Apparatus

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sensors Mode-S transponder

ABBD2D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8556Z · BOEING 737-800 · operated by SOUTHWEST AIRLINES CO

Hex
ABBD2D
Octal
52736455
Decimal
11,255,085
Country
US
Tail
N8556Z
Type
B738
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
670
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S ABBD2D.

Country allocation

The ICAO 24-bit address ABBD2D 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
SWA946 - 5 2026-06-15
SWA2192 - 5 2026-06-16
SWA947 Southwest Airlines 4 2026-06-03
SWA734 - 4 2026-06-29
SWA462 Southwest Airlines 4 2026-07-23
SWA409 Southwest Airlines 4 2026-06-12
SWA3563 - 4 2026-06-20
SWA2876 - 4 2026-07-14
SWA2844 - 4 2026-06-30
SWA2708 Southwest Airlines 4 2026-04-15
SWA2214 - 4 2026-06-30
SWA2147 Southwest Airlines 4 2026-07-20
SWA873 Southwest Airlines 3 2026-06-07
SWA4632 Southwest Airlines 3 2026-06-16
SWA4605 Southwest Airlines 3 2026-04-18
SWA4428 Southwest Airlines 3 2026-06-05
SWA427 - 3 2026-07-13
SWA4127 - 3 2026-06-28
SWA4047 - 3 2026-07-13
SWA3722 - 3 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2498 SJC → BUR Jul 26, 18:10 UTCJul 26, 21:05 UTC2h 55m
2026-07-26 SWA4044 LAS → STL Jul 26, 15:05 UTCJul 26, 16:50 UTC1h 45m
2026-07-26 SWA3531 SJC → PDX Jul 26, 12:10 UTCJul 26, 13:50 UTC1h 40m
2026-07-26 SWA3531 SJC → PDX Jul 26, 12:06 UTCJul 26, 13:45 UTC1h 39m
2026-07-25 SWA4263 STL → BOS Jul 25, 23:10 UTCJul 26, 00:40 UTC1h 30m
2026-07-25 SWA4263 STL → BOS Jul 25, 23:09 UTCJul 26, 00:42 UTC1h 33m
2026-07-25 SWA4066 LGB → OAK Jul 25, 18:55 UTCJul 25, 22:00 UTC3h 5m
2026-07-25 SWA4066 LGB → OAK Jul 25, 18:53 UTCJul 25, 21:53 UTC3h 1m
2026-07-25 SWA3968 DAL → OMA Jul 25, 15:05 UTCJul 25, 17:40 UTC2h 35m
2026-07-25 SWA3968 DAL → OMA Jul 25, 15:01 UTCJul 25, 17:36 UTC2h 36m
2026-07-25 SWA2931 LGB → RNO Jul 25, 11:35 UTCJul 25, 14:00 UTC2h 25m
2026-07-25 SWA235 JAX → BWI Jul 25, 02:15 UTCJul 25, 04:25 UTC2h 10m
2026-07-25 SWA235 JAX → BWI Jul 25, 02:10 UTCJul 25, 04:16 UTC2h 6m
2026-07-24 SWA235 JAX → BWI Jul 24, 20:50 UTCJul 25, 00:45 UTC3h 55m
2026-07-24 SWA486 MDW → LGA Jul 24, 16:15 UTCJul 24, 18:35 UTC2h 20m
2026-07-24 SWA486 MDW → LGA Jul 24, 13:25 UTCJul 24, 14:55 UTC1h 30m
2026-07-24 SWA1935 SMF → ONT Jul 24, 10:45 UTCJul 24, 11:55 UTC1h 10m
2026-07-24 SWA2685 BWI → SRQ Jul 24, 00:20 UTCJul 24, 02:10 UTC1h 50m
2026-07-23 SWA3439 SAT → BWI Jul 23, 21:00 UTCJul 23, 21:15 UTC15m
2026-07-23 SWA3439 SAT → BWI Jul 23, 20:57 UTCJul 23, 22:41 UTC1h 44m
2026-07-23 SWA3379 DEN → BDL Jul 23, 18:10 UTCJul 23, 20:00 UTC1h 50m
2026-07-23 SWA3379 DEN → BDL Jul 23, 18:08 UTCJul 23, 19:58 UTC1h 50m
2026-07-23 SWA1171 MDW → BOS Jul 23, 15:00 UTCJul 23, 17:15 UTC2h 15m
2026-07-23 SWA462 MDW → LAS Jul 23, 12:00 UTCJul 23, 13:25 UTC1h 25m
2026-07-23 SWA462 MDW → LAS Jul 23, 11:59 UTCJul 23, 13:20 UTC1h 21m
2026-07-23 SWA643 LAS → LIH Jul 23, 00:50 UTCJul 23, 02:10 UTC1h 20m
2026-07-22 SWA4815 HNL → OAK Jul 22, 22:35 UTCJul 22, 23:40 UTC1h 5m
2026-07-22 SWA4815 HNL → OAK Jul 22, 22:35 UTCJul 22, 23:42 UTC1h 7m
2026-07-22 SWA1017 MCO → HOU Jul 22, 17:40 UTCJul 22, 21:10 UTC3h 30m
2026-07-22 SWA1017 MCO → HOU Jul 22, 17:38 UTCJul 22, 21:07 UTC3h 29m
2026-07-22 SWA1017 MCO → HOU Jul 22, 15:30 UTCJul 22, 16:40 UTC1h 10m
2026-07-22 SWA713 OAK → BUR Jul 22, 13:15 UTCJul 22, 14:05 UTC50m
2026-07-22 SWA449 MKE → DEN Jul 22, 04:30 UTCJul 22, 05:25 UTC55m
2026-07-22 SWA4270 LAS → SMF Jul 22, 02:35 UTCJul 22, 03:40 UTC1h 5m
2026-07-22 SWA4270 LAS → SMF Jul 22, 02:33 UTCJul 22, 03:36 UTC1h 3m
2026-07-22 SWA1833 BNA → TPA Jul 22, 00:16 UTCJul 22, 01:29 UTC1h 13m
2026-07-22 SWA1833 BNA → TPA Jul 22, 00:20 UTCJul 22, 01:35 UTC1h 15m
2026-07-21 SWA123 CMH → SRQ Jul 21, 21:50 UTCJul 21, 23:05 UTC1h 15m
2026-07-21 SWA123 CMH → SRQ Jul 21, 21:49 UTCJul 21, 23:00 UTC1h 11m
2026-07-21 SWA323 SBA → OAK Jul 21, 17:50 UTCJul 21, 20:05 UTC2h 15m
2026-07-21 SWA2459 MDW → OAK Jul 21, 14:25 UTCJul 21, 16:25 UTC2h 0m
2026-07-21 SWA440 DAL → MCI Jul 21, 12:00 UTCJul 21, 13:15 UTC1h 15m
2026-07-21 SWA440 DAL → MCI Jul 21, 11:59 UTCJul 21, 13:14 UTC1h 15m
2026-07-21 SWA4829 - Jul 21, 02:30 UTCJul 21, 03:40 UTC1h 10m
2026-07-20 SWA172 - Jul 20, 22:30 UTCJul 21, 00:30 UTC2h 0m
2026-07-20 SWA1072 - Jul 20, 19:20 UTCJul 20, 21:35 UTC2h 15m
2026-07-20 SWA1072 - Jul 20, 19:19 UTCJul 20, 21:27 UTC2h 8m
2026-07-20 SWA2147 SFO → BUR Jul 20, 16:00 UTCJul 20, 18:20 UTC2h 20m
2026-07-20 SWA4544 - Jul 20, 12:35 UTCJul 20, 14:40 UTC2h 5m
2026-07-20 SWA4508 BWI → FLL Jul 20, 06:40 UTCJul 20, 10:40 UTC4h 0m

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 N8556Z page for operator, model, and routing details .

Mode-S ABBD2D frequently asked

What is Mode-S code ABBD2D?
ABBD2D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8556Z.
Where is Mode-S ABBD2D registered?
Mode-S code ABBD2D 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 ABBD2D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABBD2D, octal 52736455, decimal 11,255,085.
What flights does ABBD2D operate?
Mode-S ABBD2D has broadcast 20 distinct callsigns, including SWA946, SWA2192, SWA947, SWA734, SWA462.