Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A1B449

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N209JQ · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A1B449
Octal
50332111
Decimal
10,597,449
Country
US
Tail
N209JQ
Type
E75L
Broadcasting now · callsign RPA5677 · 25,000 ft
Flights observed
730
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Current position

A1B449 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A1B449 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
RPA5731 - 18 2026-06-29
RPA5674 - 11 2026-06-22
RPA5846 - 9 2026-07-10
RPA5845 - 9 2026-06-21
RPA5706 - 9 2026-06-24
RPA5649 - 9 2026-07-08
RPA5800 - 8 2026-07-10
RPA5669 Republic Airlines 8 2026-05-22
RPA5627 - 8 2026-06-27
RPA5591 - 8 2026-07-16
RPA5843 - 7 2026-07-13
RPA5813 Republic Airlines 7 2026-07-18
RPA5810 - 7 2026-07-10
RPA5790 - 7 2026-06-27
RPA5747 - 7 2026-07-15
RPA5703 Republic Airlines 7 2026-07-23
RPA5683 Republic Airlines 7 2026-06-02
RPA5653 - 7 2026-07-17
RPA5650 - 7 2026-07-08
RPA5633 - 7 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA5657 JFK → DCA Jul 26, 20:30 UTCJul 26, 22:15 UTC1h 45m
2026-07-26 RPA5630 JFK → CLT Jul 26, 17:50 UTCJul 26, 19:30 UTC1h 40m
2026-07-26 RPA5630 JFK → CLT Jul 26, 14:40 UTCJul 26, 16:25 UTC1h 45m
2026-07-26 RPA5759 LGA → BOS Jul 26, 12:15 UTCJul 26, 12:45 UTC30m
2026-07-25 RPA5828 BOS → LGA Jul 25, 21:15 UTCJul 25, 22:30 UTC1h 15m
2026-07-25 RPA5828 BOS → LGA Jul 25, 17:13 UTCJul 25, 18:35 UTC1h 22m
2026-07-25 RPA5828 BOS → LGA Jul 25, 17:15 UTCJul 25, 18:40 UTC1h 25m
2026-07-25 RPA5847 DCA → BOS Jul 25, 13:50 UTCJul 25, 15:35 UTC1h 45m
2026-07-24 RPA5853 RDU → LGA Jul 24, 22:05 UTCJul 25, 00:05 UTC2h 0m
2026-07-24 RPA5822 CMH → LGA Jul 24, 20:00 UTCJul 24, 20:40 UTC40m
2026-07-24 RPA5822 CMH → LGA Jul 24, 18:10 UTCJul 24, 18:40 UTC30m
2026-07-24 RPA5662 DCA → LGA Jul 24, 16:25 UTCJul 24, 17:10 UTC45m
2026-07-24 RPA5662 DCA → LGA Jul 24, 15:05 UTCJul 24, 15:35 UTC30m
2026-07-24 RPA5625 CLT → BOS Jul 24, 11:10 UTCJul 24, 12:50 UTC1h 40m
2026-07-24 RPA5780 DCA → LGA Jul 24, 03:05 UTCJul 24, 04:00 UTC55m
2026-07-24 RPA5780 DCA → LGA Jul 24, 02:05 UTCJul 24, 03:00 UTC55m
2026-07-24 RPA5831 EWR → BOS Jul 24, 00:00 UTCJul 24, 00:45 UTC45m
2026-07-23 RPA5831 EWR → BOS Jul 23, 23:59 UTCJul 24, 00:50 UTC51m
2026-07-23 RPA5803 LGA → CMH Jul 23, 19:50 UTCJul 23, 21:50 UTC2h 0m
2026-07-23 RPA5803 LGA → CMH Jul 23, 16:00 UTCJul 23, 18:35 UTC2h 35m
2026-07-23 RPA5703 DCA → BOS Jul 23, 13:15 UTCJul 23, 14:20 UTC1h 5m
2026-07-23 RPA5703 DCA → BOS Jul 23, 10:50 UTCJul 23, 12:00 UTC1h 10m
2026-07-23 RPA5751 - Jul 23, 01:45 UTCJul 23, 02:25 UTC40m
2026-07-23 RPA5751 LGA → BOS Jul 23, 01:42 UTCJul 23, 02:18 UTC36m
2026-07-22 RPA5646 BOS → CMH Jul 22, 22:45 UTCJul 23, 00:20 UTC1h 35m
2026-07-22 RPA5646 BOS → CMH Jul 22, 19:50 UTCJul 22, 21:40 UTC1h 50m
2026-07-22 RPA5623 LGA → PNS Jul 22, 16:05 UTCJul 22, 17:40 UTC1h 35m
2026-07-22 RPA5623 LGA → PNS Jul 22, 16:04 UTCJul 22, 17:51 UTC1h 47m
2026-07-22 RPA5623 LGA → PNS Jul 22, 13:05 UTCJul 22, 15:10 UTC2h 5m
2026-07-22 RPA5753 JFK → CLE Jul 22, 11:10 UTCJul 22, 11:30 UTC20m
2026-07-22 RPA5753 JFK → CLE Jul 22, 10:26 UTCJul 22, 11:23 UTC57m
2026-07-21 RPA5902 BOS → PNS Jul 21, 17:20 UTCJul 21, 18:05 UTC45m
2026-07-21 RPA5750 DCA → BOS Jul 21, 13:25 UTCJul 21, 14:05 UTC40m
2026-07-21 RPA5802 JFK → IAD Jul 21, 10:15 UTCJul 21, 11:00 UTC45m
2026-07-21 RPA5666 LGA → BOS Jul 21, 02:40 UTCJul 21, 04:00 UTC1h 20m
2026-07-20 RPA5603 BOS → LGA Jul 20, 22:10 UTCJul 21, 00:05 UTC1h 54m
2026-07-20 RPA5603 BOS → LGA Jul 20, 17:40 UTCJul 20, 20:00 UTC2h 20m
2026-07-20 RPA5745 LGA → BNH Jul 20, 15:20 UTCJul 20, 16:05 UTC45m
2026-07-20 RPA5660 IND → LGA Jul 20, 12:15 UTCJul 20, 13:45 UTC1h 30m
2026-07-20 RPA5696 LGA → IND Jul 20, 01:30 UTCJul 20, 03:10 UTC1h 40m
2026-07-19 RPA5763 DCA → LGA Jul 19, 22:50 UTCJul 19, 23:30 UTC40m
2026-07-19 RPA5699 RDU → BOS Jul 19, 20:41 UTCJul 19, 21:33 UTC52m
2026-07-19 RPA5699 RDU → BOS Jul 19, 20:45 UTCJul 19, 21:40 UTC55m
2026-07-19 RPA5859 JFK → IAD Jul 19, 17:45 UTCJul 19, 18:25 UTC40m
2026-07-19 RPA5859 JFK → IAD Jul 19, 17:43 UTCJul 19, 18:22 UTC39m
2026-07-19 RPA5859 JFK → IAD Jul 19, 16:05 UTCJul 19, 16:50 UTC45m
2026-07-19 RPA5720 BOS → JFK Jul 19, 13:30 UTCJul 19, 14:10 UTC40m
2026-07-19 RPA5663 - Jul 19, 10:20 UTCJul 19, 11:50 UTC1h 30m
2026-07-19 RPA5838 DTW → CMH Jul 19, 01:40 UTCJul 19, 02:15 UTC35m
2026-07-19 RPA5838 DTW → CMH Jul 19, 01:40 UTCJul 19, 02:08 UTC28m

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 N209JQ page for operator, model, and routing details .

Mode-S A1B449 frequently asked

What is Mode-S code A1B449?
A1B449 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N209JQ.
Where is Mode-S A1B449 registered?
Mode-S code A1B449 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 A1B449 broadcasting right now?
Yes. Mode-S A1B449 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1B449, octal 50332111, decimal 10,597,449.
What flights does A1B449 operate?
Mode-S A1B449 has broadcast 20 distinct callsigns, including RPA5731, RPA5674, RPA5846, RPA5845, RPA5706.