Apparatus

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sensors Mode-S transponder

A9C2DE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N728SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A9C2DE
Octal
52341336
Decimal
11,125,470
Country
US
Tail
N728SK
Type
CRJ7
Broadcasting now · callsign SKW5010 · 9,950 ft
Flights observed
718
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Current position

A9C2DE is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9C2DE 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
SKW6372 - 19 2026-06-30
SKW4905 - 19 2026-07-04
SKW4910 - 18 2026-07-05
SKW4887 - 16 2026-06-29
SKW6408 SkyWest Airlines 13 2026-07-23
SKW6376 - 12 2026-07-05
SKW6517 - 11 2026-06-17
SKW6513 - 11 2026-07-05
SKW6348 - 10 2026-07-03
SKW6298 - 10 2026-07-06
SKW4963 - 10 2026-07-11
SKW6189 - 9 2026-07-01
SKW4999 SkyWest Airlines 9 2026-04-30
SKW4937 - 9 2026-06-17
SKW6396 SkyWest Airlines 8 2026-05-18
SKW6388 - 8 2026-07-15
SKW6387 - 8 2026-07-02
SKW6295 SkyWest Airlines 8 2026-07-25
SKW6384 SkyWest Airlines 7 2026-07-25
SKW6344 SkyWest Airlines 7 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW6446 PHX → ELP Jul 26, 19:40 UTCJul 26, 21:00 UTC1h 20m
2026-07-26 SKW6446 PHX → ELP Jul 26, 17:15 UTCJul 26, 18:40 UTC1h 25m
2026-07-26 SKW6345 DFW → HRL Jul 26, 14:00 UTCJul 26, 15:30 UTC1h 30m
2026-07-26 SKW6419 PHX → IAH Jul 26, 00:10 UTCJul 26, 01:40 UTC1h 30m
2026-07-26 SKW6419 PHX → IAH Jul 26, 00:08 UTCJul 26, 01:49 UTC1h 41m
2026-07-25 SKW6384 MEM → ORD Jul 25, 21:25 UTCJul 25, 22:55 UTC1h 30m
2026-07-25 SKW6384 MEM → ORD Jul 25, 21:22 UTCJul 25, 22:46 UTC1h 24m
2026-07-25 SKW6384 MEM → ORD Jul 25, 18:05 UTCJul 25, 20:00 UTC1h 55m
2026-07-25 SKW4938 LAX → SLC Jul 25, 15:50 UTCJul 25, 16:50 UTC1h 0m
2026-07-25 SKW6405 DFW → SAF Jul 25, 02:34 UTCJul 25, 03:58 UTC1h 24m
2026-07-25 SKW6405 DFW → SAF Jul 25, 02:35 UTCJul 25, 04:00 UTC1h 25m
2026-07-25 SKW6295 PHX → SFO Jul 25, 00:20 UTCJul 25, 01:15 UTC55m
2026-07-24 SKW6295 PHX → SFO Jul 24, 21:35 UTCJul 24, 23:00 UTC1h 25m
2026-07-24 SKW6194 LAX → OKC Jul 24, 18:18 UTCJul 24, 19:51 UTC1h 33m
2026-07-24 SKW6194 LAX → OKC Jul 24, 18:10 UTCJul 24, 20:05 UTC1h 55m
2026-07-24 SKW6194 LAX → OKC Jul 24, 15:30 UTCJul 24, 17:20 UTC1h 50m
2026-07-24 SKW6340 OKC → DFW Jul 24, 13:40 UTCJul 24, 14:25 UTC45m
2026-07-24 SKW6340 OKC → DFW Jul 24, 13:35 UTCJul 24, 14:18 UTC43m
2026-07-24 SKW6284 LAX → SFO Jul 24, 03:22 UTCJul 24, 04:04 UTC42m
2026-07-24 SKW6284 LAX → SFO Jul 24, 03:25 UTCJul 24, 04:05 UTC40m
2026-07-24 SKW4894 XNA → LAX Jul 24, 01:15 UTCJul 24, 02:00 UTC45m
2026-07-23 SKW4894 XNA → LAX Jul 23, 23:35 UTCJul 24, 00:15 UTC40m
2026-07-23 SKW4980 - Jul 23, 19:55 UTCJul 23, 22:10 UTC2h 15m
2026-07-23 SKW4980 - Jul 23, 16:25 UTCJul 23, 18:35 UTC2h 10m
2026-07-23 SKW6408 ORD → FNT Jul 23, 11:55 UTCJul 23, 13:15 UTC1h 20m
2026-07-23 SKW6408 ORD → FNT Jul 23, 11:49 UTCJul 23, 13:09 UTC1h 20m
2026-07-22 SKW6267 DFW → COS Jul 22, 23:45 UTCJul 23, 01:10 UTC1h 25m
2026-07-22 SKW6267 DFW → COS Jul 22, 23:44 UTCJul 23, 01:12 UTC1h 28m
2026-07-22 SKW6390 COS → DFW Jul 22, 19:25 UTCJul 22, 20:50 UTC1h 25m
2026-07-22 SKW6390 COS → DFW Jul 22, 19:23 UTCJul 22, 20:47 UTC1h 24m
2026-07-22 SKW6390 COS → DFW Jul 22, 16:45 UTCJul 22, 18:15 UTC1h 30m
2026-07-22 SKW4917 PVU → DFW Jul 22, 12:50 UTCJul 22, 15:05 UTC2h 15m
2026-07-22 SKW4886 XNA → LAX Jul 22, 02:40 UTCJul 22, 04:50 UTC2h 10m
2026-07-22 SKW6344 PHX → SJC Jul 22, 00:10 UTCJul 22, 00:55 UTC45m
2026-07-21 SKW6344 PHX → SJC Jul 21, 22:30 UTCJul 21, 23:00 UTC30m
2026-07-21 SKW4968 LEX → ORD Jul 21, 19:55 UTCJul 21, 21:05 UTC1h 10m
2026-07-21 SKW4968 LEX → ORD Jul 21, 19:39 UTCJul 21, 21:04 UTC1h 25m
2026-07-21 SKW4968 LEX → ORD Jul 21, 17:25 UTCJul 21, 18:25 UTC1h 0m
2026-07-21 SKW6466 IDA → DFW Jul 21, 13:30 UTCJul 21, 15:45 UTC2h 15m
2026-07-21 SKW6467 DFW → IDA Jul 21, 01:35 UTCJul 21, 03:45 UTC2h 10m
2026-07-20 SKW6410 DFW → HOU Jul 20, 22:50 UTCJul 20, 23:35 UTC45m
2026-07-20 SKW6205 - Jul 20, 20:15 UTCJul 20, 22:00 UTC1h 45m
2026-07-20 SKW6205 ASE → AUS Jul 20, 19:59 UTCJul 20, 21:53 UTC1h 54m
2026-07-20 SKW6427 ORD → ASE Jul 20, 16:35 UTCJul 20, 18:50 UTC2h 15m
2026-07-20 SKW4974 CMH → ORD Jul 20, 12:55 UTCJul 20, 13:35 UTC40m
2026-07-20 SKW4972 - Jul 20, 01:55 UTCJul 20, 02:35 UTC40m
2026-07-19 SKW4990 SBP → PHX Jul 19, 22:05 UTCJul 19, 23:15 UTC1h 10m
2026-07-19 SKW4990 SBP → PHX Jul 19, 22:05 UTCJul 19, 23:10 UTC1h 5m
2026-07-19 SKW4990 SBP → PHX Jul 19, 20:05 UTCJul 19, 21:15 UTC1h 10m
2026-07-19 SKW6204 ORD → STL Jul 19, 16:15 UTCJul 19, 18:00 UTC1h 45m

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 N728SK page for operator, model, and routing details .

Mode-S A9C2DE frequently asked

What is Mode-S code A9C2DE?
A9C2DE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N728SK.
Where is Mode-S A9C2DE registered?
Mode-S code A9C2DE 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 A9C2DE broadcasting right now?
Yes. Mode-S A9C2DE is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9C2DE, octal 52341336, decimal 11,125,470.
What flights does A9C2DE operate?
Mode-S A9C2DE has broadcast 20 distinct callsigns, including SKW6372, SKW4905, SKW4910, SKW4887, SKW6408.