Apparatus

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sensors Mode-S transponder

A1ADAB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N207SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A1ADAB
Octal
50326653
Decimal
10,595,755
Country
US
Tail
N207SY
Type
E75L
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
586
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S A1ADAB.

Country allocation

The ICAO 24-bit address A1ADAB 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
SKW5904 SkyWest Airlines 7 2026-06-20
SKW5660 - 6 2026-06-20
SKW5440 - 6 2026-06-17
SKW4774 - 6 2026-07-19
SKW4661 - 6 2026-07-04
SKW5924 - 5 2026-06-21
SKW5373 SkyWest Airlines 5 2026-07-19
SKW5351 - 5 2026-06-18
SKW5315 - 5 2026-06-28
SKW4777 - 5 2026-07-13
SKW4664 SkyWest Airlines 5 2026-07-25
SKW6001 - 4 2026-07-03
SKW5667 SkyWest Airlines 4 2026-04-24
SKW5637 SkyWest Airlines 4 2026-06-28
SKW5632 - 4 2026-07-12
SKW5596 SkyWest Airlines 4 2026-05-30
SKW5595 SkyWest Airlines 4 2026-06-09
SKW5434 - 4 2026-07-15
SKW5407 SkyWest Airlines 4 2026-06-06
SKW5358 - 4 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5451 SFO → BFL Jul 26, 20:05 UTCJul 26, 21:40 UTC1h 35m
2026-07-26 SKW5976 SHV → IAH Jul 26, 15:50 UTCJul 26, 17:30 UTC1h 40m
2026-07-26 SKW5976 SHV → IAH Jul 26, 14:55 UTCJul 26, 17:16 UTC2h 21m
2026-07-26 SKW6021 TUL → DTW Jul 26, 01:20 UTCJul 26, 04:50 UTC3h 30m
2026-07-25 SKW5318 SLC → SFO Jul 25, 21:25 UTCJul 26, 00:10 UTC2h 45m
2026-07-25 SKW5318 SLC → SFO Jul 25, 20:50 UTCJul 25, 23:36 UTC2h 46m
2026-07-25 SKW5651 SFO → ABQ Jul 25, 17:10 UTCJul 25, 19:30 UTC2h 20m
2026-07-25 SKW5651 SFO → ABQ Jul 25, 17:16 UTCJul 25, 19:30 UTC2h 14m
2026-07-25 SKW4664 SFO → ABQ Jul 25, 13:05 UTCJul 25, 14:45 UTC1h 40m
2026-07-25 SKW4664 SFO → ABQ Jul 25, 12:54 UTCJul 25, 15:01 UTC2h 7m
2026-07-24 SKW4791 SFO → RDD Jul 24, 21:00 UTCJul 24, 22:35 UTC1h 35m
2026-07-23 SKW5751 SFO → SMF Jul 23, 23:50 UTCJul 24, 01:25 UTC1h 35m
2026-07-23 SKW5751 SFO → SMF Jul 23, 23:53 UTCJul 24, 01:10 UTC1h 17m
2026-07-23 SKW5757 SAT → IAH Jul 23, 20:30 UTCJul 23, 22:10 UTC1h 40m
2026-07-23 SKW5672 SFO → ONT Jul 23, 15:10 UTCJul 23, 16:35 UTC1h 25m
2026-07-23 SKW5360 LGA → IAH Jul 23, 12:50 UTCJul 23, 14:00 UTC1h 10m
2026-07-23 SKW5360 LGA → IAH Jul 23, 12:44 UTCJul 23, 13:59 UTC1h 15m
2026-07-23 SKW5453 SFO → SAT Jul 23, 10:15 UTCJul 23, 11:15 UTC1h 0m
2026-07-21 SKW4766 - Jul 21, 21:20 UTCJul 21, 23:05 UTC1h 45m
2026-07-21 SKW4664 SFO → ABQ Jul 21, 16:10 UTCJul 21, 18:25 UTC2h 15m
2026-07-20 SKW4791 - Jul 20, 20:30 UTCJul 20, 22:10 UTC1h 40m
2026-07-20 SKW4791 ORD → BDL Jul 20, 20:37 UTCJul 20, 22:11 UTC1h 34m
2026-07-20 SKW5717 ABE → ORD Jul 20, 15:00 UTCJul 20, 16:35 UTC1h 35m
2026-07-20 SKW5325 - Jul 20, 12:45 UTCJul 20, 13:45 UTC1h 0m
2026-07-19 SKW5238 ORD → BNA Jul 19, 21:10 UTCJul 19, 23:40 UTC2h 30m
2026-07-19 SKW416K IAH → TVC Jul 19, 17:10 UTCJul 19, 19:45 UTC2h 35m
2026-07-19 SKW5373 SFO → FAT Jul 19, 13:20 UTCJul 19, 15:45 UTC2h 25m
2026-07-19 SKW4774 DEN → MKE Jul 19, 01:00 UTCJul 19, 02:55 UTC1h 55m
2026-07-19 SKW4774 DEN → MKE Jul 19, 00:57 UTCJul 19, 02:54 UTC1h 57m
2026-07-18 SKW5260 SFO → SNA Jul 18, 21:50 UTCJul 18, 23:45 UTC1h 55m
2026-07-18 SKW5765 - Jul 18, 19:55 UTCJul 18, 20:30 UTC35m
2026-07-18 SKW5765 IAH → SHV Jul 18, 19:47 UTCJul 18, 20:29 UTC42m
2026-07-18 SKW5373 SFO → FAT Jul 18, 14:10 UTCJul 18, 16:25 UTC2h 15m
2026-07-18 SKW4774 DEN → MKE Jul 18, 00:00 UTCJul 18, 01:54 UTC1h 55m
2026-07-18 SKW4774 DEN → MKE Jul 18, 00:01 UTCJul 18, 01:54 UTC1h 53m
2026-07-17 SKW5388 DEN → HLN Jul 17, 18:00 UTCJul 17, 22:25 UTC4h 25m
2026-07-17 SKW5558 - Jul 17, 13:35 UTCJul 17, 14:44 UTC1h 10m
2026-07-17 SKW5558 MKE → DEN Jul 17, 13:33 UTCJul 17, 15:48 UTC2h 15m
2026-07-17 SKW5362 ORD → MKE Jul 17, 02:59 UTCJul 17, 03:20 UTC20m
2026-07-16 SKW5588 - Jul 16, 23:55 UTCJul 17, 01:20 UTC1h 25m
2026-07-16 SKW5584 ORD → PIT Jul 16, 21:40 UTCJul 16, 22:49 UTC1h 10m
2026-07-16 SKW5584 ORD → PIT Jul 16, 21:23 UTCJul 16, 22:48 UTC1h 25m
2026-07-16 SKW5465 - Jul 16, 17:45 UTCJul 16, 19:40 UTC1h 55m
2026-07-16 SKW5326 - Jul 16, 14:29 UTCJul 16, 16:05 UTC1h 35m
2026-07-16 SKW5611 - Jul 16, 11:15 UTCJul 16, 12:25 UTC1h 10m
2026-07-16 SKW5611 OMA → ORD Jul 16, 11:23 UTCJul 16, 12:13 UTC50m
2026-07-16 SKW5777 - Jul 16, 01:25 UTCJul 16, 02:30 UTC1h 5m
2026-07-15 SKW5929 - Jul 15, 22:35 UTCJul 15, 22:45 UTC10m
2026-07-15 SKW5929 SDF → ORD Jul 15, 22:06 UTCJul 15, 23:23 UTC1h 17m
2026-07-15 SKW5412 - Jul 15, 20:05 UTCJul 15, 20:55 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 N207SY page for operator, model, and routing details .

Mode-S A1ADAB frequently asked

What is Mode-S code A1ADAB?
A1ADAB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N207SY.
Where is Mode-S A1ADAB registered?
Mode-S code A1ADAB 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 A1ADAB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1ADAB, octal 50326653, decimal 10,595,755.
What flights does A1ADAB operate?
Mode-S A1ADAB has broadcast 20 distinct callsigns, including SKW5904, SKW5660, SKW5440, SKW4774, SKW4661.