Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ABBD73

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8558Z · BOEING 737-800 · operated by SOUTHWEST AIRLINES CO

Hex
ABBD73
Octal
52736563
Decimal
11,255,155
Country
US
Tail
N8558Z
Type
B738
No current signal · last broadcast 4h ago
Flights observed
614
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S ABBD73.

Country allocation

The ICAO 24-bit address ABBD73 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
SWA4685 - 6 2026-07-10
SWA4020 Southwest Airlines 6 2026-04-17
SWA1263 - 6 2026-07-09
SWA3141 Southwest Airlines 5 2026-06-08
SWA3109 - 5 2026-04-13
SWA3 - 5 2026-06-25
SWA2266 - 5 2026-07-11
SWA758 Southwest Airlines 4 2026-04-15
SWA596 Southwest Airlines 4 2026-06-09
SWA3240 Southwest Airlines 4 2026-05-19
SWA30 - 4 2026-06-25
SWA2721 Southwest Airlines 4 2026-04-16
SWA264 - 4 2026-06-16
SWA2572 - 4 2026-06-14
SWA202 Southwest Airlines 4 2026-05-31
SWA1661 - 4 2026-06-19
SWA1371 Southwest Airlines 4 2026-05-20
SWA969 - 3 2026-06-22
SWA9000 Southwest Airlines 3 2026-05-08
SWA833 Southwest Airlines 3 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA2164 - Jul 14, 23:40 UTCJul 15, 01:35 UTC1h 55m
2026-07-14 SWA2164 JAX → MDW Jul 14, 23:35 UTCJul 15, 01:30 UTC1h 56m
2026-07-14 SWA4384 - Jul 14, 19:25 UTCJul 14, 22:30 UTC3h 5m
2026-07-14 SWA826 DEN → DEN Jul 14, 14:15 UTCJul 14, 17:50 UTC3h 35m
2026-07-14 SWA2545 - Jul 14, 11:40 UTCJul 14, 12:55 UTC1h 15m
2026-07-14 SWA2267 - Jul 14, 06:05 UTCJul 14, 08:25 UTC2h 20m
2026-07-14 SWA2267 LAS → MCI Jul 14, 06:02 UTCJul 14, 08:26 UTC2h 24m
2026-07-14 SWA2267 - Jul 14, 02:45 UTCJul 14, 05:00 UTC2h 15m
2026-07-13 SWA4769 - Jul 13, 23:30 UTCJul 14, 01:35 UTC2h 5m
2026-07-13 SWA3323 PHX → SAN Jul 13, 21:35 UTCJul 13, 22:20 UTC45m
2026-07-13 SWA4586 LAS → PHX Jul 13, 19:40 UTCJul 13, 20:30 UTC50m
2026-07-13 SWA2333 - Jul 13, 16:20 UTCJul 13, 17:00 UTC40m
2026-07-13 SWA2333 ONT → LAS Jul 13, 16:16 UTCJul 13, 16:59 UTC43m
2026-07-13 SWA4879 SJC → ONT Jul 13, 14:20 UTCJul 13, 15:17 UTC57m
2026-07-13 SWA4879 SJC → ONT Jul 13, 14:20 UTCJul 13, 15:20 UTC1h 0m
2026-07-13 SWA3164 - Jul 13, 04:55 UTCJul 13, 05:45 UTC50m
2026-07-13 SWA523 AUS → ONT Jul 13, 01:40 UTCJul 13, 04:00 UTC2h 20m
2026-07-12 SWA3295 STL → AUS Jul 12, 22:30 UTCJul 13, 00:20 UTC1h 50m
2026-07-12 SWA931 - Jul 12, 20:01 UTCJul 12, 21:25 UTC1h 25m
2026-07-12 SWA931 - Jul 12, 17:35 UTCJul 12, 18:55 UTC1h 20m
2026-07-12 SWA158 ATL → AUS Jul 12, 14:25 UTCJul 12, 16:20 UTC1h 55m
2026-07-12 SWA158 ATL → AUS Jul 12, 14:26 UTCJul 12, 16:11 UTC1h 45m
2026-07-12 SWA1261 - Jul 12, 11:15 UTCJul 12, 12:55 UTC1h 40m
2026-07-12 SWA1261 DAL → ATL Jul 12, 11:15 UTCJul 12, 12:55 UTC1h 40m
2026-07-12 SWA1521 DEN → DAL Jul 12, 00:25 UTCJul 12, 01:50 UTC1h 25m
2026-07-11 SWA504 - Jul 11, 20:50 UTCJul 11, 23:10 UTC2h 20m
2026-07-11 SWA2922 - Jul 11, 17:25 UTCJul 11, 18:45 UTC1h 20m
2026-07-11 SWA2922 MIA → BNA Jul 11, 17:21 UTCJul 11, 19:28 UTC2h 7m
2026-07-11 SWA581 - Jul 11, 14:30 UTCJul 11, 16:15 UTC1h 45m
2026-07-11 SWA496 - Jul 11, 12:10 UTCJul 11, 13:15 UTC1h 5m
2026-07-11 SWA2266 - Jul 11, 03:01 UTCJul 11, 05:15 UTC2h 15m
2026-07-11 SWA2266 - Jul 11, 00:45 UTCJul 11, 01:50 UTC1h 5m
2026-07-10 SWA2350 LAS → SJC Jul 10, 22:30 UTCJul 10, 23:30 UTC1h 0m
2026-07-10 SWA4676 - Jul 10, 20:05 UTCJul 10, 20:55 UTC50m
2026-07-10 SWA4685 - Jul 10, 18:00 UTCJul 10, 18:50 UTC50m
2026-07-10 SWA4685 - Jul 10, 15:30 UTCJul 10, 16:45 UTC1h 15m
2026-07-10 SWA1943 - Jul 10, 12:40 UTCJul 10, 14:20 UTC1h 40m
2026-07-10 SWA4617 - Jul 10, 03:50 UTCJul 10, 05:30 UTC1h 40m
2026-07-10 SWA241 ATL → STL Jul 10, 01:20 UTCJul 10, 02:35 UTC1h 15m
2026-07-09 SWA1263 DAL → ATL Jul 9, 22:30 UTCJul 10, 00:10 UTC1h 40m
2026-07-09 SWA1263 DAL → ATL Jul 9, 22:27 UTCJul 10, 00:05 UTC1h 38m
2026-07-09 SWA1263 - Jul 9, 18:30 UTCJul 9, 21:20 UTC2h 50m
2026-07-09 SWA3937 - Jul 9, 13:45 UTCJul 9, 17:10 UTC3h 25m
2026-07-09 SWA679 - Jul 9, 11:25 UTCJul 9, 12:10 UTC45m
2026-07-09 SWA2651 AUS → BNA Jul 9, 02:20 UTCJul 9, 04:00 UTC1h 40m
2026-07-09 SWA882 - Jul 9, 00:10 UTCJul 9, 01:35 UTC1h 25m
2026-07-08 SWA882 - Jul 8, 22:20 UTCJul 8, 23:20 UTC1h 0m
2026-07-08 SWA4237 SFO → PHX Jul 8, 19:40 UTCJul 8, 21:15 UTC1h 35m
2026-07-08 SWA2934 LAS → SFO Jul 8, 16:55 UTCJul 8, 18:05 UTC1h 10m
2026-07-08 SWA2934 LAS → SFO Jul 8, 16:54 UTCJul 8, 18:04 UTC1h 10m

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 N8558Z page for operator, model, and routing details .

Mode-S ABBD73 frequently asked

What is Mode-S code ABBD73?
ABBD73 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8558Z.
Where is Mode-S ABBD73 registered?
Mode-S code ABBD73 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 ABBD73 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 ABBD73, octal 52736563, decimal 11,255,155.
What flights does ABBD73 operate?
Mode-S ABBD73 has broadcast 20 distinct callsigns, including SWA4685, SWA4020, SWA1263, SWA3141, SWA3109.