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sensors Mode-S transponder

A23844

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N242JQ · EMBRAER ERJ-170-200 (long wing) · operated by DELTA AIR LINES INC

Hex
A23844
Octal
50434104
Decimal
10,631,236
Country
US
Tail
N242JQ
Type
E75L
No current signal · last broadcast 6h ago
Flights observed
416
Distinct callsigns
20
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S A23844.

Country allocation

The ICAO 24-bit address A23844 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
RPA5668 - 11 2026-07-08
RPA5829 Republic Airlines 8 2026-05-11
RPA5619 Republic Airlines 8 2026-04-17
RPA5804 - 7 2026-07-11
RPA5736 - 7 2026-07-13
RPA5671 - 7 2026-07-13
RPA5601 - 7 2026-06-17
RPA5861 - 6 2026-07-13
RPA5775 - 6 2026-07-02
RPA5626 - 6 2026-07-10
RPA5603 - 6 2026-07-10
RPA5859 - 5 2026-06-29
RPA5854 Republic Airlines 5 2026-04-20
RPA5842 - 5 2026-06-28
RPA5837 - 5 2026-07-03
RPA5787 - 5 2026-07-08
RPA5785 - 5 2026-07-08
RPA5763 - 5 2026-06-29
RPA5701 Republic Airlines 5 2026-04-28
RPA5675 - 5 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 RPA5671 LGA → CMH Jul 13, 21:45 UTCJul 13, 23:00 UTC1h 15m
2026-07-13 RPA5671 LGA → CMH Jul 13, 21:43 UTCJul 13, 22:55 UTC1h 12m
2026-07-13 RPA5736 BOS → LGA Jul 13, 19:24 UTCJul 13, 20:03 UTC39m
2026-07-13 RPA5736 BOS → LGA Jul 13, 19:25 UTCJul 13, 20:10 UTC45m
2026-07-13 RPA5861 - Jul 13, 16:05 UTCJul 13, 17:40 UTC1h 35m
2026-07-13 RPA5621 - Jul 13, 13:05 UTCJul 13, 14:30 UTC1h 25m
2026-07-13 RPA5652 - Jul 13, 10:15 UTCJul 13, 11:50 UTC1h 35m
2026-07-13 RPA5832 - Jul 13, 00:10 UTCJul 13, 00:55 UTC45m
2026-07-12 RPA5827 - Jul 12, 21:35 UTCJul 12, 22:20 UTC45m
2026-07-12 RPA5827 IND → DTW Jul 12, 21:35 UTCJul 12, 22:21 UTC46m
2026-07-12 RPA5627 BOS → IND Jul 12, 18:10 UTCJul 12, 20:10 UTC2h 0m
2026-07-12 RPA5596 SAV → BOS Jul 12, 14:40 UTCJul 12, 16:40 UTC2h 0m
2026-07-12 RPA5596 BOS → SAV Jul 12, 11:20 UTCJul 12, 13:30 UTC2h 10m
2026-07-11 RPA5798 JFK → BOS Jul 11, 22:50 UTCJul 11, 23:35 UTC45m
2026-07-11 RPA5804 - Jul 11, 19:50 UTCJul 11, 20:35 UTC45m
2026-07-11 RPA5804 - Jul 11, 17:25 UTCJul 11, 17:55 UTC30m
2026-07-11 RPA5624 DCA → JFK Jul 11, 15:15 UTCJul 11, 16:05 UTC50m
2026-07-11 RPA5750 JFK → DCA Jul 11, 13:00 UTCJul 11, 13:45 UTC45m
2026-07-11 RPA5802 DCA → JFK Jul 11, 10:20 UTCJul 11, 11:00 UTC40m
2026-07-11 RPA5802 DCA → JFK Jul 11, 10:17 UTCJul 11, 10:59 UTC42m
2026-07-11 RPA5666 BOS → DCA Jul 11, 01:03 UTCJul 11, 02:13 UTC1h 10m
2026-07-11 RPA5666 - Jul 11, 01:05 UTCJul 11, 02:25 UTC1h 20m
2026-07-10 RPA5603 - Jul 10, 20:55 UTCJul 10, 22:50 UTC1h 55m
2026-07-10 RPA5603 MSN → BOS Jul 10, 20:53 UTCJul 10, 22:53 UTC2h 0m
2026-07-10 RPA5603 BOS → MSN Jul 10, 17:20 UTCJul 10, 19:40 UTC2h 20m
2026-07-10 RPA5626 - Jul 10, 14:10 UTCJul 10, 15:55 UTC1h 45m
2026-07-10 RPA5626 - Jul 10, 10:40 UTCJul 10, 12:20 UTC1h 40m
2026-07-10 RPA5657 - Jul 10, 00:35 UTCJul 10, 02:45 UTC2h 10m
2026-07-10 RPA5657 JAX → BOS Jul 10, 00:33 UTCJul 10, 02:44 UTC2h 11m
2026-07-09 RPA5657 BOS → JAX Jul 9, 21:25 UTCJul 9, 23:50 UTC2h 25m
2026-07-09 RPA5615 - Jul 9, 17:05 UTCJul 9, 19:00 UTC1h 55m
2026-07-09 RPA5615 SDF → BOS Jul 9, 17:01 UTCJul 9, 19:03 UTC2h 2m
2026-07-09 RPA5615 BOS → SDF Jul 9, 14:00 UTCJul 9, 16:05 UTC2h 5m
2026-07-09 RPA5698 DCA → BOS Jul 9, 11:50 UTCJul 9, 12:55 UTC1h 5m
2026-07-09 RPA5698 DCA → BOS Jul 9, 11:46 UTCJul 9, 12:53 UTC1h 7m
2026-07-09 RPA5704 BOS → DCA Jul 9, 01:55 UTCJul 9, 03:15 UTC1h 20m
2026-07-08 RPA5787 - Jul 8, 23:25 UTCJul 9, 00:40 UTC1h 15m
2026-07-08 RPA5787 PIT → BOS Jul 8, 23:21 UTCJul 9, 00:35 UTC1h 14m
2026-07-08 RPA5680 - Jul 8, 20:35 UTCJul 8, 21:50 UTC1h 15m
2026-07-08 RPA5668 BWI → BOS Jul 8, 18:05 UTCJul 8, 19:05 UTC1h 0m
2026-07-08 RPA5668 BOS → BWI Jul 8, 16:05 UTCJul 8, 17:15 UTC1h 10m
2026-07-08 RPA5785 LGA → BOS Jul 8, 14:15 UTCJul 8, 14:50 UTC35m
2026-07-08 RPA5771 - Jul 8, 10:15 UTCJul 8, 11:55 UTC1h 40m
2026-07-07 RPA5874 - Jul 7, 10:50 UTCJul 7, 12:10 UTC1h 20m
2026-07-07 RPA5874 RIC → IND Jul 7, 10:47 UTCJul 7, 11:57 UTC1h 10m
2026-07-07 RPA5676 BOS → RIC Jul 7, 03:16 UTCJul 7, 04:39 UTC1h 23m
2026-07-07 RPA5676 - Jul 7, 03:20 UTCJul 7, 04:35 UTC1h 15m
2026-07-06 RPA5647 OMA → LGA Jul 6, 23:25 UTCJul 7, 01:10 UTC1h 45m
2026-07-06 RPA5826 - Jul 6, 20:35 UTCJul 6, 21:20 UTC45m
2026-07-06 RPA5774 - Jul 6, 18:45 UTCJul 6, 19:25 UTC40m

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 N242JQ page for operator, model, and routing details .

Mode-S A23844 frequently asked

What is Mode-S code A23844?
A23844 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N242JQ.
Where is Mode-S A23844 registered?
Mode-S code A23844 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 A23844 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23844, octal 50434104, decimal 10,631,236.
What flights does A23844 operate?
Mode-S A23844 has broadcast 20 distinct callsigns, including RPA5668, RPA5829, RPA5619, RPA5804, RPA5736.