Apparatus

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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 Jul 26, 21:15 UTC
Flights observed
714
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

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 - 11 2026-07-18
RPA5614 - 9 2026-06-24
RPA5845 - 8 2026-07-15
RPA5749 - 7 2026-07-07
RPA5708 - 7 2026-07-21
RPA5693 - 7 2026-07-12
RPA5668 - 7 2026-06-17
RPA5663 Republic Airlines 7 2026-07-22
RPA5657 - 7 2026-07-14
RPA5654 Republic Airlines 7 2026-07-24
RPA5622 - 7 2026-06-22
RPA5859 Republic Airlines 6 2026-07-22
RPA5838 Republic Airlines 6 2026-07-23
RPA5835 Republic Airlines 6 2026-07-26
RPA5834 Republic Airlines 6 2026-06-06
RPA5808 - 6 2026-06-29
RPA5807 - 6 2026-07-04
RPA5805 - 6 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA5685 BOS → PIT Jul 26, 20:15 UTCJul 26, 21:15 UTC1h 0m
2026-07-26 RPA5835 BOS → LGA Jul 26, 17:29 UTCJul 26, 18:18 UTC49m
2026-07-26 RPA5835 BOS → LGA Jul 26, 14:55 UTCJul 26, 15:45 UTC50m
2026-07-26 RPA5741 BOS → PIT Jul 26, 11:15 UTCJul 26, 13:00 UTC1h 45m
2026-07-26 RPA5640 ORF → LGA Jul 26, 00:00 UTCJul 26, 01:50 UTC1h 50m
2026-07-25 RPA5713 BOS → BWI Jul 25, 21:30 UTCJul 25, 22:15 UTC45m
2026-07-25 RPA5769 IND → LGA Jul 25, 18:05 UTCJul 25, 19:25 UTC1h 20m
2026-07-25 RPA5783 DCA → BNA Jul 25, 14:20 UTCJul 25, 15:45 UTC1h 25m
2026-07-25 RPA5692 MCI → LGA Jul 25, 11:45 UTCJul 25, 13:05 UTC1h 20m
2026-07-25 RPA5692 MCI → LGA Jul 25, 11:44 UTCJul 25, 12:53 UTC1h 9m
2026-07-25 RPA5751 CHS → BOS Jul 25, 01:25 UTCJul 25, 02:10 UTC45m
2026-07-24 RPA5843 LGA → BOS Jul 24, 23:05 UTCJul 25, 00:15 UTC1h 10m
2026-07-24 RPA5843 LGA → BOS Jul 24, 20:50 UTCJul 24, 21:50 UTC1h 0m
2026-07-24 RPA5730 BOS → LGA Jul 24, 18:15 UTCJul 24, 19:10 UTC55m
2026-07-24 RPA5654 BNA → LGA Jul 24, 15:20 UTCJul 24, 16:50 UTC1h 30m
2026-07-24 RPA5654 BNA → LGA Jul 24, 12:20 UTCJul 24, 14:00 UTC1h 40m
2026-07-24 RPA5765 BOS → BNA Jul 24, 10:15 UTCJul 24, 10:50 UTC35m
2026-07-24 RPA5702 BOS → JAX Jul 24, 01:50 UTCJul 24, 02:35 UTC45m
2026-07-23 RPA5647 OMA → LGA Jul 23, 23:00 UTCJul 24, 00:45 UTC1h 45m
2026-07-23 RPA5826 - Jul 23, 20:15 UTCJul 23, 21:00 UTC45m
2026-07-23 RPA5774 - Jul 23, 18:25 UTCJul 23, 18:55 UTC30m
2026-07-23 RPA5774 - Jul 23, 16:35 UTCJul 23, 17:10 UTC35m
2026-07-23 RPA5607 - Jul 23, 14:45 UTCJul 23, 15:20 UTC35m
2026-07-23 RPA5606 - Jul 23, 12:40 UTCJul 23, 13:20 UTC40m
2026-07-23 RPA5701 LGA → JAX Jul 23, 10:45 UTCJul 23, 11:25 UTC40m
2026-07-23 RPA5838 BOS → CLE Jul 23, 00:15 UTCJul 23, 00:50 UTC35m
2026-07-23 RPA5838 BOS → CLE Jul 23, 00:13 UTCJul 23, 00:41 UTC28m
2026-07-22 RPA5766 LGA → BOS Jul 22, 22:35 UTCJul 22, 23:15 UTC40m
2026-07-22 RPA5685 - Jul 22, 20:20 UTCJul 22, 21:30 UTC1h 10m
2026-07-22 RPA5859 JFK → IAD Jul 22, 18:30 UTCJul 22, 19:10 UTC40m
2026-07-22 RPA5859 JFK → IAD Jul 22, 16:40 UTCJul 22, 17:25 UTC45m
2026-07-22 RPA5720 BOS → JFK Jul 22, 13:20 UTCJul 22, 14:10 UTC50m
2026-07-22 RPA5663 BOS → JFK Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-21 RPA5895 BTV → PVD Jul 21, 22:43 UTCJul 22, 00:25 UTC1h 42m
2026-07-21 RPA5895 BTV → PVD Jul 21, 22:50 UTCJul 22, 00:30 UTC1h 40m
2026-07-21 RPA5611 DCA → BOS Jul 21, 14:30 UTCJul 21, 15:40 UTC1h 10m
2026-07-21 RPA5708 BNA → DCA Jul 21, 11:25 UTCJul 21, 12:45 UTC1h 20m
2026-07-21 RPA5707 MCI → LGA Jul 21, 01:50 UTCJul 21, 03:10 UTC1h 20m
2026-07-20 RPA5667 SDF → LGA Jul 20, 23:45 UTCJul 21, 01:00 UTC1h 15m
2026-07-20 RPA5600 MCI → LGA Jul 20, 21:08 UTCJul 20, 22:25 UTC1h 17m
2026-07-20 RPA5600 MCI → LGA Jul 20, 21:10 UTCJul 20, 22:35 UTC1h 25m
2026-07-20 RPA5857 BOS → DCA Jul 20, 17:30 UTCJul 20, 18:45 UTC1h 15m
2026-07-20 RPA5728 LGA → BOS Jul 20, 15:15 UTCJul 20, 16:00 UTC45m
2026-07-20 RPA5735 BOS → LGA Jul 20, 13:25 UTCJul 20, 14:15 UTC50m
2026-07-20 RPA5684 - Jul 20, 10:15 UTCJul 20, 11:30 UTC1h 15m
2026-07-20 RPA5655 - Jul 20, 01:30 UTCJul 20, 03:05 UTC1h 35m
2026-07-19 RPA5644 - Jul 19, 23:15 UTCJul 20, 00:15 UTC1h 0m
2026-07-19 RPA5644 BWI → BOS Jul 19, 23:11 UTCJul 20, 00:17 UTC1h 6m
2026-07-19 RPA5644 BOS → BWI Jul 19, 21:05 UTCJul 19, 22:15 UTC1h 10m
2026-07-19 RPA5842 - Jul 19, 17:25 UTCJul 19, 19:35 UTC2h 10m

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 Jul 26, 21:15 UTC.
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, RPA5845.