Apparatus

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sensors Mode-S transponder

A05BDE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N122HQ · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A05BDE
Octal
50055736
Decimal
10,509,278
Country
US
Tail
N122HQ
Type
E75L
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
716
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S A05BDE.

Country allocation

The ICAO 24-bit address A05BDE 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
RPA4579 Republic Airlines 14 2026-06-03
RPA4537 - 11 2026-06-25
RPA4507 Republic Airlines 10 2026-07-25
RPA4455 - 9 2026-06-28
RPA4665 - 8 2026-06-24
RPA4436 - 8 2026-07-02
RPA4348 - 8 2026-07-14
RPA4664 - 7 2026-07-17
RPA4552 Republic Airlines 7 2026-05-14
RPA4479 Republic Airlines 7 2026-05-18
RPA4380 Republic Airlines 7 2026-05-17
RPA4379 - 7 2026-07-01
RPA4728 - 6 2026-07-16
RPA4726 - 6 2026-06-25
RPA4714 Republic Airlines 6 2026-07-25
RPA4708 - 6 2026-06-22
RPA4698 - 6 2026-06-24
RPA4632 - 6 2026-06-23
RPA4624 Republic Airlines 6 2026-05-16
RPA4590 - 6 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4514 RDU → PIT Jul 26, 20:10 UTCJul 26, 21:00 UTC50m
2026-07-26 RPA4514 RDU → PIT Jul 26, 17:45 UTCJul 26, 18:30 UTC45m
2026-07-26 RPA4515 IND → LGA Jul 26, 15:25 UTCJul 26, 16:45 UTC1h 20m
2026-07-26 RPA4515 IND → LGA Jul 26, 13:25 UTCJul 26, 14:35 UTC1h 10m
2026-07-26 RPA4786 CHA → DCA Jul 26, 10:20 UTCJul 26, 11:10 UTC50m
2026-07-25 RPA4662 LGA → RIC Jul 25, 23:35 UTCJul 26, 00:35 UTC1h 0m
2026-07-25 RPA4507 BOS → CVG Jul 25, 20:25 UTCJul 25, 22:20 UTC1h 55m
2026-07-25 RPA4507 BOS → CVG Jul 25, 20:21 UTCJul 25, 22:18 UTC1h 57m
2026-07-25 RPA4507 BOS → CVG Jul 25, 17:10 UTCJul 25, 19:05 UTC1h 55m
2026-07-25 RPA4635 ORD → LGA Jul 25, 15:25 UTCJul 25, 16:10 UTC45m
2026-07-25 RPA4635 ORD → LGA Jul 25, 13:30 UTCJul 25, 14:20 UTC50m
2026-07-25 RPA4714 RDU → DCA Jul 25, 11:20 UTCJul 25, 12:15 UTC55m
2026-07-25 RPA4715 ILM → LGA Jul 25, 01:05 UTCJul 25, 02:10 UTC1h 5m
2026-07-24 RPA4709 BDL → DCA Jul 24, 22:35 UTCJul 24, 23:30 UTC55m
2026-07-24 RPA4709 BDL → DCA Jul 24, 20:25 UTCJul 24, 21:25 UTC1h 0m
2026-07-24 RPA4516 STL → DCA Jul 24, 17:20 UTCJul 24, 18:55 UTC1h 35m
2026-07-24 RPA4516 STL → DCA Jul 24, 14:15 UTCJul 24, 16:15 UTC2h 0m
2026-07-24 RPA4376 BTV → DCA Jul 24, 12:35 UTCJul 24, 13:10 UTC35m
2026-07-24 RPA4401 BOS → ORD Jul 24, 10:10 UTCJul 24, 10:55 UTC45m
2026-07-24 RPA4382 BUF → PHL Jul 24, 02:05 UTCJul 24, 03:10 UTC1h 5m
2026-07-24 RPA4382 BUF → PHL Jul 24, 02:01 UTCJul 24, 03:02 UTC1h 1m
2026-07-23 RPA4468 DCA → DSM Jul 23, 23:35 UTCJul 24, 01:10 UTC1h 35m
2026-07-23 RPA4468 DCA → DSM Jul 23, 20:45 UTCJul 23, 22:40 UTC1h 55m
2026-07-23 RA4757 - Jul 23, 17:40 UTCJul 23, 18:25 UTC45m
2026-07-23 RPA4484 IND → DCA Jul 23, 15:10 UTCJul 23, 16:10 UTC1h 0m
2026-07-23 RPA4625 - Jul 23, 12:10 UTCJul 23, 13:30 UTC1h 20m
2026-07-23 RPA4625 PIT → ORD Jul 23, 12:09 UTCJul 23, 13:20 UTC1h 11m
2026-07-23 RPA4611 JFK → PIT Jul 23, 01:40 UTCJul 23, 02:45 UTC1h 5m
2026-07-23 RPA4611 JFK → PIT Jul 23, 01:40 UTCJul 23, 02:46 UTC1h 6m
2026-07-22 RPA4456 - Jul 22, 23:50 UTCJul 23, 00:40 UTC50m
2026-07-22 RPA4456 - Jul 22, 23:00 UTCJul 23, 00:40 UTC1h 40m
2026-07-22 RPA4456 IND → JFK Jul 22, 22:58 UTCJul 22, 23:31 UTC33m
2026-07-22 RPA4452 PVD → DCA Jul 22, 20:40 UTCJul 22, 22:10 UTC1h 30m
2026-07-22 RPA4452 PVD → DCA Jul 22, 20:36 UTCJul 22, 22:04 UTC1h 28m
2026-07-22 RPA4405 BOS → ORD Jul 22, 18:15 UTCJul 22, 19:20 UTC1h 5m
2026-07-22 RPA4405 BOS → ORD Jul 22, 15:30 UTCJul 22, 16:25 UTC55m
2026-07-22 RPA4352 SDF → DCA Jul 22, 11:45 UTCJul 22, 12:55 UTC1h 10m
2026-07-22 RPA4352 SDF → DCA Jul 22, 11:44 UTCJul 22, 12:56 UTC1h 12m
2026-07-21 RPA9934 RDU → IND Jul 21, 17:00 UTCJul 21, 18:30 UTC1h 30m
2026-07-21 RPA4354 PHL → SDF Jul 21, 13:35 UTCJul 21, 15:00 UTC1h 25m
2026-07-21 RPA4354 PHL → SDF Jul 21, 13:31 UTCJul 21, 15:03 UTC1h 32m
2026-07-21 RPA4519 DCA → CMH Jul 21, 10:20 UTCJul 21, 11:15 UTC55m
2026-07-20 RPA4395 LGA → DSM Jul 20, 23:00 UTCJul 21, 01:35 UTC2h 35m
2026-07-20 RPA4758 - Jul 20, 20:10 UTCJul 20, 21:20 UTC1h 10m
2026-07-20 RPA4453 JFK → CLE Jul 20, 17:10 UTCJul 20, 18:20 UTC1h 10m
2026-07-20 RPA4453 JFK → CLE Jul 20, 17:10 UTCJul 20, 18:19 UTC1h 9m
2026-07-20 RPA4476 - Jul 20, 14:55 UTCJul 20, 16:10 UTC1h 15m
2026-07-20 RPA4387 LGA → CLE Jul 20, 13:00 UTCJul 20, 14:05 UTC1h 5m
2026-07-20 RPA4424 PVD → DCA Jul 20, 10:25 UTCJul 20, 11:10 UTC45m
2026-07-20 RPA4634 JFK → BOS Jul 20, 02:40 UTCJul 20, 03:25 UTC45m

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 N122HQ page for operator, model, and routing details .

Mode-S A05BDE frequently asked

What is Mode-S code A05BDE?
A05BDE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N122HQ.
Where is Mode-S A05BDE registered?
Mode-S code A05BDE 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 A05BDE broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A05BDE, octal 50055736, decimal 10,509,278.
What flights does A05BDE operate?
Mode-S A05BDE has broadcast 20 distinct callsigns, including RPA4579, RPA4537, RPA4507, RPA4455, RPA4665.