Apparatus

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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 18d ago
Flights observed
547
Distinct callsigns
20
Country
US
Last broadcast
18d ago

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
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
RPA4790 Republic Airlines 5 2026-05-19
RPA4643 Republic Airlines 5 2026-06-05
RPA4618 Republic Airlines 5 2026-05-17
RPA4595 Republic Airlines 5 2026-05-12
RPA4565 Republic Airlines 5 2026-06-12
RPA4450 - 5 2026-06-22
RPA4422 - 5 2026-06-18
RPA4378 Republic Airlines 5 2026-06-03
RPA4364 Republic Airlines 5 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-26 RPA4686 - Jun 26, 02:20 UTCJun 26, 03:45 UTC1h 25m
2026-06-26 RPA4686 DCA → BNA Jun 26, 02:16 UTCJun 26, 03:40 UTC1h 24m
2026-06-25 RPA4495 - Jun 25, 22:34 UTCJun 25, 23:59 UTC1h 25m
2026-06-25 RPA4489 AGS → LGA Jun 25, 20:14 UTCJun 25, 21:35 UTC1h 20m
2026-06-25 RPA4639 - Jun 25, 17:09 UTCJun 25, 18:24 UTC1h 15m
2026-06-25 RPA4639 BNA → RDU Jun 25, 17:08 UTCJun 25, 18:21 UTC1h 13m
2026-06-25 RPA4344 - Jun 25, 14:04 UTCJun 25, 15:15 UTC1h 10m
2026-06-25 RPA4344 RDU → BNA Jun 25, 14:02 UTCJun 25, 15:14 UTC1h 12m
2026-06-25 RPA4531 - Jun 25, 12:15 UTCJun 25, 13:09 UTC55m
2026-06-25 RPA4539 - Jun 25, 04:40 UTCJun 25, 05:50 UTC1h 10m
2026-06-25 RPA4539 ORD → PIT Jun 25, 04:38 UTCJun 25, 05:48 UTC1h 10m
2026-06-25 RPA4465 MSP → ORD Jun 25, 01:47 UTCJun 25, 02:52 UTC1h 5m
2026-06-25 RPA4465 MSP → ORD Jun 25, 01:50 UTCJun 25, 02:59 UTC1h 10m
2026-06-24 RPA4425 ORD → MSP Jun 24, 21:04 UTCJun 24, 22:14 UTC1h 10m
2026-06-24 RPA4425 ORD → MSP Jun 24, 21:04 UTCJun 24, 22:11 UTC1h 7m
2026-06-24 RPA4756 - Jun 24, 17:10 UTCJun 24, 18:55 UTC1h 45m
2026-06-24 RPA4756 ORD → RDU Jun 24, 14:29 UTCJun 24, 16:05 UTC1h 35m
2026-06-24 RPA4391 - Jun 24, 10:19 UTCJun 24, 12:34 UTC2h 15m
2026-06-24 RPA4353 - Jun 24, 03:15 UTCJun 24, 04:20 UTC1h 5m
2026-06-24 RPA4572 SDF → ORD Jun 24, 00:40 UTCJun 24, 02:00 UTC1h 20m
2026-06-23 RPA4572 SDF → ORD Jun 23, 22:29 UTCJun 23, 23:29 UTC1h 0m
2026-06-23 RPA4700 - Jun 23, 19:55 UTCJun 23, 20:40 UTC45m
2026-06-23 RPA4700 DCA → RDU Jun 23, 15:40 UTCJun 23, 16:29 UTC50m
2026-06-23 RPA4393 LGA → DCA Jun 23, 13:19 UTCJun 23, 14:08 UTC49m
2026-06-23 RPA4393 LGA → DCA Jun 23, 13:19 UTCJun 23, 14:10 UTC50m
2026-06-23 RPA4393 DCA → LGA Jun 23, 11:10 UTCJun 23, 11:54 UTC45m
2026-06-23 RPA4336 - Jun 23, 05:20 UTCJun 23, 05:59 UTC40m
2026-06-23 RPA4336 DCA → JFK Jun 23, 03:25 UTCJun 23, 04:14 UTC50m
2026-06-23 RPA4727 LGA → GSO Jun 23, 01:04 UTCJun 23, 01:50 UTC45m
2026-06-22 RPA4727 LGA → GSO Jun 22, 18:44 UTCJun 22, 19:44 UTC1h 0m
2026-06-22 RPA4360 - Jun 22, 16:20 UTCJun 22, 17:44 UTC1h 25m
2026-06-22 RPA4450 - Jun 22, 12:19 UTCJun 22, 14:24 UTC2h 5m
2026-06-22 RPA4450 JFK → ORD Jun 22, 12:16 UTCJun 22, 14:20 UTC2h 4m
2026-06-22 RPA4805 - Jun 22, 09:24 UTCJun 22, 10:30 UTC1h 5m
2026-06-22 RPA4573 JFK → RDU Jun 22, 02:30 UTCJun 22, 03:40 UTC1h 10m
2026-06-21 RPA4390 BOS → JFK Jun 21, 23:30 UTCJun 22, 00:10 UTC40m
2026-06-21 RPA4390 BOS → JFK Jun 21, 23:25 UTCJun 22, 00:09 UTC44m
2026-06-21 RPA4400 PVD → DCA Jun 21, 20:34 UTCJun 21, 22:29 UTC1h 55m
2026-06-21 RPA4400 PVD → DCA Jun 21, 20:33 UTCJun 21, 22:29 UTC1h 56m
2026-06-21 RPA4412 CVG → ORD Jun 21, 17:37 UTCJun 21, 18:30 UTC53m
2026-06-21 RPA4412 ORD → CVG Jun 21, 16:04 UTCJun 21, 16:49 UTC45m
2026-06-21 RPA4360 - Jun 21, 13:04 UTCJun 21, 14:50 UTC1h 45m
2026-06-21 RPA4538 JFK → DCA Jun 21, 10:44 UTCJun 21, 11:30 UTC45m
2026-06-21 RPA4417 - Jun 21, 01:14 UTCJun 21, 02:24 UTC1h 10m
2026-06-20 RPA4518 - Jun 20, 21:25 UTCJun 20, 22:50 UTC1h 25m
2026-06-20 RPA4756 SDF → BOS Jun 20, 17:44 UTCJun 20, 19:34 UTC1h 50m
2026-06-20 RPA4756 SDF → BOS Jun 20, 14:39 UTCJun 20, 16:05 UTC1h 25m
2026-06-20 RPA4683 LGA → CHO Jun 20, 11:09 UTCJun 20, 13:09 UTC2h 0m
2026-06-20 RPA4683 LGA → CHO Jun 20, 11:07 UTCJun 20, 12:59 UTC1h 52m
2026-06-20 RPA4510 - Jun 20, 00:39 UTCJun 20, 02:19 UTC1h 40m

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 18d ago.
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, RPA4455, RPA4735, RPA4639.