Apparatus

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sensors Mode-S transponder

A0C20F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N148SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A0C20F
Octal
50141017
Decimal
10,535,439
Country
US
Tail
N148SY
Type
E75L
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
645
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A0C20F.

Country allocation

The ICAO 24-bit address A0C20F 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
SKW5623 - 8 2026-07-09
SKW4746 SkyWest Airlines 8 2026-07-23
SKW5941 - 6 2026-06-20
SKW5763 - 6 2026-07-11
SKW5540 SkyWest Airlines 6 2026-07-25
SKW5216 - 6 2026-07-02
SKW4638 SkyWest Airlines 6 2026-06-04
SKW5830 SkyWest Airlines 5 2026-05-16
SKW5690 SkyWest Airlines 5 2026-07-21
SKW5491 SkyWest Airlines 5 2026-07-23
SKW5479 - 5 2026-06-26
SKW4763 SkyWest Airlines 5 2026-06-27
SKW4706 - 5 2026-07-13
SKW4637 SkyWest Airlines 5 2026-06-04
SKW6036 - 4 2026-06-26
SKW6014 - 4 2026-07-09
SKW6001 SkyWest Airlines 4 2026-06-14
SKW5938 - 4 2026-07-08
SKW5795 - 4 2026-07-10
SKW5786 - 4 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW6030 ORD → CHO Jul 26, 21:40 UTCJul 26, 21:45 UTC5m
2026-07-26 SKW5972 SBA → SFO Jul 26, 18:50 UTCJul 26, 19:55 UTC1h 5m
2026-07-26 SKW5497 DEN → ICT Jul 26, 16:35 UTCJul 26, 17:35 UTC1h 0m
2026-07-26 SKW5667 ORD → MSN Jul 26, 11:15 UTCJul 26, 12:35 UTC1h 20m
2026-07-26 SKW4712 ORD → CHA Jul 26, 03:13 UTCJul 26, 04:25 UTC1h 12m
2026-07-26 SKW4712 ORD → CHA Jul 26, 03:15 UTCJul 26, 04:30 UTC1h 15m
2026-07-26 SKW5755 GJT → DEN Jul 26, 01:10 UTCJul 26, 01:45 UTC35m
2026-07-25 SKW498K DEN → RIW Jul 25, 23:05 UTCJul 25, 23:25 UTC20m
2026-07-25 SKW5540 BUR → SFO Jul 25, 19:50 UTCJul 25, 21:50 UTC2h 0m
2026-07-25 SKW752U SFO → RDD Jul 25, 17:50 UTCJul 25, 18:25 UTC35m
2026-07-25 SKW5596 MTY → SFO Jul 25, 11:45 UTCJul 25, 14:50 UTC3h 5m
2026-07-25 SKW5242 ORD → ROC Jul 25, 00:10 UTCJul 25, 01:15 UTC1h 5m
2026-07-25 SKW5242 ORD → ROC Jul 25, 00:07 UTCJul 25, 01:10 UTC1h 3m
2026-07-24 SKW5376 ERI → ORD Jul 24, 20:50 UTCJul 24, 21:50 UTC1h 0m
2026-07-24 SKW5376 ERI → ORD Jul 24, 20:52 UTCJul 24, 21:41 UTC49m
2026-07-24 SKW5692 CID → DEN Jul 24, 18:20 UTCJul 24, 19:30 UTC1h 10m
2026-07-24 SKW5901 ORD → FAR Jul 24, 15:00 UTCJul 24, 16:45 UTC1h 45m
2026-07-24 SKW5477 MBS → ORD Jul 24, 12:10 UTCJul 24, 13:50 UTC1h 40m
2026-07-23 SKW5435 SFO → RDM Jul 23, 23:15 UTCJul 23, 23:55 UTC40m
2026-07-23 SKW5985 DEN → BHM Jul 23, 21:05 UTCJul 23, 21:40 UTC35m
2026-07-23 SKW4746 ONT → SFO Jul 23, 18:15 UTCJul 23, 19:05 UTC50m
2026-07-23 SKW4746 ONT → SFO Jul 23, 18:14 UTCJul 23, 18:48 UTC34m
2026-07-23 SKW4648 MBS → ORD Jul 23, 16:05 UTCJul 23, 16:50 UTC45m
2026-07-23 SKW5491 SGF → ORD Jul 23, 12:25 UTCJul 23, 13:51 UTC1h 26m
2026-07-23 SKW5491 SGF → ORD Jul 23, 12:10 UTCJul 23, 14:10 UTC2h 0m
2026-07-23 SKW5645 JAC → SFO Jul 23, 02:00 UTCJul 23, 03:50 UTC1h 50m
2026-07-22 SKW5264 TUS → SFO Jul 22, 23:20 UTCJul 22, 23:40 UTC20m
2026-07-22 SKW5264 TUS → SFO Jul 22, 22:30 UTCJul 22, 23:40 UTC1h 10m
2026-07-22 SKW5264 TUS → SFO Jul 22, 22:41 UTCJul 22, 23:04 UTC23m
2026-07-22 SKW5867 OKC → ORD Jul 22, 20:35 UTCJul 22, 21:25 UTC50m
2026-07-22 SKW5901 ORD → FAR Jul 22, 15:20 UTCJul 22, 17:20 UTC2h 0m
2026-07-22 SKW5477 MBS → ORD Jul 22, 12:10 UTCJul 22, 13:50 UTC1h 40m
2026-07-22 SKW6012 ORD → COU Jul 22, 01:35 UTCJul 22, 02:05 UTC30m
2026-07-21 SKW6012 ORD → COU Jul 21, 22:45 UTCJul 22, 02:05 UTC3h 20m
2026-07-21 SKW6012 ORD → COU Jul 21, 22:48 UTCJul 22, 01:16 UTC2h 28m
2026-07-21 SKW545H - Jul 21, 19:45 UTCJul 21, 21:40 UTC1h 55m
2026-07-21 SKW5517 LAX → MFR Jul 21, 17:15 UTCJul 21, 17:50 UTC35m
2026-07-21 SKW5668 ORD → DCA Jul 21, 14:40 UTCJul 21, 15:10 UTC30m
2026-07-21 SKW5690 SGF → IAH Jul 21, 13:10 UTCJul 21, 13:20 UTC10m
2026-07-21 SKW5690 SGF → IAH Jul 21, 11:10 UTCJul 21, 13:20 UTC2h 10m
2026-07-21 SKW5690 SGF → IAH Jul 21, 10:59 UTCJul 21, 12:54 UTC1h 55m
2026-07-21 SKW745P ORD → ORF Jul 21, 00:25 UTCJul 21, 02:15 UTC1h 50m
2026-07-20 SKW745P ORD → ORF Jul 20, 23:49 UTCJul 21, 02:10 UTC2h 21m
2026-07-20 SKW4699 BZN → SFO Jul 20, 21:50 UTCJul 20, 22:00 UTC10m
2026-07-20 SKW4699 BZN → SFO Jul 20, 19:55 UTCJul 20, 22:00 UTC2h 5m
2026-07-20 SKW4699 BZN → SFO Jul 20, 20:01 UTCJul 20, 21:34 UTC1h 33m
2026-07-20 SKW5932 - Jul 20, 16:50 UTCJul 20, 18:25 UTC1h 35m
2026-07-20 SKW5500 SMF → SFO Jul 20, 11:00 UTCJul 20, 12:30 UTC1h 30m
2026-07-19 SKW5405 - Jul 19, 23:20 UTCJul 20, 00:45 UTC1h 25m
2026-07-19 SKW4648 MBS → ORD Jul 19, 18:20 UTCJul 19, 21:00 UTC2h 40m

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 N148SY page for operator, model, and routing details .

Mode-S A0C20F frequently asked

What is Mode-S code A0C20F?
A0C20F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N148SY.
Where is Mode-S A0C20F registered?
Mode-S code A0C20F 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 A0C20F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0C20F, octal 50141017, decimal 10,535,439.
What flights does A0C20F operate?
Mode-S A0C20F has broadcast 20 distinct callsigns, including SKW5623, SKW4746, SKW5941, SKW5763, SKW5540.