Apparatus

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sensors Mode-S transponder

A9BF27

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N727SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A9BF27
Octal
52337447
Decimal
11,124,519
Country
US
Tail
N727SK
Type
CRJ7
Broadcasting now · callsign SKW4941 · 11,825 ft
Flights observed
723
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Current position

A9BF27 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9BF27 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
SKW6228 - 17 2026-07-05
SKW6223 SkyWest Airlines 11 2026-07-26
SKW6362 - 10 2026-06-27
SKW4827 - 10 2026-07-05
SKW6232 - 9 2026-06-30
SKW4833 - 9 2026-07-05
SKW5012 - 8 2026-07-18
SKW4936 SkyWest Airlines 8 2026-06-09
SKW4887 SkyWest Airlines 8 2026-05-26
SKW6488 SkyWest Airlines 7 2026-07-25
SKW6433 SkyWest Airlines 7 2026-06-27
SKW6372 SkyWest Airlines 7 2026-07-19
SKW6367 SkyWest Airlines 7 2026-04-17
SKW6244 SkyWest Airlines 7 2026-07-23
SKW6219 SkyWest Airlines 7 2026-06-10
SKW4949 SkyWest Airlines 7 2026-07-24
SKW4910 - 7 2026-07-20
SKW4905 SkyWest Airlines 7 2026-07-20
SKW4830 - 7 2026-07-05
SKW6430 SkyWest Airlines 6 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5008 PSP → PHX Jul 26, 20:50 UTCJul 26, 21:40 UTC50m
2026-07-26 SKW5008 PSP → PHX Jul 26, 19:20 UTCJul 26, 20:05 UTC45m
2026-07-26 SKW5003 BRO → DFW Jul 26, 16:10 UTCJul 26, 17:45 UTC1h 35m
2026-07-26 SKW5003 BRO → DFW Jul 26, 16:09 UTCJul 26, 17:50 UTC1h 41m
2026-07-26 SKW5003 BRO → DFW Jul 26, 13:50 UTCJul 26, 14:55 UTC1h 5m
2026-07-26 SKW6223 SAT → LAX Jul 26, 10:15 UTCJul 26, 11:40 UTC1h 25m
2026-07-26 SKW6223 SAT → LAX Jul 26, 10:15 UTCJul 26, 11:25 UTC1h 10m
2026-07-26 SKW6222 LAX → SFO Jul 26, 03:15 UTCJul 26, 04:15 UTC1h 0m
2026-07-26 SKW6199 PSC → PHX Jul 26, 00:45 UTCJul 26, 01:50 UTC1h 5m
2026-07-25 SKW6199 PSC → PHX Jul 25, 22:25 UTCJul 25, 23:30 UTC1h 5m
2026-07-25 SKW6418 DFW → BRO Jul 25, 20:05 UTCJul 25, 20:35 UTC30m
2026-07-25 SKW6418 DFW → BRO Jul 25, 20:05 UTCJul 25, 20:20 UTC15m
2026-07-25 SKW6418 DFW → BRO Jul 25, 18:45 UTCJul 25, 19:10 UTC25m
2026-07-25 SKW6488 ORD → YYZ Jul 25, 15:45 UTCJul 25, 16:50 UTC1h 5m
2026-07-25 SKW6488 ORD → YYZ Jul 25, 15:42 UTCJul 25, 16:49 UTC1h 7m
2026-07-25 SKW6488 ORD → YYZ Jul 25, 13:30 UTCJul 25, 14:35 UTC1h 5m
2026-07-25 SKW4914 ORD → RIC Jul 25, 11:15 UTCJul 25, 11:45 UTC30m
2026-07-25 SKW4941 PHX → MRY Jul 25, 03:40 UTCJul 25, 04:00 UTC20m
2026-07-25 SKW6218 DTW → ORD Jul 25, 00:05 UTCJul 25, 02:15 UTC2h 10m
2026-07-25 SKW6218 DTW → ORD Jul 25, 00:00 UTCJul 25, 01:54 UTC1h 54m
2026-07-24 SKW6218 DTW → ORD Jul 24, 21:25 UTCJul 24, 23:10 UTC1h 45m
2026-07-24 SKW4949 ORD → PIA Jul 24, 19:00 UTCJul 24, 19:45 UTC45m
2026-07-24 SKW4949 ORD → PIA Jul 24, 18:59 UTCJul 24, 19:53 UTC54m
2026-07-24 SKW4949 ORD → PIA Jul 24, 17:20 UTCJul 24, 18:10 UTC50m
2026-07-24 SKW6209 MAF → DFW Jul 24, 13:30 UTCJul 24, 15:45 UTC2h 15m
2026-07-24 SKW6209 MAF → DFW Jul 24, 13:00 UTCJul 24, 15:24 UTC2h 24m
2026-07-24 SKW6210 DRO → DFW Jul 24, 00:35 UTCJul 24, 02:50 UTC2h 15m
2026-07-24 SKW6210 DRO → DFW Jul 24, 00:30 UTCJul 24, 02:56 UTC2h 26m
2026-07-23 SKW4913 PHX → YUM Jul 23, 21:10 UTCJul 23, 22:20 UTC1h 10m
2026-07-23 SKW4913 PHX → YUM Jul 23, 21:05 UTCJul 23, 22:19 UTC1h 14m
2026-07-23 SKW4913 PHX → YUM Jul 23, 18:45 UTCJul 23, 19:50 UTC1h 5m
2026-07-23 SKW6244 ORD → FSD Jul 23, 15:35 UTCJul 23, 16:30 UTC55m
2026-07-23 SKW6244 ORD → FSD Jul 23, 15:29 UTCJul 23, 16:20 UTC51m
2026-07-23 SKW6244 ORD → FSD Jul 23, 13:35 UTCJul 23, 14:25 UTC50m
2026-07-23 SKW6338 PHX → TUL Jul 23, 10:55 UTCJul 23, 11:40 UTC45m
2026-07-23 SKW6338 PHX → TUL Jul 23, 10:51 UTCJul 23, 11:37 UTC46m
2026-07-23 SKW6396 BNA → ORD Jul 23, 05:00 UTCJul 23, 05:45 UTC45m
2026-07-23 SKW6398 GJT → DFW Jul 23, 00:40 UTCJul 23, 02:35 UTC1h 55m
2026-07-22 SKW6398 GJT → DFW Jul 22, 22:20 UTCJul 22, 23:35 UTC1h 15m
2026-07-22 SKW6283 ICT → ORD Jul 22, 19:05 UTCJul 22, 20:25 UTC1h 20m
2026-07-22 SKW6226 PHX → IAH Jul 22, 16:25 UTCJul 22, 18:10 UTC1h 45m
2026-07-22 SKW4810 SGU → PHX Jul 22, 14:15 UTCJul 22, 15:00 UTC45m
2026-07-21 SKW4813 PHX → SGU Jul 21, 22:50 UTCJul 21, 23:30 UTC40m
2026-07-21 SKW6394 BFL → PHX Jul 21, 20:45 UTCJul 21, 21:50 UTC1h 5m
2026-07-21 SKW6394 BFL → PHX Jul 21, 20:40 UTCJul 21, 21:48 UTC1h 8m
2026-07-21 SKW6394 PHX → BFL Jul 21, 18:55 UTCJul 21, 19:55 UTC1h 0m
2026-07-21 SKW4889 ORD → BNA Jul 21, 16:35 UTCJul 21, 18:00 UTC1h 25m
2026-07-21 SKW9920 - Jul 21, 14:30 UTCJul 21, 15:45 UTC1h 15m
2026-07-20 SKW9916 - Jul 20, 20:20 UTCJul 20, 21:30 UTC1h 10m
2026-07-20 SKW6348 SMF → LAX Jul 20, 17:20 UTCJul 20, 18:30 UTC1h 10m

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 N727SK page for operator, model, and routing details .

Mode-S A9BF27 frequently asked

What is Mode-S code A9BF27?
A9BF27 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N727SK.
Where is Mode-S A9BF27 registered?
Mode-S code A9BF27 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 A9BF27 broadcasting right now?
Yes. Mode-S A9BF27 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9BF27, octal 52337447, decimal 11,124,519.
What flights does A9BF27 operate?
Mode-S A9BF27 has broadcast 20 distinct callsigns, including SKW6228, SKW6223, SKW6362, SKW4827, SKW6232.