Apparatus

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sensors Mode-S transponder

AD1DA9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N944SW · BOMBARDIER Regional Jet CRJ-200 · operated by SKYWEST AIRLINES INC

Hex
AD1DA9
Octal
53216651
Decimal
11,345,321
Country
US
Tail
N944SW
Type
CRJ2
No current signal · last broadcast 7h ago
Flights observed
553
Distinct callsigns
20
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S AD1DA9.

Country allocation

The ICAO 24-bit address AD1DA9 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
SKW5220 SkyWest Airlines 18 2026-05-15
SKW5323 SkyWest Airlines 16 2026-05-15
SKW4729 SkyWest Airlines 16 2026-05-14
SKW5566 - 14 2026-06-17
SKW5248 SkyWest Airlines 14 2026-05-13
SKW5997 SkyWest Airlines 13 2026-05-13
SKW5961 SkyWest Airlines 13 2026-05-15
SKW5460 SkyWest Airlines 13 2026-05-15
SKW5238 SkyWest Airlines 13 2026-04-25
SKW5796 SkyWest Airlines 12 2026-05-15
SKW5539 SkyWest Airlines 12 2026-05-15
SKW5737 SkyWest Airlines 11 2026-05-10
SKW5627 SkyWest Airlines 11 2026-05-03
SKW514L SkyWest Airlines 9 2026-05-14
SKW789T SkyWest Airlines 8 2026-05-14
SKW5895 SkyWest Airlines 8 2026-05-14
SKW5479 SkyWest Airlines 7 2026-04-23
SKW5383 SkyWest Airlines 6 2026-04-28
SKW4769 SkyWest Airlines 6 2026-04-28
SKW4750 SkyWest Airlines 6 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 SKW5207 - Jul 13, 21:25 UTCJul 13, 21:35 UTC10m
2026-07-13 SKW5207 CAK → ORD Jul 13, 20:47 UTCJul 13, 21:10 UTC23m
2026-07-13 SKW5207 CAK → ORD Jul 13, 20:30 UTCJul 13, 21:35 UTC1h 5m
2026-07-12 SKW476T ORD → CAK Jul 12, 23:25 UTCJul 13, 00:25 UTC1h 0m
2026-07-12 SKW5436 - Jul 12, 21:40 UTCJul 12, 21:50 UTC10m
2026-07-12 SKW5436 - Jul 12, 21:10 UTCJul 12, 21:50 UTC40m
2026-07-12 SKW5436 FWA → ORD Jul 12, 21:00 UTCJul 12, 21:24 UTC24m
2026-07-12 SKW393H - Jul 12, 19:20 UTCJul 12, 19:45 UTC25m
2026-07-12 SKW5807 - Jul 12, 15:45 UTCJul 12, 16:15 UTC30m
2026-07-12 SKW5807 PIA → ORD Jul 12, 16:00 UTCJul 12, 16:14 UTC14m
2026-07-12 SKW5949 - Jul 12, 14:15 UTCJul 12, 14:45 UTC30m
2026-07-12 SKW5949 ORD → PIA Jul 12, 14:19 UTCJul 12, 14:48 UTC29m
2026-07-12 SKW4639 ATW → ORD Jul 12, 11:43 UTCJul 12, 11:59 UTC16m
2026-07-12 SKW4639 - Jul 12, 11:25 UTCJul 12, 12:15 UTC50m
2026-07-11 SKW4772 ORD → ATW Jul 11, 23:55 UTCJul 12, 00:25 UTC30m
2026-07-11 SKW4772 ORD → ATW Jul 11, 23:42 UTCJul 12, 00:24 UTC42m
2026-07-11 SKW5335 - Jul 11, 20:05 UTCJul 11, 21:35 UTC1h 30m
2026-07-11 SKW5282 - Jul 11, 17:45 UTCJul 11, 19:05 UTC1h 20m
2026-07-11 SKW5086 - Jul 11, 11:10 UTCJul 11, 12:50 UTC1h 40m
2026-07-11 SKW5094 - Jul 11, 01:10 UTCJul 11, 02:50 UTC1h 40m
2026-07-10 SKW5073 - Jul 10, 22:35 UTCJul 10, 23:05 UTC30m
2026-07-10 SKW459L - Jul 10, 20:50 UTCJul 10, 21:10 UTC20m
2026-07-10 SKW5139 - Jul 10, 19:20 UTCJul 10, 20:00 UTC40m
2026-07-10 SKW5086 - Jul 10, 17:10 UTCJul 10, 17:45 UTC35m
2026-07-10 SKW5803 - Jul 10, 14:20 UTCJul 10, 15:45 UTC1h 25m
2026-07-09 SKW5597 - Jul 9, 23:50 UTCJul 10, 01:00 UTC1h 10m
2026-07-09 SKW5044 - Jul 9, 21:20 UTCJul 9, 21:50 UTC30m
2026-07-09 SKW753F - Jul 9, 19:30 UTCJul 9, 19:50 UTC20m
2026-07-09 SKW753F IAH → AEX Jul 9, 19:31 UTCJul 9, 19:58 UTC27m
2026-07-09 SKW6066 - Jul 9, 17:20 UTCJul 9, 18:10 UTC50m
2026-07-09 SKW535A - Jul 9, 15:05 UTCJul 9, 15:50 UTC45m
2026-07-09 SKW5086 - Jul 9, 11:15 UTCJul 9, 12:55 UTC1h 40m
2026-07-09 SKW5094 - Jul 9, 01:10 UTCJul 9, 02:40 UTC1h 30m
2026-07-08 SKW5959 - Jul 8, 23:20 UTCJul 8, 23:50 UTC30m
2026-07-08 SKW6026 - Jul 8, 21:25 UTCJul 8, 22:05 UTC40m
2026-07-08 SKW5128 - Jul 8, 19:00 UTCJul 8, 20:20 UTC1h 20m
2026-07-08 SKW436K - Jul 8, 16:40 UTCJul 8, 17:55 UTC1h 15m
2026-07-08 SKW5088 - Jul 8, 13:40 UTCJul 8, 14:15 UTC35m
2026-07-08 SKW5088 MEI → IAH Jul 8, 13:30 UTCJul 8, 14:33 UTC1h 3m
2026-07-07 SKW730C - Jul 7, 22:50 UTCJul 7, 23:45 UTC55m
2026-07-07 SKW5139 - Jul 7, 19:10 UTCJul 7, 20:00 UTC50m
2026-07-07 SKW5086 - Jul 7, 17:10 UTCJul 7, 17:55 UTC45m
2026-07-07 SKW5086 IAH → HEZ Jul 7, 17:13 UTCJul 7, 17:54 UTC41m
2026-07-07 SKW5347 - Jul 7, 14:45 UTCJul 7, 15:20 UTC35m
2026-07-07 SKW5347 SHV → IAH Jul 7, 14:42 UTCJul 7, 15:20 UTC38m
2026-07-07 SKW4682 - Jul 7, 02:05 UTCJul 7, 02:45 UTC40m
2026-07-06 SKW5069 - Jul 6, 23:10 UTCJul 7, 00:35 UTC1h 25m
2026-07-06 SKW6081 - Jul 6, 20:55 UTCJul 6, 22:15 UTC1h 20m
2026-07-06 SKW6081 IAH → SLN Jul 6, 21:04 UTCJul 6, 22:17 UTC1h 13m
2026-07-06 SKW5129 - Jul 6, 18:45 UTCJul 6, 19:40 UTC55m

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 N944SW page for operator, model, and routing details .

Mode-S AD1DA9 frequently asked

What is Mode-S code AD1DA9?
AD1DA9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N944SW.
Where is Mode-S AD1DA9 registered?
Mode-S code AD1DA9 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 AD1DA9 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD1DA9, octal 53216651, decimal 11,345,321.
What flights does AD1DA9 operate?
Mode-S AD1DA9 has broadcast 20 distinct callsigns, including SKW5220, SKW5323, SKW4729, SKW5566, SKW5248.