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sensors Mode-S transponder

A05827

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N121HQ · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A05827
Octal
50054047
Decimal
10,508,327
Country
US
Tail
N121HQ
Type
E75L
Broadcasting now · callsign RPA4807 · 31,000 ft
Flights observed
692
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Current position

A05827 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A05827 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
RPA4666 - 8 2026-07-20
RPA4397 Republic Airlines 8 2026-07-24
RPA4496 Republic Airlines 7 2026-07-06
RPA4494 Republic Airlines 7 2026-07-24
RPA4462 - 7 2026-06-30
RPA4808 Republic Airlines 6 2026-07-26
RPA4711 - 6 2026-07-15
RPA4649 Republic Airlines 6 2026-07-25
RPA4501 - 6 2026-07-08
RPA4419 Republic Airlines 6 2026-04-29
RPA4417 Republic Airlines 6 2026-05-15
RPA4385 Republic Airlines 6 2026-07-26
RPA4368 Republic Airlines 6 2026-07-26
RPA4363 Republic Airlines 6 2026-07-25
RPA4775 Republic Airlines 5 2026-04-29
RPA4747 Republic Airlines 5 2026-06-02
RPA4734 Republic Airlines 5 2026-07-19
RPA4720 - 5 2026-06-27
RPA4685 Republic Airlines 5 2026-05-28
RPA4681 - 5 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4368 JFK → BOS Jul 26, 18:55 UTCJul 26, 20:55 UTC2h 0m
2026-07-26 RPA4385 ORD → CHS Jul 26, 16:10 UTCJul 26, 17:45 UTC1h 35m
2026-07-26 RPA4808 JFK → RDU Jul 26, 13:15 UTCJul 26, 14:45 UTC1h 30m
2026-07-26 RPA4361 BTV → DCA Jul 26, 02:05 UTCJul 26, 03:10 UTC1h 5m
2026-07-25 RPA4545 RDU → LGA Jul 25, 20:15 UTCJul 25, 21:05 UTC50m
2026-07-25 RPA4545 RDU → LGA Jul 25, 20:09 UTCJul 25, 21:09 UTC1h 0m
2026-07-25 RPA4545 RDU → LGA Jul 25, 18:15 UTCJul 25, 19:00 UTC45m
2026-07-25 RPA4602 CLE → JFK Jul 25, 15:10 UTCJul 25, 16:15 UTC1h 5m
2026-07-25 RPA4649 PHL → ATL Jul 25, 13:25 UTCJul 25, 14:20 UTC55m
2026-07-25 RPA4649 PHL → ATL Jul 25, 13:20 UTCJul 25, 14:18 UTC58m
2026-07-25 RPA4626 OMA → ORD Jul 25, 10:10 UTCJul 25, 11:20 UTC1h 10m
2026-07-25 RPA4363 JFK → CVG Jul 25, 03:45 UTCJul 25, 04:20 UTC35m
2026-07-24 RPA4774 PVD → DCA Jul 24, 23:35 UTCJul 25, 01:50 UTC2h 15m
2026-07-24 RPA4774 PVD → DCA Jul 24, 20:30 UTCJul 24, 22:10 UTC1h 40m
2026-07-24 RPA4409 BOS → DCA Jul 24, 18:25 UTCJul 24, 18:50 UTC25m
2026-07-24 RPA4409 BOS → DCA Jul 24, 17:05 UTCJul 24, 17:20 UTC15m
2026-07-24 RPA4633 LGA → ORD Jul 24, 13:20 UTCJul 24, 15:00 UTC1h 40m
2026-07-24 RPA4494 BOS → DCA Jul 24, 10:35 UTCJul 24, 11:50 UTC1h 15m
2026-07-24 RPA4397 PWM → DCA Jul 24, 02:00 UTCJul 24, 02:40 UTC40m
2026-07-24 RPA4346 LGA → STL Jul 24, 00:20 UTCJul 24, 01:00 UTC40m
2026-07-23 RPA4359 MCI → LGA Jul 23, 21:50 UTCJul 23, 22:40 UTC50m
2026-07-23 RPA4359 MCI → LGA Jul 23, 21:47 UTCJul 23, 22:39 UTC52m
2026-07-23 RPA4359 MCI → LGA Jul 23, 20:00 UTCJul 23, 21:00 UTC1h 0m
2026-07-23 RPA4592 LGA → MCI Jul 23, 16:35 UTCJul 23, 18:15 UTC1h 40m
2026-07-23 RPA4701 DCA → IND Jul 23, 13:55 UTCJul 23, 15:15 UTC1h 20m
2026-07-23 RPA4580 BOS → JFK Jul 23, 11:10 UTCJul 23, 12:25 UTC1h 15m
2026-07-23 RPA4541 DCA → MHT Jul 23, 01:33 UTCJul 23, 02:52 UTC1h 19m
2026-07-23 RPA4541 DCA → MHT Jul 23, 01:35 UTCJul 23, 02:55 UTC1h 20m
2026-07-22 RPA4572 SDF → ORD Jul 22, 22:55 UTCJul 23, 00:10 UTC1h 15m
2026-07-22 RPA4572 SDF → ORD Jul 22, 21:05 UTCJul 22, 22:05 UTC1h 0m
2026-07-22 RPA4523 LGA → MSP Jul 22, 17:55 UTCJul 22, 19:25 UTC1h 30m
2026-07-22 RPA4523 LGA → MSP Jul 22, 17:54 UTCJul 22, 19:23 UTC1h 29m
2026-07-22 RPA4523 LGA → MSP Jul 22, 15:15 UTCJul 22, 17:10 UTC1h 55m
2026-07-22 RPA4737 DCA → BOS Jul 22, 12:55 UTCJul 22, 13:45 UTC50m
2026-07-22 RPA4737 DCA → BOS Jul 22, 12:53 UTCJul 22, 13:45 UTC52m
2026-07-22 RPA4737 DCA → BOS Jul 22, 11:10 UTCJul 22, 11:50 UTC40m
2026-07-21 RPA4809 JFK → CVG Jul 21, 16:15 UTCJul 21, 17:45 UTC1h 30m
2026-07-21 RPA4809 JFK → CVG Jul 21, 16:13 UTCJul 21, 17:42 UTC1h 29m
2026-07-21 RPA4356 JFK → ORD Jul 21, 12:50 UTCJul 21, 15:05 UTC2h 15m
2026-07-21 RPA4805 - Jul 21, 10:00 UTCJul 21, 11:05 UTC1h 5m
2026-07-21 RPA4573 JFK → RDU Jul 21, 03:10 UTCJul 21, 04:19 UTC1h 9m
2026-07-21 RPA4573 - Jul 21, 03:10 UTCJul 21, 04:20 UTC1h 10m
2026-07-21 RPA4474 DCA → JFK Jul 21, 00:10 UTCJul 21, 00:55 UTC45m
2026-07-20 RPA4452 PVD → DCA Jul 20, 21:30 UTCJul 20, 22:40 UTC1h 10m
2026-07-20 RPA4636 BOS → DCA Jul 20, 18:00 UTCJul 20, 19:55 UTC1h 55m
2026-07-20 RPA4636 BOS → DCA Jul 20, 17:59 UTCJul 20, 19:48 UTC1h 49m
2026-07-20 RPA4666 BUF → BOS Jul 20, 15:55 UTCJul 20, 17:00 UTC1h 5m
2026-07-20 RPA4666 BUF → BOS Jul 20, 15:55 UTCJul 20, 16:58 UTC1h 3m
2026-07-20 RPA4666 BOS → BUF Jul 20, 13:45 UTCJul 20, 14:50 UTC1h 5m
2026-07-20 RPA4788 - Jul 20, 11:20 UTCJul 20, 11:45 UTC25m

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 N121HQ page for operator, model, and routing details .

Mode-S A05827 frequently asked

What is Mode-S code A05827?
A05827 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N121HQ.
Where is Mode-S A05827 registered?
Mode-S code A05827 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 A05827 broadcasting right now?
Yes. Mode-S A05827 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A05827, octal 50054047, decimal 10,508,327.
What flights does A05827 operate?
Mode-S A05827 has broadcast 20 distinct callsigns, including RPA4666, RPA4397, RPA4496, RPA4494, RPA4462.