Apparatus

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sensors Mode-S transponder

A4D5C7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N410SY · operated by SKYWEST AIRLINES INC

Hex
A4D5C7
Octal
51152707
Decimal
10,802,631
Country
US
Tail
N410SY
Type
E75L
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
654
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S A4D5C7.

Country allocation

The ICAO 24-bit address A4D5C7 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
SKW3122 - 10 2026-06-26
SKW3337 - 8 2026-07-07
SKW3015 SkyWest Airlines 8 2026-05-17
SKW3111 - 7 2026-06-29
SKW3497 - 6 2026-06-20
SKW3433 - 6 2026-07-02
SKW3356 SkyWest Airlines 6 2026-06-20
SKW3315 - 6 2026-06-24
SKW3260 - 6 2026-07-17
SKW3199 - 6 2026-07-17
SKW3038 SkyWest Airlines 6 2026-07-24
SKW3024 - 6 2026-07-16
SKW3017 SkyWest Airlines 6 2026-07-25
SKW3491 SkyWest Airlines 5 2026-06-05
SKW3463 - 5 2026-06-23
SKW3410 - 5 2026-07-10
SKW3389 - 5 2026-07-12
SKW3381 SkyWest Airlines 5 2026-07-25
SKW3332 SkyWest Airlines 5 2026-05-24
SKW3302 - 5 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3220 LAX → EUG Jul 26, 20:00 UTCJul 26, 21:05 UTC1h 5m
2026-07-26 SKW3431 SJC → PSP Jul 26, 17:55 UTCJul 26, 18:25 UTC30m
2026-07-26 SKW3132 BOI → SFO Jul 26, 16:15 UTCJul 26, 16:50 UTC35m
2026-07-26 SKW3385 SJC → LAX Jul 26, 13:30 UTCJul 26, 13:50 UTC20m
2026-07-26 SKW830R SEA → YYJ Jul 26, 05:05 UTCJul 26, 05:30 UTC25m
2026-07-25 SKW3498 SAN → FCA Jul 25, 23:00 UTCJul 26, 03:40 UTC4h 40m
2026-07-25 SKW3087 SNA → SFO Jul 25, 21:10 UTCJul 25, 22:05 UTC55m
2026-07-25 SKW3088 SFO → SNA Jul 25, 19:10 UTCJul 25, 20:20 UTC1h 10m
2026-07-25 SKW3381 STS → SAN Jul 25, 15:55 UTCJul 25, 17:50 UTC1h 55m
2026-07-25 SKW3017 HPN → ORD Jul 25, 02:14 UTCJul 25, 03:25 UTC1h 11m
2026-07-25 SKW3017 HPN → ORD Jul 25, 02:00 UTCJul 25, 03:30 UTC1h 30m
2026-07-24 SKW3056 IDA → SEA Jul 24, 21:40 UTCJul 25, 00:00 UTC2h 20m
2026-07-24 SKW3038 DFW → ACT Jul 24, 18:55 UTCJul 24, 20:45 UTC1h 50m
2026-07-24 SKW3217 PDX → ONT Jul 24, 15:35 UTCJul 24, 17:50 UTC2h 15m
2026-07-24 SKW3319 SFO → SNA Jul 24, 04:05 UTCJul 24, 05:50 UTC1h 45m
2026-07-24 SKW3036 LAX → SFO Jul 24, 01:40 UTCJul 24, 02:55 UTC1h 15m
2026-07-23 SKW3035 GEG → SEA Jul 23, 23:15 UTCJul 24, 00:25 UTC1h 10m
2026-07-23 SKW3439 STS → SAN Jul 23, 21:00 UTCJul 23, 22:15 UTC1h 15m
2026-07-23 SKW3439 STS → SAN Jul 23, 20:49 UTCJul 23, 22:11 UTC1h 22m
2026-07-23 SKW3006 SEA → SFO Jul 23, 04:00 UTCJul 23, 05:10 UTC1h 10m
2026-07-23 SKW3019 SLC → ORD Jul 23, 01:30 UTCJul 23, 03:05 UTC1h 35m
2026-07-22 SKW3120 RNO → PDX Jul 22, 21:35 UTCJul 22, 23:10 UTC1h 35m
2026-07-22 SKW3062 STS → PSP Jul 22, 20:05 UTCJul 22, 20:30 UTC25m
2026-07-22 SKW3063 LAX → PDX Jul 22, 18:40 UTCJul 22, 19:05 UTC25m
2026-07-22 SKW3004 SJC → PHX Jul 22, 14:41 UTCJul 22, 16:09 UTC1h 28m
2026-07-22 SKW3004 SJC → PHX Jul 22, 14:45 UTCJul 22, 15:45 UTC1h 0m
2026-07-22 SKW3291 DFW → ASE Jul 22, 05:10 UTCJul 22, 05:25 UTC15m
2026-07-22 SKW3291 DFW → ASE Jul 22, 01:25 UTCJul 22, 03:45 UTC2h 20m
2026-07-21 SKW3202 LAX → PDX Jul 21, 23:40 UTCJul 22, 00:30 UTC50m
2026-07-21 SKW3075 STS → PSP Jul 21, 21:05 UTCJul 21, 22:40 UTC1h 35m
2026-07-21 SKW3075 STS → PSP Jul 21, 21:05 UTCJul 21, 22:39 UTC1h 34m
2026-07-21 SKW3205 SAN → SFO Jul 21, 18:53 UTCJul 21, 19:58 UTC1h 5m
2026-07-21 SKW3205 SAN → SFO Jul 21, 19:00 UTCJul 21, 20:00 UTC1h 0m
2026-07-21 SKW3402 SFO → LAX Jul 21, 16:50 UTCJul 21, 17:45 UTC55m
2026-07-21 SKW9790 STS → SFO Jul 21, 13:35 UTCJul 21, 15:15 UTC1h 40m
2026-07-20 SKW3082 - Jul 20, 03:15 UTCJul 20, 04:45 UTC1h 30m
2026-07-19 SKW3083 PDX → STS Jul 19, 21:55 UTCJul 19, 23:10 UTC1h 15m
2026-07-19 SKW3083 PDX → STS Jul 19, 21:36 UTCJul 19, 23:11 UTC1h 35m
2026-07-19 SKW3363 SFO → LAX Jul 19, 18:20 UTCJul 19, 19:55 UTC1h 35m
2026-07-19 SKW3363 SFO → LAX Jul 19, 18:28 UTCJul 19, 19:50 UTC1h 22m
2026-07-19 SKW3362 SEA → SFO Jul 19, 15:35 UTCJul 19, 16:25 UTC50m
2026-07-19 SKW3048 EUG → SEA Jul 19, 03:35 UTCJul 19, 04:25 UTC50m
2026-07-19 SKW3107 SJC → SAN Jul 19, 01:24 UTCJul 19, 02:47 UTC1h 23m
2026-07-19 SKW3107 SJC → SAN Jul 19, 01:20 UTCJul 19, 02:55 UTC1h 35m
2026-07-18 SKW3092 STS → BUR Jul 18, 23:20 UTCJul 19, 00:25 UTC1h 5m
2026-07-18 SKW3076 - Jul 18, 21:25 UTCJul 18, 22:25 UTC1h 0m
2026-07-18 SKW3049 - Jul 18, 19:00 UTCJul 18, 20:10 UTC1h 10m
2026-07-18 SKW3114 - Jul 18, 16:35 UTCJul 18, 17:40 UTC1h 5m
2026-07-18 SKW3114 LAX → STS Jul 18, 16:20 UTCJul 18, 17:35 UTC1h 15m
2026-07-18 SKW3322 - Jul 18, 13:25 UTCJul 18, 15:05 UTC1h 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 N410SY page for operator, model, and routing details .

Mode-S A4D5C7 frequently asked

What is Mode-S code A4D5C7?
A4D5C7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N410SY.
Where is Mode-S A4D5C7 registered?
Mode-S code A4D5C7 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 A4D5C7 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 A4D5C7, octal 51152707, decimal 10,802,631.
What flights does A4D5C7 operate?
Mode-S A4D5C7 has broadcast 20 distinct callsigns, including SKW3122, SKW3337, SKW3015, SKW3111, SKW3497.