Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A1A56D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N205JQ · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A1A56D
Octal
50322555
Decimal
10,593,645
Country
US
Tail
N205JQ
Type
E75L
No current signal · last broadcast 3h ago
Flights observed
626
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A1A56D.

Country allocation

The ICAO 24-bit address A1A56D 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
RPA5706 - 15 2026-07-03
RPA5837 - 11 2026-06-15
RPA5809 - 9 2026-07-03
RPA5614 - 9 2026-06-24
RPA5749 - 7 2026-07-07
RPA5693 - 7 2026-07-12
RPA5668 - 7 2026-06-17
RPA5622 - 7 2026-06-22
RPA5845 - 6 2026-07-10
RPA5834 Republic Airlines 6 2026-06-06
RPA5808 - 6 2026-06-29
RPA5807 - 6 2026-07-04
RPA5789 - 6 2026-07-12
RPA5708 Republic Airlines 6 2026-05-10
RPA5703 - 6 2026-07-04
RPA5682 - 6 2026-06-30
RPA5663 - 6 2026-06-30
RPA5660 Republic Airlines 6 2026-05-28
RPA5656 Republic Airlines 6 2026-06-20
RPA5649 - 6 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RPA5594 - Jul 14, 01:30 UTCJul 14, 04:05 UTC2h 35m
2026-07-13 RPA5689 DCA → BOS Jul 13, 22:55 UTCJul 14, 00:15 UTC1h 20m
2026-07-13 RPA5689 BOS → DCA Jul 13, 20:20 UTCJul 13, 21:35 UTC1h 15m
2026-07-13 RPA5592 ADW → BNH Jul 13, 17:10 UTCJul 13, 18:15 UTC1h 5m
2026-07-13 RPA5592 DCA → BOS Jul 13, 17:07 UTCJul 13, 18:09 UTC1h 2m
2026-07-13 RPA5592 - Jul 13, 14:35 UTCJul 13, 15:15 UTC40m
2026-07-13 RPA5592 BOS → DCA Jul 13, 14:33 UTCJul 13, 15:47 UTC1h 14m
2026-07-13 RPA5632 JAX → BOS Jul 13, 10:50 UTCJul 13, 13:10 UTC2h 20m
2026-07-13 RPA5593 BOS → JAX Jul 13, 01:16 UTCJul 13, 03:35 UTC2h 19m
2026-07-13 RPA5593 - Jul 13, 01:15 UTCJul 13, 03:30 UTC2h 15m
2026-07-12 RPA5789 - Jul 12, 21:35 UTCJul 12, 23:25 UTC1h 50m
2026-07-12 RPA5789 CVG → BOS Jul 12, 21:35 UTCJul 12, 23:23 UTC1h 48m
2026-07-12 RPA5789 - Jul 12, 18:30 UTCJul 12, 20:20 UTC1h 50m
2026-07-12 RPA5693 JPN → BOS Jul 12, 15:50 UTCJul 12, 16:55 UTC1h 5m
2026-07-12 RPA5693 - Jul 12, 13:30 UTCJul 12, 14:40 UTC1h 10m
2026-07-12 RPA5698 DCA → BOS Jul 12, 11:20 UTCJul 12, 12:25 UTC1h 5m
2026-07-12 RPA5666 BOS → DCA Jul 12, 00:44 UTCJul 12, 01:58 UTC1h 14m
2026-07-11 RPA5615 - Jul 11, 20:55 UTCJul 11, 22:45 UTC1h 50m
2026-07-11 RPA5615 BOS → SDF Jul 11, 17:35 UTCJul 11, 19:40 UTC2h 5m
2026-07-11 RPA5681 - Jul 11, 15:15 UTCJul 11, 16:40 UTC1h 25m
2026-07-11 RPA5681 PIT → BOS Jul 11, 15:14 UTCJul 11, 16:35 UTC1h 21m
2026-07-11 RPA5795 JFK → PIT Jul 11, 01:15 UTCJul 11, 02:20 UTC1h 5m
2026-07-10 RPA5814 BOS → JFK Jul 10, 22:20 UTCJul 10, 23:00 UTC40m
2026-07-10 RPA5814 BOS → JFK Jul 10, 22:16 UTCJul 10, 22:54 UTC38m
2026-07-10 RPA5731 - Jul 10, 19:30 UTCJul 10, 20:50 UTC1h 20m
2026-07-10 RPA5731 - Jul 10, 17:15 UTCJul 10, 18:30 UTC1h 15m
2026-07-10 RPA5845 PHL → BNH Jul 10, 13:50 UTCJul 10, 14:50 UTC1h 0m
2026-07-10 RPA5845 BOS → PHL Jul 10, 11:05 UTCJul 10, 12:05 UTC1h 0m
2026-07-10 RPA5881 - Jul 10, 04:15 UTCJul 10, 05:15 UTC1h 0m
2026-07-10 RPA5881 PIT → BOS Jul 10, 04:10 UTCJul 10, 05:17 UTC1h 7m
2026-07-10 RPA5843 LGA → PIT Jul 10, 02:25 UTCJul 10, 03:25 UTC1h 0m
2026-07-09 RPA5730 BOS → LGA Jul 9, 19:50 UTCJul 9, 20:30 UTC40m
2026-07-09 RPA5654 - Jul 9, 15:15 UTCJul 9, 16:40 UTC1h 25m
2026-07-09 RPA5654 BOS → CMH Jul 9, 12:25 UTCJul 9, 14:15 UTC1h 50m
2026-07-09 RPA5765 JFK → BOS Jul 9, 10:15 UTCJul 9, 10:55 UTC40m
2026-07-09 RPA5765 JFK → BOS Jul 9, 10:12 UTCJul 9, 10:55 UTC43m
2026-07-09 RPA5702 BOS → JFK Jul 9, 02:00 UTCJul 9, 02:50 UTC50m
2026-07-09 RPA5702 BOS → JFK Jul 9, 02:00 UTCJul 9, 02:39 UTC39m
2026-07-08 RPA5647 - Jul 8, 23:20 UTCJul 9, 01:05 UTC1h 45m
2026-07-08 RPA5826 - Jul 8, 21:35 UTCJul 8, 22:15 UTC40m
2026-07-08 RPA5826 DTW → IND Jul 8, 21:31 UTCJul 8, 22:15 UTC44m
2026-07-08 RPA5774 - Jul 8, 18:20 UTCJul 8, 19:00 UTC40m
2026-07-08 RPA5774 - Jul 8, 16:45 UTCJul 8, 17:15 UTC30m
2026-07-08 RPA5607 - Jul 8, 14:35 UTCJul 8, 15:10 UTC35m
2026-07-08 RPA5605 - Jul 8, 12:35 UTCJul 8, 13:15 UTC40m
2026-07-08 RPA5605 LGA → PIT Jul 8, 12:33 UTCJul 8, 13:28 UTC55m
2026-07-08 RPA5799 - Jul 8, 10:40 UTCJul 8, 11:35 UTC55m
2026-07-08 RPA5705 - Jul 8, 03:15 UTCJul 8, 03:55 UTC40m
2026-07-08 RPA5705 LGA → PWM Jul 8, 03:14 UTCJul 8, 04:01 UTC47m
2026-07-08 RPA5825 - Jul 8, 00:15 UTCJul 8, 02:15 UTC2h 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 N205JQ page for operator, model, and routing details .

Mode-S A1A56D frequently asked

What is Mode-S code A1A56D?
A1A56D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N205JQ.
Where is Mode-S A1A56D registered?
Mode-S code A1A56D 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 A1A56D broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1A56D, octal 50322555, decimal 10,593,645.
What flights does A1A56D operate?
Mode-S A1A56D has broadcast 20 distinct callsigns, including RPA5706, RPA5837, RPA5809, RPA5614, RPA5749.