Apparatus

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sensors Mode-S transponder

A1D0A3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N216JQ · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A1D0A3
Octal
50350243
Decimal
10,604,707
Country
US
Tail
N216JQ
Type
E75L
No current signal · last broadcast Jul 26, 22:20 UTC
Flights observed
756
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:20 UTC

Last known position

Most recent position reported by Mode-S A1D0A3.

Country allocation

The ICAO 24-bit address A1D0A3 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
RPA5764 Republic Airlines 11 2026-05-11
RPA5842 - 10 2026-07-12
RPA5765 - 9 2026-07-04
RPA5718 Republic Airlines 9 2026-06-04
RPA5633 Republic Airlines 9 2026-05-28
RPA5859 - 8 2026-07-15
RPA5812 - 8 2026-07-20
RPA5800 - 8 2026-06-18
RPA5777 - 8 2026-07-23
RPA5708 - 8 2026-07-18
RPA5707 Republic Airlines 8 2026-07-18
RPA5687 - 8 2026-07-08
RPA5644 - 8 2026-07-12
RPA5846 Republic Airlines 7 2026-06-17
RPA5810 - 7 2026-06-17
RPA5793 - 7 2026-07-15
RPA5789 - 7 2026-06-30
RPA5702 - 7 2026-07-04
RPA5684 - 7 2026-07-13
RPA5678 - 7 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA5814 BOS → LGA Jul 26, 21:30 UTCJul 26, 22:20 UTC50m
2026-07-26 RPA5731 JFK → DCA Jul 26, 18:40 UTCJul 26, 19:55 UTC1h 15m
2026-07-26 RPA5731 JFK → DCA Jul 26, 16:00 UTCJul 26, 17:10 UTC1h 10m
2026-07-26 RPA5674 DCA → BOS Jul 26, 13:10 UTCJul 26, 14:40 UTC1h 30m
2026-07-26 RPA5674 DCA → BOS Jul 26, 10:10 UTCJul 26, 11:30 UTC1h 20m
2026-07-25 RPA5798 BOS → DCA Jul 25, 21:55 UTCJul 25, 22:30 UTC35m
2026-07-25 RPA5798 BOS → DCA Jul 25, 21:54 UTCJul 25, 22:31 UTC37m
2026-07-25 RPA5804 BOS → LGA Jul 25, 19:45 UTCJul 25, 20:20 UTC35m
2026-07-25 RPA5804 BOS → LGA Jul 25, 17:30 UTCJul 25, 18:10 UTC40m
2026-07-25 RPA5624 JAX → BOS Jul 25, 15:15 UTCJul 25, 15:55 UTC40m
2026-07-25 RPA5750 DCA → BOS Jul 25, 13:00 UTCJul 25, 13:50 UTC50m
2026-07-25 RPA5802 JFK → IAD Jul 25, 10:05 UTCJul 25, 10:50 UTC45m
2026-07-25 RPA5704 BNA → LGA Jul 25, 01:55 UTCJul 25, 03:05 UTC1h 10m
2026-07-25 RPA5704 BNA → LGA Jul 25, 01:50 UTCJul 25, 02:57 UTC1h 7m
2026-07-24 RPA5787 JFK → BOS Jul 24, 23:25 UTCJul 25, 00:30 UTC1h 5m
2026-07-24 RPA5680 BOS → CMH Jul 24, 20:30 UTCJul 24, 22:00 UTC1h 30m
2026-07-24 RPA5668 JFK → DCA Jul 24, 18:00 UTCJul 24, 18:55 UTC55m
2026-07-24 RPA5668 JFK → DCA Jul 24, 15:40 UTCJul 24, 16:55 UTC1h 15m
2026-07-24 RPA5785 BOS → RDU Jul 24, 13:40 UTCJul 24, 14:15 UTC35m
2026-07-24 RPA5652 BNA → LGA Jul 24, 10:15 UTCJul 24, 12:00 UTC1h 45m
2026-07-24 RPA5652 BNA → LGA Jul 24, 10:13 UTCJul 24, 11:50 UTC1h 37m
2026-07-24 RPA5832 OMA → LGA Jul 24, 00:05 UTCJul 24, 00:55 UTC50m
2026-07-23 RPA5827 JFK → IAD Jul 23, 21:45 UTCJul 23, 22:25 UTC40m
2026-07-23 RPA5627 BOS → IND Jul 23, 18:15 UTCJul 23, 20:20 UTC2h 5m
2026-07-23 RPA5627 BOS → IND Jul 23, 18:13 UTCJul 23, 20:19 UTC2h 6m
2026-07-23 RPA5674 DCA → BOS Jul 23, 15:30 UTCJul 23, 16:45 UTC1h 15m
2026-07-23 RPA5674 DCA → BOS Jul 23, 15:27 UTCJul 23, 16:45 UTC1h 18m
2026-07-23 RPA5674 DCA → BOS Jul 23, 12:55 UTCJul 23, 14:25 UTC1h 30m
2026-07-23 RPA5710 CMH → LGA Jul 23, 10:20 UTCJul 23, 11:20 UTC1h 0m
2026-07-23 RPA5786 IND → LGA Jul 23, 04:35 UTCJul 23, 05:50 UTC1h 15m
2026-07-23 RPA5786 IND → LGA Jul 23, 04:34 UTCJul 23, 05:46 UTC1h 12m
2026-07-23 RPA5777 DCA → BNA Jul 23, 02:05 UTCJul 23, 03:40 UTC1h 35m
2026-07-22 RPA5857 BOS → DCA Jul 22, 19:05 UTCJul 22, 20:40 UTC1h 35m
2026-07-22 RPA5611 DCA → BNH Jul 22, 14:45 UTCJul 22, 15:50 UTC1h 5m
2026-07-22 RPA5692 MCI → LGA Jul 22, 11:50 UTCJul 22, 13:05 UTC1h 15m
2026-07-21 RPA5603 BOS → LGA Jul 21, 22:15 UTCJul 22, 00:15 UTC2h 0m
2026-07-21 RPA5603 BOS → LGA Jul 21, 18:25 UTCJul 21, 20:55 UTC2h 30m
2026-07-21 RPA5626 CMH → LGA Jul 21, 14:00 UTCJul 21, 15:50 UTC1h 50m
2026-07-21 RPA5626 CMH → LGA Jul 21, 13:58 UTCJul 21, 15:43 UTC1h 45m
2026-07-21 RPA5626 CMH → LGA Jul 21, 10:40 UTCJul 21, 12:30 UTC1h 50m
2026-07-21 RPA5657 JFK → DCA Jul 21, 00:35 UTCJul 21, 03:10 UTC2h 35m
2026-07-20 RPA5657 JFK → DCA Jul 20, 21:10 UTCJul 20, 23:35 UTC2h 25m
2026-07-20 RPA5595 - Jul 20, 19:00 UTCJul 20, 19:55 UTC55m
2026-07-20 RPA5595 JFK → BOS Jul 20, 18:59 UTCJul 20, 19:47 UTC48m
2026-07-20 RPA5823 - Jul 20, 16:15 UTCJul 20, 17:20 UTC1h 5m
2026-07-20 RPA5823 PIT → JFK Jul 20, 16:13 UTCJul 20, 17:13 UTC1h 0m
2026-07-20 RPA5754 - Jul 20, 14:30 UTCJul 20, 15:10 UTC40m
2026-07-20 RPA5812 CMH → DTW Jul 20, 12:25 UTCJul 20, 13:10 UTC45m
2026-07-20 RPA5838 - Jul 20, 00:10 UTCJul 20, 00:45 UTC35m
2026-07-19 RPA5766 LGA → BOS Jul 19, 22:13 UTCJul 19, 22:54 UTC41m

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 N216JQ page for operator, model, and routing details .

Mode-S A1D0A3 frequently asked

What is Mode-S code A1D0A3?
A1D0A3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N216JQ.
Where is Mode-S A1D0A3 registered?
Mode-S code A1D0A3 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 A1D0A3 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1D0A3, octal 50350243, decimal 10,604,707.
What flights does A1D0A3 operate?
Mode-S A1D0A3 has broadcast 20 distinct callsigns, including RPA5764, RPA5842, RPA5765, RPA5718, RPA5633.