Apparatus

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sensors Mode-S transponder

AB161B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N813SK · BOMBARDIER Regional Jet CRJ-900 · operated by SKYWEST AIRLINES INC

Hex
AB161B
Octal
52613033
Decimal
11,212,315
Country
US
Tail
N813SK
Type
CRJ9
No current signal · last broadcast Jul 26, 21:55 UTC
Flights observed
110
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:55 UTC

Last known position

Most recent position reported by Mode-S AB161B.

Country allocation

The ICAO 24-bit address AB161B 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
SKW3961 SkyWest Airlines 8 2026-07-20
SKW3860 - 7 2026-07-20
SKW3869 - 5 2026-07-14
SKW4123 SkyWest Airlines 4 2026-07-24
SKW3877 - 4 2026-07-19
SKW3697 - 4 2026-07-19
SKW3651 SkyWest Airlines 4 2026-07-24
SKW4055 SkyWest Airlines 3 2026-07-07
SKW3785 - 3 2026-07-22
SKW3685 - 3 2026-07-08
SKW3639 - 3 2026-07-14
SKW4612 SkyWest Airlines 2 2026-07-23
SKW4440 - 2 2026-07-09
SKW4313 - 2 2026-07-20
SKW4297 SkyWest Airlines 2 2026-07-20
SKW4159 SkyWest Airlines 2 2026-07-25
SKW4110 SkyWest Airlines 2 2026-07-21
SKW3986 - 2 2026-07-21
SKW3984 - 2 2026-07-15
SKW3919 - 2 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4007 PIT → JFK Jul 26, 20:40 UTCJul 26, 21:55 UTC1h 15m
2026-07-26 SKW3559 PIT → MSP Jul 26, 18:30 UTCJul 26, 18:55 UTC25m
2026-07-26 SKW3559 PIT → MSP Jul 26, 17:00 UTCJul 26, 17:25 UTC25m
2026-07-26 SKW3821 PHL → DTW Jul 26, 14:45 UTCJul 26, 15:45 UTC1h 0m
2026-07-26 SKW3821 PHL → DTW Jul 26, 12:40 UTCJul 26, 13:30 UTC50m
2026-07-25 SKW4608 SBN → ATL Jul 25, 21:10 UTCJul 25, 21:55 UTC45m
2026-07-25 SKW4159 DTW → ATW Jul 25, 02:15 UTCJul 25, 03:05 UTC50m
2026-07-24 SKW3651 YYZ → LGA Jul 24, 23:20 UTCJul 25, 01:00 UTC1h 40m
2026-07-24 SKW3651 YYZ → LGA Jul 24, 20:00 UTCJul 24, 21:45 UTC1h 45m
2026-07-24 SKW3533 SLC → SJC Jul 24, 17:55 UTCJul 24, 18:50 UTC55m
2026-07-24 SKW3533 SLC → SJC Jul 24, 15:50 UTCJul 24, 16:35 UTC45m
2026-07-24 SKW4123 SJC → LAX Jul 24, 13:35 UTCJul 24, 14:30 UTC55m
2026-07-24 SKW4123 SJC → LAX Jul 24, 11:25 UTCJul 24, 12:10 UTC45m
2026-07-23 SKW4034 CLE → BOS Jul 23, 23:50 UTCJul 24, 00:25 UTC35m
2026-07-23 SKW4612 SBN → ATL Jul 23, 22:35 UTCJul 23, 23:00 UTC25m
2026-07-23 SKW4182 MSP → LGA Jul 23, 18:15 UTCJul 23, 19:25 UTC1h 10m
2026-07-22 SKW3785 - Jul 22, 19:05 UTCJul 22, 20:10 UTC1h 5m
2026-07-22 SKW3673 ABQ → SLC Jul 22, 16:45 UTCJul 22, 17:25 UTC40m
2026-07-22 SKW3673 ABQ → SLC Jul 22, 14:35 UTCJul 22, 15:35 UTC1h 0m
2026-07-22 SKW3837 SBN → DTW Jul 22, 12:45 UTCJul 22, 13:15 UTC30m
2026-07-22 SKW3900 SJC → SEA Jul 22, 01:25 UTCJul 22, 01:55 UTC30m
2026-07-21 SKW3785 - Jul 21, 22:40 UTCJul 22, 00:00 UTC1h 20m
2026-07-21 SKW3785 - Jul 21, 18:55 UTCJul 21, 20:05 UTC1h 10m
2026-07-21 SKW3986 - Jul 21, 15:55 UTCJul 21, 16:25 UTC30m
2026-07-21 SKW3986 DTW → AZO Jul 21, 14:30 UTCJul 21, 15:00 UTC30m
2026-07-21 SKW4110 OAK → LAX Jul 21, 11:45 UTCJul 21, 13:15 UTC1h 30m
2026-07-21 SKW4110 OAK → LAX Jul 21, 11:49 UTCJul 21, 13:04 UTC1h 15m
2026-07-21 SKW3715 ORD → JFK Jul 21, 00:15 UTCJul 21, 02:00 UTC1h 45m
2026-07-20 SKW3860 - Jul 20, 22:00 UTCJul 20, 22:50 UTC50m
2026-07-20 SKW3860 - Jul 20, 19:55 UTCJul 20, 20:35 UTC40m
2026-07-20 SKW3961 BOS → MKE Jul 20, 17:10 UTCJul 20, 18:35 UTC1h 25m
2026-07-20 SKW3961 BOS → MKE Jul 20, 17:05 UTCJul 20, 18:35 UTC1h 30m
2026-07-20 SKW3961 BOS → MKE Jul 20, 14:30 UTCJul 20, 15:55 UTC1h 25m
2026-07-20 SKW4313 - Jul 20, 11:40 UTCJul 20, 12:20 UTC40m
2026-07-20 SKW4313 MQT → DTW Jul 20, 11:42 UTCJul 20, 12:20 UTC38m
2026-07-20 SKW4297 DTW → MQT Jul 20, 02:05 UTCJul 20, 02:50 UTC45m
2026-07-20 SKW4297 DTW → MQT Jul 20, 01:55 UTCJul 20, 03:01 UTC1h 6m
2026-07-19 SKW3877 - Jul 19, 22:20 UTCJul 19, 23:20 UTC1h 0m
2026-07-19 SKW3877 - Jul 19, 20:20 UTCJul 19, 21:10 UTC50m
2026-07-19 SKW3879 - Jul 19, 18:30 UTCJul 19, 19:10 UTC40m
2026-07-19 SKW3879 - Jul 19, 16:35 UTCJul 19, 17:15 UTC40m
2026-07-19 SKW3697 - Jul 19, 13:45 UTCJul 19, 15:05 UTC1h 20m
2026-07-19 SKW3697 - Jul 19, 11:30 UTCJul 19, 12:35 UTC1h 5m
2026-07-19 SKW3980 - Jul 19, 09:40 UTCJul 19, 10:05 UTC25m
2026-07-19 SKW3909 DTW → AZO Jul 19, 02:00 UTCJul 19, 02:30 UTC30m
2026-07-18 SKW3919 - Jul 18, 22:45 UTCJul 18, 23:10 UTC25m
2026-07-18 SKW3919 DTW → AZO Jul 18, 21:25 UTCJul 18, 21:55 UTC30m
2026-07-18 SKW3752 - Jul 18, 18:30 UTCJul 18, 18:55 UTC25m
2026-07-18 SKW3752 - Jul 18, 17:00 UTCJul 18, 17:15 UTC15m
2026-07-18 SKW3671 - Jul 18, 15:15 UTCJul 18, 16:00 UTC45m

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 N813SK page for operator, model, and routing details .

Mode-S AB161B frequently asked

What is Mode-S code AB161B?
AB161B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N813SK.
Where is Mode-S AB161B registered?
Mode-S code AB161B 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 AB161B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB161B, octal 52613033, decimal 11,212,315.
What flights does AB161B operate?
Mode-S AB161B has broadcast 20 distinct callsigns, including SKW3961, SKW3860, SKW3869, SKW4123, SKW3877.