:20 UTCJul 16, 14:20 UTC1h 0m
2026-07-16 UAL621 ABQ → DEN Jul 16, 13:13 UTCJul 16, 14:16 UTC1h 3m
2026-07-16 UAL484 DEN → ABQ Jul 16, 01:40 UTCJul 16, 02:30 UTC50m
2026-07-15 UAL1781 - Jul 15, 22:35 UTCJul 15, 23:55 UTC1h 20m
2026-07-15 UAL1781 DSM → DEN Jul 15, 22:35 UTCJul 15, 23:50 UTC1h 15m
2026-07-15 UAL1311 DEN → DSM Jul 15, 19:50 UTCJul 15, 21:10 UTC1h 20m
2026-07-15 UAL1824 BZN → DEN Jul 15, 17:14 UTCJul 15, 18:23 UTC1h 9m
2026-07-15 UAL1824 DEN → DEN Jul 15, 13:55 UTCJul 15, 18:30 UTC4h 35m
2026-07-15 UAL2436 SFO → DEN Jul 15, 02:15 UTCJul 15, 04:15 UTC2h 0m
2026-07-14 UAL1955 - Jul 14, 22:30 UTCJul 15, 00:20 UTC1h 49m

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 N17328 page for operator, model, and routing details .

Mode-S A12711 frequently asked

What is Mode-S code A12711?
A12711 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17328.
Where is Mode-S A12711 registered?
Mode-S code A12711 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 A12711 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12711, octal 50223421, decimal 10,561,297.
What flights does A12711 operate?
Mode-S A12711 has broadcast 20 distinct callsigns, including UAL417, UAL841, UAL784, UAL1903, UAL834.