Apparatus

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sensors Mode-S transponder

A4F414

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N418YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A4F414
Octal
51172024
Decimal
10,810,388
Country
US
Tail
N418YX
Type
E75L
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
721
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A4F414.

Country allocation

The ICAO 24-bit address A4F414 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
RPA4421 Republic Airlines 11 2026-06-14
RPA4352 Republic Airlines 9 2026-05-30
RPA4704 Republic Airlines 8 2026-06-22
RPA4516 - 8 2026-07-02
RPA4379 Republic Airlines 8 2026-07-26
RPA4754 - 7 2026-07-07
RPA4640 - 7 2026-07-10
RPA4553 - 7 2026-07-13
RPA4426 - 7 2026-07-10
RPA4756 - 6 2026-07-11
RPA4738 Republic Airlines 6 2026-06-11
RPA4711 Republic Airlines 6 2026-06-03
RPA4647 Republic Airlines 6 2026-06-13
RPA4625 - 6 2026-07-09
RPA4570 - 6 2026-07-01
RPA4545 - 6 2026-06-25
RPA4470 Republic Airlines 6 2026-07-23
RPA4455 Republic Airlines 6 2026-07-22
RPA4440 Republic Airlines 6 2026-06-02
RPA4425 - 6 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4773 GSO → LGA Jul 26, 22:25 UTCJul 26, 23:00 UTC35m
2026-07-26 RPA4379 ORD → ALB Jul 26, 17:00 UTCJul 26, 18:05 UTC1h 5m
2026-07-26 RPA4379 ORD → ALB Jul 26, 17:00 UTCJul 26, 17:56 UTC56m
2026-07-26 RPA4379 ORD → ALB Jul 26, 14:50 UTCJul 26, 15:35 UTC45m
2026-07-26 RPA4477 DTW → LGA Jul 26, 12:20 UTCJul 26, 13:50 UTC1h 30m
2026-07-26 RPA4477 DTW → LGA Jul 26, 12:20 UTCJul 26, 13:48 UTC1h 28m
2026-07-25 RPA4630 DCA → LGA Jul 25, 21:47 UTCJul 25, 23:07 UTC1h 20m
2026-07-25 RPA4630 DCA → LGA Jul 25, 21:50 UTCJul 25, 23:10 UTC1h 20m
2026-07-25 RPA4575 DAY → LGA Jul 25, 18:25 UTCJul 25, 20:05 UTC1h 40m
2026-07-25 RPA4575 DAY → LGA Jul 25, 18:19 UTCJul 25, 20:04 UTC1h 45m
2026-07-25 RPA4575 DAY → LGA Jul 25, 15:45 UTCJul 25, 17:00 UTC1h 15m
2026-07-25 RPA4783 EYW → LGA Jul 25, 12:35 UTCJul 25, 13:55 UTC1h 20m
2026-07-25 RPA4335 PHL → DCA Jul 25, 00:30 UTCJul 25, 02:10 UTC1h 40m
2026-07-24 RPA4630 DCA → LGA Jul 24, 21:25 UTCJul 24, 22:45 UTC1h 20m
2026-07-24 RPA4630 DCA → LGA Jul 24, 19:00 UTCJul 24, 20:20 UTC1h 20m
2026-07-24 RPA4630 DCA → LGA Jul 24, 18:59 UTCJul 24, 20:15 UTC1h 16m
2026-07-24 RPA4620 LGA → RIC Jul 24, 15:00 UTCJul 24, 17:30 UTC2h 30m
2026-07-24 RPA4620 LGA → RIC Jul 24, 11:05 UTCJul 24, 13:45 UTC2h 40m
2026-07-23 RPA4470 LGA → ATL Jul 23, 22:35 UTCJul 24, 01:40 UTC3h 5m
2026-07-23 RPA4470 LGA → ATL Jul 23, 17:45 UTCJul 23, 20:55 UTC3h 10m
2026-07-23 RPA4508 CVG → BOS Jul 23, 14:35 UTCJul 23, 16:25 UTC1h 50m
2026-07-23 RPA4508 CVG → BOS Jul 23, 14:31 UTCJul 23, 16:22 UTC1h 51m
2026-07-23 RPA4508 CVG → BOS Jul 23, 11:30 UTCJul 23, 13:50 UTC2h 20m
2026-07-23 RPA4397 PWM → DCA Jul 23, 02:05 UTCJul 23, 02:55 UTC50m
2026-07-22 RPA4346 LGA → STL Jul 22, 23:45 UTCJul 23, 00:40 UTC55m
2026-07-22 RPA4781 PHL → MVY Jul 22, 20:45 UTCJul 22, 21:30 UTC45m
2026-07-22 RPA4809 JFK → CVG Jul 22, 16:20 UTCJul 22, 17:40 UTC1h 20m
2026-07-22 RPA4809 JFK → CVG Jul 22, 16:19 UTCJul 22, 17:40 UTC1h 21m
2026-07-22 RPA4442 BOS → DCA Jul 22, 05:10 UTCJul 22, 05:25 UTC15m
2026-07-22 RPA4455 IND → LGA Jul 22, 01:15 UTCJul 22, 02:35 UTC1h 20m
2026-07-22 RPA4455 IND → LGA Jul 22, 01:13 UTCJul 22, 02:13 UTC1h 0m
2026-07-21 RPA9928 BNA → IND Jul 21, 19:55 UTCJul 21, 21:10 UTC1h 15m
2026-07-21 RPA4496 LGA → BUF Jul 21, 17:00 UTCJul 21, 18:20 UTC1h 20m
2026-07-21 RPA4604 CMH → LGA Jul 21, 12:35 UTCJul 21, 14:10 UTC1h 35m
2026-07-21 RPA4604 CMH → LGA Jul 21, 12:34 UTCJul 21, 14:08 UTC1h 34m
2026-07-21 RPA4680 LGA → CMH Jul 21, 00:05 UTCJul 21, 01:20 UTC1h 15m
2026-07-21 RPA4680 LGA → CMH Jul 21, 00:03 UTCJul 21, 01:16 UTC1h 13m
2026-07-20 RPA4619 - Jul 20, 19:10 UTCJul 20, 21:50 UTC2h 40m
2026-07-20 RPA4619 - Jul 20, 15:30 UTCJul 20, 18:15 UTC2h 45m
2026-07-20 RPA4535 OKC → LGA Jul 20, 11:15 UTCJul 20, 14:25 UTC3h 10m
2026-07-20 RPA4535 OKC → LGA Jul 20, 11:12 UTCJul 20, 14:24 UTC3h 12m
2026-07-19 RPA4526 LGA → OKC Jul 19, 23:40 UTCJul 20, 02:40 UTC3h 0m
2026-07-19 RPA9936 IND → IAB Jul 19, 19:15 UTCJul 19, 22:15 UTC3h 0m
2026-07-19 RPA4619 LGA → TUL Jul 19, 15:20 UTCJul 19, 18:10 UTC2h 50m
2026-07-19 RPA4784 CVG → LGA Jul 19, 12:45 UTCJul 19, 14:25 UTC1h 40m
2026-07-18 RPA9943 JFK → CMH Jul 18, 18:00 UTCJul 18, 20:05 UTC2h 5m
2026-07-18 RPA4721 CLE → PHL Jul 18, 11:50 UTCJul 18, 13:45 UTC1h 55m
2026-07-17 RPA4470 LGA → ATL Jul 17, 22:00 UTCJul 18, 01:00 UTC3h 0m
2026-07-17 RPA4470 LGA → ATL Jul 17, 21:58 UTCJul 18, 00:55 UTC2h 57m
2026-07-17 RPA4470 LGA → ATL Jul 17, 17:50 UTCJul 17, 20:55 UTC3h 5m

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 N418YX page for operator, model, and routing details .

Mode-S A4F414 frequently asked

What is Mode-S code A4F414?
A4F414 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N418YX.
Where is Mode-S A4F414 registered?
Mode-S code A4F414 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 A4F414 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4F414, octal 51172024, decimal 10,810,388.
What flights does A4F414 operate?
Mode-S A4F414 has broadcast 20 distinct callsigns, including RPA4421, RPA4352, RPA4704, RPA4516, RPA4379.