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sensors Mode-S transponder

A04AA9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N118HQ · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A04AA9
Octal
50045251
Decimal
10,504,873
Country
US
Tail
N118HQ
Type
E75L
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
761
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A04AA9.

Country allocation

The ICAO 24-bit address A04AA9 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
RPA4759 - 10 2026-06-25
RPA4724 - 8 2026-07-13
RPA4696 Republic Airlines 8 2026-06-05
RPA4643 - 8 2026-07-13
RPA4527 Republic Airlines 8 2026-07-21
RPA4422 - 8 2026-07-02
RPA4790 Republic Airlines 7 2026-07-26
RPA4745 - 7 2026-07-20
RPA4734 - 7 2026-07-06
RPA4709 Republic Airlines 7 2026-06-01
RPA4666 - 7 2026-07-07
RPA4564 Republic Airlines 7 2026-06-05
RPA4484 - 7 2026-07-15
RPA4426 - 7 2026-06-29
RPA4808 Republic Airlines 6 2026-07-24
RPA4748 Republic Airlines 6 2026-06-19
RPA4740 Republic Airlines 6 2026-07-22
RPA4735 - 6 2026-07-08
RPA4716 Republic Airlines 6 2026-06-02
RPA4633 - 6 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4460 SAV → PHL Jul 26, 21:15 UTCJul 26, 22:15 UTC1h 0m
2026-07-26 RPA4790 IND → PHL Jul 26, 18:55 UTCJul 26, 20:10 UTC1h 15m
2026-07-26 RPA4790 IND → PHL Jul 26, 16:20 UTCJul 26, 17:25 UTC1h 5m
2026-07-26 RPA4671 BGR → PHL Jul 26, 14:10 UTCJul 26, 14:55 UTC45m
2026-07-26 RPA4657 CVG → JFK Jul 26, 10:15 UTCJul 26, 11:55 UTC1h 40m
2026-07-26 RPA4776 JFK → BOS Jul 26, 03:15 UTCJul 26, 03:55 UTC40m
2026-07-26 RPA4776 JFK → BOS Jul 26, 03:12 UTCJul 26, 03:57 UTC45m
2026-07-26 RPA4454 PWM → DCA Jul 26, 00:30 UTCJul 26, 01:20 UTC50m
2026-07-26 RPA4454 PWM → DCA Jul 26, 00:25 UTCJul 26, 01:15 UTC50m
2026-07-25 RPA4641 LGA → MSP Jul 25, 21:59 UTCJul 25, 23:40 UTC1h 41m
2026-07-25 RPA4641 LGA → MSP Jul 25, 22:00 UTCJul 25, 23:40 UTC1h 40m
2026-07-25 RPA4738 DCA → MCI Jul 25, 18:40 UTCJul 25, 20:05 UTC1h 25m
2026-07-25 RPA4738 DCA → MCI Jul 25, 15:50 UTCJul 25, 17:25 UTC1h 35m
2026-07-25 RPA4642 DCA → PVD Jul 25, 13:15 UTCJul 25, 14:15 UTC1h 0m
2026-07-25 RPA4642 DCA → PVD Jul 25, 13:12 UTCJul 25, 14:44 UTC1h 32m
2026-07-25 RPA4627 LGA → DCA Jul 25, 11:15 UTCJul 25, 12:10 UTC55m
2026-07-25 RPA4336 MSP → PHL Jul 25, 02:40 UTCJul 25, 03:25 UTC45m
2026-07-24 RPA4390 PHL → AVL Jul 24, 22:16 UTCJul 24, 23:00 UTC44m
2026-07-24 RPA4368 JFK → BOS Jul 24, 18:55 UTCJul 24, 20:50 UTC1h 55m
2026-07-24 RPA4368 JFK → BOS Jul 24, 18:52 UTCJul 24, 20:40 UTC1h 48m
2026-07-24 RPA4385 ORD → CHS Jul 24, 16:20 UTCJul 24, 18:05 UTC1h 45m
2026-07-24 RPA4808 JFK → RDU Jul 24, 13:30 UTCJul 24, 15:00 UTC1h 30m
2026-07-24 RPA4398 MSY → DCA Jul 24, 11:25 UTCJul 24, 12:50 UTC1h 25m
2026-07-24 RPA4398 MSY → DCA Jul 24, 11:23 UTCJul 24, 12:44 UTC1h 21m
2026-07-24 RPA4660 JFK → PIT Jul 24, 03:05 UTCJul 24, 03:45 UTC40m
2026-07-24 RPA4752 LGA → ORF Jul 24, 01:20 UTCJul 24, 02:00 UTC40m
2026-07-24 RPA4752 LGA → ORF Jul 24, 01:17 UTCJul 24, 01:59 UTC42m
2026-07-23 RPA4752 LGA → ORF Jul 23, 23:00 UTCJul 23, 23:45 UTC45m
2026-07-23 RPA4514 RDU → PIT Jul 23, 20:20 UTCJul 23, 21:00 UTC40m
2026-07-23 RPA4514 RDU → PIT Jul 23, 18:15 UTCJul 23, 19:00 UTC45m
2026-07-23 RPA4515 - Jul 23, 15:20 UTCJul 23, 16:55 UTC1h 35m
2026-07-23 RPA4515 - Jul 23, 13:00 UTCJul 23, 14:20 UTC1h 20m
2026-07-23 RPA4538 JFK → DCA Jul 23, 10:57 UTCJul 23, 11:43 UTC46m
2026-07-23 RPA4538 JFK → DCA Jul 23, 11:00 UTCJul 23, 11:50 UTC50m
2026-07-23 RPA4417 CHO → LGA Jul 23, 01:35 UTCJul 23, 02:45 UTC1h 10m
2026-07-22 RPA4518 PWM → DCA Jul 22, 22:15 UTCJul 22, 23:45 UTC1h 30m
2026-07-22 RPA4740 STL → LGA Jul 22, 17:25 UTCJul 22, 19:45 UTC2h 20m
2026-07-22 RPA4740 STL → LGA Jul 22, 17:23 UTCJul 22, 19:32 UTC2h 9m
2026-07-22 RPA4740 STL → LGA Jul 22, 14:25 UTCJul 22, 16:10 UTC1h 45m
2026-07-22 RPA4444 MSP → ORD Jul 22, 11:25 UTCJul 22, 12:15 UTC50m
2026-07-22 RPA4472 PHL → ATL Jul 22, 04:40 UTCJul 22, 05:25 UTC45m
2026-07-22 RPA4774 PVD → DCA Jul 22, 00:15 UTCJul 22, 02:35 UTC2h 20m
2026-07-21 RPA4774 PVD → DCA Jul 21, 21:15 UTCJul 21, 23:00 UTC1h 45m
2026-07-21 RPA4527 MHT → CLT Jul 21, 17:15 UTCJul 21, 18:15 UTC1h 0m
2026-07-21 RPA4527 MHT → CLT Jul 21, 17:05 UTCJul 21, 19:00 UTC1h 55m
2026-07-21 RPA4527 MHT → CLT Jul 21, 14:35 UTCJul 21, 16:05 UTC1h 30m
2026-07-21 RPA4391 ALB → DCA Jul 21, 10:15 UTCJul 21, 12:45 UTC2h 30m
2026-07-21 RPA4403 GSO → LGA Jul 21, 02:30 UTCJul 21, 04:10 UTC1h 40m
2026-07-20 RPA4745 - Jul 20, 23:15 UTCJul 20, 23:50 UTC35m
2026-07-20 RPA4745 - Jul 20, 22:35 UTCJul 20, 23:50 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 N118HQ page for operator, model, and routing details .

Mode-S A04AA9 frequently asked

What is Mode-S code A04AA9?
A04AA9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N118HQ.
Where is Mode-S A04AA9 registered?
Mode-S code A04AA9 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 A04AA9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A04AA9, octal 50045251, decimal 10,504,873.
What flights does A04AA9 operate?
Mode-S A04AA9 has broadcast 20 distinct callsigns, including RPA4759, RPA4724, RPA4696, RPA4643, RPA4527.