Apparatus

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sensors Mode-S transponder

A08BB4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N134SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A08BB4
Octal
50105664
Decimal
10,521,524
Country
US
Tail
N134SY
Type
E75L
Broadcasting now · callsign SKW5405 · 8,625 ft
Flights observed
588
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Current position

A08BB4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A08BB4 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
SKW5875 SkyWest Airlines 7 2026-07-21
SKW5593 SkyWest Airlines 7 2026-06-16
SKW5340 - 7 2026-07-11
SKW4640 SkyWest Airlines 7 2026-06-26
SKW5663 SkyWest Airlines 6 2026-07-24
SKW5525 SkyWest Airlines 6 2026-06-16
SKW5315 SkyWest Airlines 6 2026-06-11
SKW5876 - 5 2026-07-22
SKW5625 - 5 2026-07-06
SKW5429 - 5 2026-07-11
SKW5356 - 5 2026-06-26
SKW5304 - 5 2026-07-16
SKW5287 SkyWest Airlines 5 2026-07-22
SKW5267 SkyWest Airlines 5 2026-04-23
SKW5222 SkyWest Airlines 5 2026-06-12
SKW4801 - 5 2026-06-25
SKW4712 - 5 2026-07-12
SKW5760 SkyWest Airlines 4 2026-07-20
SKW5686 SkyWest Airlines 4 2026-05-14
SKW5658 SkyWest Airlines 4 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5702 ASE → ORD Jul 26, 21:15 UTCJul 26, 23:00 UTC1h 45m
2026-07-26 SKW4703 CHA → ORD Jul 26, 16:10 UTCJul 26, 18:10 UTC2h 0m
2026-07-26 SKW4728 COU → ORD Jul 26, 10:20 UTCJul 26, 12:00 UTC1h 40m
2026-07-26 SKW5275 SUN → SFO Jul 26, 00:10 UTCJul 26, 01:20 UTC1h 10m
2026-07-25 SKW4648 MBS → ORD Jul 25, 18:35 UTCJul 25, 21:15 UTC2h 40m
2026-07-25 SKW4746 ONT → SFO Jul 25, 14:40 UTCJul 25, 17:10 UTC2h 30m
2026-07-25 SKW4651 MFR → SFO Jul 25, 10:55 UTCJul 25, 12:20 UTC1h 25m
2026-07-24 SKW5663 SFO → FAT Jul 24, 23:40 UTCJul 25, 00:50 UTC1h 10m
2026-07-24 SKW5654 SUN → ORD Jul 24, 19:45 UTCJul 24, 21:00 UTC1h 15m
2026-07-24 SKW5654 SUN → ORD Jul 24, 19:44 UTCJul 24, 21:42 UTC1h 58m
2026-07-24 SKW5473 SNA → SFO Jul 24, 16:55 UTCJul 24, 18:45 UTC1h 50m
2026-07-24 SKW5473 SNA → SFO Jul 24, 16:20 UTCJul 24, 18:44 UTC2h 24m
2026-07-24 SKW5748 EGE → SFO Jul 24, 13:20 UTCJul 24, 14:00 UTC40m
2026-07-24 SKW5698 SFO → FAT Jul 24, 03:05 UTCJul 24, 03:45 UTC40m
2026-07-24 SKW5698 SFO → FAT Jul 24, 03:01 UTCJul 24, 03:42 UTC41m
2026-07-23 SKW5588 FSD → ORD Jul 23, 23:50 UTCJul 24, 01:00 UTC1h 10m
2026-07-23 SKW5584 ORD → ABE Jul 23, 21:00 UTCJul 23, 22:00 UTC1h 0m
2026-07-23 SKW5309 SMF → SFO Jul 23, 18:25 UTCJul 23, 19:40 UTC1h 15m
2026-07-23 SKW5218 ABQ → SFO Jul 23, 16:15 UTCJul 23, 17:15 UTC1h 0m
2026-07-23 SKW5293 DEN → XWA Jul 23, 11:25 UTCJul 23, 12:25 UTC1h 0m
2026-07-23 SKW5293 DEN → XWA Jul 23, 11:20 UTCJul 23, 12:19 UTC59m
2026-07-22 SKW5287 FAT → SFO Jul 22, 23:10 UTCJul 23, 00:00 UTC50m
2026-07-22 SKW5287 FAT → SFO Jul 22, 23:24 UTCJul 22, 23:57 UTC33m
2026-07-22 SKW5382 DCA → IAH Jul 22, 19:30 UTCJul 22, 20:50 UTC1h 20m
2026-07-22 SKW5382 DCA → IAH Jul 22, 19:24 UTCJul 22, 20:37 UTC1h 13m
2026-07-22 SKW5321 ORD → CMH Jul 22, 17:25 UTCJul 22, 18:10 UTC45m
2026-07-22 SKW5876 - Jul 22, 12:50 UTCJul 22, 14:45 UTC1h 55m
2026-07-22 SKW5876 OAX → IAH Jul 22, 12:46 UTCJul 22, 14:43 UTC1h 57m
2026-07-21 SKW5875 MSY → ORD Jul 21, 22:15 UTCJul 22, 00:10 UTC1h 55m
2026-07-21 SKW5875 MSY → ORD Jul 21, 22:09 UTCJul 22, 00:21 UTC2h 12m
2026-07-21 SKW4682 CVG → ORD Jul 21, 19:33 UTCJul 21, 20:08 UTC35m
2026-07-21 SKW5297 DEN → SJC Jul 21, 17:25 UTCJul 21, 18:10 UTC45m
2026-07-21 SKW5297 DEN → SJC Jul 21, 17:27 UTCJul 21, 18:04 UTC37m
2026-07-21 SKW5373 SFO → FAT Jul 21, 13:20 UTCJul 21, 15:25 UTC2h 5m
2026-07-21 SKW5297 DEN → SJC Jul 21, 01:20 UTCJul 21, 03:35 UTC2h 15m
2026-07-20 SKW5478 ORD → GSP Jul 20, 22:55 UTCJul 20, 23:50 UTC55m
2026-07-20 SKW5760 DEN → LIT Jul 20, 20:20 UTCJul 20, 21:55 UTC1h 35m
2026-07-20 SKW5276 DCA → ORD Jul 20, 16:50 UTCJul 20, 18:05 UTC1h 15m
2026-07-20 SKW5795 ORD → TUL Jul 20, 14:05 UTCJul 20, 15:25 UTC1h 20m
2026-07-20 SKW5265 RDM → SFO Jul 20, 10:15 UTCJul 20, 11:20 UTC1h 5m
2026-07-19 SKW5638 SFO → SMF Jul 19, 21:35 UTCJul 19, 22:25 UTC50m
2026-07-19 SKW5465 ORD → HPN Jul 19, 17:30 UTCJul 19, 19:20 UTC1h 50m
2026-07-19 SKW5326 ORD → RDU Jul 19, 15:00 UTCJul 19, 16:25 UTC1h 25m
2026-07-19 SKW5902 - Jul 19, 12:10 UTCJul 19, 12:45 UTC35m
2026-07-19 SKW4740 GTF → DEN Jul 19, 00:25 UTCJul 19, 00:55 UTC30m
2026-07-18 SKW5937 SFO → SNA Jul 18, 20:35 UTCJul 18, 22:50 UTC2h 15m
2026-07-18 SKW5905 - Jul 18, 14:40 UTCJul 18, 17:00 UTC2h 20m
2026-07-18 SKW4651 MFR → SFO Jul 18, 10:45 UTCJul 18, 12:35 UTC1h 50m
2026-07-18 SKW5663 SFO → FAT Jul 18, 00:04 UTCJul 18, 01:30 UTC1h 25m
2026-07-17 SKW5663 SFO → FAT Jul 17, 23:43 UTCJul 18, 01:26 UTC1h 43m

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 N134SY page for operator, model, and routing details .

Mode-S A08BB4 frequently asked

What is Mode-S code A08BB4?
A08BB4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N134SY.
Where is Mode-S A08BB4 registered?
Mode-S code A08BB4 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 A08BB4 broadcasting right now?
Yes. Mode-S A08BB4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A08BB4, octal 50105664, decimal 10,521,524.
What flights does A08BB4 operate?
Mode-S A08BB4 has broadcast 20 distinct callsigns, including SKW5875, SKW5593, SKW5340, SKW4640, SKW5663.