Apparatus

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sensors Mode-S transponder

A12B32

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17459 · operated by UNITED AIRLINES INC

Hex
A12B32
Octal
50225462
Decimal
10,562,354
Country
US
Tail
N17459
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
107
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A12B32.

Country allocation

The ICAO 24-bit address A12B32 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
UAL3926 - 3 2026-07-03
UAL2025 - 3 2026-07-18
UAL1640 - 3 2026-07-08
UAL1215 - 3 2026-07-07
BOE959 - 3 2026-06-24
UAL730 - 2 2026-07-16
UAL4209 United Airlines 2 2026-06-27
UAL2805 - 2 2026-07-04
UAL2673 United Airlines 2 2026-07-22
UAL2636 - 2 2026-07-13
UAL2435 United Airlines 2 2026-07-26
UAL2412 - 2 2026-07-16
UAL2393 - 2 2026-07-15
UAL2330 - 2 2026-07-10
UAL2223 - 2 2026-07-07
UAL2144 - 2 2026-07-04
UAL2022 - 2 2026-07-18
UAL1892 - 2 2026-07-13
UAL1652 - 2 2026-07-12
UAL1572 United Airlines 2 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL780 IAD → LAS Jul 26, 22:10 UTCJul 26, 22:30 UTC20m
2026-07-26 UAL2435 IAD → SFO Jul 26, 17:35 UTCJul 26, 19:45 UTC2h 10m
2026-07-26 UAL1073 IAD → MIA Jul 26, 13:03 UTCJul 26, 15:31 UTC2h 28m
2026-07-26 UAL1073 IAD → MIA Jul 26, 13:20 UTCJul 26, 15:20 UTC2h 0m
2026-07-26 UAL1453 SJD → IAH Jul 26, 00:05 UTCJul 26, 04:35 UTC4h 30m
2026-07-25 UAL1265 DEN → SFO Jul 25, 17:30 UTCJul 25, 22:10 UTC4h 40m
2026-07-25 UAL544 LAX → SFO Jul 25, 12:30 UTCJul 25, 14:50 UTC2h 20m
2026-07-25 UAL1475 EWR → RSW Jul 25, 00:05 UTCJul 25, 02:05 UTC2h 0m
2026-07-24 UAL440 DEN → LAX Jul 24, 19:00 UTCJul 24, 22:05 UTC3h 5m
2026-07-24 UAL2137 ORD → SLC Jul 24, 13:55 UTCJul 24, 17:00 UTC3h 5m
2026-07-23 UAL2106 IAH → EWR Jul 23, 21:00 UTCJul 23, 23:50 UTC2h 50m
2026-07-23 UAL1620 FLL → EWR Jul 23, 15:50 UTCJul 23, 18:35 UTC2h 45m
2026-07-23 UAL1933 SNA → ORD Jul 23, 13:05 UTCJul 23, 14:10 UTC1h 5m
2026-07-23 UAL1625 EWR → DEN Jul 23, 04:25 UTCJul 23, 05:30 UTC1h 5m
2026-07-22 UAL1686 IAH → SNA Jul 22, 22:05 UTCJul 23, 01:05 UTC3h 0m
2026-07-22 UAL370 EWR → LAS Jul 22, 15:40 UTCJul 22, 20:20 UTC4h 40m
2026-07-22 UAL2673 ORD → LGA Jul 22, 11:45 UTCJul 22, 13:40 UTC1h 55m
2026-07-22 UAL2673 ORD → LGA Jul 22, 11:33 UTCJul 22, 13:38 UTC2h 5m
2026-07-22 UAL2678 ORD → SFO Jul 22, 01:05 UTCJul 22, 03:20 UTC2h 15m
2026-07-21 UAL408 - Jul 21, 13:15 UTCJul 21, 16:20 UTC3h 5m
2026-07-21 UAL1769 RDU → SFO Jul 21, 06:20 UTCJul 21, 11:30 UTC5h 10m
2026-07-20 UAL2810 MIA → SFO Jul 20, 23:50 UTCJul 21, 04:55 UTC5h 5m
2026-07-20 UAL2029 SFO → MIA Jul 20, 16:10 UTCJul 20, 21:30 UTC5h 20m
2026-07-20 UAL2363 PHL → ORD Jul 20, 13:10 UTCJul 20, 14:00 UTC50m
2026-07-20 UAL552 SFO → LAX Jul 20, 04:30 UTCJul 20, 05:35 UTC1h 5m
2026-07-20 UAL1572 DEN → EWR Jul 20, 01:25 UTCJul 20, 02:10 UTC45m
2026-07-19 UAL1572 DEN → EWR Jul 19, 21:40 UTCJul 19, 21:55 UTC15m
2026-07-19 UAL1798 - Jul 19, 14:25 UTCJul 19, 19:45 UTC5h 20m
2026-07-19 UAL1730 SEA → LAX Jul 19, 00:35 UTCJul 19, 03:00 UTC2h 25m
2026-07-18 UAL2241 EWR → SAT Jul 18, 17:45 UTCJul 18, 23:05 UTC5h 20m
2026-07-18 UAL2022 - Jul 18, 13:55 UTCJul 18, 14:50 UTC55m
2026-07-18 UAL2022 - Jul 18, 11:25 UTCJul 18, 11:40 UTC15m
2026-07-18 UAL2025 - Jul 18, 00:50 UTCJul 18, 01:10 UTC20m
2026-07-17 UAL2025 - Jul 17, 21:55 UTCJul 17, 22:35 UTC40m
2026-07-17 UAL2025 IAD → SJU Jul 17, 21:48 UTCJul 18, 01:01 UTC3h 13m
2026-07-17 UAL2435 - Jul 17, 17:40 UTCJul 17, 19:40 UTC2h 0m
2026-07-17 UAL1358 - Jul 17, 12:35 UTCJul 17, 15:10 UTC2h 35m
2026-07-17 UAL1210 EWR → ATL Jul 17, 00:55 UTCJul 17, 03:59 UTC3h 5m
2026-07-16 UAL1254 DEN → PHX Jul 16, 22:05 UTCJul 16, 23:25 UTC1h 20m
2026-07-16 UAL730 COS → DEN Jul 16, 19:47 UTCJul 16, 20:07 UTC20m
2026-07-16 UAL730 COS → DEN Jul 16, 19:45 UTCJul 16, 20:09 UTC25m
2026-07-16 UAL1111 DEN → COS Jul 16, 17:54 UTCJul 16, 18:15 UTC20m
2026-07-16 UAL1111 DEN → COS Jul 16, 17:54 UTCJul 16, 18:01 UTC7m
2026-07-16 UAL2412 - Jul 16, 12:55 UTCJul 16, 16:05 UTC3h 10m
2026-07-16 UAL2412 BWI → DEN Jul 16, 12:43 UTCJul 16, 16:02 UTC3h 19m
2026-07-16 UAL1605 - Jul 16, 06:25 UTCJul 16, 11:15 UTC4h 50m
2026-07-16 UAL2095 - Jul 16, 01:40 UTCJul 16, 04:35 UTC2h 55m
2026-07-15 UAL1183 - Jul 15, 20:05 UTCJul 15, 23:25 UTC3h 20m
2026-07-15 UAL2393 - Jul 15, 15:15 UTCJul 15, 18:35 UTC3h 20m
2026-07-15 UAL2393 IAH → BOS Jul 15, 15:10 UTCJul 15, 18:35 UTC3h 25m

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 N17459 page for operator, model, and routing details .

Mode-S A12B32 frequently asked

What is Mode-S code A12B32?
A12B32 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17459.
Where is Mode-S A12B32 registered?
Mode-S code A12B32 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 A12B32 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12B32, octal 50225462, decimal 10,562,354.
What flights does A12B32 operate?
Mode-S A12B32 has broadcast 20 distinct callsigns, including UAL3926, UAL2025, UAL1640, UAL1215, BOE959.