Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A12AC8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17428 · BOEING 737 MAX 9 · operated by UNITED AIRLINES INC

Hex
A12AC8
Octal
50225310
Decimal
10,562,248
Country
US
Tail
N17428
Type
B39M
No current signal · last broadcast Jul 26, 21:35 UTC
Flights observed
452
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S A12AC8.

Country allocation

The ICAO 24-bit address A12AC8 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
UAL2372 - 8 2026-07-08
UAL1266 - 7 2026-07-08
UAL582 United Airlines 5 2026-04-24
UAL2373 - 5 2026-07-07
UAL1467 - 5 2026-07-08
UAL1250 United Airlines 5 2026-06-18
UAL8173 United Airlines 4 2026-06-10
UAL701 United Airlines 4 2026-07-22
UAL2044 - 4 2026-06-28
UAL2022 United Airlines 4 2026-06-08
UAL1975 United Airlines 4 2026-05-12
UAL1730 - 4 2026-06-18
UAL1497 United Airlines 4 2026-06-03
UAL8253 United Airlines 3 2026-06-04
UAL797 United Airlines 3 2026-04-17
UAL418 United Airlines 3 2026-04-27
UAL308 - 3 2026-07-04
UAL2858 United Airlines 3 2026-06-29
UAL2801 United Airlines 3 2026-07-26
UAL2667 United Airlines 3 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1710 JAX → ORD Jul 26, 18:00 UTCJul 26, 21:35 UTC3h 35m
2026-07-26 UAL2428 PHX → EWR Jul 26, 12:45 UTCJul 26, 16:20 UTC3h 35m
2026-07-26 UAL2801 FRA → SFO Jul 26, 01:35 UTCJul 26, 02:10 UTC35m
2026-07-25 UAL2801 FRA → SFO Jul 25, 23:56 UTCJul 26, 01:56 UTC2h 0m
2026-07-25 UAL2801 FRA → SFO Jul 25, 23:55 UTCJul 26, 01:30 UTC1h 35m
2026-07-25 UAL1057 DEN → SFO Jul 25, 20:15 UTCJul 25, 22:20 UTC2h 5m
2026-07-25 UAL2329 RNO → SFO Jul 25, 16:00 UTCJul 25, 18:10 UTC2h 10m
2026-07-25 UAL2329 RNO → SFO Jul 25, 16:01 UTCJul 25, 17:46 UTC1h 45m
2026-07-25 UAL2806 BOG → EWR Jul 25, 11:20 UTCJul 25, 13:20 UTC2h 0m
2026-07-25 UAL2229 EWR → SRQ Jul 25, 00:35 UTCJul 25, 02:40 UTC2h 5m
2026-07-24 UAL8155 CDG → YYZ Jul 24, 17:31 UTCJul 24, 22:14 UTC4h 43m
2026-07-24 UAL8155 CDG → YYZ Jul 24, 17:20 UTCJul 24, 22:15 UTC4h 55m
2026-07-24 UAL2661 PHL → ORD Jul 24, 10:15 UTCJul 24, 15:40 UTC5h 25m
2026-07-24 UAL2619 DEN → MSP Jul 24, 01:25 UTCJul 24, 05:55 UTC4h 30m
2026-07-23 UAL1754 MSN → ORD Jul 23, 22:45 UTCJul 23, 23:55 UTC1h 10m
2026-07-23 UAL337 DEN → DFW Jul 23, 17:50 UTCJul 23, 20:00 UTC2h 10m
2026-07-23 UAL2052 IAH → MSY Jul 23, 12:00 UTCJul 23, 16:05 UTC4h 5m
2026-07-23 UAL2052 IAH → MSY Jul 23, 11:59 UTCJul 23, 16:04 UTC4h 5m
2026-07-23 UAL2254 PDX → DEN Jul 23, 00:45 UTCJul 23, 03:55 UTC3h 10m
2026-07-22 UAL1263 - Jul 22, 20:45 UTCJul 22, 23:25 UTC2h 40m
2026-07-22 UAL1263 ONT → DEN Jul 22, 20:36 UTCJul 22, 23:22 UTC2h 46m
2026-07-22 UAL2661 PHL → ORD Jul 22, 18:06 UTCJul 22, 18:50 UTC44m
2026-07-22 UAL2661 PHL → ORD Jul 22, 17:55 UTCJul 22, 18:55 UTC1h 0m
2026-07-22 UAL1768 EWR → DEN Jul 22, 12:35 UTCJul 22, 16:00 UTC3h 25m
2026-07-22 UAL701 MSY → EWR Jul 22, 00:05 UTCJul 22, 00:25 UTC20m
2026-07-21 UAL701 MSY → EWR Jul 21, 20:15 UTCJul 21, 22:30 UTC2h 15m
2026-07-21 UAL2638 - Jul 21, 15:50 UTCJul 21, 17:50 UTC2h 0m
2026-07-21 UAL1150 PHX → EWR Jul 21, 11:15 UTCJul 21, 13:50 UTC2h 35m
2026-07-21 UAL8124 - Jul 21, 01:10 UTCJul 21, 03:10 UTC2h 0m
2026-07-20 UAL1570 - Jul 20, 17:15 UTCJul 20, 22:55 UTC5h 40m
2026-07-20 UAL2611 LAX → SFO Jul 20, 13:30 UTCJul 20, 15:30 UTC2h 0m
2026-07-14 UAL1190 - Jul 14, 00:50 UTCJul 14, 02:55 UTC2h 5m
2026-07-13 UAL2796 - Jul 13, 21:05 UTCJul 13, 23:00 UTC1h 55m
2026-07-13 UAL2678 - Jul 13, 17:10 UTCJul 13, 19:00 UTC1h 50m
2026-07-13 UAL2455 RSW → EWR Jul 13, 10:15 UTCJul 13, 12:35 UTC2h 20m
2026-07-12 UAL8145 EWR → RSW Jul 12, 23:34 UTCJul 13, 02:04 UTC2h 30m
2026-07-12 UAL8145 - Jul 12, 23:45 UTCJul 13, 02:10 UTC2h 25m
2026-07-12 UAL2371 - Jul 12, 17:45 UTCJul 12, 20:55 UTC3h 10m
2026-07-12 UAL2371 IAH → EWR Jul 12, 17:41 UTCJul 12, 20:52 UTC3h 11m
2026-07-12 UAL2417 - Jul 12, 13:01 UTCJul 12, 15:20 UTC2h 20m
2026-07-11 UAL2180 - Jul 11, 23:35 UTCJul 12, 02:10 UTC2h 35m
2026-07-11 UAL2458 - Jul 11, 19:00 UTCJul 11, 20:00 UTC1h 0m
2026-07-11 UAL2458 IAH → ORD Jul 11, 19:03 UTCJul 11, 20:49 UTC1h 46m
2026-07-11 UAL1249 - Jul 11, 13:35 UTCJul 11, 16:50 UTC3h 15m
2026-07-11 UAL392 - Jul 11, 05:05 UTCJul 11, 07:15 UTC2h 10m
2026-07-11 UAL392 EWR → PTY Jul 11, 04:12 UTCJul 11, 09:31 UTC5h 19m
2026-07-10 UAL1043 - Jul 10, 22:05 UTCJul 11, 02:10 UTC4h 5m
2026-07-10 UAL1042 - Jul 10, 16:10 UTCJul 10, 20:10 UTC4h 0m
2026-07-10 UAL577 MCO → EWR Jul 10, 12:10 UTCJul 10, 14:15 UTC2h 5m
2026-07-09 UAL1571 - Jul 9, 22:30 UTCJul 10, 00:25 UTC1h 55m

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 N17428 page for operator, model, and routing details .

Mode-S A12AC8 frequently asked

What is Mode-S code A12AC8?
A12AC8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17428.
Where is Mode-S A12AC8 registered?
Mode-S code A12AC8 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 A12AC8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12AC8, octal 50225310, decimal 10,562,248.
What flights does A12AC8 operate?
Mode-S A12AC8 has broadcast 20 distinct callsigns, including UAL2372, UAL1266, UAL582, UAL2373, UAL1467.