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sensors Mode-S transponder

AB73F5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N837SK · BOMBARDIER Regional Jet CRJ-900 · operated by BANK OF UTAH TRUSTEE

Hex
AB73F5
Octal
52671765
Decimal
11,236,341
Country
US
Tail
N837SK
Type
CRJ9
No current signal · last broadcast Jul 23, 18:05 UTC
Flights observed
747
Distinct callsigns
20
Country
US
Last broadcast
Jul 23, 18:05 UTC

Last known position

Most recent position reported by Mode-S AB73F5.

Country allocation

The ICAO 24-bit address AB73F5 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
SKW3869 - 25 2026-07-16
SKW3500 - 25 2026-07-13
SKW3889 - 24 2026-07-15
SKW4059 SkyWest Airlines 20 2026-07-20
SKW4166 SkyWest Airlines 18 2026-07-20
SKW3559 SkyWest Airlines 17 2026-07-22
SKW3879 - 15 2026-07-07
SKW3994 SkyWest Airlines 14 2026-06-02
SKW3752 - 14 2026-07-15
SKW3639 - 14 2026-07-16
SKW3949 SkyWest Airlines 13 2026-07-22
SKW3877 - 13 2026-07-09
SKW3821 SkyWest Airlines 13 2026-07-22
SKW3671 - 13 2026-07-21
SKW4440 - 11 2026-07-10
SKW3581 - 11 2026-07-20
SKW3957 SkyWest Airlines 10 2026-05-23
SKW3900 - 10 2026-07-18
SKW3858 SkyWest Airlines 10 2026-07-22
SKW3675 - 10 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 SKW4034 CLE → BOS Jul 23, 17:40 UTCJul 23, 18:05 UTC25m
2026-07-23 SKW3898 IAD → MSP Jul 23, 15:50 UTCJul 23, 16:20 UTC30m
2026-07-23 SKW3898 IAD → MSP Jul 23, 14:25 UTCJul 23, 14:45 UTC20m
2026-07-23 SKW4110 OAK → LAX Jul 23, 11:30 UTCJul 23, 13:00 UTC1h 30m
2026-07-22 SKW3715 ORD → JFK Jul 22, 23:55 UTCJul 23, 01:35 UTC1h 40m
2026-07-22 SKW3919 MDW → MSP Jul 22, 22:10 UTCJul 22, 22:35 UTC25m
2026-07-22 SKW3919 MDW → MSP Jul 22, 20:30 UTCJul 22, 20:55 UTC25m
2026-07-22 SKW3559 PIT → MSP Jul 22, 18:35 UTCJul 22, 18:55 UTC20m
2026-07-22 SKW3559 PIT → MSP Jul 22, 16:55 UTCJul 22, 17:15 UTC20m
2026-07-22 SKW3821 PHL → DTW Jul 22, 14:50 UTCJul 22, 15:40 UTC50m
2026-07-22 SKW3821 PHL → DTW Jul 22, 12:45 UTCJul 22, 13:35 UTC50m
2026-07-22 SKW3858 DTW → OMA Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 SKW3949 LGA → BNA Jul 22, 02:05 UTCJul 22, 02:45 UTC40m
2026-07-21 SKW3782 SMF → LAX Jul 21, 22:55 UTCJul 21, 23:30 UTC35m
2026-07-21 SKW3782 SMF → LAX Jul 21, 21:15 UTCJul 21, 21:45 UTC30m
2026-07-21 SKW4034 CLE → BOS Jul 21, 19:15 UTCJul 21, 19:45 UTC30m
2026-07-21 SKW4034 CLE → BOS Jul 21, 19:22 UTCJul 21, 19:41 UTC19m
2026-07-21 SKW4034 CLE → BOS Jul 21, 17:40 UTCJul 21, 18:10 UTC30m
2026-07-21 SKW3671 - Jul 21, 14:40 UTCJul 21, 15:25 UTC45m
2026-07-21 SKW3671 - Jul 21, 13:00 UTCJul 21, 13:55 UTC55m
2026-07-21 SKW4060 - Jul 21, 09:30 UTCJul 21, 09:50 UTC20m
2026-07-21 SKW3684 - Jul 21, 03:25 UTCJul 21, 03:40 UTC15m
2026-07-21 SKW3684 DTW → LAN Jul 21, 03:19 UTCJul 21, 03:44 UTC25m
2026-07-20 SKW4166 ATW → DTW Jul 20, 23:30 UTCJul 21, 00:15 UTC44m
2026-07-20 SKW4166 ATW → DTW Jul 20, 21:35 UTCJul 20, 22:35 UTC1h 0m
2026-07-20 SKW3581 - Jul 20, 20:10 UTCJul 20, 20:35 UTC25m
2026-07-20 SKW3581 - Jul 20, 18:25 UTCJul 20, 18:50 UTC25m
2026-07-20 SKW4059 DTW → HPN Jul 20, 16:10 UTCJul 20, 16:55 UTC45m
2026-07-20 SKW4059 DTW → HPN Jul 20, 14:15 UTCJul 20, 15:10 UTC55m
2026-07-20 SKW3885 ATL → FWA Jul 20, 12:25 UTCJul 20, 12:50 UTC25m
2026-07-20 SKW4081 - Jul 20, 00:20 UTCJul 20, 00:45 UTC25m
2026-07-19 SKW3919 - Jul 19, 22:30 UTCJul 19, 23:05 UTC35m
2026-07-19 SKW3919 - Jul 19, 21:05 UTCJul 19, 21:30 UTC25m
2026-07-19 SKW3559 - Jul 19, 18:30 UTCJul 19, 18:55 UTC25m
2026-07-19 SKW3559 - Jul 19, 17:00 UTCJul 19, 17:20 UTC20m
2026-07-19 SKW3821 - Jul 19, 14:45 UTCJul 19, 15:40 UTC55m
2026-07-19 SKW3821 SDF → DTW Jul 19, 14:54 UTCJul 19, 15:35 UTC41m
2026-07-19 SKW3821 - Jul 19, 12:45 UTCJul 19, 13:35 UTC50m
2026-07-19 SKW3787 SLC → OAK Jul 19, 01:35 UTCJul 19, 02:40 UTC1h 5m
2026-07-19 SKW3787 SLC → OAK Jul 19, 01:30 UTCJul 19, 02:33 UTC1h 3m
2026-07-18 SKW3787 SLC → OAK Jul 18, 23:10 UTCJul 19, 00:15 UTC1h 5m
2026-07-18 SKW3711 IAD → DTW Jul 18, 17:20 UTCJul 18, 18:25 UTC1h 5m
2026-07-18 SKW3711 - Jul 18, 14:35 UTCJul 18, 15:40 UTC1h 5m
2026-07-18 SKW3837 - Jul 18, 12:45 UTCJul 18, 13:15 UTC30m
2026-07-18 SKW3900 - Jul 18, 00:10 UTCJul 18, 00:45 UTC35m
2026-07-17 SKW3785 - Jul 17, 21:44 UTCJul 17, 23:00 UTC1h 15m
2026-07-17 SKW3785 ALB → DTW Jul 17, 21:46 UTCJul 17, 22:59 UTC1h 13m
2026-07-17 SKW3785 - Jul 17, 19:45 UTCJul 17, 20:50 UTC1h 5m
2026-07-17 SKW3673 ABQ → SLC Jul 17, 17:15 UTCJul 17, 18:00 UTC45m
2026-07-17 SKW3673 ABQ → SLC Jul 17, 17:01 UTCJul 17, 17:59 UTC58m

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 N837SK page for operator, model, and routing details .

Mode-S AB73F5 frequently asked

What is Mode-S code AB73F5?
AB73F5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N837SK.
Where is Mode-S AB73F5 registered?
Mode-S code AB73F5 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 AB73F5 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 18:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB73F5, octal 52671765, decimal 11,236,341.
What flights does AB73F5 operate?
Mode-S AB73F5 has broadcast 20 distinct callsigns, including SKW3869, SKW3500, SKW3889, SKW4059, SKW4166.