Apparatus

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sensors Mode-S transponder

A075DF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N129HQ · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A075DF
Octal
50072737
Decimal
10,515,935
Country
US
Tail
N129HQ
Type
E75L
Transponder active on ground
Flights observed
697
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A075DF.

Country allocation

The ICAO 24-bit address A075DF 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
RPA4735 - 14 2026-07-19
RPA4575 Republic Airlines 10 2026-07-24
RPA4729 - 9 2026-07-16
RPA4426 Republic Airlines 9 2026-05-31
RPA4408 Republic Airlines 8 2026-07-23
RPA4698 - 7 2026-07-16
RPA4561 Republic Airlines 7 2026-05-28
RPA4748 Republic Airlines 6 2026-07-25
RPA4738 - 6 2026-06-30
RPA4734 Republic Airlines 6 2026-07-23
RPA4711 - 6 2026-07-18
RPA4706 - 6 2026-07-15
RPA4642 - 6 2026-07-17
RPA4468 - 6 2026-07-10
RPA4455 Republic Airlines 6 2026-07-25
RPA4449 Republic Airlines 6 2026-07-19
RPA4420 Republic Airlines 6 2026-05-20
RPA4416 - 6 2026-06-25
RPA4366 - 6 2026-07-17
RPA4352 - 6 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4607 BOS → MEM Jul 26, 20:40 UTCJul 26, 21:45 UTC1h 5m
2026-07-26 RPA4730 BOS → IND Jul 26, 18:28 UTCJul 26, 19:23 UTC55m
2026-07-26 RPA4543 DCA → MSY Jul 26, 15:45 UTCJul 26, 16:55 UTC1h 10m
2026-07-26 RPA4543 DCA → MSY Jul 26, 13:40 UTCJul 26, 14:40 UTC1h 0m
2026-07-26 RPA4580 BOS → JFK Jul 26, 10:50 UTCJul 26, 12:10 UTC1h 20m
2026-07-26 RPA4580 BOS → JFK Jul 26, 10:48 UTCJul 26, 12:08 UTC1h 20m
2026-07-26 RPA4511 OMA → LGA Jul 26, 03:35 UTCJul 26, 04:35 UTC1h 0m
2026-07-25 RPA4774 PVD → DCA Jul 25, 23:55 UTCJul 26, 01:55 UTC2h 0m
2026-07-25 RPA4774 PVD → DCA Jul 25, 21:00 UTCJul 25, 22:50 UTC1h 50m
2026-07-25 RPA4748 DCA → ACK Jul 25, 17:25 UTCJul 25, 19:30 UTC2h 5m
2026-07-25 RPA4748 DCA → ACK Jul 25, 17:23 UTCJul 25, 19:25 UTC2h 2m
2026-07-25 RPA4748 DCA → ACK Jul 25, 14:30 UTCJul 25, 16:35 UTC2h 5m
2026-07-25 RPA4444 JFK → PIT Jul 25, 11:25 UTCJul 25, 12:25 UTC1h 0m
2026-07-25 RPA4472 PHL → ATL Jul 25, 04:00 UTCJul 25, 05:00 UTC1h 0m
2026-07-25 RPA4455 IND → LGA Jul 25, 01:45 UTCJul 25, 02:35 UTC50m
2026-07-24 RPA4462 LGA → CMH Jul 24, 21:50 UTCJul 24, 23:10 UTC1h 20m
2026-07-24 RPA4575 DAY → LGA Jul 24, 18:50 UTCJul 24, 20:30 UTC1h 40m
2026-07-24 RPA4575 DAY → LGA Jul 24, 15:35 UTCJul 24, 16:50 UTC1h 15m
2026-07-24 RPA4581 MEM → LGA Jul 24, 11:15 UTCJul 24, 13:50 UTC2h 35m
2026-07-24 RPA4341 DCA → SYR Jul 24, 00:50 UTCJul 24, 03:40 UTC2h 50m
2026-07-23 RPA4655 PIT → LGA Jul 23, 22:15 UTCJul 23, 23:35 UTC1h 20m
2026-07-23 RPA4655 PIT → LGA Jul 23, 22:12 UTCJul 23, 23:31 UTC1h 19m
2026-07-23 RPA4734 MEM → BOS Jul 23, 20:05 UTCJul 23, 21:03 UTC58m
2026-07-23 RPA4734 MEM → BOS Jul 23, 20:10 UTCJul 23, 21:05 UTC55m
2026-07-23 RPA4408 YYZ → ORD Jul 23, 16:20 UTCJul 23, 17:45 UTC1h 25m
2026-07-23 RPA4408 YYZ → ORD Jul 23, 13:35 UTCJul 23, 15:15 UTC1h 40m
2026-07-23 RPA4401 BOS → JFK Jul 23, 10:15 UTCJul 23, 11:05 UTC50m
2026-07-23 RPA4401 BOS → JFK Jul 23, 10:13 UTCJul 23, 10:56 UTC43m
2026-07-23 RPA4634 BOS → TVC Jul 23, 02:00 UTCJul 23, 02:45 UTC45m
2026-07-22 RPA4389 - Jul 22, 21:50 UTCJul 22, 23:10 UTC1h 20m
2026-07-22 RPA4389 JFK → CLE Jul 22, 18:50 UTCJul 22, 20:15 UTC1h 25m
2026-07-22 RPA4408 YYZ → ORD Jul 22, 16:00 UTCJul 22, 17:30 UTC1h 30m
2026-07-22 RPA4408 YYZ → ORD Jul 22, 13:05 UTCJul 22, 14:50 UTC1h 45m
2026-07-22 RPA4805 - Jul 22, 11:10 UTCJul 22, 11:30 UTC20m
2026-07-21 RPA4606 ATL → RDU Jul 21, 17:15 UTCJul 21, 19:00 UTC1h 45m
2026-07-21 RPA4606 LGA → ATL Jul 21, 13:55 UTCJul 21, 16:00 UTC2h 5m
2026-07-21 RPA4799 - Jul 21, 10:40 UTCJul 21, 12:30 UTC1h 50m
2026-07-21 RPA4799 CMH → LGA Jul 21, 10:39 UTCJul 21, 12:25 UTC1h 46m
2026-07-21 RPA4641 BOS → CMH Jul 21, 00:30 UTCJul 21, 02:10 UTC1h 40m
2026-07-20 RPA4440 PWM → DCA Jul 20, 22:15 UTCJul 20, 23:15 UTC1h 0m
2026-07-20 RPA4440 PWM → DCA Jul 20, 19:25 UTCJul 20, 20:30 UTC1h 5m
2026-07-20 RPA4399 CMH → BOS Jul 20, 16:20 UTCJul 20, 17:55 UTC1h 35m
2026-07-20 RPA4399 CMH → BOS Jul 20, 16:20 UTCJul 20, 17:52 UTC1h 32m
2026-07-20 RPA4399 BOS → CMH Jul 20, 14:05 UTCJul 20, 15:40 UTC1h 35m
2026-07-20 RPA4806 ROC → BNH Jul 20, 12:05 UTCJul 20, 13:00 UTC55m
2026-07-20 RPA4662 BOS → ROC Jul 20, 01:40 UTCJul 20, 02:45 UTC1h 5m
2026-07-19 RPA4726 - Jul 19, 22:45 UTCJul 20, 00:35 UTC1h 50m
2026-07-19 RPA4449 JFK → IND Jul 19, 19:55 UTCJul 19, 21:35 UTC1h 40m
2026-07-19 RPA4449 JFK → IND Jul 19, 19:54 UTCJul 19, 21:34 UTC1h 40m
2026-07-19 RPA4350 - Jul 19, 16:15 UTCJul 19, 18:00 UTC1h 45m

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 N129HQ page for operator, model, and routing details .

Mode-S A075DF frequently asked

What is Mode-S code A075DF?
A075DF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N129HQ.
Where is Mode-S A075DF registered?
Mode-S code A075DF 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 A075DF broadcasting right now?
Mode-S A075DF is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A075DF, octal 50072737, decimal 10,515,935.
What flights does A075DF operate?
Mode-S A075DF has broadcast 20 distinct callsigns, including RPA4735, RPA4575, RPA4729, RPA4426, RPA4408.