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sensors Mode-S transponder

A4D65C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N410YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A4D65C
Octal
51153134
Decimal
10,802,780
Country
US
Tail
N410YX
Type
E75L
Broadcasting now · callsign RPA4544 · 675 ft
Flights observed
734
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Current position

A4D65C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A4D65C 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
RPA4425 Republic Airlines 11 2026-05-27
RPA4704 Republic Airlines 10 2026-06-29
RPA4723 Republic Airlines 9 2026-06-06
RPA4747 - 8 2026-06-30
RPA4740 Republic Airlines 8 2026-07-19
RPA4673 Republic Airlines 8 2026-06-06
RPA4346 Republic Airlines 8 2026-07-25
RPA4711 Republic Airlines 7 2026-05-16
RPA4676 - 7 2026-07-11
RPA4555 - 7 2026-06-22
RPA4552 Republic Airlines 7 2026-04-30
RPA4348 - 7 2026-07-03
RPA4738 Republic Airlines 6 2026-05-23
RPA4616 Republic Airlines 6 2026-07-25
RPA4409 - 6 2026-07-09
RPA4360 - 6 2026-06-19
RPA4808 - 5 2026-07-06
RPA4791 Republic Airlines 5 2026-05-13
RPA4774 Republic Airlines 5 2026-06-03
RPA4765 - 5 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4619 ORF → LGA Jul 26, 19:10 UTCJul 26, 22:15 UTC3h 5m
2026-07-26 RPA4619 ORF → LGA Jul 26, 15:15 UTCJul 26, 18:05 UTC2h 50m
2026-07-26 RPA4522 PHL → SDF Jul 26, 12:40 UTCJul 26, 13:30 UTC50m
2026-07-25 RPA4616 PHL → SDF Jul 25, 23:30 UTCJul 26, 00:35 UTC1h 5m
2026-07-25 RPA4346 LGA → STL Jul 25, 21:30 UTCJul 25, 22:10 UTC40m
2026-07-25 RPA4371 JFK → RDU Jul 25, 18:10 UTCJul 25, 19:50 UTC1h 40m
2026-07-25 RPA4365 AVL → LGA Jul 25, 14:35 UTCJul 25, 16:30 UTC1h 55m
2026-07-25 RPA4631 LGA → GSO Jul 25, 11:20 UTCJul 25, 12:55 UTC1h 35m
2026-07-25 RPA4446 DCA → PIT Jul 25, 01:01 UTCJul 25, 02:39 UTC1h 38m
2026-07-25 RPA4446 DCA → PIT Jul 25, 01:05 UTCJul 25, 02:45 UTC1h 40m
2026-07-24 RPA4359 MCI → LGA Jul 24, 22:24 UTCJul 24, 23:14 UTC50m
2026-07-24 RPA4359 MCI → LGA Jul 24, 22:25 UTCJul 24, 23:15 UTC50m
2026-07-24 RPA4359 MCI → LGA Jul 24, 20:15 UTCJul 24, 21:15 UTC1h 0m
2026-07-24 RPA4592 LGA → MCI Jul 24, 16:50 UTCJul 24, 18:35 UTC1h 45m
2026-07-24 RPA4592 LGA → MCI Jul 24, 16:48 UTCJul 24, 18:30 UTC1h 42m
2026-07-24 RPA416 ORD → IND Jul 24, 13:55 UTCJul 24, 15:30 UTC1h 35m
2026-07-24 RPA4797 ORD → ALB Jul 24, 10:30 UTCJul 24, 11:00 UTC30m
2026-07-24 RPA4797 ORD → ALB Jul 24, 10:29 UTCJul 24, 11:59 UTC1h 30m
2026-07-23 RPA4793 LGA → IND Jul 23, 22:20 UTCJul 24, 00:00 UTC1h 40m
2026-07-23 RPA4601 MEM → LGA Jul 23, 18:55 UTCJul 23, 20:20 UTC1h 25m
2026-07-23 RPA4601 MEM → LGA Jul 23, 15:05 UTCJul 23, 16:55 UTC1h 50m
2026-07-23 RPA4693 SDF → LGA Jul 23, 10:35 UTCJul 23, 11:25 UTC50m
2026-07-23 RPA4510 CMH → PHL Jul 23, 00:40 UTCJul 23, 02:15 UTC1h 35m
2026-07-22 RPA4563 BOS → SDF Jul 22, 20:40 UTCJul 22, 22:25 UTC1h 45m
2026-07-22 RPA4639 LGA → IAH Jul 22, 17:10 UTCJul 22, 18:20 UTC1h 10m
2026-07-22 RPA4344 ORD → BOS Jul 22, 14:10 UTCJul 22, 15:00 UTC50m
2026-07-22 RPA4344 ORD → BOS Jul 22, 14:09 UTCJul 22, 15:09 UTC1h 0m
2026-07-22 RPA4531 SDF → DCA Jul 22, 12:15 UTCJul 22, 13:05 UTC50m
2026-07-21 RPA4484 IND → DCA Jul 21, 15:10 UTCJul 21, 16:15 UTC1h 5m
2026-07-21 RPA4688 LGA → ROA Jul 21, 11:15 UTCJul 21, 13:10 UTC1h 55m
2026-07-21 RPA4698 ILM → LGA Jul 21, 02:35 UTCJul 21, 04:05 UTC1h 30m
2026-07-21 RPA4729 - Jul 21, 00:50 UTCJul 21, 01:25 UTC35m
2026-07-21 RPA4729 GRR → ORD Jul 21, 00:47 UTCJul 21, 01:22 UTC35m
2026-07-20 RPA4729 - Jul 20, 23:35 UTCJul 21, 00:05 UTC30m
2026-07-20 RPA4665 - Jul 20, 19:45 UTCJul 20, 21:55 UTC2h 10m
2026-07-20 RPA9931 IND → PIT Jul 20, 17:10 UTCJul 20, 18:50 UTC1h 40m
2026-07-20 RPA9930 SDF → LGA Jul 20, 14:50 UTCJul 20, 15:50 UTC1h 0m
2026-07-19 RPA4647 - Jul 19, 22:35 UTCJul 19, 23:40 UTC1h 5m
2026-07-19 RPA4740 STL → LGA Jul 19, 17:30 UTCJul 19, 19:40 UTC2h 10m
2026-07-19 RPA4740 STL → LGA Jul 19, 14:20 UTCJul 19, 16:10 UTC1h 50m
2026-07-19 RPA4391 - Jul 19, 10:20 UTCJul 19, 12:55 UTC2h 35m
2026-07-19 RPA4403 - Jul 19, 03:25 UTCJul 19, 05:15 UTC1h 50m
2026-07-18 RPA4563 BOS → SDF Jul 18, 23:55 UTCJul 19, 01:45 UTC1h 50m
2026-07-18 RPA4563 BOS → SDF Jul 18, 23:50 UTCJul 19, 01:40 UTC1h 50m
2026-07-18 RPA4470 LGA → ATL Jul 18, 15:55 UTCJul 18, 19:45 UTC3h 50m
2026-07-18 RPA4470 LGA → ATL Jul 18, 11:05 UTCJul 18, 14:15 UTC3h 10m
2026-07-18 RPA4685 - Jul 18, 00:45 UTCJul 18, 01:25 UTC40m
2026-07-17 RPA4340 DCA → BDL Jul 17, 20:15 UTCJul 17, 21:50 UTC1h 35m
2026-07-17 RPA4340 DCA → BDL Jul 17, 16:49 UTCJul 17, 18:19 UTC1h 30m
2026-07-17 RPA4618 SAV → DCA Jul 17, 13:35 UTCJul 17, 14:50 UTC1h 15m

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 N410YX page for operator, model, and routing details .

Mode-S A4D65C frequently asked

What is Mode-S code A4D65C?
A4D65C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N410YX.
Where is Mode-S A4D65C registered?
Mode-S code A4D65C 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 A4D65C broadcasting right now?
Yes. Mode-S A4D65C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4D65C, octal 51153134, decimal 10,802,780.
What flights does A4D65C operate?
Mode-S A4D65C has broadcast 20 distinct callsigns, including RPA4425, RPA4704, RPA4723, RPA4747, RPA4740.