sensors Mode-S transponder

AC47DE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8901Q · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC47DE
Octal
53043736
Decimal
11,290,590
Country
US
Tail
N8901Q
Type
B38M
No current signal · last broadcast 20h ago
Flights observed
16
Distinct callsigns
9
Country
US
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S AC47DE.

Country allocation

The ICAO 24-bit address AC47DE 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 9 distinct

Callsign Airline Flights Last seen
SWA3181 - 3 2026-04-13
SWA1704 - 3 2026-04-13
SWA1526 - 3 2026-04-13
SWA2686 - 2 2026-04-13
SWA3201 - 1 2026-04-12
SWA2701 - 1 2026-04-12
SWA269 Southwest Airlines 1 2026-04-14
SWA1643 - 1 2026-04-13
SWA1640 Southwest Airlines 1 2026-04-13

Recent flights last 16

DateFlightRouteTakeoffLandingDuration
2026-04-14 SWA269 MCI → DEN Apr 14, 10:40 UTCApr 14, 11:05 UTC25m
2026-04-13 SWA1640 BWI → RDU Apr 13, 23:33 UTCApr 14, 01:05 UTC1h 32m
2026-04-13 SWA2686 - Apr 13, 20:50 UTCApr 13, 22:17 UTC1h 27m
2026-04-13 SWA2686 - Apr 13, 17:34 UTCApr 13, 20:00 UTC2h 26m
2026-04-13 SWA1526 - Apr 13, 16:15 UTCApr 13, 16:35 UTC20m
2026-04-13 SWA1526 - Apr 13, 15:50 UTCApr 13, 16:35 UTC45m
2026-04-13 SWA1526 - Apr 13, 14:55 UTCApr 13, 16:30 UTC1h 35m
2026-04-13 SWA1704 - Apr 13, 12:20 UTCApr 13, 13:35 UTC1h 15m
2026-04-13 SWA1704 - Apr 13, 11:55 UTCApr 13, 13:35 UTC1h 40m
2026-04-13 SWA1704 - Apr 13, 10:25 UTCApr 13, 12:15 UTC1h 50m
2026-04-13 SWA3181 - Apr 13, 04:20 UTCApr 13, 04:40 UTC20m
2026-04-13 SWA3181 - Apr 13, 03:55 UTCApr 13, 04:40 UTC45m
2026-04-13 SWA3181 - Apr 13, 02:10 UTCApr 13, 04:14 UTC2h 4m
2026-04-13 SWA1643 - Apr 13, 00:20 UTCApr 13, 01:15 UTC55m
2026-04-12 SWA3201 - Apr 12, 18:35 UTCApr 12, 20:54 UTC2h 19m
2026-04-12 SWA2701 - Apr 12, 17:15 UTCApr 12, 17:20 UTC5m

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 N8901Q page for operator, model, and routing details .

Mode-S AC47DE frequently asked

What is Mode-S code AC47DE?
AC47DE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8901Q.
Where is Mode-S AC47DE registered?
Mode-S code AC47DE 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 AC47DE broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC47DE, octal 53043736, decimal 11,290,590.
What flights does AC47DE operate?
Mode-S AC47DE has broadcast 9 distinct callsigns, including SWA3181, SWA1704, SWA1526, SWA2686, SWA3201.