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sensors Mode-S transponder

A9BFC9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N727YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A9BFC9
Octal
52337711
Decimal
11,124,681
Country
US
Tail
N727YX
Type
E75L
Broadcasting now · callsign RPA3673 · 32,000 ft
Flights observed
644
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Current position

A9BFC9 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9BFC9 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 - 9 2026-07-13
RPA3415 - 9 2026-06-15
RPA3566 Republic Airlines 8 2026-06-09
RPA3626 - 7 2026-07-10
RPA3592 - 7 2026-07-04
RPA3575 - 7 2026-07-13
RPA3441 - 7 2026-06-23
RPA3714 - 6 2026-07-08
RPA3706 - 6 2026-07-04
RPA3674 - 6 2026-07-15
RPA3673 - 6 2026-07-04
RPA3613 - 6 2026-07-12
RPA3589 - 6 2026-07-08
RPA3568 - 6 2026-07-04
RPA3554 - 6 2026-06-25
RPA3542 - 6 2026-07-15
RPA3514 - 6 2026-07-17
RPA3286 Republic Airlines 6 2026-07-22
RPA3675 Republic Airlines 5 2026-07-26
RPA3624 Republic Airlines 5 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3607 EWR → MSN Jul 26, 20:45 UTCJul 26, 21:40 UTC55m
2026-07-26 RPA3675 SDF → EWR Jul 26, 16:15 UTCJul 26, 18:00 UTC1h 45m
2026-07-26 RPA3608 EWR → PHL Jul 26, 12:55 UTCJul 26, 15:00 UTC2h 5m
2026-07-26 RPA3641 MSN → EWR Jul 26, 10:25 UTCJul 26, 11:20 UTC55m
2026-07-26 RPA3460 YYZ → EWR Jul 26, 01:30 UTCJul 26, 02:15 UTC45m
2026-07-26 RPA3460 YYZ → EWR Jul 26, 01:39 UTCJul 26, 02:15 UTC36m
2026-07-25 RPA3719 IND → EWR Jul 25, 23:50 UTCJul 26, 00:40 UTC50m
2026-07-25 RPA3615 ORF → EWR Jul 25, 19:45 UTCJul 25, 20:50 UTC1h 5m
2026-07-25 RPA3413 EWR → CMH Jul 25, 16:40 UTCJul 25, 17:55 UTC1h 15m
2026-07-25 RPA3552 IAD → BOS Jul 25, 14:10 UTCJul 25, 15:15 UTC1h 5m
2026-07-24 RPA3582 ORF → EWR Jul 24, 23:25 UTCJul 25, 00:45 UTC1h 20m
2026-07-24 RPA3599 DFW → EWR Jul 24, 21:26 UTCJul 24, 22:09 UTC43m
2026-07-24 RPA3599 DFW → EWR Jul 24, 21:20 UTCJul 24, 22:05 UTC45m
2026-07-24 RPA3447 IAD → JAX Jul 24, 17:40 UTCJul 24, 19:20 UTC1h 40m
2026-07-24 RPA3676 - Jul 24, 14:55 UTCJul 24, 16:25 UTC1h 30m
2026-07-24 RPA3482 DCA → EWR Jul 24, 11:51 UTCJul 24, 13:22 UTC1h 31m
2026-07-23 RPA3620 ORF → EWR Jul 23, 23:20 UTCJul 24, 01:25 UTC2h 5m
2026-07-23 RPA3404 BOS → EWR Jul 23, 20:05 UTCJul 23, 20:55 UTC50m
2026-07-23 RPA3558 PHL → ORD Jul 23, 18:15 UTCJul 23, 19:00 UTC45m
2026-07-23 RPA3558 PHL → ORD Jul 23, 18:10 UTCJul 23, 19:01 UTC51m
2026-07-23 RPA3591 SDF → EWR Jul 23, 15:30 UTCJul 23, 16:25 UTC55m
2026-07-23 RPA3505 EWR → BGR Jul 23, 12:55 UTCJul 23, 14:00 UTC1h 5m
2026-07-22 RPA3286 IAD → EWR Jul 22, 14:25 UTCJul 22, 15:25 UTC1h 0m
2026-07-22 RPA3286 IAD → EWR Jul 22, 13:53 UTCJul 22, 15:29 UTC1h 36m
2026-07-21 RPA3286 IAD → EWR Jul 21, 19:15 UTCJul 21, 20:20 UTC1h 5m
2026-07-21 RPA4097 CMH → IAD Jul 21, 13:00 UTCJul 21, 13:45 UTC45m
2026-07-20 RPA4095 EWR → PIT Jul 20, 22:40 UTCJul 20, 23:45 UTC1h 5m
2026-07-20 RPA4095 EWR → PIT Jul 20, 22:18 UTCJul 20, 23:47 UTC1h 29m
2026-07-20 RPA3526 IAD → IAD Jul 20, 14:00 UTCJul 20, 14:30 UTC30m
2026-07-20 RPA3561 ORD → MSY Jul 20, 11:30 UTCJul 20, 12:40 UTC1h 10m
2026-07-20 RPA3569 IAD → YOW Jul 20, 02:33 UTCJul 20, 03:42 UTC1h 9m
2026-07-20 RPA3569 - Jul 20, 02:35 UTCJul 20, 03:45 UTC1h 10m
2026-07-20 RPA3445 EWR → MKE Jul 20, 00:00 UTCJul 20, 01:20 UTC1h 20m
2026-07-20 RPA3445 EWR → MKE Jul 20, 00:03 UTCJul 20, 01:51 UTC1h 48m
2026-07-19 RPA3418 ORD → IND Jul 19, 22:30 UTCJul 19, 23:05 UTC35m
2026-07-19 RPA3494 - Jul 19, 20:40 UTCJul 19, 20:55 UTC15m
2026-07-19 RPA3494 ROC → ORD Jul 19, 19:35 UTCJul 19, 20:23 UTC48m
2026-07-19 RPA3494 ROC → ORD Jul 19, 19:20 UTCJul 19, 20:55 UTC1h 35m
2026-07-19 RPA3629 - Jul 19, 17:10 UTCJul 19, 18:20 UTC1h 10m
2026-07-19 RPA3629 ORD → ROC Jul 19, 17:23 UTCJul 19, 18:16 UTC53m
2026-07-19 RPA3534 - Jul 19, 15:15 UTCJul 19, 16:00 UTC45m
2026-07-19 RPA3534 IND → ORD Jul 19, 15:00 UTCJul 19, 15:43 UTC43m
2026-07-19 RPA3323 MDT → CMH Jul 19, 00:40 UTCJul 19, 01:35 UTC55m
2026-07-19 RPA3323 MDT → CMH Jul 19, 00:23 UTCJul 19, 01:35 UTC1h 12m
2026-07-18 RPA3588 EWR → PVD Jul 18, 21:55 UTCJul 18, 23:25 UTC1h 30m
2026-07-18 RPA3567 - Jul 18, 11:50 UTCJul 18, 13:20 UTC1h 30m
2026-07-18 RPA3660 ORD → IND Jul 18, 04:15 UTCJul 18, 04:45 UTC30m
2026-07-18 RPA3657 - Jul 18, 01:39 UTCJul 18, 02:14 UTC35m
2026-07-18 RPA3657 IND → ORD Jul 18, 01:19 UTCJul 18, 02:23 UTC1h 4m
2026-07-17 RPA3585 IAD → IND Jul 17, 22:45 UTCJul 18, 00:00 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 N727YX page for operator, model, and routing details .

Mode-S A9BFC9 frequently asked

What is Mode-S code A9BFC9?
A9BFC9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N727YX.
Where is Mode-S A9BFC9 registered?
Mode-S code A9BFC9 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 A9BFC9 broadcasting right now?
Yes. Mode-S A9BFC9 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9BFC9, octal 52337711, decimal 11,124,681.
What flights does A9BFC9 operate?
Mode-S A9BFC9 has broadcast 20 distinct callsigns, including RPA3422, RPA3415, RPA3566, RPA3626, RPA3592.