Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A54312

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N438YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A54312
Octal
51241422
Decimal
10,830,610
Country
US
Tail
N438YX
Type
E75L
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
602
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A54312.

Country allocation

The ICAO 24-bit address A54312 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
RPA4496 Republic Airlines 9 2026-06-10
RPA4747 Republic Airlines 7 2026-05-20
RPA4565 Republic Airlines 7 2026-07-18
RPA4455 Republic Airlines 7 2026-06-07
RPA4735 Republic Airlines 6 2026-06-08
RPA4639 - 6 2026-06-25
RPA4609 Republic Airlines 6 2026-05-10
RPA4534 Republic Airlines 6 2026-05-20
RPA4500 Republic Airlines 6 2026-05-29
RPA4456 Republic Airlines 6 2026-05-05
RPA4421 Republic Airlines 6 2026-06-12
RPA4402 Republic Airlines 6 2026-06-15
RPA4358 - 6 2026-07-20
RPA4790 Republic Airlines 5 2026-05-19
RPA4712 - 5 2026-07-20
RPA4643 Republic Airlines 5 2026-06-05
RPA4618 Republic Airlines 5 2026-05-17
RPA4595 Republic Airlines 5 2026-05-12
RPA4450 - 5 2026-06-22
RPA4422 - 5 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA9692 BGR → CMH Jul 26, 22:20 UTCJul 26, 22:30 UTC10m
2026-07-26 RPA9691 CMH → BHM Jul 26, 20:00 UTCJul 26, 21:00 UTC1h 0m
2026-07-26 RPA9690 MHT → CLT Jul 26, 17:20 UTCJul 26, 18:25 UTC1h 5m
2026-07-26 RPA4435 MSP → LGA Jul 26, 11:05 UTCJul 26, 13:05 UTC2h 0m
2026-07-26 RPA4435 MSP → LGA Jul 26, 11:03 UTCJul 26, 13:00 UTC1h 57m
2026-07-26 RPA4634 BOS → TVC Jul 26, 01:55 UTCJul 26, 02:30 UTC35m
2026-07-25 RPA4390 PHL → AVL Jul 25, 22:30 UTCJul 25, 23:10 UTC40m
2026-07-25 RPA4368 JFK → BOS Jul 25, 18:55 UTCJul 25, 20:50 UTC1h 55m
2026-07-25 RPA4368 JFK → BOS Jul 25, 18:51 UTCJul 25, 20:46 UTC1h 55m
2026-07-25 RPA4385 ORD → CHS Jul 25, 16:16 UTCJul 25, 17:52 UTC1h 36m
2026-07-25 RPA4385 ORD → CHS Jul 25, 16:20 UTCJul 25, 17:55 UTC1h 35m
2026-07-25 RPA4808 JFK → RDU Jul 25, 13:10 UTCJul 25, 14:40 UTC1h 30m
2026-07-24 RPA4399 LGA → DCA Jul 24, 12:35 UTCJul 24, 14:15 UTC1h 40m
2026-07-24 RPA4806 PVD → DCA Jul 24, 10:15 UTCJul 24, 10:30 UTC15m
2026-07-24 RPA4806 PVD → DCA Jul 24, 10:13 UTCJul 24, 11:11 UTC58m
2026-07-24 RPA4662 LGA → RIC Jul 24, 02:25 UTCJul 24, 03:25 UTC1h 0m
2026-07-23 RPA4726 STL → LGA Jul 23, 23:30 UTCJul 24, 01:30 UTC2h 0m
2026-07-23 RPA4449 JFK → IND Jul 23, 20:55 UTCJul 23, 22:35 UTC1h 40m
2026-07-23 RPA4449 JFK → IND Jul 23, 20:52 UTCJul 23, 22:35 UTC1h 43m
2026-07-23 RPA4350 - Jul 23, 17:55 UTCJul 23, 19:35 UTC1h 40m
2026-07-23 RPA4356 JFK → ORD Jul 23, 14:45 UTCJul 23, 16:40 UTC1h 55m
2026-07-23 RPA4631 LGA → GSO Jul 23, 11:30 UTCJul 23, 12:30 UTC1h 0m
2026-07-23 RPA4631 LGA → GSO Jul 23, 11:29 UTCJul 23, 12:53 UTC1h 24m
2026-07-23 RPA4594 MCI → LGA Jul 23, 02:05 UTCJul 23, 02:35 UTC30m
2026-07-22 RPA4537 RIC → LGA Jul 22, 23:05 UTCJul 22, 23:55 UTC50m
2026-07-22 RPA4537 RIC → LGA Jul 22, 20:30 UTCJul 22, 21:20 UTC50m
2026-07-22 RPA4488 LGA → ORF Jul 22, 16:30 UTCJul 22, 19:00 UTC2h 30m
2026-07-22 RPA4488 LGA → ORF Jul 22, 13:25 UTCJul 22, 15:15 UTC1h 50m
2026-07-22 RPA4659 DCA → PWM Jul 22, 10:20 UTCJul 22, 11:45 UTC1h 25m
2026-07-22 RPA4663 CMH → DCA Jul 22, 03:05 UTCJul 22, 04:35 UTC1h 30m
2026-07-21 RPA4724 IND → BOS Jul 21, 23:40 UTCJul 22, 01:00 UTC1h 20m
2026-07-21 RPA4724 IND → BOS Jul 21, 21:55 UTCJul 21, 23:00 UTC1h 5m
2026-07-21 RPA4748 DCA → ACK Jul 21, 19:30 UTCJul 21, 19:55 UTC25m
2026-07-21 RPA4748 DCA → ACK Jul 21, 17:40 UTCJul 21, 18:30 UTC50m
2026-07-21 RPA4748 DCA → ACK Jul 21, 17:38 UTCJul 21, 19:14 UTC1h 36m
2026-07-21 RPA4748 DCA → ACK Jul 21, 14:35 UTCJul 21, 16:20 UTC1h 45m
2026-07-21 RPA4622 - Jul 21, 11:00 UTCJul 21, 12:10 UTC1h 10m
2026-07-21 RPA4603 ORD → SDF Jul 21, 01:00 UTCJul 21, 01:50 UTC50m
2026-07-20 RPA4563 BOS → SDF Jul 20, 21:35 UTCJul 20, 23:20 UTC1h 45m
2026-07-20 RPA4658 JFK → RDU Jul 20, 17:15 UTCJul 20, 18:20 UTC1h 5m
2026-07-20 RPA4658 JFK → RDU Jul 20, 17:14 UTCJul 20, 18:19 UTC1h 5m
2026-07-20 RPA4712 BNA → JFK Jul 20, 13:55 UTCJul 20, 15:55 UTC2h 0m
2026-07-20 RPA4358 DCA → BNA Jul 20, 11:25 UTCJul 20, 12:45 UTC1h 20m
2026-07-19 RPA4557 - Jul 19, 18:25 UTCJul 19, 19:45 UTC1h 20m
2026-07-19 RPA4557 DCA → HYA Jul 19, 16:10 UTCJul 19, 17:10 UTC1h 0m
2026-07-19 RPA4627 - Jul 19, 13:45 UTCJul 19, 14:35 UTC50m
2026-07-19 RPA4627 DCA → CMH Jul 19, 11:45 UTCJul 19, 12:40 UTC55m
2026-07-19 RPA4482 - Jul 19, 09:30 UTCJul 19, 10:25 UTC55m
2026-07-18 RPA9935 - Jul 18, 20:15 UTCJul 18, 21:35 UTC1h 20m
2026-07-18 RPA4565 DCA → PWM Jul 18, 18:10 UTCJul 18, 18:45 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 N438YX page for operator, model, and routing details .

Mode-S A54312 frequently asked

What is Mode-S code A54312?
A54312 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N438YX.
Where is Mode-S A54312 registered?
Mode-S code A54312 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 A54312 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54312, octal 51241422, decimal 10,830,610.
What flights does A54312 operate?
Mode-S A54312 has broadcast 20 distinct callsigns, including RPA4496, RPA4747, RPA4565, RPA4455, RPA4735.