Apparatus

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sensors Mode-S transponder

A16D89

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N191SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A16D89
Octal
50266611
Decimal
10,579,337
Country
US
Tail
N191SY
Type
E75L
No current signal · last broadcast Jul 26, 21:10 UTC
Flights observed
606
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:10 UTC

Last known position

Most recent position reported by Mode-S A16D89.

Country allocation

The ICAO 24-bit address A16D89 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
SKW847E - 9 2026-06-26
SKW3400 - 9 2026-06-15
SKW3337 - 7 2026-07-18
SKW3285 SkyWest Airlines 7 2026-07-21
SKW3470 SkyWest Airlines 6 2026-05-20
SKW3433 - 6 2026-07-09
SKW3298 - 6 2026-07-09
SKW3294 SkyWest Airlines 6 2026-07-08
SKW9791 - 5 2026-07-13
SKW3488 - 5 2026-07-07
SKW3448 - 5 2026-07-21
SKW3440 SkyWest Airlines 5 2026-06-13
SKW3423 SkyWest Airlines 5 2026-06-04
SKW3320 SkyWest Airlines 5 2026-07-26
SKW3283 SkyWest Airlines 5 2026-06-09
SKW3248 SkyWest Airlines 5 2026-07-19
SKW3224 SkyWest Airlines 5 2026-05-30
SKW3193 SkyWest Airlines 5 2026-06-05
SKW3132 SkyWest Airlines 5 2026-07-25
SKW3115 - 5 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3346 LAX → SFO Jul 26, 20:25 UTCJul 26, 21:10 UTC45m
2026-07-26 SKW3313 RDM → SFO Jul 26, 17:50 UTCJul 26, 19:10 UTC1h 20m
2026-07-26 SKW3313 RDM → SFO Jul 26, 17:51 UTCJul 26, 19:01 UTC1h 10m
2026-07-26 SKW3320 SJC → PDX Jul 26, 15:40 UTCJul 26, 16:45 UTC1h 5m
2026-07-26 SKW3402 SFO → LAX Jul 26, 13:10 UTCJul 26, 14:05 UTC55m
2026-07-26 SKW3133 LAX → SEA Jul 26, 02:30 UTCJul 26, 03:10 UTC40m
2026-07-26 SKW3133 LAX → SEA Jul 26, 02:29 UTCJul 26, 03:14 UTC45m
2026-07-25 SKW3484 SJC → PDX Jul 25, 23:30 UTCJul 26, 01:20 UTC1h 50m
2026-07-25 SKW3350 SJC → PDX Jul 25, 18:15 UTCJul 25, 19:05 UTC50m
2026-07-25 SKW3132 BOI → SFO Jul 25, 16:06 UTCJul 25, 16:40 UTC34m
2026-07-25 SKW3132 BOI → SFO Jul 25, 16:10 UTCJul 25, 16:45 UTC35m
2026-07-25 SKW3385 SJC → LAX Jul 25, 13:25 UTCJul 25, 13:50 UTC25m
2026-07-25 SKW3102 LAX → SFO Jul 25, 05:00 UTCJul 25, 05:25 UTC25m
2026-07-25 SKW9792 PSP → SFO Jul 25, 00:45 UTCJul 25, 02:15 UTC1h 30m
2026-07-23 SKW3476 RDM → SFO Jul 23, 00:15 UTCJul 23, 01:25 UTC1h 10m
2026-07-22 SKW3349 PSP → SFO Jul 22, 19:05 UTCJul 22, 21:40 UTC2h 35m
2026-07-22 SKW3351 SAN → SJC Jul 22, 15:45 UTCJul 22, 17:55 UTC2h 10m
2026-07-22 SKW3050 SEA → EUG Jul 22, 13:10 UTCJul 22, 14:20 UTC1h 10m
2026-07-22 SKW3410 PSP → SFO Jul 22, 04:10 UTCJul 22, 05:25 UTC1h 15m
2026-07-22 SKW3410 PSP → SFO Jul 22, 04:08 UTCJul 22, 05:42 UTC1h 34m
2026-07-21 SKW3498 SAN → FCA Jul 21, 23:10 UTCJul 22, 02:55 UTC3h 45m
2026-07-21 SKW3489 MRY → SAN Jul 21, 21:05 UTCJul 21, 22:05 UTC1h 0m
2026-07-21 SKW3013 PHX → SJC Jul 21, 18:03 UTCJul 21, 19:29 UTC1h 26m
2026-07-21 SKW3132 BOI → SFO Jul 21, 16:30 UTCJul 21, 17:05 UTC35m
2026-07-21 SKW3448 BLI → SEA Jul 21, 13:20 UTCJul 21, 13:33 UTC13m
2026-07-21 SKW3106 SAN → SJC Jul 21, 04:45 UTCJul 21, 05:25 UTC40m
2026-07-21 SKW3285 LAX → SEA Jul 21, 01:10 UTCJul 21, 02:30 UTC1h 20m
2026-07-20 SKW3285 LAX → SEA Jul 20, 22:20 UTCJul 20, 23:45 UTC1h 25m
2026-07-20 SKW3074 LAX → SFO Jul 20, 20:05 UTCJul 20, 20:35 UTC30m
2026-07-20 SKW3073 PDX → RDM Jul 20, 18:20 UTCJul 20, 18:50 UTC30m
2026-07-20 SKW3132 BOI → SFO Jul 20, 16:10 UTCJul 20, 16:50 UTC40m
2026-07-20 SKW3132 BOI → SFO Jul 20, 16:06 UTCJul 20, 16:36 UTC30m
2026-07-20 SKW3385 - Jul 20, 13:25 UTCJul 20, 13:55 UTC30m
2026-07-20 SKW3102 LAX → SFO Jul 20, 04:50 UTCJul 20, 05:15 UTC25m
2026-07-20 SKW3048 PDX → SEA Jul 20, 02:30 UTCJul 20, 03:20 UTC50m
2026-07-19 SKW3107 SJC → SAN Jul 19, 23:30 UTCJul 20, 01:05 UTC1h 35m
2026-07-19 SKW3092 SAN → SJC Jul 19, 21:35 UTCJul 19, 22:35 UTC1h 0m
2026-07-19 SKW3467 FCA → LAX Jul 19, 19:10 UTCJul 19, 20:25 UTC1h 15m
2026-07-19 SKW3450 SNA → SFO Jul 19, 17:00 UTCJul 19, 18:10 UTC1h 10m
2026-07-19 SKW3497 LAX → PDX Jul 19, 14:50 UTCJul 19, 15:55 UTC1h 5m
2026-07-19 SKW3356 - Jul 19, 05:10 UTCJul 19, 06:10 UTC1h 0m
2026-07-19 SKW3248 SJC → SEA Jul 19, 02:45 UTCJul 19, 03:50 UTC1h 5m
2026-07-19 SKW3248 SJC → SEA Jul 19, 02:39 UTCJul 19, 03:45 UTC1h 6m
2026-07-18 SKW3494 SNA → SFO Jul 18, 23:05 UTCJul 19, 00:15 UTC1h 10m
2026-07-18 SKW3208 SFO → SFO Jul 18, 16:30 UTCJul 18, 21:20 UTC4h 50m
2026-07-18 SKW3251 - Jul 18, 14:05 UTCJul 18, 15:05 UTC1h 0m
2026-07-18 SKW3464 - Jul 18, 04:35 UTCJul 18, 05:45 UTC1h 10m
2026-07-18 SKW3232 SAN → SFO Jul 18, 02:19 UTCJul 18, 03:35 UTC1h 16m
2026-07-18 SKW3337 - Jul 18, 00:00 UTCJul 18, 01:20 UTC1h 20m
2026-07-17 SKW3352 - Jul 17, 21:34 UTCJul 17, 22:40 UTC1h 5m

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 N191SY page for operator, model, and routing details .

Mode-S A16D89 frequently asked

What is Mode-S code A16D89?
A16D89 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N191SY.
Where is Mode-S A16D89 registered?
Mode-S code A16D89 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 A16D89 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A16D89, octal 50266611, decimal 10,579,337.
What flights does A16D89 operate?
Mode-S A16D89 has broadcast 20 distinct callsigns, including SKW847E, SKW3400, SKW3337, SKW3285, SKW3470.