Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A12AA0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17413 · BOEING 737 MAX 9 · operated by BOEING CO

Hex
A12AA0
Octal
50225240
Decimal
10,562,208
Country
US
Tail
N17413
Type
B39M
No current signal · last broadcast Jul 25, 04:10 UTC
Flights observed
453
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 04:10 UTC

Last known position

Most recent position reported by Mode-S A12AA0.

Country allocation

The ICAO 24-bit address A12AA0 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
UAL1031 United Airlines 13 2026-07-24
UAL1250 United Airlines 10 2026-07-23
UAL2372 - 6 2026-06-26
UAL1674 United Airlines 6 2026-06-28
UAL1039 - 6 2026-06-29
UAL2373 - 5 2026-06-25
UAL1742 - 5 2026-06-23
UAL1644 United Airlines 5 2026-07-23
UAL1543 United Airlines 5 2026-06-07
UAL620 United Airlines 4 2026-06-06
UAL2452 United Airlines 4 2026-06-06
UAL2219 United Airlines 4 2026-06-07
UAL722 - 3 2026-04-20
UAL701 United Airlines 3 2026-04-15
UAL2855 - 3 2026-07-20
UAL2777 - 3 2026-07-04
UAL2492 - 3 2026-07-16
UAL2489 - 3 2026-06-29
UAL2451 United Airlines 3 2026-05-11
UAL2330 - 3 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UAL519 DEN → SFO Jul 25, 02:05 UTCJul 25, 04:05 UTC2h 0m
2026-07-24 UAL2751 PDX → SFO Jul 24, 21:45 UTCJul 25, 00:20 UTC2h 35m
2026-07-24 UAL1031 PTY → IAH Jul 24, 16:40 UTCJul 24, 18:50 UTC2h 10m
2026-07-23 UAL1031 PTY → IAH Jul 23, 20:05 UTCJul 24, 18:50 UTC22h 45m
2026-07-23 UAL1250 LAX → SFO Jul 23, 18:05 UTCJul 24, 17:30 UTC23h 25m
2026-07-23 UAL1250 LAX → SFO Jul 23, 17:30 UTCJul 23, 20:00 UTC2h 30m
2026-07-23 UAL1250 LAX → SFO Jul 23, 17:16 UTCJul 23, 21:18 UTC4h 2m
2026-07-23 UAL1644 SJU → IAH Jul 23, 12:55 UTCJul 23, 15:15 UTC2h 20m
2026-07-23 UAL1644 SJU → IAH Jul 23, 11:10 UTCJul 23, 11:20 UTC10m
2026-07-23 UAL1497 SFO → IAH Jul 23, 09:05 UTCJul 23, 09:20 UTC15m
2026-07-23 UAL1497 SFO → IAH Jul 23, 05:10 UTCJul 23, 07:25 UTC2h 15m
2026-07-23 UAL265 ABQ → ORD Jul 23, 00:25 UTCJul 23, 03:30 UTC3h 5m
2026-07-22 UAL1397 DEN → ORD Jul 22, 19:15 UTCJul 22, 22:10 UTC2h 55m
2026-07-22 UAL1397 DEN → ORD Jul 22, 14:35 UTCJul 22, 17:30 UTC2h 55m
2026-07-22 UAL1103 DEN → BOS Jul 22, 01:35 UTCJul 22, 02:15 UTC40m
2026-07-21 UAL1103 DEN → BOS Jul 21, 21:35 UTCJul 21, 21:50 UTC15m
2026-07-21 UAL1581 - Jul 21, 14:30 UTCJul 21, 19:35 UTC5h 5m
2026-07-21 UAL1947 LGA → IAH Jul 21, 02:05 UTCJul 21, 02:20 UTC15m
2026-07-21 UAL1947 LGA → IAH Jul 21, 02:08 UTCJul 21, 06:44 UTC4h 36m
2026-07-21 UAL1260 SNA → SFO Jul 21, 00:00 UTCJul 21, 00:25 UTC25m
2026-07-20 UAL1260 SNA → SFO Jul 20, 19:15 UTCJul 20, 19:50 UTC35m
2026-07-20 UAL2855 MCO → SFO Jul 20, 12:55 UTCJul 20, 17:45 UTC4h 50m
2026-07-20 UAL1730 - Jul 20, 06:55 UTCJul 20, 11:25 UTC4h 30m
2026-07-19 UAL639 DEN → MSO Jul 19, 22:55 UTCJul 20, 04:05 UTC5h 10m
2026-07-19 UAL1783 - Jul 19, 15:55 UTCJul 19, 21:00 UTC5h 5m
2026-07-19 UAL1756 - Jul 19, 13:35 UTCJul 19, 14:15 UTC40m
2026-07-18 UAL502 IAH → DCA Jul 18, 23:25 UTCJul 19, 00:00 UTC35m
2026-07-18 UAL2460 SAT → IAH Jul 18, 17:55 UTCJul 18, 20:45 UTC2h 50m
2026-07-18 UAL654 - Jul 18, 13:05 UTCJul 18, 16:05 UTC3h 0m
2026-07-18 UAL8200 - Jul 18, 05:15 UTCJul 18, 08:00 UTC2h 45m
2026-07-18 UAL8200 IAH → LAX Jul 18, 05:18 UTCJul 18, 07:52 UTC2h 34m
2026-07-17 UAL1216 - Jul 17, 22:55 UTCJul 18, 00:55 UTC2h 0m
2026-07-17 UAL410 - Jul 17, 17:50 UTCJul 17, 20:40 UTC2h 50m
2026-07-17 UAL2484 - Jul 17, 12:55 UTCJul 17, 14:50 UTC1h 55m
2026-07-17 UAL432 - Jul 17, 01:39 UTCJul 17, 03:25 UTC1h 45m
2026-07-17 UAL432 IAH → SAP Jul 17, 01:37 UTCJul 17, 03:53 UTC2h 16m
2026-07-16 UAL2492 - Jul 16, 19:50 UTCJul 16, 22:45 UTC2h 55m
2026-07-16 UAL723 - Jul 16, 14:40 UTCJul 16, 17:45 UTC3h 5m
2026-07-16 UAL1044 - Jul 16, 10:20 UTCJul 16, 12:20 UTC2h 0m
2026-07-16 UAL2305 - Jul 16, 00:10 UTCJul 16, 03:40 UTC3h 30m
2026-07-15 UAL1754 MFR → SFO Jul 15, 21:50 UTCJul 15, 22:55 UTC1h 5m
2026-07-15 UAL337 DEN → MFR Jul 15, 18:25 UTCJul 15, 20:30 UTC2h 5m
2026-07-15 UAL2052 - Jul 15, 11:50 UTCJul 15, 15:20 UTC3h 30m
2026-07-15 UAL2254 DEN → BDL Jul 15, 00:40 UTCJul 15, 03:55 UTC3h 15m
2026-07-14 UAL395 IAD → DEN Jul 14, 20:20 UTCJul 14, 23:10 UTC2h 49m
2026-07-14 UAL1421 - Jul 14, 16:30 UTCJul 14, 18:40 UTC2h 10m
2026-07-14 UAL1825 IAD → FLL Jul 14, 12:35 UTCJul 14, 14:50 UTC2h 15m
2026-07-14 UAL1825 IAD → FLL Jul 14, 12:38 UTCJul 14, 14:42 UTC2h 4m
2026-07-14 UAL1252 CLE → IAD Jul 14, 10:05 UTCJul 14, 11:00 UTC55m
2026-07-14 UAL2131 IAD → CLE Jul 14, 02:25 UTCJul 14, 03:10 UTC45m

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 N17413 page for operator, model, and routing details .

Mode-S A12AA0 frequently asked

What is Mode-S code A12AA0?
A12AA0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17413.
Where is Mode-S A12AA0 registered?
Mode-S code A12AA0 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 A12AA0 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 04:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12AA0, octal 50225240, decimal 10,562,208.
What flights does A12AA0 operate?
Mode-S A12AA0 has broadcast 20 distinct callsigns, including UAL1031, UAL1250, UAL2372, UAL1674, UAL1039.