Apparatus

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sensors Mode-S transponder

A23BFB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N243JQ · EMBRAER ERJ-170-200 (long wing) · operated by DELTA AIR LINES INC

Hex
A23BFB
Octal
50435773
Decimal
10,632,187
Country
US
Tail
N243JQ
Type
E75L
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
719
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A23BFB.

Country allocation

The ICAO 24-bit address A23BFB 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
RPA5688 - 16 2026-07-12
RPA5693 Republic Airlines 13 2026-06-18
RPA5614 - 12 2026-07-17
RPA5798 - 11 2026-07-10
RPA5804 - 10 2026-07-10
RPA5712 Republic Airlines 10 2026-07-22
RPA5602 Republic Airlines 10 2026-04-30
RPA5749 - 9 2026-07-09
RPA5709 - 9 2026-07-23
RPA5653 Republic Airlines 9 2026-07-24
RPA5641 - 9 2026-07-11
RPA5619 - 9 2026-07-06
RPA5591 Republic Airlines 9 2026-07-20
RPA5848 Republic Airlines 8 2026-07-23
RPA5767 Republic Airlines 8 2026-07-22
RPA5698 Republic Airlines 8 2026-06-09
RPA5665 - 8 2026-07-17
RPA5659 Republic Airlines 8 2026-05-29
RPA5656 Republic Airlines 8 2026-06-12
RPA5829 - 7 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA5638 DCA → BOS Jul 26, 21:45 UTCJul 26, 22:45 UTC1h 0m
2026-07-26 RPA5821 LGA → DCA Jul 26, 18:55 UTCJul 26, 20:30 UTC1h 35m
2026-07-26 RPA5761 BOS → CLT Jul 26, 17:15 UTCJul 26, 17:50 UTC35m
2026-07-26 RPA5744 BWI → BOS Jul 26, 15:25 UTCJul 26, 16:10 UTC45m
2026-07-26 RPA5631 JFK → PIT Jul 26, 10:55 UTCJul 26, 12:50 UTC1h 55m
2026-07-25 RPA5646 BOS → CMH Jul 25, 21:45 UTCJul 25, 23:20 UTC1h 35m
2026-07-25 RPA5726 RIC → BOS Jul 25, 19:20 UTCJul 25, 20:20 UTC1h 0m
2026-07-25 RPA5601 BWI → BOS Jul 25, 16:00 UTCJul 25, 17:50 UTC1h 50m
2026-07-25 RPA5601 BWI → BOS Jul 25, 13:00 UTCJul 25, 14:55 UTC1h 55m
2026-07-25 RPA5813 BOS → DCA Jul 25, 10:45 UTCJul 25, 11:55 UTC1h 10m
2026-07-25 RPA5851 LGA → JAX Jul 25, 00:50 UTCJul 25, 01:55 UTC1h 5m
2026-07-24 RPA5653 LGA → PWM Jul 24, 21:55 UTCJul 24, 23:20 UTC1h 25m
2026-07-24 RPA5653 LGA → PWM Jul 24, 18:40 UTCJul 24, 20:25 UTC1h 45m
2026-07-24 RPA5809 CLE → BOS Jul 24, 16:05 UTCJul 24, 17:15 UTC1h 10m
2026-07-24 RPA5809 CLE → BOS Jul 24, 13:35 UTCJul 24, 14:55 UTC1h 20m
2026-07-24 RPA5648 DCA → BOS Jul 24, 10:15 UTCJul 24, 11:55 UTC1h 40m
2026-07-24 RPA5807 EWR → BOS Jul 24, 00:10 UTCJul 24, 02:10 UTC2h 0m
2026-07-23 RPA5839 LGA → DCA Jul 23, 21:25 UTCJul 23, 22:30 UTC1h 5m
2026-07-23 RPA5709 LGA → DCA Jul 23, 19:05 UTCJul 23, 19:55 UTC50m
2026-07-23 RPA5848 LGA → DCA Jul 23, 15:50 UTCJul 23, 17:45 UTC1h 55m
2026-07-23 RPA5848 LGA → DCA Jul 23, 12:40 UTCJul 23, 14:50 UTC2h 10m
2026-07-23 RPA5811 - Jul 23, 10:10 UTCJul 23, 10:55 UTC45m
2026-07-23 RPA5676 LGA → DCA Jul 23, 02:45 UTCJul 23, 04:10 UTC1h 25m
2026-07-23 RPA5676 LGA → DCA Jul 23, 02:45 UTCJul 23, 04:14 UTC1h 29m
2026-07-23 RPA5746 JFK → CLT Jul 23, 00:00 UTCJul 23, 00:45 UTC45m
2026-07-22 RPA5767 BOS → JFK Jul 22, 20:50 UTCJul 22, 21:35 UTC45m
2026-07-22 RPA5767 BOS → JFK Jul 22, 18:40 UTCJul 22, 19:25 UTC45m
2026-07-22 RPA5712 SAV → BOS Jul 22, 16:20 UTCJul 22, 17:05 UTC45m
2026-07-22 RPA5712 SAV → BOS Jul 22, 16:13 UTCJul 22, 17:01 UTC48m
2026-07-22 RPA5712 SAV → BOS Jul 22, 14:40 UTCJul 22, 15:20 UTC40m
2026-07-22 RPA5691 - Jul 22, 12:10 UTCJul 22, 13:25 UTC1h 15m
2026-07-22 RPA5691 CMH → LGA Jul 22, 12:06 UTCJul 22, 13:26 UTC1h 20m
2026-07-21 RPA5889 OMA → CMH Jul 21, 16:20 UTCJul 21, 17:55 UTC1h 35m
2026-07-21 RPA5848 LGA → DCA Jul 21, 12:30 UTCJul 21, 14:30 UTC2h 0m
2026-07-21 RPA5811 - Jul 21, 10:15 UTCJul 21, 11:00 UTC45m
2026-07-21 RPA5676 BOS → RIC Jul 21, 02:24 UTCJul 21, 03:42 UTC1h 18m
2026-07-21 RPA5676 - Jul 21, 02:25 UTCJul 21, 03:40 UTC1h 15m
2026-07-20 RPA5746 JFK → CLT Jul 20, 23:55 UTCJul 21, 00:40 UTC45m
2026-07-20 RPA5767 BOS → JFK Jul 20, 21:10 UTCJul 20, 21:55 UTC45m
2026-07-20 RPA5767 BOS → JFK Jul 20, 21:03 UTCJul 20, 21:49 UTC46m
2026-07-20 RPA5767 BOS → JFK Jul 20, 19:10 UTCJul 20, 19:45 UTC35m
2026-07-20 RPA5712 - Jul 20, 17:10 UTCJul 20, 18:05 UTC55m
2026-07-20 RPA5712 ACK → LGA Jul 20, 17:05 UTCJul 20, 17:58 UTC53m
2026-07-20 RPA5712 - Jul 20, 15:30 UTCJul 20, 16:10 UTC40m
2026-07-20 RPA5811 - Jul 20, 13:25 UTCJul 20, 14:10 UTC45m
2026-07-20 RPA5815 LGA → RIC Jul 20, 03:10 UTCJul 20, 04:01 UTC51m
2026-07-20 RPA5815 - Jul 20, 03:10 UTCJul 20, 04:00 UTC50m
2026-07-20 RPA5591 BNA → LGA Jul 20, 00:40 UTCJul 20, 02:05 UTC1h 25m
2026-07-19 RPA5591 BNA → LGA Jul 19, 21:20 UTCJul 19, 23:20 UTC2h 0m
2026-07-19 RPA5712 - Jul 19, 17:55 UTCJul 19, 18:55 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.

Prefer a tail-number view? See the N243JQ page for operator, model, and routing details .

Mode-S A23BFB frequently asked

What is Mode-S code A23BFB?
A23BFB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N243JQ.
Where is Mode-S A23BFB registered?
Mode-S code A23BFB 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 A23BFB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23BFB, octal 50435773, decimal 10,632,187.
What flights does A23BFB operate?
Mode-S A23BFB has broadcast 20 distinct callsigns, including RPA5688, RPA5693, RPA5614, RPA5798, RPA5804.