Apparatus

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sensors Mode-S transponder

AA6EFA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N771YX · operated by REPUBLIC AIRWAYS INC

Hex
AA6EFA
Octal
52467372
Decimal
11,169,530
Country
US
Tail
N771YX
Type
E75L
No current signal · last broadcast Jul 26, 20:20 UTC
Flights observed
660
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:20 UTC

Last known position

Most recent position reported by Mode-S AA6EFA.

Country allocation

The ICAO 24-bit address AA6EFA 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
RPA3422 Republic Airlines 11 2026-07-21
RPA3443 - 9 2026-07-05
RPA3695 - 8 2026-07-15
RPA3558 - 8 2026-07-16
RPA3673 - 7 2026-06-23
RPA3591 - 7 2026-07-16
RPA3510 - 7 2026-07-10
RPA3523 Republic Airlines 6 2026-07-19
RPA3406 - 6 2026-07-04
RPA3702 - 5 2026-07-08
RPA3691 - 5 2026-07-13
RPA3678 - 5 2026-07-12
RPA3656 - 5 2026-07-16
RPA3637 Republic Airlines 5 2026-06-12
RPA3549 Republic Airlines 5 2026-06-26
RPA3509 - 5 2026-07-13
RPA3494 Republic Airlines 5 2026-06-09
RPA3478 Republic Airlines 5 2026-07-22
RPA3470 Republic Airlines 5 2026-07-19
RPA3429 Republic Airlines 5 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3456 IAD → IND Jul 26, 19:25 UTCJul 26, 20:20 UTC55m
2026-07-26 RPA3456 IAD → IND Jul 26, 19:19 UTCJul 26, 20:14 UTC55m
2026-07-26 RPA3537 EWR → BUF Jul 26, 17:15 UTCJul 26, 17:55 UTC40m
2026-07-26 RPA3451 MKE → EWR Jul 26, 13:10 UTCJul 26, 14:45 UTC1h 35m
2026-07-26 RPA3683 DCA → EWR Jul 26, 10:36 UTCJul 26, 11:56 UTC1h 20m
2026-07-26 RPA3683 DCA → EWR Jul 26, 10:25 UTCJul 26, 12:00 UTC1h 35m
2026-07-25 RPA3609 YOW → EWR Jul 25, 16:20 UTCJul 25, 18:05 UTC1h 45m
2026-07-25 RPA3609 YOW → EWR Jul 25, 16:08 UTCJul 25, 18:06 UTC1h 58m
2026-07-25 RPA3697 EWR → CMH Jul 25, 13:05 UTCJul 25, 14:50 UTC1h 45m
2026-07-25 RPA3718 EWR → MSP Jul 25, 10:20 UTCJul 25, 11:45 UTC1h 25m
2026-07-25 RPA3718 EWR → MSP Jul 25, 10:22 UTCJul 25, 11:42 UTC1h 20m
2026-07-24 RPA3580 SDF → EWR Jul 24, 23:40 UTCJul 25, 01:05 UTC1h 25m
2026-07-24 RPA3666 CMH → EWR Jul 24, 21:15 UTCJul 24, 22:30 UTC1h 15m
2026-07-24 RPA3666 CMH → EWR Jul 24, 21:04 UTCJul 24, 22:26 UTC1h 22m
2026-07-24 RPA3437 BUF → EWR Jul 24, 18:15 UTCJul 24, 19:35 UTC1h 20m
2026-07-24 RPA3645 PHL → EWR Jul 24, 15:20 UTCJul 24, 16:55 UTC1h 35m
2026-07-24 RPA3561 ORD → MSY Jul 24, 12:45 UTCJul 24, 14:05 UTC1h 20m
2026-07-24 RPA3679 BNA → EWR Jul 24, 10:20 UTCJul 24, 11:00 UTC40m
2026-07-24 RPA3464 BUF → EWR Jul 24, 03:00 UTCJul 24, 04:00 UTC1h 0m
2026-07-24 RPA3444 EWR → GSO Jul 24, 00:00 UTCJul 24, 01:00 UTC1h 0m
2026-07-24 RPA3444 EWR → GSO Jul 24, 00:12 UTCJul 24, 01:11 UTC59m
2026-07-23 RPA3570 CHS → EWR Jul 23, 22:15 UTCJul 23, 23:00 UTC45m
2026-07-23 RPA3427 EWR → CVG Jul 23, 19:30 UTCJul 23, 20:10 UTC40m
2026-07-23 RPA3402 AVL → EWR Jul 23, 17:20 UTCJul 23, 18:40 UTC1h 20m
2026-07-23 RPA3402 AVL → EWR Jul 23, 14:25 UTCJul 23, 15:45 UTC1h 20m
2026-07-23 RPA3410 ORD → MSN Jul 23, 12:35 UTCJul 23, 13:20 UTC45m
2026-07-23 RPA3410 ORD → MSN Jul 23, 12:33 UTCJul 23, 13:19 UTC46m
2026-07-23 RPA3491 BUF → EWR Jul 23, 00:55 UTCJul 23, 01:50 UTC55m
2026-07-22 RPA3478 EWR → ILM Jul 22, 22:19 UTCJul 22, 23:43 UTC1h 24m
2026-07-22 RPA3478 EWR → ILM Jul 22, 22:45 UTCJul 22, 23:40 UTC55m
2026-07-22 RPA3686 - Jul 22, 19:45 UTCJul 22, 20:50 UTC1h 5m
2026-07-22 RPA3457 EWR → ATL Jul 22, 16:10 UTCJul 22, 17:35 UTC1h 25m
2026-07-22 RPA3600 PHL → EWR Jul 22, 11:10 UTCJul 22, 12:25 UTC1h 15m
2026-07-22 RPA3670 EWR → GSP Jul 22, 00:00 UTCJul 22, 01:50 UTC1h 50m
2026-07-21 RPA3575 GSP → EWR Jul 21, 20:35 UTCJul 21, 21:30 UTC55m
2026-07-21 RPA3575 GSP → EWR Jul 21, 20:31 UTCJul 21, 21:12 UTC41m
2026-07-21 RPA3422 EWR → CLT Jul 21, 14:40 UTCJul 21, 15:45 UTC1h 5m
2026-07-21 RPA3422 EWR → CLT Jul 21, 11:35 UTCJul 21, 12:40 UTC1h 5m
2026-07-21 RPA3659 GSO → EWR Jul 21, 03:05 UTCJul 21, 04:00 UTC55m
2026-07-21 RPA3659 GSO → EWR Jul 21, 02:58 UTCJul 21, 03:55 UTC57m
2026-07-20 RPA3597 SRQ → EWR Jul 20, 22:55 UTCJul 21, 01:20 UTC2h 24m
2026-07-20 RPA3597 SRQ → EWR Jul 20, 22:47 UTCJul 21, 01:01 UTC2h 14m
2026-07-20 RPA3658 GRR → EWR Jul 20, 19:40 UTCJul 20, 21:25 UTC1h 45m
2026-07-20 RPA3595 SDF → EWR Jul 20, 15:35 UTCJul 20, 17:15 UTC1h 40m
2026-07-19 RPA3523 MSY → EWR Jul 19, 23:40 UTCJul 20, 01:05 UTC1h 25m
2026-07-19 RPA3442 IND → EWR Jul 19, 19:25 UTCJul 19, 21:30 UTC2h 5m
2026-07-19 RPA3504 EWR → EYW Jul 19, 16:50 UTCJul 19, 18:15 UTC1h 25m
2026-07-19 RPA3504 EWR → EYW Jul 19, 16:32 UTCJul 19, 18:00 UTC1h 28m
2026-07-19 RPA3470 EWR → JAX Jul 19, 13:49 UTCJul 19, 15:12 UTC1h 23m
2026-07-19 RPA3470 EWR → JAX Jul 19, 13:30 UTCJul 19, 15:20 UTC1h 50m

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 N771YX page for operator, model, and routing details .

Mode-S AA6EFA frequently asked

What is Mode-S code AA6EFA?
AA6EFA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N771YX.
Where is Mode-S AA6EFA registered?
Mode-S code AA6EFA 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 AA6EFA broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA6EFA, octal 52467372, decimal 11,169,530.
What flights does AA6EFA operate?
Mode-S AA6EFA has broadcast 20 distinct callsigns, including RPA3422, RPA3443, RPA3695, RPA3558, RPA3673.