Apparatus

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sensors Mode-S transponder

A4B64B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N402YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A4B64B
Octal
51133113
Decimal
10,794,571
Country
US
Tail
N402YX
Type
E75L
No current signal · last broadcast Jul 26, 20:00 UTC
Flights observed
737
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:00 UTC

Last known position

Most recent position reported by Mode-S A4B64B.

Country allocation

The ICAO 24-bit address A4B64B 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
RPA4735 - 13 2026-07-11
RPA4774 - 9 2026-07-04
RPA4607 Republic Airlines 9 2026-07-23
RPA4420 Republic Airlines 9 2026-07-23
RPA4712 - 8 2026-07-10
RPA4668 - 8 2026-07-01
RPA4574 - 8 2026-07-15
RPA4500 Republic Airlines 8 2026-07-20
RPA4352 - 8 2026-06-23
RPA4773 - 7 2026-07-14
RPA4543 Republic Airlines 7 2026-06-28
RPA4359 - 7 2026-07-12
RPA4748 - 6 2026-07-01
RPA4504 Republic Airlines 6 2026-05-30
RPA4490 Republic Airlines 6 2026-05-18
RPA4484 - 6 2026-06-26
RPA4460 Republic Airlines 6 2026-06-14
RPA4391 - 6 2026-07-05
RPA4698 Republic Airlines 5 2026-04-28
RPA4652 Republic Airlines 5 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4371 JFK → RDU Jul 26, 18:10 UTCJul 26, 19:55 UTC1h 45m
2026-07-26 RPA4365 AVL → LGA Jul 26, 16:05 UTCJul 26, 16:30 UTC25m
2026-07-26 RPA4365 AVL → LGA Jul 26, 14:25 UTCJul 26, 16:30 UTC2h 5m
2026-07-26 RPA4365 AVL → LGA Jul 26, 14:25 UTCJul 26, 15:48 UTC1h 23m
2026-07-26 RPA4631 LGA → GSO Jul 26, 11:50 UTCJul 26, 13:25 UTC1h 35m
2026-07-25 RPA9986 LAF → IND Jul 25, 21:00 UTCJul 25, 21:55 UTC55m
2026-07-25 RPA9985 ORD → SDF Jul 25, 14:25 UTCJul 25, 15:15 UTC50m
2026-07-24 RPA4520 CVG → LGA Jul 24, 23:45 UTCJul 25, 01:05 UTC1h 20m
2026-07-24 RPA4452 PVD → DCA Jul 24, 21:30 UTCJul 24, 22:40 UTC1h 10m
2026-07-24 RPA4452 PVD → DCA Jul 24, 19:15 UTCJul 24, 20:35 UTC1h 20m
2026-07-24 RPA4431 JFK → CMH Jul 24, 15:25 UTCJul 24, 17:25 UTC2h 0m
2026-07-24 RPA4431 JFK → CMH Jul 24, 12:05 UTCJul 24, 14:15 UTC2h 10m
2026-07-24 RPA4612 PHL → BNA Jul 24, 10:10 UTCJul 24, 11:00 UTC50m
2026-07-24 RPA4612 PHL → BNA Jul 24, 10:09 UTCJul 24, 10:59 UTC50m
2026-07-23 RPA4607 BOS → MEM Jul 23, 23:35 UTCJul 24, 01:20 UTC1h 45m
2026-07-23 RPA4607 BOS → MEM Jul 23, 20:35 UTCJul 23, 22:35 UTC2h 0m
2026-07-23 RPA4375 MCI → DCA Jul 23, 18:20 UTCJul 23, 19:20 UTC1h 0m
2026-07-23 RPA4375 MCI → DCA Jul 23, 16:35 UTCJul 23, 17:25 UTC50m
2026-07-23 RPA4420 LGA → GSO Jul 23, 13:50 UTCJul 23, 14:50 UTC1h 0m
2026-07-23 RPA4420 LGA → GSO Jul 23, 11:40 UTCJul 23, 12:40 UTC1h 0m
2026-07-23 RPA4506 BNA → LGA Jul 23, 00:05 UTCJul 23, 01:20 UTC1h 15m
2026-07-22 RPA4506 BNA → LGA Jul 22, 20:55 UTCJul 22, 22:00 UTC1h 5m
2026-07-22 RPA4418 AVL → LGA Jul 22, 17:30 UTCJul 22, 18:55 UTC1h 25m
2026-07-22 RPA4418 AVL → LGA Jul 22, 14:45 UTCJul 22, 16:30 UTC1h 45m
2026-07-22 RPA4564 - Jul 22, 11:10 UTCJul 22, 13:40 UTC2h 30m
2026-07-21 RPA4647 - Jul 21, 20:55 UTCJul 21, 22:05 UTC1h 10m
2026-07-21 RPA4647 ORD → MEM Jul 21, 20:52 UTCJul 21, 22:06 UTC1h 14m
2026-07-21 RPA4412 PHL → DTW Jul 21, 17:45 UTCJul 21, 18:35 UTC50m
2026-07-21 RPA4412 PHL → DTW Jul 21, 17:40 UTCJul 21, 18:34 UTC54m
2026-07-21 RPA4412 PHL → DTW Jul 21, 16:15 UTCJul 21, 16:50 UTC35m
2026-07-21 RPA4633 - Jul 21, 12:25 UTCJul 21, 14:45 UTC2h 20m
2026-07-21 RPA4615 JFK → BNA Jul 21, 02:05 UTCJul 21, 03:40 UTC1h 35m
2026-07-21 RPA4615 JFK → BNA Jul 21, 02:01 UTCJul 21, 03:38 UTC1h 37m
2026-07-20 RPA4530 ORF → LGA Jul 20, 22:40 UTCJul 21, 00:15 UTC1h 35m
2026-07-20 RPA4530 ORF → LGA Jul 20, 20:15 UTCJul 20, 21:25 UTC1h 10m
2026-07-20 RPA4500 LGA → RIC Jul 20, 16:10 UTCJul 20, 17:45 UTC1h 35m
2026-07-20 RPA4500 LGA → RIC Jul 20, 16:07 UTCJul 20, 17:43 UTC1h 36m
2026-07-20 RPA4500 LGA → RIC Jul 20, 13:25 UTCJul 20, 14:55 UTC1h 30m
2026-07-20 RPA4427 - Jul 20, 10:35 UTCJul 20, 11:40 UTC1h 5m
2026-07-20 RPA4763 MIA → ALB Jul 20, 01:25 UTCJul 20, 02:00 UTC35m
2026-07-19 RPA4572 - Jul 19, 22:10 UTCJul 19, 23:30 UTC1h 20m
2026-07-19 RPA4572 DCA → MVY Jul 19, 20:15 UTCJul 19, 21:15 UTC1h 0m
2026-07-19 RPA4590 LGA → DCA Jul 19, 17:50 UTCJul 19, 18:40 UTC50m
2026-07-19 RPA4486 MEM → PHL Jul 19, 15:20 UTCJul 19, 16:25 UTC1h 5m
2026-07-19 RPA4486 MEM → PHL Jul 19, 13:20 UTCJul 19, 14:10 UTC50m
2026-07-18 RPA4784 CVG → LGA Jul 18, 12:05 UTCJul 18, 13:45 UTC1h 40m
2026-07-17 RPA4779 LGA → MEM Jul 17, 22:35 UTCJul 18, 00:15 UTC1h 40m
2026-07-17 RPA4697 - Jul 17, 20:04 UTCJul 17, 21:30 UTC1h 25m
2026-07-17 RPA4697 - Jul 17, 16:40 UTCJul 17, 18:10 UTC1h 30m
2026-07-17 RPA4591 - Jul 17, 13:10 UTCJul 17, 14:55 UTC1h 45m

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 N402YX page for operator, model, and routing details .

Mode-S A4B64B frequently asked

What is Mode-S code A4B64B?
A4B64B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N402YX.
Where is Mode-S A4B64B registered?
Mode-S code A4B64B 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 A4B64B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4B64B, octal 51133113, decimal 10,794,571.
What flights does A4B64B operate?
Mode-S A4B64B has broadcast 20 distinct callsigns, including RPA4735, RPA4774, RPA4607, RPA4420, RPA4712.