Apparatus

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sensors Mode-S transponder

A53436

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N434YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A53436
Octal
51232066
Decimal
10,826,806
Country
US
Tail
N434YX
Type
E75L
No current signal · last broadcast Jul 26, 20:35 UTC
Flights observed
655
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S A53436.

Country allocation

The ICAO 24-bit address A53436 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
RPA4627 - 12 2026-07-01
RPA4782 Republic Airlines 10 2026-06-15
RPA4636 Republic Airlines 10 2026-07-25
RPA4416 - 10 2026-07-11
RPA4399 Republic Airlines 10 2026-07-23
RPA4720 Republic Airlines 9 2026-05-17
RPA4456 Republic Airlines 8 2026-07-25
RPA4781 - 7 2026-06-25
RPA4459 - 7 2026-07-11
RPA4791 Republic Airlines 6 2026-05-20
RPA4626 Republic Airlines 6 2026-05-20
RPA4561 - 6 2026-07-16
RPA4481 - 6 2026-07-07
RPA4405 - 6 2026-06-30
RPA4383 - 6 2026-07-01
RPA4336 Republic Airlines 6 2026-07-24
RPA4786 Republic Airlines 5 2026-05-02
RPA4747 Republic Airlines 5 2026-06-10
RPA4735 Republic Airlines 5 2026-06-15
RPA4729 Republic Airlines 5 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4759 ORD → TVC Jul 26, 18:55 UTCJul 26, 20:25 UTC1h 30m
2026-07-26 RPA4746 LGA → ORF Jul 26, 15:45 UTCJul 26, 17:20 UTC1h 35m
2026-07-26 RPA4746 LGA → ORF Jul 26, 13:15 UTCJul 26, 14:35 UTC1h 20m
2026-07-26 RPA4597 CMH → BOS Jul 26, 10:55 UTCJul 26, 11:40 UTC45m
2026-07-26 RPA4446 DCA → PIT Jul 26, 00:10 UTCJul 26, 01:45 UTC1h 35m
2026-07-25 RPA4456 JFK → BOS Jul 25, 20:50 UTCJul 25, 22:30 UTC1h 40m
2026-07-25 RPA4636 BOS → DCA Jul 25, 17:20 UTCJul 25, 19:20 UTC2h 0m
2026-07-25 RPA4367 DCA → PVD Jul 25, 15:25 UTCJul 25, 16:00 UTC35m
2026-07-25 RPA4367 DCA → PVD Jul 25, 15:21 UTCJul 25, 16:01 UTC40m
2026-07-25 RPA4411 BOS → IND Jul 25, 11:55 UTCJul 25, 14:00 UTC2h 5m
2026-07-25 RPA4411 BOS → IND Jul 25, 11:52 UTCJul 25, 13:55 UTC2h 3m
2026-07-25 RPA4392 DCA → LGA Jul 25, 00:16 UTCJul 25, 02:07 UTC1h 51m
2026-07-25 RPA4392 DCA → LGA Jul 25, 00:20 UTCJul 25, 02:10 UTC1h 50m
2026-07-24 RPA4632 LGA → ORD Jul 24, 22:25 UTCJul 24, 23:10 UTC45m
2026-07-24 RPA4760 JFK → CLE Jul 24, 19:40 UTCJul 24, 21:15 UTC1h 35m
2026-07-24 RPA4760 JFK → CLE Jul 24, 19:35 UTCJul 24, 21:16 UTC1h 41m
2026-07-24 RPA4760 JFK → CLE Jul 24, 16:10 UTCJul 24, 18:10 UTC2h 0m
2026-07-24 RPA4716 IND → BOS Jul 24, 13:15 UTCJul 24, 15:05 UTC1h 50m
2026-07-24 RPA4664 JFK → RDU Jul 24, 10:40 UTCJul 24, 12:00 UTC1h 20m
2026-07-24 RPA4664 JFK → RDU Jul 24, 10:40 UTCJul 24, 11:58 UTC1h 18m
2026-07-24 RPA4336 MSP → PHL Jul 24, 02:45 UTCJul 24, 03:25 UTC40m
2026-07-24 RPA4456 JFK → BOS Jul 24, 01:20 UTCJul 24, 01:25 UTC5m
2026-07-23 RPA4456 JFK → BOS Jul 23, 23:40 UTCJul 24, 01:25 UTC1h 45m
2026-07-23 RPA4456 JFK → BOS Jul 23, 23:38 UTCJul 24, 01:01 UTC1h 23m
2026-07-23 RPA4636 BOS → DCA Jul 23, 18:05 UTCJul 23, 20:10 UTC2h 5m
2026-07-23 RPA4399 LGA → DCA Jul 23, 15:15 UTCJul 23, 16:45 UTC1h 30m
2026-07-23 RPA4399 LGA → DCA Jul 23, 15:14 UTCJul 23, 16:39 UTC1h 25m
2026-07-23 RPA4399 LGA → DCA Jul 23, 12:30 UTCJul 23, 14:20 UTC1h 50m
2026-07-23 RPA4806 PVD → DCA Jul 23, 10:05 UTCJul 23, 11:00 UTC55m
2026-07-23 RPA4662 LGA → RIC Jul 23, 02:25 UTCJul 23, 03:25 UTC1h 0m
2026-07-22 RPA4726 STL → LGA Jul 22, 23:20 UTCJul 23, 00:55 UTC1h 35m
2026-07-22 RPA4449 JFK → IND Jul 22, 20:13 UTCJul 22, 22:02 UTC1h 49m
2026-07-22 RPA4449 JFK → IND Jul 22, 20:15 UTCJul 22, 22:05 UTC1h 50m
2026-07-22 RPA4350 - Jul 22, 16:15 UTCJul 22, 17:50 UTC1h 35m
2026-07-22 RPA4360 BTV → DCA Jul 22, 13:10 UTCJul 22, 15:00 UTC1h 50m
2026-07-21 RPA4763 MIA → ALB Jul 21, 00:55 UTCJul 21, 01:35 UTC40m
2026-07-20 RPA4495 PHL → DCA Jul 20, 22:25 UTCJul 20, 23:45 UTC1h 20m
2026-07-20 RPA4710 PHL → DCA Jul 20, 19:40 UTCJul 20, 21:25 UTC1h 45m
2026-07-20 RPA4765 - Jul 20, 17:20 UTCJul 20, 18:30 UTC1h 10m
2026-07-20 RPA4765 RDU → JFK Jul 20, 17:17 UTCJul 20, 18:29 UTC1h 12m
2026-07-20 RPA4354 PHL → SDF Jul 20, 13:35 UTCJul 20, 15:05 UTC1h 30m
2026-07-20 RPA4659 DCA → PWM Jul 20, 09:55 UTCJul 20, 11:30 UTC1h 35m
2026-07-20 RPA4663 CMH → DCA Jul 20, 02:45 UTCJul 20, 04:10 UTC1h 25m
2026-07-20 RPA4663 CMH → DCA Jul 20, 02:45 UTCJul 20, 04:09 UTC1h 24m
2026-07-19 RPA4724 IND → BOS Jul 19, 23:35 UTCJul 20, 00:45 UTC1h 10m
2026-07-19 RPA4724 IND → BOS Jul 19, 21:30 UTCJul 19, 22:35 UTC1h 5m
2026-07-18 RPA4412 PHL → DTW Jul 18, 20:35 UTCJul 18, 22:50 UTC2h 15m
2026-07-18 RPA4412 PHL → DTW Jul 18, 16:35 UTCJul 18, 17:25 UTC50m
2026-07-18 RPA4356 - Jul 18, 13:45 UTCJul 18, 14:10 UTC25m
2026-07-18 RPA4356 - Jul 18, 12:10 UTCJul 18, 14:10 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 N434YX page for operator, model, and routing details .

Mode-S A53436 frequently asked

What is Mode-S code A53436?
A53436 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N434YX.
Where is Mode-S A53436 registered?
Mode-S code A53436 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 A53436 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A53436, octal 51232066, decimal 10,826,806.
What flights does A53436 operate?
Mode-S A53436 has broadcast 20 distinct callsigns, including RPA4627, RPA4782, RPA4636, RPA4416, RPA4399.