Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A99DF4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N719EV · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A99DF4
Octal
52316764
Decimal
11,116,020
Country
US
Tail
N719EV
Type
CRJ7
No current signal · last broadcast Jul 26, 22:40 UTC
Flights observed
590
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:40 UTC

Last known position

Most recent position reported by Mode-S A99DF4.

Country allocation

The ICAO 24-bit address A99DF4 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
SKW4245 SkyWest Airlines 37 2026-07-26
SKW4262 SkyWest Airlines 35 2026-07-23
SKW4283 SkyWest Airlines 29 2026-07-26
SKW4273 SkyWest Airlines 26 2026-07-25
SKW4329 SkyWest Airlines 25 2026-07-21
SKW4332 SkyWest Airlines 21 2026-07-24
SKW4305 - 21 2026-07-17
SKW4331 SkyWest Airlines 18 2026-07-26
SKW4328 SkyWest Airlines 18 2026-07-24
SKW4284 SkyWest Airlines 18 2026-07-24
SKW4298 SkyWest Airlines 17 2026-07-25
SKW4242 - 16 2026-07-12
SKW4231 - 16 2026-07-12
SKW4299 SkyWest Airlines 15 2026-07-24
SKW4288 - 15 2026-07-14
SKW4229 - 15 2026-07-07
SKW4290 - 14 2026-07-14
SKW4238 - 14 2026-07-22
SKW4264 SkyWest Airlines 13 2026-07-21
SKW4330 - 12 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4331 MSP → GFK Jul 26, 21:55 UTCJul 26, 22:40 UTC45m
2026-07-26 SKW4283 BJI → MSP Jul 26, 20:05 UTCJul 26, 20:30 UTC25m
2026-07-26 SKW4283 BJI → MSP Jul 26, 18:20 UTCJul 26, 18:50 UTC30m
2026-07-26 SKW4245 INL → MSP Jul 26, 16:30 UTCJul 26, 17:00 UTC30m
2026-07-26 SKW4245 INL → MSP Jul 26, 14:35 UTCJul 26, 15:10 UTC35m
2026-07-26 SKW4336 BRD → MSP Jul 26, 12:00 UTCJul 26, 12:25 UTC25m
2026-07-25 SKW4301 BRD → MSP Jul 25, 23:05 UTCJul 25, 23:30 UTC25m
2026-07-25 SKW4301 BRD → MSP Jul 25, 23:16 UTCJul 25, 23:30 UTC14m
2026-07-25 SKW4283 BJI → MSP Jul 25, 20:00 UTCJul 25, 20:35 UTC35m
2026-07-25 SKW4283 BJI → MSP Jul 25, 18:25 UTCJul 25, 18:55 UTC30m
2026-07-25 SKW4273 MSP → BRD Jul 25, 17:05 UTCJul 25, 17:30 UTC25m
2026-07-25 SKW4273 MSP → BRD Jul 25, 14:25 UTCJul 25, 14:50 UTC25m
2026-07-25 SKW4298 ATY → MSP Jul 25, 12:05 UTCJul 25, 12:35 UTC30m
2026-07-24 SKW4299 ABR → MSP Jul 24, 23:25 UTCJul 24, 23:50 UTC25m
2026-07-24 SKW4299 ABR → MSP Jul 24, 23:37 UTCJul 24, 23:59 UTC22m
2026-07-24 SKW4284 XWA → MSP Jul 24, 21:09 UTCJul 24, 22:14 UTC1h 5m
2026-07-24 SKW4284 XWA → MSP Jul 24, 18:35 UTCJul 24, 19:45 UTC1h 10m
2026-07-24 SKW4273 MSP → BRD Jul 24, 16:30 UTCJul 24, 16:50 UTC20m
2026-07-24 SKW4273 MSP → BRD Jul 24, 15:00 UTCJul 24, 15:20 UTC20m
2026-07-24 SKW4303 BJI → MSP Jul 24, 13:40 UTCJul 24, 14:10 UTC30m
2026-07-24 SKW125H ATL → CHA Jul 24, 12:10 UTCJul 24, 12:40 UTC30m
2026-07-24 SKW4328 GFK → MSP Jul 24, 10:30 UTCJul 24, 11:15 UTC45m
2026-07-24 SKW4332 MSP → BJI Jul 24, 02:55 UTCJul 24, 03:35 UTC40m
2026-07-24 SKW4331 MSP → GFK Jul 24, 00:15 UTCJul 24, 01:00 UTC45m
2026-07-24 SKW4331 MSP → GFK Jul 24, 00:19 UTCJul 24, 00:55 UTC36m
2026-07-23 SKW4331 MSP → GFK Jul 23, 21:55 UTCJul 23, 22:40 UTC45m
2026-07-23 SKW4262 MSP → ABR Jul 23, 20:05 UTCJul 23, 20:45 UTC40m
2026-07-23 SKW4262 MSP → ABR Jul 23, 18:15 UTCJul 23, 19:00 UTC45m
2026-07-23 SKW4273 MSP → BRD Jul 23, 16:20 UTCJul 23, 16:40 UTC20m
2026-07-23 SKW4273 MSP → BRD Jul 23, 14:45 UTCJul 23, 15:10 UTC25m
2026-07-23 SKW4336 BRD → MSP Jul 23, 12:05 UTCJul 23, 12:30 UTC25m
2026-07-23 SKW4336 BRD → MSP Jul 23, 12:00 UTCJul 23, 12:24 UTC24m
2026-07-22 SKW4301 BRD → MSP Jul 22, 23:10 UTCJul 22, 23:35 UTC25m
2026-07-22 SKW4283 - Jul 22, 20:05 UTCJul 22, 20:40 UTC35m
2026-07-22 SKW4283 - Jul 22, 18:10 UTCJul 22, 18:35 UTC25m
2026-07-22 SKW4245 INL → MSP Jul 22, 16:20 UTCJul 22, 16:55 UTC35m
2026-07-22 SKW4245 INL → MSP Jul 22, 14:15 UTCJul 22, 14:40 UTC25m
2026-07-22 SKW4238 - Jul 22, 11:45 UTCJul 22, 12:30 UTC45m
2026-07-21 SKW4264 MSP → ABR Jul 21, 23:45 UTCJul 22, 00:17 UTC32m
2026-07-21 SKW4264 MSP → ABR Jul 21, 23:35 UTCJul 22, 00:15 UTC40m
2026-07-21 SKW4283 - Jul 21, 20:10 UTCJul 21, 20:35 UTC25m
2026-07-21 SKW4283 - Jul 21, 18:10 UTCJul 21, 18:45 UTC35m
2026-07-21 SKW4329 MSP → GFK Jul 21, 16:05 UTCJul 21, 16:50 UTC45m
2026-07-21 SKW4329 MSP → GFK Jul 21, 14:05 UTCJul 21, 14:45 UTC40m
2026-07-21 SKW4328 - Jul 21, 10:10 UTCJul 21, 11:00 UTC50m
2026-07-21 SKW4332 MSP → BJI Jul 21, 03:00 UTCJul 21, 03:45 UTC45m
2026-07-21 SKW4332 MSP → BJI Jul 21, 03:13 UTCJul 21, 03:50 UTC37m
2026-07-21 SKW4331 MSP → GFK Jul 21, 00:20 UTCJul 21, 01:15 UTC55m
2026-07-20 SKW4331 MSP → GFK Jul 20, 22:20 UTCJul 20, 23:00 UTC40m
2026-07-20 SKW4283 - Jul 20, 19:55 UTCJul 20, 20:30 UTC35m

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 N719EV page for operator, model, and routing details .

Mode-S A99DF4 frequently asked

What is Mode-S code A99DF4?
A99DF4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N719EV.
Where is Mode-S A99DF4 registered?
Mode-S code A99DF4 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 A99DF4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A99DF4, octal 52316764, decimal 11,116,020.
What flights does A99DF4 operate?
Mode-S A99DF4 has broadcast 20 distinct callsigns, including SKW4245, SKW4262, SKW4283, SKW4273, SKW4329.