Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A2241B

ICAO 24-bit transponder address · allocated to United States

Hex
A2241B
Octal
50422033
Decimal
10,626,075
Country
US
Broadcasting now · callsign N237SK · 2,550 ft
Flights observed
199
Distinct callsigns
1
Country
US
Last broadcast
5d ago

Current position

A2241B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2241B 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 1 distinct

Callsign Airline Flights Last seen
N237SK - 199 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N237SK DBQ → DBQ Jul 25, 02:50 UTCJul 25, 03:10 UTC20m
2026-07-25 N237SK DBQ → DBQ Jul 25, 00:15 UTCJul 25, 01:50 UTC1h 35m
2026-07-24 N237SK DBQ → DBQ Jul 24, 17:55 UTCJul 24, 18:45 UTC50m
2026-07-24 N237SK DBQ → DBQ Jul 24, 15:00 UTCJul 24, 16:00 UTC1h 0m
2026-07-23 N237SK DBQ → DBQ Jul 23, 20:35 UTCJul 23, 21:30 UTC55m
2026-07-23 N237SK - Jul 23, 18:30 UTCJul 23, 19:10 UTC40m
2026-07-23 N237SK - Jul 23, 17:30 UTCJul 23, 18:25 UTC55m
2026-07-23 N237SK DBQ → DBQ Jul 23, 14:50 UTCJul 23, 16:05 UTC1h 15m
2026-07-22 N237SK - Jul 22, 21:45 UTCJul 22, 22:05 UTC20m
2026-07-22 N237SK - Jul 22, 21:00 UTCJul 22, 21:15 UTC15m
2026-07-21 N237SK DBQ → DBQ Jul 21, 13:05 UTCJul 21, 13:50 UTC45m
2026-07-15 N237SK DBQ → DBQ Jul 15, 23:25 UTCJul 16, 00:00 UTC35m
2026-07-15 N237SK DBQ → DBQ Jul 15, 21:15 UTCJul 15, 22:30 UTC1h 15m
2026-07-15 N237SK - Jul 15, 18:45 UTCJul 15, 18:55 UTC10m
2026-07-15 N237SK - Jul 15, 17:30 UTCJul 15, 17:55 UTC25m
2026-07-15 N237SK DBQ → DBQ Jul 15, 14:30 UTCJul 15, 15:10 UTC40m
2026-07-15 N237SK DBQ → DBQ Jul 15, 12:40 UTCJul 15, 13:15 UTC35m
2026-07-14 N237SK DBQ → DBQ Jul 14, 22:35 UTCJul 14, 23:10 UTC34m
2026-07-14 N237SK - Jul 14, 21:10 UTCJul 14, 21:25 UTC15m
2026-07-14 N237SK - Jul 14, 20:20 UTCJul 14, 20:40 UTC20m
2026-07-14 N237SK - Jul 14, 18:50 UTCJul 14, 19:05 UTC15m
2026-07-14 N237SK - Jul 14, 17:55 UTCJul 14, 18:20 UTC25m
2026-07-14 N237SK - Jul 14, 16:55 UTCJul 14, 17:50 UTC55m
2026-07-14 N237SK - Jul 14, 15:45 UTCJul 14, 16:15 UTC30m
2026-07-14 N237SK - Jul 14, 15:25 UTCJul 14, 15:40 UTC15m
2026-07-14 N237SK DBQ → DBQ Jul 14, 13:15 UTCJul 14, 14:10 UTC55m
2026-07-13 N237SK DBQ → DBQ Jul 13, 23:15 UTCJul 14, 01:20 UTC2h 5m
2026-07-13 N237SK DBQ → DBQ Jul 13, 21:15 UTCJul 13, 21:55 UTC40m
2026-07-13 N237SK DBQ → DBQ Jul 13, 19:15 UTCJul 13, 20:15 UTC1h 0m
2026-07-13 N237SK DBQ → DBQ Jul 13, 16:20 UTCJul 13, 17:25 UTC1h 5m
2026-07-13 N237SK - Jul 13, 14:40 UTCJul 13, 15:25 UTC45m
2026-07-13 N237SK - Jul 13, 12:30 UTCJul 13, 13:15 UTC45m
2026-07-11 N237SK DBQ → DBQ Jul 11, 17:40 UTCJul 11, 18:35 UTC55m
2026-07-11 N237SK - Jul 11, 15:55 UTCJul 11, 16:50 UTC55m
2026-07-11 N237SK DBQ → DBQ Jul 11, 14:55 UTCJul 11, 15:15 UTC20m
2026-07-09 N237SK DBQ → DBQ Jul 9, 17:55 UTCJul 9, 18:35 UTC40m
2026-07-09 N237SK DBQ → DBQ Jul 9, 15:40 UTCJul 9, 16:55 UTC1h 15m
2026-07-08 N237SK DBQ → DBQ Jul 8, 21:45 UTCJul 8, 22:45 UTC1h 0m
2026-07-08 N237SK - Jul 8, 19:10 UTCJul 8, 19:45 UTC35m
2026-07-08 N237SK - Jul 8, 18:00 UTCJul 8, 18:30 UTC30m
2026-07-08 N237SK DBQ → DBQ Jul 8, 16:05 UTCJul 8, 17:05 UTC1h 0m
2026-07-07 N237SK DBQ → DBQ Jul 7, 19:35 UTCJul 7, 19:40 UTC5m
2026-07-07 N237SK DBQ → DBQ Jul 7, 17:30 UTCJul 7, 18:50 UTC1h 20m
2026-07-07 N237SK DBQ → DBQ Jul 7, 15:20 UTCJul 7, 16:30 UTC1h 10m
2026-07-07 N237SK DBQ → DBQ Jul 7, 13:25 UTCJul 7, 14:15 UTC50m
2026-07-02 N237SK DBQ → DBQ Jul 2, 17:15 UTCJul 2, 17:50 UTC35m
2026-07-02 N237SK DBQ → DBQ Jul 2, 15:30 UTCJul 2, 16:05 UTC35m
2026-07-02 N237SK DBQ → DBQ Jul 2, 13:35 UTCJul 2, 14:30 UTC55m
2026-07-01 N237SK DBQ → DBQ Jul 1, 18:10 UTCJul 1, 19:20 UTC1h 10m
2026-07-01 N237SK DBQ → DBQ Jul 1, 15:30 UTCJul 1, 16:30 UTC1h 0m

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.

Mode-S A2241B frequently asked

What is Mode-S code A2241B?
A2241B is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A2241B registered?
Mode-S code A2241B 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 A2241B broadcasting right now?
Yes. Mode-S A2241B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2241B, octal 50422033, decimal 10,626,075.
What flights does A2241B operate?
Mode-S A2241B has broadcast 1 distinct callsign, including N237SK.