Apparatus

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sensors Mode-S transponder

A9A404

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N720EV · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A9A404
Octal
52322004
Decimal
11,117,572
Country
US
Tail
N720EV
Type
CRJ7
Broadcasting now · callsign SKW4921 · 36,000 ft
Flights observed
778
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:05 UTC

Current position

A9A404 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9A404 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
SKW6311 SkyWest Airlines 13 2026-05-28
SKW6365 SkyWest Airlines 11 2026-05-03
SKW6321 SkyWest Airlines 11 2026-04-30
SKW6428 SkyWest Airlines 10 2026-05-04
SKW4949 - 10 2026-07-01
SKW6437 SkyWest Airlines 9 2026-07-22
SKW6426 SkyWest Airlines 9 2026-06-02
SKW6429 SkyWest Airlines 8 2026-05-13
SKW6386 SkyWest Airlines 8 2026-06-11
SKW6357 SkyWest Airlines 8 2026-05-14
SKW6363 - 7 2026-07-02
SKW6317 SkyWest Airlines 7 2026-05-23
SKW6255 SkyWest Airlines 7 2026-04-25
SKW6231 SkyWest Airlines 7 2026-07-24
SKW5002 - 7 2026-07-14
SKW4934 SkyWest Airlines 7 2026-05-26
SKW4907 - 7 2026-07-13
SKW6445 - 6 2026-07-15
SKW6412 - 6 2026-06-24
SKW6410 SkyWest Airlines 6 2026-05-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4957 DFW → GGG Jul 26, 18:05 UTCJul 26, 20:05 UTC2h 0m
2026-07-26 SKW4957 DFW → GGG Jul 26, 14:50 UTCJul 26, 16:45 UTC1h 55m
2026-07-26 SKW4910 ORD → IND Jul 26, 12:35 UTCJul 26, 13:50 UTC1h 15m
2026-07-26 SKW4905 LAX → ELP Jul 26, 03:20 UTCJul 26, 04:45 UTC1h 25m
2026-07-26 SKW4905 LAX → ELP Jul 26, 03:16 UTCJul 26, 05:04 UTC1h 48m
2026-07-25 SKW5012 IAH → PHX Jul 25, 23:40 UTCJul 26, 01:20 UTC1h 40m
2026-07-25 SKW5012 IAH → PHX Jul 25, 20:45 UTCJul 25, 22:15 UTC1h 30m
2026-07-25 SKW4945 TXK → DFW Jul 25, 01:45 UTCJul 25, 03:15 UTC1h 30m
2026-07-24 SKW4947 IDA → PHX Jul 24, 23:45 UTCJul 25, 00:40 UTC55m
2026-07-24 SKW6473 ICT → PHX Jul 24, 18:40 UTCJul 24, 20:40 UTC2h 0m
2026-07-24 SKW6473 ICT → PHX Jul 24, 18:37 UTCJul 24, 20:37 UTC2h 0m
2026-07-24 SKW5007 PSC → PHX Jul 24, 16:25 UTCJul 24, 17:50 UTC1h 25m
2026-07-24 SKW5007 PSC → PHX Jul 24, 16:23 UTCJul 24, 17:47 UTC1h 24m
2026-07-24 SKW6213 ORD → SGF Jul 24, 14:35 UTCJul 24, 15:00 UTC25m
2026-07-24 SKW9909 BHM → ORD Jul 24, 13:15 UTCJul 24, 13:45 UTC30m
2026-07-24 SKW6231 ORD → FSD Jul 24, 10:45 UTCJul 24, 12:05 UTC1h 20m
2026-07-24 SKW6198 OKC → ORD Jul 24, 02:25 UTCJul 24, 03:45 UTC1h 20m
2026-07-24 SKW6234 ORD → ICT Jul 24, 00:30 UTCJul 24, 01:00 UTC30m
2026-07-23 SKW6234 ORD → ICT Jul 23, 22:45 UTCJul 23, 23:15 UTC30m
2026-07-23 SKW6238 LAX → SFO Jul 23, 19:40 UTCJul 23, 20:55 UTC1h 15m
2026-07-23 SKW6238 LAX → SFO Jul 23, 17:35 UTCJul 23, 18:50 UTC1h 15m
2026-07-23 SKW6466 IDA → DFW Jul 23, 13:35 UTCJul 23, 16:00 UTC2h 25m
2026-07-23 SKW6466 IDA → DFW Jul 23, 13:24 UTCJul 23, 15:40 UTC2h 16m
2026-07-23 SKW6467 DFW → IDA Jul 23, 01:30 UTCJul 23, 03:40 UTC2h 10m
2026-07-22 SKW6191 BNA → ORD Jul 22, 22:20 UTCJul 22, 23:25 UTC1h 5m
2026-07-22 SKW6191 BNA → ORD Jul 22, 20:15 UTCJul 22, 21:15 UTC1h 0m
2026-07-22 SKW4984 GJT → ORD Jul 22, 17:30 UTCJul 22, 19:00 UTC1h 30m
2026-07-22 SKW4984 GJT → ORD Jul 22, 17:35 UTCJul 22, 18:59 UTC1h 24m
2026-07-22 SKW4984 GJT → ORD Jul 22, 15:10 UTCJul 22, 16:25 UTC1h 15m
2026-07-22 SKW6329 - Jul 22, 11:10 UTCJul 22, 11:50 UTC40m
2026-07-22 SKW6313 DFW → BPT Jul 22, 02:40 UTCJul 22, 03:20 UTC40m
2026-07-22 SKW6437 ASE → ORD Jul 22, 00:20 UTCJul 22, 01:05 UTC45m
2026-07-21 SKW6437 ASE → ORD Jul 21, 23:59 UTCJul 22, 00:56 UTC57m
2026-07-21 SKW6437 ASE → ORD Jul 21, 22:15 UTCJul 21, 23:00 UTC45m
2026-07-21 SKW4965 LCH → DFW Jul 21, 19:10 UTCJul 21, 20:45 UTC1h 35m
2026-07-21 SKW4965 LCH → DFW Jul 21, 16:35 UTCJul 21, 17:50 UTC1h 15m
2026-07-21 SKW6414 SLC → ORD Jul 21, 13:00 UTCJul 21, 14:35 UTC1h 35m
2026-07-21 SKW6442 ORD → ASE Jul 21, 02:45 UTCJul 21, 04:05 UTC1h 20m
2026-07-20 SKW6233 STL → ORD Jul 20, 23:10 UTCJul 21, 01:00 UTC1h 50m
2026-07-20 SKW6233 STL → ORD Jul 20, 19:55 UTCJul 20, 21:55 UTC2h 0m
2026-07-20 SKW4959 - Jul 20, 17:50 UTCJul 20, 18:25 UTC35m
2026-07-20 SKW4959 - Jul 20, 16:20 UTCJul 20, 16:45 UTC25m
2026-07-20 SKW6340 OKC → DFW Jul 20, 13:45 UTCJul 20, 14:25 UTC40m
2026-07-20 SKW6340 OKC → DFW Jul 20, 13:29 UTCJul 20, 14:34 UTC1h 5m
2026-07-20 SKW6284 LAX → SFO Jul 20, 03:20 UTCJul 20, 03:50 UTC30m
2026-07-20 SKW6284 LAX → SFO Jul 20, 03:17 UTCJul 20, 03:49 UTC32m
2026-07-20 SKW4923 DSM → ORD Jul 20, 01:20 UTCJul 20, 02:10 UTC50m
2026-07-20 SKW4923 DSM → ORD Jul 20, 01:16 UTCJul 20, 02:05 UTC49m
2026-07-19 SKW4923 DSM → ORD Jul 19, 23:05 UTCJul 19, 23:55 UTC50m
2026-07-19 SKW6256 - Jul 19, 20:50 UTCJul 19, 21:45 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 N720EV page for operator, model, and routing details .

Mode-S A9A404 frequently asked

What is Mode-S code A9A404?
A9A404 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N720EV.
Where is Mode-S A9A404 registered?
Mode-S code A9A404 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 A9A404 broadcasting right now?
Yes. Mode-S A9A404 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9A404, octal 52322004, decimal 11,117,572.
What flights does A9A404 operate?
Mode-S A9A404 has broadcast 20 distinct callsigns, including SKW6311, SKW6365, SKW6321, SKW6428, SKW4949.