Apparatus

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sensors Mode-S transponder

AC42BF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8898L · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC42BF
Octal
53041277
Decimal
11,289,279
Country
US
Tail
N8898L
Type
B38M
Broadcasting now · callsign SWA1982 · 33,000 ft
Flights observed
619
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

AC42BF is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC42BF 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
SWA745 - 5 2026-07-11
SWA714 Southwest Airlines 5 2026-05-13
SWA2863 Southwest Airlines 5 2026-05-02
SWA2618 Southwest Airlines 5 2026-04-17
SWA998 Southwest Airlines 4 2026-05-13
SWA4124 Southwest Airlines 4 2026-05-21
SWA409 - 4 2026-06-25
SWA2754 Southwest Airlines 4 2026-04-18
SWA2576 - 4 2026-04-13
SWA2536 Southwest Airlines 4 2026-06-03
SWA2391 - 4 2026-07-09
SWA2328 - 4 2026-06-17
SWA1975 - 4 2026-07-01
SWA937 - 3 2026-07-02
SWA8506 Southwest Airlines 3 2026-06-09
SWA4930 Southwest Airlines 3 2026-06-16
SWA4570 Southwest Airlines 3 2026-06-17
SWA4450 - 3 2026-06-26
SWA4175 - 3 2026-06-30
SWA4172 Southwest Airlines 3 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA347 - Jul 14, 13:45 UTCJul 14, 16:45 UTC3h 0m
2026-07-14 SWA347 MSY → MDW Jul 14, 10:15 UTCJul 14, 12:10 UTC1h 55m
2026-07-14 SWA3964 STL → MSY Jul 14, 03:50 UTCJul 14, 05:10 UTC1h 20m
2026-07-14 SWA3457 - Jul 14, 01:25 UTCJul 14, 03:05 UTC1h 40m
2026-07-14 SWA3457 RDU → STL Jul 14, 01:22 UTCJul 14, 03:06 UTC1h 44m
2026-07-13 SWA1389 - Jul 13, 22:15 UTCJul 14, 00:40 UTC2h 25m
2026-07-13 SWA4819 - Jul 13, 17:30 UTCJul 13, 20:40 UTC3h 10m
2026-07-13 SWA4785 - Jul 13, 14:10 UTCJul 13, 16:10 UTC2h 0m
2026-07-13 SWA4785 BWI → FLL Jul 13, 14:07 UTCJul 13, 16:09 UTC2h 3m
2026-07-13 SWA2985 - Jul 13, 10:55 UTCJul 13, 13:05 UTC2h 10m
2026-07-13 SWA2985 MSY → BWI Jul 13, 10:54 UTCJul 13, 13:03 UTC2h 10m
2026-07-13 SWA1065 - Jul 13, 03:20 UTCJul 13, 04:30 UTC1h 10m
2026-07-12 SWA1269 - Jul 12, 22:15 UTCJul 13, 02:20 UTC4h 5m
2026-07-12 SWA1269 CHS → DAL Jul 12, 22:11 UTCJul 13, 02:13 UTC4h 2m
2026-07-12 SWA3436 DAL → CHS Jul 12, 18:26 UTCJul 12, 20:44 UTC2h 18m
2026-07-12 SWA3436 - Jul 12, 18:30 UTCJul 12, 20:45 UTC2h 15m
2026-07-12 SWA3436 - Jul 12, 15:50 UTCJul 12, 17:05 UTC1h 15m
2026-07-12 SWA2060 - Jul 12, 13:05 UTCJul 12, 14:50 UTC1h 45m
2026-07-12 SWA2322 - Jul 12, 10:40 UTCJul 12, 11:55 UTC1h 15m
2026-07-12 SWA4390 - Jul 12, 01:55 UTCJul 12, 03:15 UTC1h 20m
2026-07-12 SWA4390 DAL → BHM Jul 12, 01:55 UTCJul 12, 03:16 UTC1h 21m
2026-07-11 SWA1859 SFO → DAL Jul 11, 21:50 UTCJul 12, 00:50 UTC3h 0m
2026-07-11 SWA2886 - Jul 11, 16:10 UTCJul 11, 20:05 UTC3h 55m
2026-07-11 SWA2886 MDW → SFO Jul 11, 16:07 UTCJul 11, 20:09 UTC4h 3m
2026-07-11 SWA745 BOS → MDW Jul 11, 12:15 UTCJul 11, 14:25 UTC2h 10m
2026-07-11 SWA232 - Jul 11, 06:50 UTCJul 11, 08:25 UTC1h 35m
2026-07-11 SWA232 ATL → MDW Jul 11, 02:50 UTCJul 11, 04:15 UTC1h 25m
2026-07-11 SWA4922 - Jul 11, 00:05 UTCJul 11, 01:15 UTC1h 10m
2026-07-10 SWA293 - Jul 10, 18:00 UTCJul 10, 18:50 UTC50m
2026-07-10 SWA292 - Jul 10, 14:20 UTCJul 10, 15:00 UTC40m
2026-07-10 SWA292 MCO → MBJ Jul 10, 14:15 UTCJul 10, 15:51 UTC1h 36m
2026-07-10 SWA2815 MDW → MCO Jul 10, 10:25 UTCJul 10, 12:40 UTC2h 15m
2026-07-10 SWA3766 RDU → MDW Jul 10, 05:55 UTCJul 10, 07:25 UTC1h 30m
2026-07-10 SWA161 BWI → RDU Jul 10, 03:50 UTCJul 10, 04:40 UTC50m
2026-07-10 SWA2963 MSP → BWI Jul 10, 00:25 UTCJul 10, 02:20 UTC1h 55m
2026-07-10 SWA2963 MSP → BWI Jul 10, 00:21 UTCJul 10, 02:19 UTC1h 58m
2026-07-09 SWA1638 DEN → MSP Jul 9, 21:08 UTCJul 9, 22:42 UTC1h 35m
2026-07-09 SWA1638 DEN → MSP Jul 9, 21:10 UTCJul 9, 22:40 UTC1h 30m
2026-07-09 SWA2391 - Jul 9, 17:45 UTCJul 9, 19:50 UTC2h 5m
2026-07-09 SWA2391 LAX → DEN Jul 9, 17:41 UTCJul 9, 19:45 UTC2h 4m
2026-07-09 SWA1568 DEN → LAX Jul 9, 14:25 UTCJul 9, 16:25 UTC2h 0m
2026-07-09 SWA282 - Jul 9, 11:00 UTCJul 9, 12:50 UTC1h 50m
2026-07-09 SWA4011 RHV → AUS Jul 9, 01:20 UTCJul 9, 04:15 UTC2h 55m
2026-07-09 SWA4011 SJC → AUS Jul 9, 01:16 UTCJul 9, 04:10 UTC2h 54m
2026-07-08 SWA399 AUS → SJC Jul 8, 21:15 UTCJul 9, 00:20 UTC3h 5m
2026-07-08 SWA2834 - Jul 8, 17:30 UTCJul 8, 19:40 UTC2h 10m
2026-07-08 SWA2588 - Jul 8, 14:15 UTCJul 8, 16:10 UTC1h 55m
2026-07-08 SWA1296 - Jul 8, 11:15 UTCJul 8, 12:45 UTC1h 30m
2026-07-08 SWA1255 AUS → DAL Jul 8, 02:40 UTCJul 8, 03:20 UTC40m
2026-07-07 SWA3125 PHX → AUS Jul 7, 23:35 UTCJul 8, 01:25 UTC1h 50m

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 N8898L page for operator, model, and routing details .

Mode-S AC42BF frequently asked

What is Mode-S code AC42BF?
AC42BF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8898L.
Where is Mode-S AC42BF registered?
Mode-S code AC42BF 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 AC42BF broadcasting right now?
Yes. Mode-S AC42BF is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC42BF, octal 53041277, decimal 11,289,279.
What flights does AC42BF operate?
Mode-S AC42BF has broadcast 20 distinct callsigns, including SWA745, SWA714, SWA2863, SWA2618, SWA998.