Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ABDD91

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8639B · BOEING 737-800 · operated by SOUTHWEST AIRLINES CO

Hex
ABDD91
Octal
52756621
Decimal
11,263,377
Country
US
Tail
N8639B
Type
B738
Broadcasting now · callsign SWA2204 · 23,150 ft
Flights observed
110
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

ABDD91 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address ABDD91 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
SWA3430 Southwest Airlines 3 2026-05-26
SWA1031 Southwest Airlines 3 2026-05-15
SWA4605 Southwest Airlines 2 2026-05-24
SWA441 Southwest Airlines 2 2026-05-25
SWA4113 Southwest Airlines 2 2026-05-15
SWA3810 Southwest Airlines 2 2026-05-18
SWA3580 Southwest Airlines 2 2026-05-13
SWA3481 Southwest Airlines 2 2026-05-23
SWA3459 Southwest Airlines 2 2026-05-21
SWA3396 Southwest Airlines 2 2026-05-18
SWA3393 Southwest Airlines 2 2026-05-20
SWA3261 Southwest Airlines 2 2026-05-29
SWA3201 Southwest Airlines 2 2026-05-29
SWA2904 Southwest Airlines 2 2026-05-19
SWA2901 Southwest Airlines 2 2026-05-22
SWA2744 Southwest Airlines 2 2026-05-14
SWA2361 Southwest Airlines 2 2026-05-20
SWA2300 Southwest Airlines 2 2026-05-25
SWA2137 Southwest Airlines 2 2026-05-23
SWA2104 Southwest Airlines 2 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 SWA1643 STL → DCA May 29, 22:10 UTCMay 29, 23:05 UTC55m
2026-05-29 SWA1643 STL → DCA May 29, 20:25 UTCMay 29, 20:40 UTC15m
2026-05-29 SWA3201 OMA → MDW May 29, 18:30 UTCMay 29, 18:50 UTC20m
2026-05-29 SWA3201 OMA → MDW May 29, 16:25 UTCMay 29, 17:00 UTC35m
2026-05-29 SWA3306 BWI → MSY May 29, 12:55 UTCMay 29, 15:00 UTC2h 5m
2026-05-29 SWA4198 SJC → SNA May 29, 07:10 UTCMay 29, 11:00 UTC3h 50m
2026-05-29 SWA1910 SJC → LAS May 29, 03:50 UTCMay 29, 05:40 UTC1h 50m
2026-05-29 SWA3261 DAL → ORD May 29, 01:25 UTCMay 29, 02:55 UTC1h 30m
2026-05-28 SWA3261 DAL → ORD May 28, 22:10 UTCMay 29, 00:25 UTC2h 15m
2026-05-28 SWA2838 SEA → SJC May 28, 18:15 UTCMay 28, 20:50 UTC2h 35m
2026-05-28 SWA2090 BNA → DAL May 28, 12:55 UTCMay 28, 16:40 UTC3h 45m
2026-05-28 SWA2688 OAK → PSP May 28, 10:00 UTCMay 28, 11:15 UTC1h 15m
2026-05-28 SWA2651 BUR → OAK May 28, 00:00 UTCMay 28, 01:25 UTC1h 25m
2026-05-27 SWA5048 TPA → BWI May 27, 20:25 UTCMay 27, 22:20 UTC1h 55m
2026-05-27 SWA5049 LAS → SLC May 27, 17:40 UTCMay 27, 19:30 UTC1h 50m
2026-05-27 SWA8501 PAE → OAK May 27, 16:25 UTCMay 27, 16:50 UTC25m
2026-05-27 SWA2104 STL → LGA May 27, 12:15 UTCMay 27, 15:25 UTC3h 10m
2026-05-27 SWA2104 STL → LGA May 27, 12:05 UTCMay 27, 12:10 UTC5m
2026-05-27 SWA4429 DAL → LBB May 27, 03:24 UTCMay 27, 05:09 UTC1h 45m
2026-05-27 SWA585 SAN → SFO May 27, 00:39 UTCMay 27, 02:24 UTC1h 45m
2026-05-26 SWA1530 SRQ → DAL May 26, 22:09 UTCMay 26, 23:29 UTC1h 20m
2026-05-26 SWA3430 STL → ATL May 26, 20:15 UTCMay 26, 20:50 UTC35m
2026-05-26 SWA3430 STL → ATL May 26, 18:15 UTCMay 26, 19:57 UTC1h 42m
2026-05-26 SWA3430 STL → ATL May 26, 18:19 UTCMay 26, 20:50 UTC2h 30m
2026-05-26 SWA3545 LAS → SJC May 26, 15:09 UTCMay 26, 16:59 UTC1h 50m
2026-05-26 SWA2112 SJC → SAN May 26, 11:20 UTCMay 26, 13:54 UTC2h 35m
2026-05-25 SWA2570 SLC → OAK May 25, 23:49 UTCMay 26, 03:00 UTC3h 10m
2026-05-25 SWA550 MDW → RDU May 25, 21:24 UTCMay 25, 22:44 UTC1h 20m
2026-05-25 SWA499 SAN → OAK May 25, 18:40 UTCMay 25, 20:09 UTC1h 29m
2026-05-25 SWA441 HOU → DEN May 25, 15:15 UTCMay 25, 17:25 UTC2h 10m
2026-05-25 SWA441 HOU → DEN May 25, 15:11 UTCMay 25, 17:18 UTC2h 7m
2026-05-25 SWA2300 PHX → SFO May 25, 13:10 UTCMay 25, 14:15 UTC1h 5m
2026-05-25 SWA2300 PHX → SFO May 25, 13:08 UTCMay 25, 14:11 UTC1h 3m
2026-05-25 SWA3158 SJC → SNA May 25, 03:50 UTCMay 25, 04:40 UTC50m
2026-05-25 SWA4172 SLC → LAX May 25, 01:55 UTCMay 25, 02:40 UTC45m
2026-05-24 SWA1555 SEA → OAK May 24, 23:00 UTCMay 24, 23:30 UTC30m
2026-05-24 SWA1555 SEA → OAK May 24, 21:40 UTCMay 24, 23:19 UTC1h 39m
2026-05-24 SWA1516 MEM → DAL May 24, 18:45 UTCMay 24, 20:20 UTC1h 35m
2026-05-24 SWA1516 MEM → DAL May 24, 16:50 UTCMay 24, 17:30 UTC40m
2026-05-24 SWA4142 FLL → SAT May 24, 13:40 UTCMay 24, 15:20 UTC1h 40m
2026-05-24 SWA4605 STL → LAX May 24, 02:40 UTCMay 24, 04:40 UTC2h 0m
2026-05-24 SWA4605 STL → LAX May 24, 00:45 UTCMay 24, 01:35 UTC50m
2026-05-23 SWA1921 SAN → LAS May 23, 21:50 UTCMay 23, 23:50 UTC2h 0m
2026-05-23 SWA2137 MDW → PHL May 23, 17:50 UTCMay 23, 20:25 UTC2h 35m
2026-05-23 SWA2137 MDW → PHL May 23, 15:20 UTCMay 23, 16:40 UTC1h 20m
2026-05-23 SWA3481 MDW → DEN May 23, 11:15 UTCMay 23, 13:30 UTC2h 15m
2026-05-23 SWA3481 MDW → DEN May 23, 11:13 UTCMay 23, 13:19 UTC2h 7m
2026-05-23 SWA997 SJC → SAN May 23, 03:25 UTCMay 23, 06:25 UTC3h 0m
2026-05-23 SWA2668 LAS → SJC May 23, 00:50 UTCMay 23, 01:55 UTC1h 5m
2026-05-22 SWA2901 RDU → TPA May 22, 22:40 UTCMay 22, 23:45 UTC1h 5m

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 N8639B page for operator, model, and routing details .

Mode-S ABDD91 frequently asked

What is Mode-S code ABDD91?
ABDD91 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8639B.
Where is Mode-S ABDD91 registered?
Mode-S code ABDD91 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 ABDD91 broadcasting right now?
Yes. Mode-S ABDD91 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABDD91, octal 52756621, decimal 11,263,377.
What flights does ABDD91 operate?
Mode-S ABDD91 has broadcast 20 distinct callsigns, including SWA3430, SWA1031, SWA4605, SWA441, SWA4113.