Apparatus

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sensors Mode-S transponder

A0F6B9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N161PQ · BOMBARDIER Regional Jet CRJ-900 · operated by DELTA AIR LINES INC

Hex
A0F6B9
Octal
50173271
Decimal
10,548,921
Country
US
Tail
N161PQ
Type
CRJ9
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
673
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A0F6B9.

Country allocation

The ICAO 24-bit address A0F6B9 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
SKW3995 - 19 2026-07-14
SKW3971 SkyWest Airlines 18 2026-07-25
SKW3823 SkyWest Airlines 17 2026-04-29
SKW4096 SkyWest Airlines 16 2026-05-03
SKW3500 SkyWest Airlines 15 2026-06-18
SKW4089 - 13 2026-07-17
SKW4066 SkyWest Airlines 11 2026-07-23
SKW3861 SkyWest Airlines 11 2026-07-23
SKW3760 SkyWest Airlines 11 2026-05-05
SKW3709 SkyWest Airlines 11 2026-07-20
SKW3595 SkyWest Airlines 11 2026-07-18
SKW4466 - 10 2026-07-20
SKW4140 - 10 2026-07-15
SKW3783 SkyWest Airlines 9 2026-07-26
SKW3719 SkyWest Airlines 9 2026-05-29
SKW3661 SkyWest Airlines 9 2026-04-29
SKW3984 SkyWest Airlines 8 2026-05-28
SKW3924 SkyWest Airlines 8 2026-06-03
SKW3666 SkyWest Airlines 8 2026-07-26
SKW3662 SkyWest Airlines 8 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3783 MSP → FWA Jul 26, 19:50 UTCJul 26, 21:45 UTC1h 55m
2026-07-26 SKW3666 DTW → MDW Jul 26, 17:00 UTCJul 26, 17:25 UTC25m
2026-07-26 SKW3666 DTW → MDW Jul 26, 15:25 UTCJul 26, 15:45 UTC20m
2026-07-26 SKW3542 SEA → SFO Jul 26, 12:40 UTCJul 26, 14:00 UTC1h 20m
2026-07-26 SKW3541 BNA → JFK Jul 26, 01:25 UTCJul 26, 02:35 UTC1h 10m
2026-07-25 SKW3538 ATL → LEX Jul 25, 21:35 UTCJul 25, 22:20 UTC45m
2026-07-25 SKW3538 ATL → LEX Jul 25, 21:35 UTCJul 25, 22:19 UTC44m
2026-07-25 SKW3538 ATL → LEX Jul 25, 19:50 UTCJul 25, 20:25 UTC35m
2026-07-25 SKW3971 DTW → MKE Jul 25, 17:20 UTCJul 25, 18:25 UTC1h 5m
2026-07-25 SKW3971 DTW → MKE Jul 25, 17:17 UTCJul 25, 18:10 UTC53m
2026-07-25 SKW3971 DTW → MKE Jul 25, 14:45 UTCJul 25, 15:50 UTC1h 5m
2026-07-25 SKW4073 DTW → HPN Jul 25, 10:50 UTCJul 25, 12:35 UTC1h 45m
2026-07-25 SKW125R SLC → YVR Jul 25, 01:20 UTCJul 25, 02:50 UTC1h 30m
2026-07-24 SKW3843 HPN → DTW Jul 24, 21:20 UTCJul 24, 22:10 UTC50m
2026-07-24 SKW3843 HPN → DTW Jul 24, 19:40 UTCJul 24, 20:20 UTC40m
2026-07-24 SKW3666 DTW → MDW Jul 24, 17:00 UTCJul 24, 17:30 UTC30m
2026-07-24 SKW3666 DTW → MDW Jul 24, 15:25 UTCJul 24, 15:50 UTC25m
2026-07-24 SKW3542 SEA → SFO Jul 24, 12:45 UTCJul 24, 14:15 UTC1h 30m
2026-07-24 SKW3541 BNA → JFK Jul 24, 01:35 UTCJul 24, 02:50 UTC1h 15m
2026-07-23 SKW3861 SLC → OMA Jul 23, 21:35 UTCJul 23, 22:30 UTC55m
2026-07-23 SKW3861 SLC → OMA Jul 23, 21:41 UTCJul 23, 22:25 UTC44m
2026-07-23 SKW3861 SLC → OMA Jul 23, 19:40 UTCJul 23, 20:20 UTC40m
2026-07-23 SKW4066 MSP → BIS Jul 23, 16:45 UTCJul 23, 17:35 UTC50m
2026-07-23 SKW4066 MSP → BIS Jul 23, 16:41 UTCJul 23, 17:30 UTC49m
2026-07-23 SKW4066 MSP → BIS Jul 23, 14:20 UTCJul 23, 15:15 UTC55m
2026-07-23 SKW3702 OMA → LGA Jul 23, 11:15 UTCJul 23, 12:35 UTC1h 20m
2026-07-23 SKW3780 CLT → DTW Jul 23, 01:15 UTCJul 23, 02:10 UTC55m
2026-07-22 SKW3851 LAX → SJC Jul 22, 22:30 UTCJul 22, 23:30 UTC1h 0m
2026-07-22 SKW3851 LAX → SJC Jul 22, 20:05 UTCJul 22, 21:05 UTC1h 0m
2026-07-22 SKW3971 DTW → MKE Jul 22, 17:35 UTCJul 22, 18:40 UTC1h 5m
2026-07-22 SKW3971 DTW → MKE Jul 22, 15:00 UTCJul 22, 16:05 UTC1h 5m
2026-07-22 SKW4073 DTW → HPN Jul 22, 11:10 UTCJul 22, 12:25 UTC1h 15m
2026-07-22 SKW125R SLC → YVR Jul 22, 01:15 UTCJul 22, 02:40 UTC1h 25m
2026-07-21 SKW3948 HPN → ATL Jul 21, 23:05 UTCJul 21, 23:55 UTC50m
2026-07-21 SKW3948 HPN → ATL Jul 21, 22:55 UTCJul 21, 23:45 UTC50m
2026-07-21 SKW188F MSP → OMA Jul 21, 20:45 UTCJul 21, 21:35 UTC50m
2026-07-21 SKW4144 BOS → JFK Jul 21, 17:50 UTCJul 21, 18:45 UTC55m
2026-07-21 SKW4144 BOS → JFK Jul 21, 15:20 UTCJul 21, 16:20 UTC1h 0m
2026-07-21 SKW3512 BOS → MKE Jul 21, 13:15 UTCJul 21, 14:05 UTC50m
2026-07-21 SKW3512 BOS → MKE Jul 21, 13:15 UTCJul 21, 14:04 UTC49m
2026-07-21 SKW4014 MSP → OMA Jul 21, 02:50 UTCJul 21, 03:40 UTC50m
2026-07-20 SKW3709 JFK → BNA Jul 20, 23:50 UTCJul 21, 01:40 UTC1h 50m
2026-07-20 SKW3709 JFK → BNA Jul 20, 21:00 UTCJul 20, 22:30 UTC1h 30m
2026-07-20 SKW3534 ORD → BOS Jul 20, 19:00 UTCJul 20, 19:40 UTC40m
2026-07-20 SKW3534 ORD → BOS Jul 20, 18:49 UTCJul 20, 19:36 UTC47m
2026-07-20 SKW3534 ORD → BOS Jul 20, 17:05 UTCJul 20, 17:50 UTC45m
2026-07-20 SKW4466 - Jul 20, 14:45 UTCJul 20, 15:35 UTC50m
2026-07-20 SKW4466 MSP → MKE Jul 20, 12:55 UTCJul 20, 13:50 UTC55m
2026-07-20 SKW4158 - Jul 20, 10:25 UTCJul 20, 11:15 UTC50m
2026-07-20 SKW4154 MSP → CMH Jul 20, 03:10 UTCJul 20, 04:25 UTC1h 15m

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 N161PQ page for operator, model, and routing details .

Mode-S A0F6B9 frequently asked

What is Mode-S code A0F6B9?
A0F6B9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N161PQ.
Where is Mode-S A0F6B9 registered?
Mode-S code A0F6B9 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 A0F6B9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0F6B9, octal 50173271, decimal 10,548,921.
What flights does A0F6B9 operate?
Mode-S A0F6B9 has broadcast 20 distinct callsigns, including SKW3995, SKW3971, SKW3823, SKW4096, SKW3500.