Apparatus

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sensors Mode-S transponder

A4F05D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N417YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A4F05D
Octal
51170135
Decimal
10,809,437
Country
US
Tail
N417YX
Type
E75L
No current signal · last broadcast 6h ago
Flights observed
596
Distinct callsigns
20
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S A4F05D.

Country allocation

The ICAO 24-bit address A4F05D 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
RPA4774 - 9 2026-07-12
RPA4757 - 8 2026-07-02
RPA4561 - 8 2026-06-16
RPA4449 Republic Airlines 8 2026-05-16
RPA4352 - 8 2026-07-04
RPA4666 - 7 2026-07-11
RPA4493 Republic Airlines 7 2026-06-06
RPA4407 - 7 2026-07-06
RPA4726 - 6 2026-07-10
RPA4643 Republic Airlines 6 2026-05-28
RPA4553 - 6 2026-07-02
RPA4747 Republic Airlines 5 2026-05-11
RPA4738 Republic Airlines 5 2026-05-13
RPA4664 - 5 2026-07-08
RPA4590 Republic Airlines 5 2026-04-15
RPA4562 - 5 2026-07-04
RPA4543 Republic Airlines 5 2026-06-30
RPA4515 - 5 2026-07-07
RPA4484 - 5 2026-07-02
RPA4807 - 4 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RPA4569 - Jul 14, 00:10 UTCJul 14, 01:10 UTC1h 0m
2026-07-14 RPA4569 ORD → PIT Jul 14, 00:06 UTCJul 14, 01:06 UTC1h 0m
2026-07-13 RPA4563 - Jul 13, 20:35 UTCJul 13, 22:10 UTC1h 35m
2026-07-13 RPA4563 RDU → ORD Jul 13, 20:33 UTCJul 13, 22:12 UTC1h 39m
2026-07-13 RPA4658 - Jul 13, 17:40 UTCJul 13, 18:50 UTC1h 10m
2026-07-13 RPA4476 - Jul 13, 14:45 UTCJul 13, 16:00 UTC1h 15m
2026-07-13 RPA4387 - Jul 13, 12:30 UTCJul 13, 13:40 UTC1h 10m
2026-07-13 RPA4451 - Jul 13, 10:05 UTCJul 13, 10:55 UTC50m
2026-07-13 RPA4698 - Jul 13, 02:40 UTCJul 13, 04:15 UTC1h 35m
2026-07-13 RPA4729 - Jul 13, 00:35 UTCJul 13, 01:05 UTC30m
2026-07-12 RPA4729 - Jul 12, 23:20 UTCJul 12, 23:45 UTC25m
2026-07-12 RPA4706 - Jul 12, 18:10 UTCJul 12, 20:10 UTC2h 0m
2026-07-12 RPA4706 YQB → ORD Jul 12, 18:06 UTCJul 12, 20:10 UTC2h 4m
2026-07-12 RPA4705 - Jul 12, 15:01 UTCJul 12, 17:01 UTC2h 0m
2026-07-12 RPA4444 MSP → ORD Jul 12, 11:15 UTCJul 12, 12:15 UTC1h 0m
2026-07-12 RPA4472 ORD → MSP Jul 12, 04:15 UTCJul 12, 05:03 UTC48m
2026-07-12 RPA4774 - Jul 12, 00:35 UTCJul 12, 02:50 UTC2h 15m
2026-07-11 RPA4774 - Jul 11, 20:50 UTCJul 11, 22:30 UTC1h 40m
2026-07-11 RPA4386 - Jul 11, 17:10 UTCJul 11, 19:30 UTC2h 20m
2026-07-11 RPA4666 - Jul 11, 15:00 UTCJul 11, 15:55 UTC55m
2026-07-11 RPA4666 BOS → BUF Jul 11, 12:30 UTCJul 11, 13:30 UTC1h 0m
2026-07-11 RPA4806 ROC → BOS Jul 11, 10:10 UTCJul 11, 11:00 UTC50m
2026-07-11 RPA4662 BOS → ROC Jul 11, 01:35 UTCJul 11, 02:40 UTC1h 5m
2026-07-10 RPA4726 - Jul 10, 23:00 UTCJul 11, 00:45 UTC1h 45m
2026-07-10 RPA4452 DCA → IND Jul 10, 18:50 UTCJul 10, 20:05 UTC1h 15m
2026-07-10 RPA4574 - Jul 10, 16:30 UTCJul 10, 17:40 UTC1h 10m
2026-07-10 RPA4574 MVY → DCA Jul 10, 16:28 UTCJul 10, 17:40 UTC1h 12m
2026-07-10 RPA4567 PSQ → MVY Jul 10, 14:40 UTCJul 10, 15:30 UTC50m
2026-07-10 RPA4567 PHL → MVY Jul 10, 14:39 UTCJul 10, 15:25 UTC46m
2026-07-10 RPA4711 PHL → PHL Jul 10, 13:50 UTCJul 10, 13:55 UTC5m
2026-07-10 RPA4711 - Jul 10, 12:35 UTCJul 10, 13:55 UTC1h 20m
2026-07-10 RPA4711 CMH → PHL Jul 10, 12:30 UTCJul 10, 13:34 UTC1h 4m
2026-07-10 RPA4361 PHL → CMH Jul 10, 04:00 UTCJul 10, 05:20 UTC1h 20m
2026-07-10 RPA4361 PHL → CMH Jul 10, 03:56 UTCJul 10, 05:16 UTC1h 20m
2026-07-10 RPA4652 YYZ → PHL Jul 10, 01:30 UTCJul 10, 02:40 UTC1h 10m
2026-07-09 RPA4652 PHL → YYZ Jul 9, 20:05 UTCJul 9, 21:20 UTC1h 15m
2026-07-09 RPA4652 PHL → PHL Jul 9, 19:55 UTCJul 9, 20:00 UTC5m
2026-07-09 RPA4735 - Jul 9, 17:30 UTCJul 9, 18:40 UTC1h 10m
2026-07-09 RPA4735 ACK → PHL Jul 9, 17:25 UTCJul 9, 18:25 UTC1h 0m
2026-07-09 RPA4735 - Jul 9, 15:20 UTCJul 9, 16:10 UTC50m
2026-07-09 RPA4613 - Jul 9, 12:10 UTCJul 9, 13:50 UTC1h 40m
2026-07-09 RPA4446 - Jul 9, 00:50 UTCJul 9, 02:30 UTC1h 40m
2026-07-08 RPA4389 - Jul 8, 21:15 UTCJul 8, 22:30 UTC1h 15m
2026-07-08 RPA4389 CLE → JFK Jul 8, 21:13 UTCJul 8, 22:25 UTC1h 12m
2026-07-08 RPA4389 JFK → CLE Jul 8, 18:50 UTCJul 8, 20:00 UTC1h 10m
2026-07-08 RPA4366 BOS → JFK Jul 8, 16:55 UTCJul 8, 17:35 UTC40m
2026-07-08 RPA4716 - Jul 8, 13:10 UTCJul 8, 15:10 UTC2h 0m
2026-07-08 RPA4664 DCA → IND Jul 8, 10:40 UTCJul 8, 11:50 UTC1h 10m
2026-07-08 RPA4679 PVD → DCA Jul 8, 01:10 UTCJul 8, 02:15 UTC1h 5m
2026-07-08 RPA4679 PVD → DCA Jul 8, 01:10 UTCJul 8, 02:00 UTC50m

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 N417YX page for operator, model, and routing details .

Mode-S A4F05D frequently asked

What is Mode-S code A4F05D?
A4F05D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N417YX.
Where is Mode-S A4F05D registered?
Mode-S code A4F05D 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 A4F05D broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4F05D, octal 51170135, decimal 10,809,437.
What flights does A4F05D operate?
Mode-S A4F05D has broadcast 20 distinct callsigns, including RPA4774, RPA4757, RPA4561, RPA4449, RPA4352.