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sensors Mode-S transponder

A9FC34

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N742YX · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
A9FC34
Octal
52376064
Decimal
11,140,148
Country
US
Tail
N742YX
Type
E75L
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
592
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A9FC34.

Country allocation

The ICAO 24-bit address A9FC34 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
RPA3707 - 9 2026-07-14
RPA3705 - 9 2026-07-12
RPA3519 - 8 2026-07-14
RPA3456 Republic Airlines 7 2026-06-05
RPA3450 - 7 2026-07-04
RPA3703 Republic Airlines 6 2026-07-20
RPA3653 - 6 2026-07-13
RPA3637 - 6 2026-06-18
RPA3400 - 6 2026-06-18
RPA3685 Republic Airlines 5 2026-06-06
RPA3677 Republic Airlines 5 2026-05-23
RPA3623 - 5 2026-06-27
RPA3548 - 5 2026-06-20
RPA3540 - 5 2026-06-28
RPA3539 Republic Airlines 5 2026-06-13
RPA3490 - 5 2026-07-12
RPA3439 - 5 2026-07-07
RPA3715 - 4 2026-06-20
RPA3709 Republic Airlines 4 2026-05-18
RPA3699 Republic Airlines 4 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3570 CHS → EWR Jul 26, 22:05 UTCJul 26, 23:00 UTC55m
2026-07-26 RPA3427 EWR → CVG Jul 26, 19:25 UTCJul 26, 20:05 UTC40m
2026-07-26 RPA3427 EWR → CVG Jul 26, 19:34 UTCJul 26, 19:49 UTC15m
2026-07-26 RPA3402 AVL → EWR Jul 26, 16:50 UTCJul 26, 18:05 UTC1h 15m
2026-07-26 RPA3590 EWR → GSP Jul 26, 13:35 UTCJul 26, 14:55 UTC1h 20m
2026-07-25 RPA3602 PHL → EWR Jul 25, 21:57 UTCJul 25, 23:09 UTC1h 12m
2026-07-25 RPA3602 PHL → EWR Jul 25, 21:55 UTCJul 25, 23:10 UTC1h 15m
2026-07-25 RPA3463 CVG → EWR Jul 25, 17:35 UTCJul 25, 19:35 UTC2h 0m
2026-07-25 RPA3462 ORD → CVG Jul 25, 13:17 UTCJul 25, 15:43 UTC2h 26m
2026-07-25 RPA3462 ORD → CVG Jul 25, 13:15 UTCJul 25, 15:20 UTC2h 5m
2026-07-25 RPA3438 BUF → EWR Jul 25, 10:05 UTCJul 25, 11:15 UTC1h 10m
2026-07-25 RPA3512 EWR → AVL Jul 25, 01:15 UTCJul 25, 02:55 UTC1h 40m
2026-07-24 RPA3691 ORF → EWR Jul 24, 22:05 UTCJul 24, 23:00 UTC55m
2026-07-24 RPA3509 EWR → BNA Jul 24, 19:20 UTCJul 24, 20:45 UTC1h 25m
2026-07-24 RPA3509 EWR → BNA Jul 24, 19:26 UTCJul 24, 20:43 UTC1h 17m
2026-07-24 RPA3663 EWR → ROC Jul 24, 14:50 UTCJul 24, 16:25 UTC1h 35m
2026-07-24 RPA3663 EWR → ROC Jul 24, 15:00 UTCJul 24, 16:10 UTC1h 10m
2026-07-24 RPA3612 CMH → EWR Jul 24, 12:30 UTCJul 24, 13:40 UTC1h 10m
2026-07-24 RPA3668 EWR → ATL Jul 24, 10:20 UTCJul 24, 11:00 UTC40m
2026-07-24 RPA3668 EWR → ATL Jul 24, 10:34 UTCJul 24, 11:12 UTC38m
2026-07-24 RPA3516 CVG → EWR Jul 24, 02:55 UTCJul 24, 03:50 UTC55m
2026-07-24 RPA3466 EWR → PWM Jul 24, 00:48 UTCJul 24, 01:52 UTC1h 4m
2026-07-24 RPA3466 EWR → PWM Jul 24, 00:55 UTCJul 24, 01:55 UTC1h 0m
2026-07-23 RPA3453 GSP → EWR Jul 23, 21:38 UTCJul 23, 22:43 UTC1h 5m
2026-07-23 RPA3453 GSP → EWR Jul 23, 21:40 UTCJul 23, 22:45 UTC1h 5m
2026-07-23 RPA3688 ORD → MCI Jul 23, 19:15 UTCJul 23, 20:05 UTC50m
2026-07-23 RPA3688 ORD → MCI Jul 23, 17:00 UTCJul 23, 17:40 UTC40m
2026-07-23 RPA3590 EWR → GSP Jul 23, 13:40 UTCJul 23, 15:10 UTC1h 30m
2026-07-23 RPA3590 EWR → GSP Jul 23, 13:39 UTCJul 23, 15:10 UTC1h 31m
2026-07-22 RPA3602 PHL → EWR Jul 22, 22:45 UTCJul 23, 00:05 UTC1h 20m
2026-07-22 RPA3688 ORD → MCI Jul 22, 20:35 UTCJul 22, 21:25 UTC50m
2026-07-22 RPA3698 RDU → EWR Jul 22, 18:10 UTCJul 22, 19:00 UTC50m
2026-07-22 RPA3401 BNA → EWR Jul 22, 11:10 UTCJul 22, 12:00 UTC50m
2026-07-21 RPA3646 MEM → EWR Jul 21, 16:05 UTCJul 21, 17:50 UTC1h 45m
2026-07-21 RPA3429 MEM → EWR Jul 21, 11:50 UTCJul 21, 13:05 UTC1h 15m
2026-07-21 RPA3429 MEM → EWR Jul 21, 11:18 UTCJul 21, 12:59 UTC1h 41m
2026-07-21 RPA3692 ITH → EWR Jul 21, 01:15 UTCJul 21, 02:30 UTC1h 15m
2026-07-20 RPA3573 DCA → EWR Jul 20, 17:35 UTCJul 20, 19:35 UTC2h 0m
2026-07-20 RPA3630 EWR → YUL Jul 20, 14:35 UTCJul 20, 16:40 UTC2h 5m
2026-07-20 RPA3703 YQB → EWR Jul 20, 11:25 UTCJul 20, 12:40 UTC1h 15m
2026-07-18 RPA3316 IAD → EWR Jul 18, 23:10 UTCJul 18, 23:40 UTC30m
2026-07-18 RPA3547 EWR → BOS Jul 18, 18:00 UTCJul 18, 20:03 UTC2h 3m
2026-07-18 RPA3547 EWR → BOS Jul 18, 18:30 UTCJul 18, 20:20 UTC1h 50m
2026-07-18 RPA3493 - Jul 18, 14:40 UTCJul 18, 15:40 UTC1h 0m
2026-07-18 RPA3498 - Jul 18, 12:50 UTCJul 18, 13:30 UTC40m
2026-07-18 RPA3524 - Jul 18, 09:35 UTCJul 18, 10:30 UTC55m
2026-07-18 RPA3524 CMH → ORD Jul 18, 09:48 UTCJul 18, 10:14 UTC26m
2026-07-18 RPA3692 - Jul 18, 03:00 UTCJul 18, 04:25 UTC1h 25m
2026-07-18 RPA3692 EWR → CMH Jul 18, 02:31 UTCJul 18, 04:26 UTC1h 55m
2026-07-17 RPA3699 EWR → ATL Jul 17, 22:55 UTCJul 18, 01:20 UTC2h 25m

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 N742YX page for operator, model, and routing details .

Mode-S A9FC34 frequently asked

What is Mode-S code A9FC34?
A9FC34 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N742YX.
Where is Mode-S A9FC34 registered?
Mode-S code A9FC34 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 A9FC34 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9FC34, octal 52376064, decimal 11,140,148.
What flights does A9FC34 operate?
Mode-S A9FC34 has broadcast 20 distinct callsigns, including RPA3707, RPA3705, RPA3519, RPA3456, RPA3450.