Apparatus

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sensors Mode-S transponder

AA1C45

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N750YX · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
AA1C45
Octal
52416105
Decimal
11,148,357
Country
US
Tail
N750YX
Type
E75L
Broadcasting now · callsign RPA3606 · 34,000 ft
Flights observed
695
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:55 UTC

Current position

AA1C45 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AA1C45 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
RPA3486 Republic Airlines 11 2026-07-26
RPA3705 - 10 2026-07-17
RPA3591 Republic Airlines 9 2026-07-25
RPA3468 - 8 2026-07-14
RPA3423 Republic Airlines 8 2026-07-26
RPA3696 - 7 2026-07-01
RPA3667 Republic Airlines 7 2026-07-26
RPA3509 - 7 2026-06-26
RPA3417 - 7 2026-07-17
RPA3412 - 7 2026-07-17
RPA3715 - 6 2026-07-15
RPA3652 Republic Airlines 6 2026-07-17
RPA3648 Republic Airlines 6 2026-06-15
RPA3646 - 6 2026-07-20
RPA3618 Republic Airlines 6 2026-05-10
RPA3581 - 6 2026-06-28
RPA3577 - 6 2026-06-24
RPA3533 - 6 2026-07-14
RPA3485 - 6 2026-06-24
RPA3484 Republic Airlines 6 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3556 CVG → ORD Jul 26, 18:50 UTCJul 26, 20:55 UTC2h 5m
2026-07-26 RPA3557 EWR → YYZ Jul 26, 16:20 UTCJul 26, 17:40 UTC1h 20m
2026-07-26 RPA3486 EWR → DCA Jul 26, 13:25 UTCJul 26, 14:55 UTC1h 30m
2026-07-26 RPA3423 CMH → EWR Jul 26, 10:20 UTCJul 26, 11:50 UTC1h 30m
2026-07-26 RPA3667 SAV → EWR Jul 26, 01:50 UTCJul 26, 03:20 UTC1h 30m
2026-07-26 RPA3578 BNA → EWR Jul 26, 00:10 UTCJul 26, 01:05 UTC55m
2026-07-25 RPA3591 SDF → EWR Jul 25, 20:10 UTCJul 25, 21:05 UTC55m
2026-07-25 RPA3443 EWR → DCA Jul 25, 16:50 UTCJul 25, 17:55 UTC1h 5m
2026-07-25 RPA3443 EWR → DCA Jul 25, 16:57 UTCJul 25, 17:46 UTC49m
2026-07-25 RPA3631 IAD → CMH Jul 25, 14:30 UTCJul 25, 15:40 UTC1h 10m
2026-07-25 RPA3673 IAD → BTV Jul 25, 11:30 UTCJul 25, 12:30 UTC1h 0m
2026-07-25 RPA3673 IAD → BTV Jul 25, 11:41 UTCJul 25, 12:14 UTC33m
2026-07-25 RPA3477 EWR → SAV Jul 25, 02:10 UTCJul 25, 03:10 UTC1h 0m
2026-07-24 RPA3714 EWR → ROC Jul 24, 22:55 UTCJul 25, 00:15 UTC1h 20m
2026-07-24 RPA3589 ROC → EWR Jul 24, 20:35 UTCJul 24, 21:50 UTC1h 15m
2026-07-24 RPA3609 YOW → EWR Jul 24, 16:25 UTCJul 24, 18:05 UTC1h 40m
2026-07-24 RPA3697 EWR → CMH Jul 24, 13:10 UTCJul 24, 15:05 UTC1h 55m
2026-07-24 RPA3718 EWR → MSP Jul 24, 10:15 UTCJul 24, 11:40 UTC1h 25m
2026-07-24 RPA3580 SDF → EWR Jul 24, 01:10 UTCJul 24, 02:40 UTC1h 30m
2026-07-23 RPA3522 GSO → EWR Jul 23, 20:40 UTCJul 23, 23:00 UTC2h 20m
2026-07-23 RPA3528 EWR → BUF Jul 23, 17:30 UTCJul 23, 19:40 UTC2h 10m
2026-07-23 RPA3493 PIT → EWR Jul 23, 14:25 UTCJul 23, 15:25 UTC1h 0m
2026-07-23 RPA3493 PIT → EWR Jul 23, 14:32 UTCJul 23, 15:26 UTC54m
2026-07-23 RPA3498 CMH → EWR Jul 23, 12:10 UTCJul 23, 12:55 UTC45m
2026-07-23 RPA3524 EWR → MKE Jul 23, 09:35 UTCJul 23, 10:35 UTC1h 0m
2026-07-23 RPA3524 EWR → MKE Jul 23, 09:48 UTCJul 23, 10:15 UTC27m
2026-07-23 RPA3614 STL → EWR Jul 23, 01:00 UTCJul 23, 01:45 UTC45m
2026-07-22 RPA3635 IAD → LGA Jul 22, 21:35 UTCJul 22, 23:25 UTC1h 50m
2026-07-22 RPA3610 CHS → EWR Jul 22, 19:00 UTCJul 22, 19:50 UTC50m
2026-07-22 RPA3557 - Jul 22, 16:10 UTCJul 22, 17:35 UTC1h 25m
2026-07-22 RPA3486 EWR → DCA Jul 22, 13:30 UTCJul 22, 15:05 UTC1h 35m
2026-07-22 RPA3486 EWR → DCA Jul 22, 13:30 UTCJul 22, 15:05 UTC1h 35m
2026-07-22 RPA3423 CMH → EWR Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-21 RPA3326 SYR → HHH Jul 21, 15:25 UTCJul 21, 17:30 UTC2h 5m
2026-07-21 RPA3326 SYR → HHH Jul 21, 15:19 UTCJul 21, 17:32 UTC2h 13m
2026-07-21 RPA3505 EWR → BGR Jul 21, 13:10 UTCJul 21, 14:15 UTC1h 5m
2026-07-21 RPA3505 EWR → BGR Jul 21, 13:11 UTCJul 21, 14:14 UTC1h 3m
2026-07-21 RPA3561 ORD → MSY Jul 21, 10:20 UTCJul 21, 11:30 UTC1h 10m
2026-07-21 RPA3569 - Jul 21, 02:30 UTCJul 21, 03:35 UTC1h 5m
2026-07-20 RPA3677 MSN → ORD Jul 20, 23:50 UTCJul 21, 01:05 UTC1h 14m
2026-07-20 RPA3546 YYZ → EWR Jul 20, 21:45 UTCJul 20, 22:55 UTC1h 10m
2026-07-20 RPA3546 YYZ → EWR Jul 20, 21:42 UTCJul 20, 22:45 UTC1h 3m
2026-07-20 RPA3401 BNA → EWR Jul 20, 19:10 UTCJul 20, 20:20 UTC1h 10m
2026-07-20 RPA3646 ORD → CHS Jul 20, 16:08 UTCJul 20, 17:34 UTC1h 26m
2026-07-20 RPA3646 - Jul 20, 16:05 UTCJul 20, 17:35 UTC1h 30m
2026-07-20 RPA3497 CHS → EWR Jul 20, 13:25 UTCJul 20, 14:25 UTC1h 0m
2026-07-20 RPA3667 EWR → CVG Jul 20, 04:03 UTCJul 20, 05:26 UTC1h 23m
2026-07-20 RPA3667 EWR → CVG Jul 20, 04:00 UTCJul 20, 05:30 UTC1h 30m
2026-07-20 RPA3578 BNA → EWR Jul 20, 01:10 UTCJul 20, 02:05 UTC55m
2026-07-19 RPA3315 IND → CVG Jul 19, 03:35 UTCJul 19, 04:20 UTC45m

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 N750YX page for operator, model, and routing details .

Mode-S AA1C45 frequently asked

What is Mode-S code AA1C45?
AA1C45 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N750YX.
Where is Mode-S AA1C45 registered?
Mode-S code AA1C45 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 AA1C45 broadcasting right now?
Yes. Mode-S AA1C45 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA1C45, octal 52416105, decimal 11,148,357.
What flights does AA1C45 operate?
Mode-S AA1C45 has broadcast 20 distinct callsigns, including RPA3486, RPA3705, RPA3591, RPA3468, RPA3423.