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sensors Mode-S transponder

AAF253

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N804SK · BOMBARDIER Regional Jet CRJ-900 · operated by SKYWEST AIRLINES INC

Hex
AAF253
Octal
52571123
Decimal
11,203,155
Country
US
Tail
N804SK
Type
CRJ9
Broadcasting now · callsign SKW3843 · 24,100 ft
Flights observed
506
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

AAF253 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AAF253 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
SKW4456 SkyWest Airlines 10 2026-06-16
SKW3538 - 10 2026-07-13
SKW4130 - 9 2026-07-12
SKW3978 SkyWest Airlines 9 2026-06-09
SKW3941 SkyWest Airlines 9 2026-06-01
SKW3868 - 9 2026-07-13
SKW4140 - 8 2026-07-13
SKW4136 SkyWest Airlines 8 2026-06-24
SKW4032 - 8 2026-07-11
SKW3719 SkyWest Airlines 8 2026-06-03
SKW4080 - 7 2026-06-23
SKW4044 SkyWest Airlines 7 2026-05-26
SKW3831 - 7 2026-07-10
SKW3829 - 7 2026-06-23
SKW4144 - 6 2026-07-12
SKW4003 - 6 2026-07-13
SKW3995 SkyWest Airlines 6 2026-05-15
SKW3921 SkyWest Airlines 6 2026-05-31
SKW3920 SkyWest Airlines 6 2026-05-12
SKW3886 - 6 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW3666 - Jul 14, 17:05 UTCJul 14, 17:45 UTC40m
2026-07-14 SKW3666 - Jul 14, 15:15 UTCJul 14, 15:35 UTC20m
2026-07-14 SKW3542 - Jul 14, 12:40 UTCJul 14, 13:55 UTC1h 15m
2026-07-14 SKW3541 MSP → ICT Jul 14, 01:35 UTCJul 14, 02:45 UTC1h 10m
2026-07-13 SKW3538 FSD → MSP Jul 13, 22:01 UTCJul 13, 22:40 UTC39m
2026-07-13 SKW3538 FSD → MSP Jul 13, 22:05 UTCJul 13, 22:40 UTC35m
2026-07-13 SKW3538 MSP → FSD Jul 13, 19:55 UTCJul 13, 20:30 UTC35m
2026-07-13 SKW149R YYZ → MSP Jul 13, 16:35 UTCJul 13, 18:10 UTC1h 35m
2026-07-13 SKW3868 - Jul 13, 14:40 UTCJul 13, 15:15 UTC35m
2026-07-13 SKW3868 - Jul 13, 13:35 UTCJul 13, 14:35 UTC1h 0m
2026-07-13 SKW4140 - Jul 13, 11:15 UTCJul 13, 11:55 UTC40m
2026-07-13 SKW4003 - Jul 13, 01:50 UTCJul 13, 02:30 UTC40m
2026-07-12 SKW4130 - Jul 12, 23:00 UTCJul 13, 00:01 UTC1h 0m
2026-07-12 SKW4130 - Jul 12, 20:20 UTCJul 12, 21:30 UTC1h 10m
2026-07-12 SKW4144 - Jul 12, 17:45 UTCJul 12, 18:45 UTC1h 0m
2026-07-12 SKW4144 MOT → MSP Jul 12, 17:51 UTCJul 12, 18:45 UTC54m
2026-07-12 SKW4144 - Jul 12, 15:30 UTCJul 12, 16:25 UTC55m
2026-07-12 SKW3512 - Jul 12, 13:15 UTCJul 12, 14:01 UTC45m
2026-07-11 SKW3838 - Jul 11, 21:50 UTCJul 11, 22:35 UTC45m
2026-07-11 SKW4032 - Jul 11, 20:00 UTCJul 11, 20:45 UTC45m
2026-07-11 SKW4032 - Jul 11, 18:20 UTCJul 11, 19:00 UTC40m
2026-07-11 SKW4090 - Jul 11, 16:15 UTCJul 11, 17:10 UTC55m
2026-07-11 SKW4090 - Jul 11, 14:15 UTCJul 11, 14:55 UTC40m
2026-07-11 SKW4073 YYZ → MSP Jul 11, 10:50 UTCJul 11, 12:30 UTC1h 40m
2026-07-11 SKW125R MSP → YYZ Jul 11, 01:25 UTCJul 11, 03:01 UTC1h 35m
2026-07-10 SKW3967 - Jul 10, 20:50 UTCJul 10, 21:50 UTC1h 0m
2026-07-10 SKW3967 - Jul 10, 18:05 UTCJul 10, 19:10 UTC1h 5m
2026-07-10 SKW3831 - Jul 10, 16:05 UTCJul 10, 16:50 UTC45m
2026-07-10 SKW3831 MSP → OMA Jul 10, 14:15 UTCJul 10, 15:05 UTC50m
2026-07-10 SKW4460 - Jul 10, 12:20 UTCJul 10, 13:10 UTC50m
2026-07-09 SKW4620 - Jul 9, 19:25 UTCJul 9, 20:20 UTC55m
2026-07-09 SKW4626 - Jul 9, 17:20 UTCJul 9, 18:05 UTC45m
2026-07-03 SKW4613 - Jul 3, 18:25 UTCJul 3, 19:55 UTC1h 30m
2026-06-30 SKW4130 - Jun 30, 20:25 UTCJun 30, 21:15 UTC50m
2026-06-30 SKW149R YYZ → MSP Jun 30, 16:50 UTCJun 30, 18:25 UTC1h 35m
2026-06-30 SKW3868 MSP → YYZ Jun 30, 13:50 UTCJun 30, 15:25 UTC1h 35m
2026-06-30 SKW4140 GRB → MSP Jun 30, 11:20 UTCJun 30, 12:05 UTC45m
2026-06-30 SKW4003 MSP → GRB Jun 30, 02:10 UTCJun 30, 02:50 UTC40m
2026-06-25 SKW4464 MSP → SDF Jun 25, 23:55 UTCJun 26, 00:20 UTC25m
2026-06-25 SKW3534 ORD → BOS Jun 25, 19:09 UTCJun 25, 19:49 UTC40m
2026-06-25 SKW3534 ORD → BOS Jun 25, 17:14 UTCJun 25, 17:54 UTC40m
2026-06-25 SKW4466 MSP → MKE Jun 25, 15:04 UTCJun 25, 15:59 UTC55m
2026-06-25 SKW4466 MSP → MKE Jun 25, 15:09 UTCJun 25, 15:59 UTC50m
2026-06-25 SKW4466 MSP → MKE Jun 25, 13:14 UTCJun 25, 14:04 UTC50m
2026-06-25 SKW4158 - Jun 25, 10:15 UTCJun 25, 11:15 UTC1h 0m
2026-06-24 SKW4143 - Jun 24, 23:45 UTCJun 25, 00:49 UTC1h 5m
2026-06-24 SKW3538 ATL → LEX Jun 24, 22:04 UTCJun 24, 22:39 UTC35m
2026-06-24 SKW3538 ATL → LEX Jun 24, 20:24 UTCJun 24, 21:09 UTC45m
2026-06-24 SKW4144 - Jun 24, 18:15 UTCJun 24, 19:10 UTC55m
2026-06-24 SKW4144 MOT → MSP Jun 24, 18:07 UTCJun 24, 19:08 UTC1h 1m

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 N804SK page for operator, model, and routing details .

Mode-S AAF253 frequently asked

What is Mode-S code AAF253?
AAF253 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N804SK.
Where is Mode-S AAF253 registered?
Mode-S code AAF253 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 AAF253 broadcasting right now?
Yes. Mode-S AAF253 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAF253, octal 52571123, decimal 11,203,155.
What flights does AAF253 operate?
Mode-S AAF253 has broadcast 20 distinct callsigns, including SKW4456, SKW3538, SKW4130, SKW3978, SKW3941.