Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A18B71

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N199UW · AIRBUS A-321 · operated by AMERICAN AIRLINES INC

Hex
A18B71
Octal
50305561
Decimal
10,586,993
Country
US
Tail
N199UW
Type
A321
No current signal · last broadcast 4h ago
Flights observed
485
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A18B71.

Country allocation

The ICAO 24-bit address A18B71 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
AAL3001 - 9 2026-06-30
AAL1999 - 8 2026-06-19
AAL3064 American Airlines 6 2026-07-03
AAL2279 American Airlines 5 2026-06-11
AAL1483 American Airlines 5 2026-04-27
AAL573 American Airlines 4 2026-05-21
AAL461 American Airlines 4 2026-05-22
AAL3139 American Airlines 4 2026-06-10
AAL2890 American Airlines 4 2026-05-16
AAL2826 - 4 2026-07-03
AAL2602 - 4 2026-07-03
AAL2582 American Airlines 4 2026-04-27
AAL2482 American Airlines 4 2026-05-30
AAL2466 - 4 2026-07-10
AAL2411 American Airlines 4 2026-05-14
AAL2369 American Airlines 4 2026-04-17
AAL1896 American Airlines 4 2026-06-09
AAL1467 American Airlines 4 2026-04-22
AAL1090 American Airlines 4 2026-05-27
AAL767 - 3 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAL2364 - Jul 14, 00:40 UTCJul 14, 04:10 UTC3h 30m
2026-07-13 AAL1050 - Jul 13, 19:10 UTCJul 13, 22:55 UTC3h 45m
2026-07-13 AAL3237 - Jul 13, 12:40 UTCJul 13, 16:20 UTC3h 40m
2026-07-13 AAL2149 - Jul 13, 07:40 UTCJul 13, 11:25 UTC3h 45m
2026-07-13 AAL3204 - Jul 13, 04:00 UTCJul 13, 04:55 UTC55m
2026-07-12 AAL3033 - Jul 12, 22:15 UTCJul 13, 02:10 UTC3h 55m
2026-07-12 AAL2396 - Jul 12, 16:25 UTCJul 12, 21:00 UTC4h 35m
2026-07-12 AAL1154 - Jul 12, 12:35 UTCJul 12, 15:05 UTC2h 30m
2026-07-12 AAL2283 - Jul 12, 06:45 UTCJul 12, 10:01 UTC3h 15m
2026-07-12 AAL2283 DFW → PDX Jul 12, 02:01 UTCJul 12, 05:25 UTC3h 25m
2026-07-11 AAL1288 MCO → DFW Jul 11, 22:15 UTCJul 12, 00:45 UTC2h 30m
2026-07-11 AAL1288 - Jul 11, 18:30 UTCJul 11, 20:55 UTC2h 25m
2026-07-11 AAL2746 - Jul 11, 14:25 UTCJul 11, 17:10 UTC2h 45m
2026-07-10 AAL1569 - Jul 10, 23:10 UTCJul 11, 03:55 UTC4h 45m
2026-07-10 AAL543 - Jul 10, 16:50 UTCJul 10, 20:45 UTC3h 55m
2026-07-10 AAL2466 - Jul 10, 02:55 UTCJul 10, 03:50 UTC55m
2026-07-10 AAL2466 - Jul 10, 01:05 UTCJul 10, 01:50 UTC45m
2026-07-09 AAL1155 DFW → PHX Jul 9, 22:00 UTCJul 9, 23:55 UTC1h 55m
2026-07-09 AAL1155 DFW → PHX Jul 9, 21:56 UTCJul 9, 23:56 UTC2h 0m
2026-07-09 AAL1583 CMH → DFW Jul 9, 16:56 UTCJul 9, 20:30 UTC3h 34m
2026-07-09 AAL1583 CMH → DFW Jul 9, 17:00 UTCJul 9, 20:35 UTC3h 35m
2026-07-09 AAL1583 CMH → DFW Jul 9, 12:05 UTCJul 9, 15:20 UTC3h 15m
2026-07-09 AAL2343 - Jul 9, 05:45 UTCJul 9, 05:50 UTC5m
2026-07-09 AAL2343 - Jul 9, 03:20 UTCJul 9, 05:50 UTC2h 30m
2026-07-09 AAL2343 MIA → DFW Jul 9, 03:19 UTCJul 9, 05:27 UTC2h 8m
2026-07-08 AAL1174 - Jul 8, 23:25 UTCJul 9, 01:50 UTC2h 25m
2026-07-08 AAL642 - Jul 8, 18:10 UTCJul 8, 20:35 UTC2h 25m
2026-07-08 AAL642 MIA → JFK Jul 8, 18:09 UTCJul 8, 20:28 UTC2h 19m
2026-07-08 AAL1250 PHL → PBI Jul 8, 14:10 UTCJul 8, 16:50 UTC2h 40m
2026-07-08 AAL938 MCO → ORD Jul 8, 10:35 UTCJul 8, 12:50 UTC2h 15m
2026-07-08 AAL938 MCO → ORD Jul 8, 10:32 UTCJul 8, 12:51 UTC2h 19m
2026-07-07 AAL2791 DFW → MCO Jul 7, 23:10 UTCJul 8, 00:15 UTC1h 5m
2026-07-07 AAL2791 DFW → MCO Jul 7, 23:06 UTCJul 8, 01:26 UTC2h 20m
2026-07-07 AAL1828 - Jul 7, 18:50 UTCJul 7, 21:50 UTC3h 0m
2026-07-07 AAL1828 - Jul 7, 14:15 UTCJul 7, 16:55 UTC2h 40m
2026-07-07 AAL2677 MCO → DFW Jul 7, 10:05 UTCJul 7, 12:20 UTC2h 15m
2026-07-06 AAL486 ORD → MCO Jul 6, 22:55 UTCJul 7, 01:05 UTC2h 10m
2026-07-06 AAL486 ORD → MCO Jul 6, 22:51 UTCJul 7, 01:03 UTC2h 12m
2026-07-06 AAL2988 DFW → ORD Jul 6, 19:25 UTCJul 6, 21:20 UTC1h 55m
2026-07-06 AAL1285 - Jul 6, 15:50 UTCJul 6, 18:00 UTC2h 10m
2026-07-06 AAL609 - Jul 6, 13:10 UTCJul 6, 14:30 UTC1h 20m
2026-07-06 AAL3200 - Jul 6, 00:40 UTCJul 6, 01:45 UTC1h 5m
2026-07-05 AAL2784 - Jul 5, 21:45 UTCJul 5, 23:05 UTC1h 20m
2026-07-05 AAL2772 - Jul 5, 17:00 UTCJul 5, 20:35 UTC3h 35m
2026-07-05 AAL1867 SMF → PHX Jul 5, 13:15 UTCJul 5, 14:45 UTC1h 30m
2026-07-04 AAL2634 DFW → SMF Jul 4, 17:40 UTCJul 4, 20:40 UTC3h 0m
2026-07-04 AAL2634 DFW → SMF Jul 4, 17:37 UTCJul 4, 20:38 UTC3h 1m
2026-07-04 AAL1692 PHL → DFW Jul 4, 12:25 UTCJul 4, 15:15 UTC2h 50m
2026-07-04 AAL2285 PDX → PHL Jul 4, 05:40 UTCJul 4, 10:20 UTC4h 40m
2026-07-03 AAL3064 CLT → PDX Jul 3, 23:30 UTCJul 4, 04:25 UTC4h 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 N199UW page for operator, model, and routing details .

Mode-S A18B71 frequently asked

What is Mode-S code A18B71?
A18B71 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N199UW.
Where is Mode-S A18B71 registered?
Mode-S code A18B71 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 A18B71 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A18B71, octal 50305561, decimal 10,586,993.
What flights does A18B71 operate?
Mode-S A18B71 has broadcast 20 distinct callsigns, including AAL3001, AAL1999, AAL3064, AAL2279, AAL1483.