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sensors Mode-S transponder

A1A1B6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N204JQ · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A1A1B6
Octal
50320666
Decimal
10,592,694
Country
US
Tail
N204JQ
Type
E75L
Broadcasting now · callsign RPA5769 · 3,925 ft
Flights observed
557
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:15 UTC

Current position

A1A1B6 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A1A1B6 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
RPA5678 Republic Airlines 13 2026-07-25
RPA5674 - 9 2026-07-10
RPA5647 Republic Airlines 8 2026-07-05
RPA5623 - 8 2026-07-09
RPA5845 Republic Airlines 7 2026-05-26
RPA5808 - 7 2026-07-13
RPA5660 - 7 2026-07-17
RPA5632 Republic Airlines 7 2026-05-12
RPA5615 Republic Airlines 7 2026-07-22
RPA5774 - 6 2026-07-05
RPA5731 - 6 2026-07-11
RPA5668 Republic Airlines 6 2026-05-29
RPA5640 Republic Airlines 6 2026-05-04
RPA5607 - 6 2026-07-05
RPA5858 - 5 2026-07-12
RPA5857 Republic Airlines 5 2026-05-30
RPA5843 - 5 2026-07-03
RPA5823 Republic Airlines 5 2026-07-25
RPA5752 - 5 2026-07-08
RPA5747 - 5 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA5736 BOS → EWR Jul 26, 19:25 UTCJul 26, 20:10 UTC45m
2026-07-26 RPA5861 BOS → CLT Jul 26, 16:20 UTCJul 26, 18:00 UTC1h 40m
2026-07-26 RPA5621 ORD → BOS Jul 26, 13:15 UTCJul 26, 14:45 UTC1h 30m
2026-07-26 RPA5811 JFK → BUF Jul 26, 10:40 UTCJul 26, 11:30 UTC50m
2026-07-25 RPA5665 JFK → DCA Jul 25, 21:34 UTCJul 25, 22:44 UTC1h 10m
2026-07-25 RPA5665 JFK → DCA Jul 25, 21:35 UTCJul 25, 22:50 UTC1h 15m
2026-07-25 RPA5595 BOS → JFK Jul 25, 19:00 UTCJul 25, 19:40 UTC40m
2026-07-25 RPA5823 JFK → CLT Jul 25, 16:10 UTCJul 25, 17:20 UTC1h 10m
2026-07-25 RPA5823 JFK → CLT Jul 25, 16:09 UTCJul 25, 17:13 UTC1h 4m
2026-07-25 RPA5678 SDF → LGA Jul 25, 13:30 UTCJul 25, 14:50 UTC1h 20m
2026-07-25 RPA5690 PIT → BOS Jul 25, 10:10 UTCJul 25, 11:20 UTC1h 10m
2026-07-25 RPA5722 BOS → LGA Jul 25, 01:30 UTCJul 25, 02:35 UTC1h 5m
2026-07-24 RPA5716 BOS → JFK Jul 24, 23:10 UTCJul 24, 23:55 UTC45m
2026-07-24 RPA5716 BOS → JFK Jul 24, 23:09 UTCJul 24, 23:50 UTC41m
2026-07-24 RPA5819 LGA → CLT Jul 24, 20:35 UTCJul 24, 21:05 UTC30m
2026-07-24 RPA5873 JFK → IND Jul 24, 17:25 UTCJul 24, 19:15 UTC1h 50m
2026-07-23 RPA5783 DCA → BNA Jul 23, 15:20 UTCJul 23, 16:50 UTC1h 30m
2026-07-23 RPA5750 DCA → BOS Jul 23, 13:40 UTCJul 23, 14:25 UTC45m
2026-07-23 RPA5802 JFK → IAD Jul 23, 10:15 UTCJul 23, 10:55 UTC40m
2026-07-23 RPA5704 BNA → LGA Jul 23, 03:00 UTCJul 23, 04:25 UTC1h 25m
2026-07-22 RPA5787 JFK → BOS Jul 22, 23:50 UTCJul 23, 00:55 UTC1h 5m
2026-07-22 RPA5680 BOS → CMH Jul 22, 21:25 UTCJul 22, 22:55 UTC1h 30m
2026-07-22 RPA5615 CLT → JFK Jul 22, 17:15 UTCJul 22, 19:10 UTC1h 55m
2026-07-22 RPA5615 CLT → JFK Jul 22, 14:00 UTCJul 22, 16:15 UTC2h 15m
2026-07-22 RPA5631 JFK → PIT Jul 22, 11:10 UTCJul 22, 12:40 UTC1h 30m
2026-07-22 RPA5631 JFK → PIT Jul 22, 10:52 UTCJul 22, 12:39 UTC1h 47m
2026-07-21 RPA5628 BOS → MCI Jul 21, 16:55 UTCJul 21, 19:15 UTC2h 20m
2026-07-20 RPA5616 JFK → CMH Jul 20, 22:05 UTCJul 21, 00:10 UTC2h 5m
2026-07-20 RPA5630 JFK → CLT Jul 20, 18:20 UTCJul 20, 20:20 UTC2h 0m
2026-07-20 RPA5626 CMH → LGA Jul 20, 14:10 UTCJul 20, 14:55 UTC45m
2026-07-20 RPA5626 CMH → LGA Jul 20, 10:45 UTCJul 20, 12:30 UTC1h 45m
2026-07-20 RPA5714 - Jul 20, 01:05 UTCJul 20, 02:00 UTC55m
2026-07-20 RPA5714 - Jul 20, 00:45 UTCJul 20, 00:50 UTC5m
2026-07-19 RPA5714 BOS → PHL Jul 19, 22:50 UTCJul 19, 23:50 UTC1h 0m
2026-07-19 RPA5727 DCA → LGA Jul 19, 20:50 UTCJul 19, 21:25 UTC35m
2026-07-19 RPA5744 BOS → LGA Jul 19, 15:15 UTCJul 19, 16:05 UTC50m
2026-07-19 RPA5759 LGA → BOS Jul 19, 13:20 UTCJul 19, 13:55 UTC35m
2026-07-18 RPA5849 BOS → HPN Jul 18, 02:14 UTCJul 18, 03:00 UTC46m
2026-07-17 RPA5603 - Jul 17, 21:05 UTCJul 17, 23:05 UTC2h 0m
2026-07-17 RPA5603 BOS → MSN Jul 17, 17:25 UTCJul 17, 19:49 UTC2h 25m
2026-07-17 RPA5745 LGA → BOS Jul 17, 15:10 UTCJul 17, 15:49 UTC40m
2026-07-17 RPA5660 - Jul 17, 12:15 UTCJul 17, 13:45 UTC1h 30m
2026-07-17 RPA5660 IND → LGA Jul 17, 12:10 UTCJul 17, 13:45 UTC1h 35m
2026-07-16 RPA5616 BOS → IND Jul 16, 22:30 UTCJul 17, 00:25 UTC1h 55m
2026-07-16 RPA5727 LGA → BOS Jul 16, 20:14 UTCJul 16, 20:54 UTC40m
2026-07-16 RPA5727 LGA → BOS Jul 16, 20:15 UTCJul 16, 21:00 UTC45m
2026-07-16 RPA5748 BOS → LGA Jul 16, 17:20 UTCJul 16, 18:40 UTC1h 20m
2026-07-16 RPA5626 - Jul 16, 14:10 UTCJul 16, 15:49 UTC1h 40m
2026-07-16 RPA5626 - Jul 16, 10:50 UTCJul 16, 12:25 UTC1h 35m
2026-07-16 RPA5850 LGA → BOS Jul 16, 05:30 UTCJul 16, 06:05 UTC35m

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 N204JQ page for operator, model, and routing details .

Mode-S A1A1B6 frequently asked

What is Mode-S code A1A1B6?
A1A1B6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N204JQ.
Where is Mode-S A1A1B6 registered?
Mode-S code A1A1B6 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 A1A1B6 broadcasting right now?
Yes. Mode-S A1A1B6 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1A1B6, octal 50320666, decimal 10,592,694.
What flights does A1A1B6 operate?
Mode-S A1A1B6 has broadcast 20 distinct callsigns, including RPA5678, RPA5674, RPA5647, RPA5623, RPA5845.