Apparatus

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sensors Mode-S transponder

AB2140

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N816SK · BOMBARDIER Regional Jet CRJ-900 · operated by SKYWEST AIRLINES INC

Hex
AB2140
Octal
52620500
Decimal
11,215,168
Country
US
Tail
N816SK
Type
CRJ9
No current signal · last broadcast Jul 26, 21:20 UTC
Flights observed
581
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:20 UTC

Last known position

Most recent position reported by Mode-S AB2140.

Country allocation

The ICAO 24-bit address AB2140 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
SKW4144 SkyWest Airlines 21 2026-07-26
SKW4089 - 14 2026-07-12
SKW3709 - 13 2026-07-19
SKW4158 - 12 2026-07-21
SKW4130 SkyWest Airlines 12 2026-07-26
SKW3861 - 12 2026-07-18
SKW4102 - 11 2026-07-18
SKW4080 SkyWest Airlines 11 2026-07-24
SKW3831 - 11 2026-06-16
SKW3829 SkyWest Airlines 10 2026-07-24
SKW3851 - 9 2026-07-14
SKW4014 SkyWest Airlines 8 2026-07-26
SKW3867 SkyWest Airlines 8 2026-06-03
SKW3835 - 8 2026-06-29
SKW3556 SkyWest Airlines 8 2026-07-25
SKW3534 SkyWest Airlines 8 2026-07-19
SKW3512 SkyWest Airlines 8 2026-07-26
SKW4466 - 7 2026-07-21
SKW4010 SkyWest Airlines 7 2026-06-01
SKW3843 - 7 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4130 PDX → SEA Jul 26, 20:20 UTCJul 26, 21:20 UTC1h 0m
2026-07-26 SKW4144 BOS → JFK Jul 26, 18:15 UTCJul 26, 19:15 UTC1h 0m
2026-07-26 SKW4144 BOS → JFK Jul 26, 18:16 UTCJul 26, 19:10 UTC54m
2026-07-26 SKW4144 BOS → JFK Jul 26, 16:00 UTCJul 26, 17:00 UTC1h 0m
2026-07-26 SKW3512 BOS → MKE Jul 26, 13:45 UTCJul 26, 14:30 UTC45m
2026-07-26 SKW3512 BOS → MKE Jul 26, 13:45 UTCJul 26, 14:30 UTC45m
2026-07-26 SKW4014 MKE → DTW Jul 26, 02:50 UTCJul 26, 03:35 UTC45m
2026-07-26 SKW4462 MSP → MKE Jul 26, 00:00 UTCJul 26, 00:55 UTC55m
2026-07-25 SKW4462 MSP → MKE Jul 25, 22:15 UTCJul 25, 23:00 UTC45m
2026-07-25 SKW3556 SJC → SLC Jul 25, 17:05 UTCJul 25, 17:55 UTC50m
2026-07-25 SKW3556 SJC → SLC Jul 25, 16:30 UTCJul 25, 17:00 UTC30m
2026-07-25 SKW3556 SJC → SLC Jul 25, 16:35 UTCJul 25, 17:51 UTC1h 16m
2026-07-25 SKW3556 SJC → SLC Jul 25, 14:15 UTCJul 25, 15:25 UTC1h 10m
2026-07-25 SKW4303 BJI → MSP Jul 25, 11:50 UTCJul 25, 12:15 UTC25m
2026-07-25 SKW4291 MSP → BJI Jul 25, 05:25 UTCJul 25, 05:50 UTC25m
2026-07-25 SKW4291 MSP → BJI Jul 25, 04:00 UTCJul 25, 04:30 UTC30m
2026-07-25 SKW4291 MSP → BJI Jul 25, 03:08 UTCJul 25, 03:40 UTC32m
2026-07-25 SKW4291 MSP → BJI Jul 25, 02:50 UTCJul 25, 04:00 UTC1h 10m
2026-07-24 SKW3829 DTW → CLE Jul 24, 23:35 UTCJul 25, 01:20 UTC1h 45m
2026-07-24 SKW4080 DTW → MDW Jul 24, 21:00 UTCJul 24, 22:30 UTC1h 30m
2026-07-24 SKW4144 BOS → JFK Jul 24, 18:55 UTCJul 24, 19:50 UTC55m
2026-07-24 SKW4144 BOS → JFK Jul 24, 18:58 UTCJul 24, 19:45 UTC47m
2026-07-24 SKW4144 BOS → JFK Jul 24, 16:35 UTCJul 24, 17:40 UTC1h 5m
2026-07-24 SKW3512 BOS → MKE Jul 24, 14:05 UTCJul 24, 14:50 UTC45m
2026-07-24 SKW3512 BOS → MKE Jul 24, 14:06 UTCJul 24, 14:49 UTC43m
2026-07-24 SKW4014 MKE → DTW Jul 24, 03:20 UTCJul 24, 04:05 UTC45m
2026-07-24 SKW4014 MKE → DTW Jul 24, 03:25 UTCJul 24, 04:04 UTC39m
2026-07-24 SKW3829 DTW → CLE Jul 24, 00:10 UTCJul 24, 02:00 UTC1h 50m
2026-07-23 SKW4080 DTW → MDW Jul 23, 21:28 UTCJul 23, 22:40 UTC1h 12m
2026-07-23 SKW4080 DTW → MDW Jul 23, 21:15 UTCJul 23, 22:50 UTC1h 35m
2026-07-23 SKW4144 BOS → JFK Jul 23, 19:20 UTCJul 23, 20:10 UTC50m
2026-07-23 SKW4144 BOS → JFK Jul 23, 16:35 UTCJul 23, 17:30 UTC55m
2026-07-23 SKW3922 - Jul 23, 13:40 UTCJul 23, 14:05 UTC25m
2026-07-23 SKW3912 ATL → MDT Jul 23, 01:33 UTCJul 23, 01:49 UTC16m
2026-07-23 SKW3912 ATL → MDT Jul 23, 01:25 UTCJul 23, 01:45 UTC20m
2026-07-22 SKW4167 MSP → RST Jul 22, 23:05 UTCJul 23, 00:20 UTC1h 15m
2026-07-22 SKW4167 MSP → RST Jul 22, 23:11 UTCJul 23, 00:15 UTC1h 4m
2026-07-22 SKW4167 MSP → RST Jul 22, 18:55 UTCJul 22, 19:55 UTC1h 0m
2026-07-22 SKW4066 - Jul 22, 16:35 UTCJul 22, 17:20 UTC45m
2026-07-22 SKW4066 - Jul 22, 14:15 UTCJul 22, 15:10 UTC55m
2026-07-22 SKW3702 OMA → LGA Jul 22, 11:20 UTCJul 22, 12:30 UTC1h 10m
2026-07-22 SKW3780 CLT → DTW Jul 22, 01:00 UTCJul 22, 01:55 UTC55m
2026-07-21 SKW3865 - Jul 21, 20:25 UTCJul 21, 21:30 UTC1h 5m
2026-07-21 SKW3865 GRR → MSP Jul 21, 20:24 UTCJul 21, 21:25 UTC1h 1m
2026-07-21 SKW3865 MSP → GRR Jul 21, 18:00 UTCJul 21, 19:00 UTC1h 0m
2026-07-21 SKW4466 - Jul 21, 14:50 UTCJul 21, 15:40 UTC50m
2026-07-21 SKW4466 MSP → MKE Jul 21, 12:45 UTCJul 21, 13:35 UTC50m
2026-07-21 SKW4158 - Jul 21, 10:30 UTCJul 21, 11:25 UTC55m
2026-07-21 SKW4154 MSP → CMH Jul 21, 03:10 UTCJul 21, 04:10 UTC1h 0m
2026-07-21 SKW3829 DTW → CLE Jul 21, 00:05 UTCJul 21, 01:55 UTC1h 50m

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 N816SK page for operator, model, and routing details .

Mode-S AB2140 frequently asked

What is Mode-S code AB2140?
AB2140 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N816SK.
Where is Mode-S AB2140 registered?
Mode-S code AB2140 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 AB2140 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB2140, octal 52620500, decimal 11,215,168.
What flights does AB2140 operate?
Mode-S AB2140 has broadcast 20 distinct callsigns, including SKW4144, SKW4089, SKW3709, SKW4158, SKW4130.