Apparatus

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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 1h ago
Flights observed
670
Distinct callsigns
20
Country
US
Last broadcast
1h ago

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
SKW3500 - 25 2026-07-13
SKW3869 - 23 2026-07-02
SKW3889 - 21 2026-07-08
SKW4059 - 18 2026-06-28
SKW4166 - 16 2026-06-27
SKW3879 - 15 2026-07-07
SKW3994 SkyWest Airlines 14 2026-06-02
SKW3877 - 13 2026-07-09
SKW3559 - 13 2026-07-12
SKW3949 - 12 2026-07-14
SKW3639 - 12 2026-07-13
SKW4440 - 11 2026-07-10
SKW3752 - 11 2026-07-09
SKW3957 SkyWest Airlines 10 2026-05-23
SKW3675 - 10 2026-07-10
SKW3651 - 10 2026-07-13
SKW3784 SkyWest Airlines 9 2026-06-05
SKW3598 - 9 2026-07-14
SKW3581 - 9 2026-07-10
SKW4081 SkyWest Airlines 8 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW3949 - Jul 14, 02:55 UTCJul 14, 03:40 UTC45m
2026-07-14 SKW3598 - Jul 14, 00:15 UTCJul 14, 00:45 UTC30m
2026-07-13 SKW3598 - Jul 13, 22:50 UTCJul 13, 23:25 UTC35m
2026-07-13 SKW3762 - Jul 13, 20:10 UTCJul 13, 21:40 UTC1h 30m
2026-07-13 SKW3762 - Jul 13, 17:55 UTCJul 13, 19:15 UTC1h 20m
2026-07-13 SKW3500 GRR → DTW Jul 13, 16:30 UTCJul 13, 17:00 UTC30m
2026-07-13 SKW3500 - Jul 13, 15:10 UTCJul 13, 15:35 UTC25m
2026-07-13 SKW3639 - Jul 13, 13:05 UTCJul 13, 13:45 UTC40m
2026-07-13 SKW3639 DTW → BUF Jul 13, 11:25 UTCJul 13, 12:10 UTC45m
2026-07-13 SKW3980 - Jul 13, 09:40 UTCJul 13, 10:10 UTC30m
2026-07-13 SKW3909 - Jul 13, 03:45 UTCJul 13, 04:15 UTC30m
2026-07-13 SKW3651 SAV → DTW Jul 13, 01:05 UTCJul 13, 02:45 UTC1h 40m
2026-07-12 SKW3651 - Jul 12, 20:15 UTCJul 12, 22:20 UTC2h 5m
2026-07-12 SKW3559 - Jul 12, 18:30 UTCJul 12, 18:55 UTC25m
2026-07-12 SKW3559 - Jul 12, 16:50 UTCJul 12, 17:15 UTC25m
2026-07-12 SKW3500 - Jul 12, 14:40 UTCJul 12, 15:05 UTC25m
2026-07-12 SKW3500 - Jul 12, 13:20 UTCJul 12, 13:50 UTC30m
2026-07-11 SKW4614 - Jul 11, 23:40 UTCJul 12, 00:35 UTC55m
2026-07-11 SKW3792 - Jul 11, 16:40 UTCJul 11, 17:25 UTC45m
2026-07-11 SKW3500 - Jul 11, 14:40 UTCJul 11, 15:05 UTC25m
2026-07-11 SKW3500 - Jul 11, 13:35 UTCJul 11, 13:50 UTC15m
2026-07-11 SKW3500 - Jul 11, 13:20 UTCJul 11, 13:30 UTC10m
2026-07-11 SKW3980 - Jul 11, 11:05 UTCJul 11, 11:30 UTC25m
2026-07-11 SKW3980 AZO → DTW Jul 11, 11:05 UTCJul 11, 11:23 UTC18m
2026-07-11 SKW3909 - Jul 11, 03:15 UTCJul 11, 03:40 UTC25m
2026-07-10 SKW3675 - Jul 10, 23:45 UTCJul 11, 00:25 UTC40m
2026-07-10 SKW3675 - Jul 10, 22:00 UTCJul 10, 22:55 UTC55m
2026-07-10 SKW3581 CLE → DTW Jul 10, 19:59 UTCJul 10, 20:20 UTC21m
2026-07-10 SKW3581 - Jul 10, 18:35 UTCJul 10, 18:55 UTC20m
2026-07-10 SKW4440 - Jul 10, 16:15 UTCJul 10, 17:05 UTC50m
2026-07-10 SKW4440 - Jul 10, 14:15 UTCJul 10, 15:05 UTC50m
2026-07-10 SKW3984 - Jul 10, 12:00 UTCJul 10, 12:45 UTC45m
2026-07-10 SKW3850 - Jul 10, 00:20 UTCJul 10, 01:00 UTC40m
2026-07-09 SKW3877 - Jul 9, 22:20 UTCJul 9, 23:15 UTC55m
2026-07-09 SKW3877 DTW → LEX Jul 9, 20:35 UTCJul 9, 21:25 UTC50m
2026-07-09 SKW3752 - Jul 9, 18:50 UTCJul 9, 19:25 UTC35m
2026-07-09 SKW3752 FWA → DTW Jul 9, 18:45 UTCJul 9, 19:25 UTC40m
2026-07-09 SKW3752 - Jul 9, 16:45 UTCJul 9, 17:00 UTC15m
2026-07-09 SKW3671 - Jul 9, 14:30 UTCJul 9, 15:20 UTC50m
2026-07-09 SKW3671 - Jul 9, 12:35 UTCJul 9, 13:30 UTC55m
2026-07-09 SKW4060 - Jul 9, 09:30 UTCJul 9, 09:50 UTC20m
2026-07-09 SKW3684 - Jul 9, 03:15 UTCJul 9, 03:30 UTC15m
2026-07-08 SKW3889 - Jul 8, 23:05 UTCJul 9, 00:30 UTC1h 25m
2026-07-08 SKW3889 OMA → DTW Jul 8, 23:04 UTCJul 9, 00:30 UTC1h 26m
2026-07-08 SKW3889 - Jul 8, 20:15 UTCJul 8, 21:45 UTC1h 30m
2026-07-08 SKW3752 - Jul 8, 18:25 UTCJul 8, 18:50 UTC25m
2026-07-08 SKW3752 - Jul 8, 16:45 UTCJul 8, 17:05 UTC20m
2026-07-08 SKW3671 - Jul 8, 14:35 UTCJul 8, 15:20 UTC45m
2026-07-08 SKW3671 DTW → MSN Jul 8, 12:45 UTCJul 8, 13:40 UTC55m
2026-07-08 SKW3826 IAD → DTW Jul 8, 10:25 UTCJul 8, 11:30 UTC1h 5m

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 1h ago.
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 SKW3500, SKW3869, SKW3889, SKW4059, SKW4166.