Apparatus

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sensors Mode-S transponder

A9A97F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N721YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A9A97F
Octal
52324577
Decimal
11,118,975
Country
US
Tail
N721YX
Type
E75L
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
604
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A9A97F.

Country allocation

The ICAO 24-bit address A9A97F 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
RPA3451 - 11 2026-07-08
RPA3610 - 7 2026-07-10
RPA3515 - 7 2026-06-25
RPA3435 - 7 2026-07-12
RPA3432 - 7 2026-07-19
RPA3698 - 6 2026-06-24
RPA3673 Republic Airlines 6 2026-07-26
RPA3662 - 6 2026-07-19
RPA3657 Republic Airlines 6 2026-07-23
RPA3635 - 6 2026-07-10
RPA3584 - 6 2026-07-07
RPA3533 Republic Airlines 6 2026-07-25
RPA3707 - 5 2026-07-15
RPA3705 - 5 2026-07-11
RPA3704 - 5 2026-07-07
RPA3685 Republic Airlines 5 2026-07-22
RPA3676 Republic Airlines 5 2026-05-31
RPA3638 Republic Airlines 5 2026-07-23
RPA3631 Republic Airlines 5 2026-07-24
RPA3623 Republic Airlines 5 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3562 SYR → EWR Jul 26, 21:20 UTCJul 26, 21:45 UTC25m
2026-07-26 RPA3568 EWR → GSP Jul 26, 17:10 UTCJul 26, 18:30 UTC1h 20m
2026-07-26 RPA3673 IAD → BTV Jul 26, 14:40 UTCJul 26, 15:45 UTC1h 5m
2026-07-26 RPA3706 EWR → YYZ Jul 26, 11:50 UTCJul 26, 13:00 UTC1h 10m
2026-07-26 RPA3592 BNA → EWR Jul 26, 02:19 UTCJul 26, 03:28 UTC1h 9m
2026-07-26 RPA3592 BNA → EWR Jul 26, 02:00 UTCJul 26, 03:20 UTC1h 20m
2026-07-25 RPA3468 CVG → EWR Jul 25, 22:30 UTCJul 25, 23:50 UTC1h 20m
2026-07-25 RPA3533 GSP → EWR Jul 25, 20:13 UTCJul 25, 21:39 UTC1h 26m
2026-07-25 RPA3533 GSP → EWR Jul 25, 20:00 UTCJul 25, 21:25 UTC1h 25m
2026-07-25 RPA3675 - Jul 25, 16:05 UTCJul 25, 17:55 UTC1h 50m
2026-07-25 RPA3608 EWR → PHL Jul 25, 12:45 UTCJul 25, 14:40 UTC1h 55m
2026-07-25 RPA3423 CMH → EWR Jul 25, 10:10 UTCJul 25, 11:45 UTC1h 35m
2026-07-25 RPA3667 SAV → EWR Jul 25, 01:10 UTCJul 25, 02:40 UTC1h 30m
2026-07-24 RPA3578 BNA → EWR Jul 24, 22:30 UTCJul 24, 23:30 UTC1h 0m
2026-07-24 RPA3591 SDF → EWR Jul 24, 20:27 UTCJul 24, 21:17 UTC50m
2026-07-24 RPA3591 SDF → EWR Jul 24, 20:10 UTCJul 24, 21:05 UTC55m
2026-07-24 RPA3443 EWR → DCA Jul 24, 17:05 UTCJul 24, 18:15 UTC1h 10m
2026-07-24 RPA3631 IAD → CMH Jul 24, 14:15 UTCJul 24, 15:30 UTC1h 15m
2026-07-24 RPA3673 IAD → BTV Jul 24, 11:40 UTCJul 24, 12:35 UTC55m
2026-07-24 RPA3540 EWR → CLT Jul 24, 02:48 UTCJul 24, 03:11 UTC23m
2026-07-24 RPA3540 EWR → CLT Jul 24, 02:35 UTCJul 24, 03:05 UTC30m
2026-07-23 RPA3582 ORF → EWR Jul 23, 23:20 UTCJul 24, 00:50 UTC1h 30m
2026-07-23 RPA3599 DFW → EWR Jul 23, 21:10 UTCJul 23, 21:55 UTC45m
2026-07-23 RPA3596 EWR → PIT Jul 23, 18:15 UTCJul 23, 19:35 UTC1h 20m
2026-07-23 RPA3638 JAX → EWR Jul 23, 15:10 UTCJul 23, 16:30 UTC1h 20m
2026-07-23 RPA3567 - Jul 23, 11:15 UTCJul 23, 12:50 UTC1h 35m
2026-07-23 RPA3567 IND → EWR Jul 23, 11:28 UTCJul 23, 12:46 UTC1h 18m
2026-07-23 RPA3660 RDU → EWR Jul 23, 03:20 UTCJul 23, 03:50 UTC30m
2026-07-23 RPA3657 SAV → EWR Jul 23, 01:20 UTCJul 23, 02:05 UTC45m
2026-07-23 RPA3657 SAV → EWR Jul 23, 01:19 UTCJul 23, 01:46 UTC27m
2026-07-22 RPA3585 IND → EWR Jul 22, 22:55 UTCJul 23, 00:35 UTC1h 40m
2026-07-22 RPA3459 - Jul 22, 18:55 UTCJul 22, 20:15 UTC1h 20m
2026-07-22 RPA3459 PWM → IAD Jul 22, 18:57 UTCJul 22, 20:13 UTC1h 16m
2026-07-22 RPA3685 YYZ → EWR Jul 22, 16:20 UTCJul 22, 17:15 UTC55m
2026-07-22 RPA3409 - Jul 22, 13:40 UTCJul 22, 14:50 UTC1h 10m
2026-07-21 RPA3475 ORD → DTW Jul 21, 02:45 UTCJul 21, 03:35 UTC50m
2026-07-21 RPA3657 SAV → EWR Jul 21, 00:45 UTCJul 21, 01:25 UTC40m
2026-07-21 RPA3657 SAV → EWR Jul 21, 00:54 UTCJul 21, 01:07 UTC13m
2026-07-20 RPA3585 IAD → IND Jul 20, 21:35 UTCJul 20, 22:45 UTC1h 10m
2026-07-20 RPA3303 - Jul 20, 18:10 UTCJul 20, 19:25 UTC1h 15m
2026-07-20 RPA3303 IND → IAD Jul 20, 18:14 UTCJul 20, 19:19 UTC1h 5m
2026-07-20 RPA3669 ROC → EWR Jul 20, 14:45 UTCJul 20, 16:20 UTC1h 35m
2026-07-20 RPA3458 - Jul 20, 11:05 UTCJul 20, 11:45 UTC40m
2026-07-20 RPA3458 CMH → EWR Jul 20, 10:58 UTCJul 20, 12:18 UTC1h 20m
2026-07-20 RPA3674 - Jul 20, 00:20 UTCJul 20, 01:05 UTC45m
2026-07-19 RPA3662 - Jul 19, 21:20 UTCJul 19, 22:25 UTC1h 5m
2026-07-19 RPA3432 - Jul 19, 18:55 UTCJul 19, 19:55 UTC1h 0m
2026-07-19 RPA3485 - Jul 19, 16:50 UTCJul 19, 17:45 UTC55m
2026-07-19 RPA3417 - Jul 19, 14:15 UTCJul 19, 15:45 UTC1h 30m
2026-07-18 RPA3604 - Jul 18, 10:10 UTCJul 18, 11:10 UTC1h 0m

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 N721YX page for operator, model, and routing details .

Mode-S A9A97F frequently asked

What is Mode-S code A9A97F?
A9A97F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N721YX.
Where is Mode-S A9A97F registered?
Mode-S code A9A97F 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 A9A97F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9A97F, octal 52324577, decimal 11,118,975.
What flights does A9A97F operate?
Mode-S A9A97F has broadcast 20 distinct callsigns, including RPA3451, RPA3610, RPA3515, RPA3435, RPA3432.