Apparatus

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sensors Mode-S transponder

ABEF16

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8681M · BOEING 737-800 · operated by SOUTHWEST AIRLINES CO

Hex
ABEF16
Octal
52767426
Decimal
11,267,862
Country
US
Tail
N8681M
Type
B738
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
753
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S ABEF16.

Country allocation

The ICAO 24-bit address ABEF16 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
SWA963 - 5 2026-07-07
SWA3525 - 5 2026-07-15
SWA2786 - 5 2026-06-30
SWA2606 Southwest Airlines 5 2026-04-21
SWA958 - 4 2026-06-30
SWA931 Southwest Airlines 4 2026-06-07
SWA581 Southwest Airlines 4 2026-07-26
SWA438 Southwest Airlines 4 2026-05-25
SWA3201 Southwest Airlines 4 2026-05-05
SWA2489 Southwest Airlines 4 2026-05-25
SWA2224 Southwest Airlines 4 2026-04-23
SWA1938 Southwest Airlines 4 2026-04-16
SWA1893 - 4 2026-07-10
SWA1882 - 4 2026-06-11
SWA133 Southwest Airlines 4 2026-04-18
SWA1231 Southwest Airlines 4 2026-07-23
SWA1123 - 4 2026-06-27
SWA1010 - 4 2026-06-16
SWA462 - 3 2026-06-24
SWA45 - 3 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2925 SEA → OAK Jul 26, 20:45 UTCJul 26, 21:30 UTC45m
2026-07-26 SWA581 SNA → OAK Jul 26, 16:55 UTCJul 26, 18:55 UTC2h 0m
2026-07-26 SWA581 SNA → OAK Jul 26, 16:53 UTCJul 26, 18:51 UTC1h 58m
2026-07-26 SWA4002 CMH → LAS Jul 26, 14:10 UTCJul 26, 15:45 UTC1h 35m
2026-07-26 SWA4710 MHT → MCO Jul 26, 10:45 UTCJul 26, 12:50 UTC2h 5m
2026-07-26 SWA3957 DEN → BNA Jul 26, 02:10 UTCJul 26, 02:55 UTC45m
2026-07-25 SWA2921 BWI → BOS Jul 25, 23:55 UTCJul 26, 01:15 UTC1h 20m
2026-07-25 SWA3282 DAL → COS Jul 25, 16:05 UTCJul 25, 22:50 UTC6h 45m
2026-07-25 SWA107 SJC → SAN Jul 25, 04:55 UTCJul 25, 05:30 UTC35m
2026-07-25 SWA107 SJC → SAN Jul 25, 04:50 UTCJul 25, 06:50 UTC2h 0m
2026-07-25 SWA107 SJC → SAN Jul 25, 02:30 UTCJul 25, 03:55 UTC1h 25m
2026-07-24 SWA4881 PHL → MDW Jul 24, 21:20 UTCJul 24, 22:50 UTC1h 30m
2026-07-24 SWA2109 MDW → MIA Jul 24, 17:55 UTCJul 24, 20:05 UTC2h 10m
2026-07-24 SWA3877 SJC → PDX Jul 24, 16:20 UTCJul 24, 16:50 UTC30m
2026-07-24 SWA3877 SJC → PDX Jul 24, 16:15 UTCJul 24, 16:48 UTC33m
2026-07-24 SWA745 SJC → SEA Jul 24, 12:25 UTCJul 24, 14:35 UTC2h 10m
2026-07-24 SWA1494 SNA → OAK Jul 24, 02:20 UTCJul 24, 05:30 UTC3h 10m
2026-07-24 SWA1494 SNA → OAK Jul 24, 02:15 UTCJul 24, 05:32 UTC3h 17m
2026-07-23 SWA2392 BWI → RDU Jul 23, 23:15 UTCJul 24, 01:05 UTC1h 50m
2026-07-23 SWA404 DCA → OKC Jul 23, 19:20 UTCJul 23, 21:45 UTC2h 25m
2026-07-23 SWA3149 AUS → OAK Jul 23, 16:25 UTCJul 23, 18:10 UTC1h 45m
2026-07-23 SWA3195 ONT → OAK Jul 23, 13:05 UTCJul 23, 15:10 UTC2h 5m
2026-07-23 SWA4770 TPA → CMH Jul 23, 05:10 UTCJul 23, 07:20 UTC2h 10m
2026-07-23 SWA1231 SFO → BUR Jul 23, 02:25 UTCJul 23, 03:45 UTC1h 20m
2026-07-22 SWA4385 SAN → SFO Jul 22, 23:40 UTCJul 23, 01:30 UTC1h 50m
2026-07-22 SWA4385 SAN → SFO Jul 22, 23:35 UTCJul 23, 01:35 UTC2h 0m
2026-07-22 SWA469 SMF → LAX Jul 22, 20:45 UTCJul 22, 22:15 UTC1h 30m
2026-07-22 SWA2258 AUS → SAN Jul 22, 16:56 UTCJul 22, 19:21 UTC2h 25m
2026-07-22 SWA2258 AUS → SAN Jul 22, 17:00 UTCJul 22, 19:25 UTC2h 25m
2026-07-22 SWA3738 LAX → OAK Jul 22, 14:07 UTCJul 22, 15:06 UTC1h 0m
2026-07-22 SWA3738 LAX → OAK Jul 22, 14:10 UTCJul 22, 15:10 UTC1h 0m
2026-07-22 SWA2646 - Jul 22, 03:55 UTCJul 22, 05:00 UTC1h 5m
2026-07-22 SWA2646 DEN → SLC Jul 22, 03:53 UTCJul 22, 04:58 UTC1h 5m
2026-07-21 SWA888 ATL → MSY Jul 21, 22:45 UTCJul 22, 02:45 UTC4h 0m
2026-07-21 SWA2641 SFO → LAX Jul 21, 19:00 UTCJul 21, 20:40 UTC1h 40m
2026-07-21 SWA2641 SFO → LAX Jul 21, 18:59 UTCJul 21, 20:39 UTC1h 41m
2026-07-21 SWA3449 - Jul 21, 13:25 UTCJul 21, 16:40 UTC3h 15m
2026-07-21 SWA1696 BWI → BOS Jul 21, 05:50 UTCJul 21, 07:40 UTC1h 50m
2026-07-21 SWA4151 MCO → BWI Jul 21, 02:45 UTCJul 21, 04:40 UTC1h 55m
2026-07-21 SWA3620 BWI → BOS Jul 21, 00:40 UTCJul 21, 01:25 UTC45m
2026-07-20 SWA3620 BWI → BOS Jul 20, 20:15 UTCJul 20, 22:25 UTC2h 10m
2026-07-20 SWA3051 DEN → SEA Jul 20, 16:25 UTCJul 20, 18:40 UTC2h 15m
2026-07-20 SWA2574 LAS → ONT Jul 20, 13:25 UTCJul 20, 15:05 UTC1h 40m
2026-07-20 SWA4515 - Jul 20, 06:25 UTCJul 20, 08:00 UTC1h 35m
2026-07-20 SWA379 DAL → STL Jul 20, 04:00 UTCJul 20, 05:20 UTC1h 20m
2026-07-20 SWA379 DAL → STL Jul 20, 03:58 UTCJul 20, 05:17 UTC1h 19m
2026-07-19 SWA3736 PHX → SJC Jul 19, 22:45 UTCJul 20, 01:25 UTC2h 40m
2026-07-19 SWA233 PWM → BWI Jul 19, 17:30 UTCJul 19, 21:25 UTC3h 55m
2026-07-19 SWA233 PWM → BWI Jul 19, 15:10 UTCJul 19, 16:00 UTC50m
2026-07-19 SWA4088 - Jul 19, 13:10 UTCJul 19, 14:00 UTC50m

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 N8681M page for operator, model, and routing details .

Mode-S ABEF16 frequently asked

What is Mode-S code ABEF16?
ABEF16 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8681M.
Where is Mode-S ABEF16 registered?
Mode-S code ABEF16 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 ABEF16 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABEF16, octal 52767426, decimal 11,267,862.
What flights does ABEF16 operate?
Mode-S ABEF16 has broadcast 20 distinct callsigns, including SWA963, SWA3525, SWA2786, SWA2606, SWA958.