Apparatus

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sensors Mode-S transponder

A12F4C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17583 · operated by UMB BANK NA TRUSTEE

Hex
A12F4C
Octal
50227514
Decimal
10,563,404
Country
US
Tail
N17583
Type
B39M
No current signal · last broadcast 2h ago
Flights observed
407
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A12F4C.

Country allocation

The ICAO 24-bit address A12F4C 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
UAL1863 United Airlines 6 2026-04-28
UAL665 - 4 2026-07-12
UAL630 United Airlines 4 2026-04-17
UAL2862 United Airlines 4 2026-04-15
UAL2435 - 4 2026-06-25
UAL2387 United Airlines 4 2026-06-02
UAL1947 - 4 2026-07-08
UAL1871 United Airlines 4 2026-04-21
UAL1804 United Airlines 4 2026-06-22
UAL1768 United Airlines 4 2026-05-31
UAL1742 - 4 2026-06-26
UAL1706 United Airlines 4 2026-04-20
UAL1624 - 4 2026-07-12
UAL1473 United Airlines 4 2026-06-07
UAL8123 United Airlines 3 2026-05-01
UAL693 - 3 2026-07-10
UAL638 United Airlines 3 2026-04-22
UAL637 United Airlines 3 2026-05-08
UAL469 United Airlines 3 2026-04-28
UAL407 United Airlines 3 2026-05-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL2353 - Jul 14, 22:30 UTCJul 15, 03:00 UTC4h 29m
2026-07-14 UAL277 - Jul 14, 17:30 UTCJul 14, 20:30 UTC3h 0m
2026-07-14 UAL2600 - Jul 14, 12:55 UTCJul 14, 16:00 UTC3h 5m
2026-07-13 UAL2782 - Jul 13, 23:15 UTCJul 14, 02:10 UTC2h 55m
2026-07-13 UAL1403 - Jul 13, 13:15 UTCJul 13, 18:15 UTC5h 0m
2026-07-13 UAL2641 EWR → LAX Jul 13, 02:50 UTCJul 13, 07:22 UTC4h 32m
2026-07-13 UAL2641 - Jul 13, 02:45 UTCJul 13, 07:25 UTC4h 40m
2026-07-12 UAL665 - Jul 12, 22:55 UTCJul 12, 23:55 UTC1h 0m
2026-07-12 UAL1624 - Jul 12, 16:05 UTCJul 12, 17:05 UTC1h 0m
2026-07-12 UAL1624 EWR → STI Jul 12, 15:56 UTCJul 12, 19:16 UTC3h 20m
2026-07-11 UAL240 EWR → EWR Jul 11, 23:55 UTCJul 12, 13:30 UTC13h 35m
2026-07-11 UAL1837 POP → EWR Jul 11, 17:54 UTCJul 11, 21:09 UTC3h 15m
2026-07-11 UAL1078 - Jul 11, 12:55 UTCJul 11, 20:55 UTC8h 0m
2026-07-11 UAL1833 BOS → EWR Jul 11, 10:22 UTCJul 11, 11:28 UTC1h 6m
2026-07-11 UAL1833 BOS → EWR Jul 11, 10:30 UTCJul 11, 11:30 UTC1h 0m
2026-07-10 UAL1372 - Jul 10, 19:45 UTCJul 11, 00:35 UTC4h 50m
2026-07-10 UAL1668 AUS → SFO Jul 10, 14:25 UTCJul 10, 17:40 UTC3h 15m
2026-07-10 UAL1807 SFO → AUS Jul 10, 07:43 UTCJul 10, 10:37 UTC2h 54m
2026-07-10 UAL1807 SFO → AUS Jul 10, 07:35 UTCJul 10, 10:40 UTC3h 5m
2026-07-10 UAL693 - Jul 10, 00:05 UTCJul 10, 00:20 UTC15m
2026-07-10 UAL693 KOA → SFO Jul 10, 00:03 UTCJul 10, 04:41 UTC4h 38m
2026-07-10 UAL693 KOA → SFO Jul 10, 00:03 UTCJul 10, 04:45 UTC4h 42m
2026-07-09 UAL694 SFO → KOA Jul 9, 22:10 UTCJul 9, 22:20 UTC10m
2026-07-09 UAL694 SFO → KOA Jul 9, 17:25 UTCJul 9, 18:00 UTC35m
2026-07-09 UAL1550 - Jul 9, 11:20 UTCJul 9, 15:55 UTC4h 35m
2026-07-09 UAL234 - Jul 9, 05:00 UTCJul 9, 09:25 UTC4h 25m
2026-07-09 UAL234 CLE → SFO Jul 9, 04:55 UTCJul 9, 09:22 UTC4h 27m
2026-07-08 UAL2462 YYZ → SFO Jul 8, 22:20 UTCJul 9, 03:15 UTC4h 55m
2026-07-08 UAL608 - Jul 8, 15:30 UTCJul 8, 19:50 UTC4h 20m
2026-07-08 UAL1947 - Jul 8, 02:20 UTCJul 8, 07:10 UTC4h 50m
2026-07-08 UAL1947 HNL → SFO Jul 8, 02:08 UTCJul 8, 07:05 UTC4h 57m
2026-07-08 UAL1260 SNA → SFO Jul 8, 00:10 UTCJul 8, 00:25 UTC15m
2026-07-07 UAL1260 SNA → SFO Jul 7, 19:45 UTCJul 7, 20:15 UTC30m
2026-07-07 UAL1668 AUS → SFO Jul 7, 14:10 UTCJul 7, 17:25 UTC3h 15m
2026-07-07 UAL1943 DEN → AUS Jul 7, 04:05 UTCJul 7, 05:40 UTC1h 35m
2026-07-06 UAL2852 - Jul 6, 22:15 UTCJul 7, 01:55 UTC3h 40m
2026-07-06 UAL2295 EWR → MIA Jul 6, 16:45 UTCJul 6, 19:50 UTC3h 5m
2026-07-06 UAL2295 EWR → MIA Jul 6, 16:26 UTCJul 6, 19:52 UTC3h 26m
2026-07-05 UAL240 - Jul 5, 23:55 UTCJul 6, 14:00 UTC14h 5m
2026-07-05 UAL1574 LAS → SFO Jul 5, 18:20 UTCJul 5, 21:25 UTC3h 5m
2026-07-05 UAL1574 LAS → SFO Jul 5, 18:13 UTCJul 5, 21:30 UTC3h 17m
2026-07-05 UAL454 EWR → DFW Jul 5, 13:20 UTCJul 5, 16:15 UTC2h 55m
2026-07-05 UAL1525 - Jul 5, 10:40 UTCJul 5, 11:50 UTC1h 10m
2026-07-05 UAL376 - Jul 5, 03:45 UTCJul 5, 04:45 UTC1h 0m
2026-07-04 UAL1053 CUN → EWR Jul 4, 21:20 UTCJul 5, 00:40 UTC3h 20m
2026-07-04 UAL1177 ATL → EWR Jul 4, 16:05 UTCJul 4, 19:30 UTC3h 25m
2026-07-04 UAL2806 - Jul 4, 11:20 UTCJul 4, 13:30 UTC2h 10m
2026-07-04 UAL352 DEN → ORD Jul 4, 06:46 UTCJul 4, 09:23 UTC2h 37m
2026-07-04 UAL352 DEN → ORD Jul 4, 06:45 UTCJul 4, 08:45 UTC2h 0m
2026-07-03 UAL1150 - Jul 3, 21:25 UTCJul 3, 23:45 UTC2h 20m

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 N17583 page for operator, model, and routing details .

Mode-S A12F4C frequently asked

What is Mode-S code A12F4C?
A12F4C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17583.
Where is Mode-S A12F4C registered?
Mode-S code A12F4C 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 A12F4C 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 A12F4C, octal 50227514, decimal 10,563,404.
What flights does A12F4C operate?
Mode-S A12F4C has broadcast 20 distinct callsigns, including UAL1863, UAL665, UAL630, UAL2862, UAL2435.