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sensors Mode-S transponder

AA818D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N776YX · EMBRAER ERJ-170-100 · operated by REPUBLIC AIRWAYS INC

Hex
AA818D
Octal
52500615
Decimal
11,174,285
Country
US
Tail
N776YX
Type
E170
No current signal · last broadcast 4h ago
Flights observed
621
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S AA818D.

Country allocation

The ICAO 24-bit address AA818D 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
RPA3579 - 9 2026-06-16
RPA3448 - 9 2026-07-07
RPA3635 - 7 2026-07-05
RPA3614 - 7 2026-07-06
RPA3564 - 7 2026-07-13
RPA3558 Republic Airlines 7 2026-06-17
RPA3498 - 7 2026-07-03
RPA3701 - 6 2026-07-13
RPA3528 - 6 2026-07-03
RPA3522 - 6 2026-07-04
RPA3493 - 6 2026-07-03
RPA3460 - 6 2026-07-12
RPA3707 Republic Airlines 5 2026-05-16
RPA3705 Republic Airlines 5 2026-06-01
RPA3597 - 5 2026-07-10
RPA3581 - 5 2026-06-21
RPA3556 - 5 2026-07-13
RPA3541 Republic Airlines 5 2026-05-12
RPA3487 Republic Airlines 5 2026-06-04
RPA3475 Republic Airlines 5 2026-06-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 RPA3564 STL → EWR Jul 13, 22:15 UTCJul 14, 00:25 UTC2h 10m
2026-07-13 RPA3556 EWR → STL Jul 13, 18:45 UTCJul 13, 20:40 UTC1h 55m
2026-07-13 RPA3556 EWR → STL Jul 13, 18:43 UTCJul 13, 20:35 UTC1h 52m
2026-07-13 RPA3701 BGR → EWR Jul 13, 15:50 UTCJul 13, 17:10 UTC1h 20m
2026-07-13 RPA3423 EWR → BGR Jul 13, 13:40 UTCJul 13, 14:40 UTC1h 0m
2026-07-13 RPA3503 - Jul 13, 10:15 UTCJul 13, 11:55 UTC1h 40m
2026-07-13 RPA3428 EWR → YHZ Jul 13, 01:10 UTCJul 13, 02:22 UTC1h 12m
2026-07-13 RPA3428 - Jul 13, 01:01 UTCJul 13, 02:25 UTC1h 25m
2026-07-12 RPA3654 - Jul 12, 21:55 UTCJul 12, 23:00 UTC1h 5m
2026-07-12 RPA3654 ORF → EWR Jul 12, 22:00 UTCJul 12, 22:59 UTC59m
2026-07-12 RPA3603 EWR → ORF Jul 12, 19:55 UTCJul 12, 20:41 UTC46m
2026-07-12 RPA3675 - Jul 12, 16:01 UTCJul 12, 17:45 UTC1h 45m
2026-07-12 RPA3608 - Jul 12, 12:50 UTCJul 12, 14:45 UTC1h 55m
2026-07-12 RPA3641 BOS → EWR Jul 12, 10:25 UTCJul 12, 11:20 UTC55m
2026-07-12 RPA3460 EWR → BOS Jul 12, 01:05 UTCJul 12, 01:58 UTC53m
2026-07-12 RPA3460 EWR → BOS Jul 12, 01:25 UTCJul 12, 02:01 UTC35m
2026-07-11 RPA3719 - Jul 11, 22:40 UTCJul 11, 23:35 UTC55m
2026-07-11 RPA776 EWR → BOS Jul 11, 20:25 UTCJul 11, 21:05 UTC40m
2026-07-11 RPA3568 - Jul 11, 16:45 UTCJul 11, 18:05 UTC1h 20m
2026-07-11 RPA3568 YQB → EWR Jul 11, 16:59 UTCJul 11, 18:08 UTC1h 9m
2026-07-11 RPA3673 - Jul 11, 14:35 UTCJul 11, 15:50 UTC1h 15m
2026-07-11 RPA3685 - Jul 11, 11:55 UTCJul 11, 13:15 UTC1h 20m
2026-07-11 RPA3667 EWR → CVG Jul 11, 02:00 UTCJul 11, 03:30 UTC1h 30m
2026-07-10 RPA3578 - Jul 10, 23:35 UTCJul 11, 00:45 UTC1h 10m
2026-07-10 RPA3591 EWR → PIT Jul 10, 20:27 UTCJul 10, 22:07 UTC1h 40m
2026-07-10 RPA3591 - Jul 10, 20:35 UTCJul 10, 22:05 UTC1h 30m
2026-07-10 RPA3443 - Jul 10, 17:00 UTCJul 10, 18:20 UTC1h 20m
2026-07-10 RPA3631 - Jul 10, 14:35 UTCJul 10, 15:40 UTC1h 5m
2026-07-10 RPA3673 - Jul 10, 11:35 UTCJul 10, 12:25 UTC50m
2026-07-10 RPA3464 ORD → PIT Jul 10, 04:30 UTCJul 10, 05:40 UTC1h 10m
2026-07-10 RPA3597 - Jul 10, 01:15 UTCJul 10, 02:00 UTC45m
2026-07-09 RPA3597 MSY → ORD Jul 9, 23:00 UTCJul 10, 02:00 UTC3h 0m
2026-07-09 RPA3597 MSY → ORD Jul 9, 22:55 UTCJul 10, 01:00 UTC2h 5m
2026-07-09 RPA3658 - Jul 9, 20:10 UTCJul 9, 22:05 UTC1h 55m
2026-07-09 RPA3663 - Jul 9, 14:55 UTCJul 9, 16:35 UTC1h 40m
2026-07-09 RPA3663 YOW → ORD Jul 9, 15:00 UTCJul 9, 16:25 UTC1h 25m
2026-07-09 RPA3612 - Jul 9, 12:40 UTCJul 9, 13:50 UTC1h 10m
2026-07-09 RPA3551 BOS → EWR Jul 9, 10:00 UTCJul 9, 11:15 UTC1h 15m
2026-07-09 RPA3622 - Jul 9, 02:15 UTCJul 9, 03:15 UTC1h 0m
2026-07-09 RPA3449 - Jul 9, 00:20 UTCJul 9, 01:00 UTC40m
2026-07-09 RPA3449 PIT → IAD Jul 9, 00:15 UTCJul 9, 00:57 UTC42m
2026-07-08 RPA3447 - Jul 8, 21:50 UTCJul 8, 22:40 UTC50m
2026-07-08 RPA3618 - Jul 8, 19:05 UTCJul 8, 20:40 UTC1h 35m
2026-07-08 RPA3618 TVC → EWR Jul 8, 18:53 UTCJul 8, 20:29 UTC1h 36m
2026-07-08 RPA3588 - Jul 8, 14:45 UTCJul 8, 16:10 UTC1h 25m
2026-07-08 RPA3685 - Jul 8, 11:40 UTCJul 8, 13:10 UTC1h 30m
2026-07-08 RPA3667 - Jul 8, 01:40 UTCJul 8, 03:10 UTC1h 30m
2026-07-07 RPA3564 STL → EWR Jul 7, 22:10 UTCJul 8, 00:30 UTC2h 20m
2026-07-07 RPA3556 EWR → STL Jul 7, 18:45 UTCJul 7, 20:45 UTC2h 0m
2026-07-07 RPA3448 - Jul 7, 15:30 UTCJul 7, 16:45 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 N776YX page for operator, model, and routing details .

Mode-S AA818D frequently asked

What is Mode-S code AA818D?
AA818D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N776YX.
Where is Mode-S AA818D registered?
Mode-S code AA818D 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 AA818D broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA818D, octal 52500615, decimal 11,174,285.
What flights does AA818D operate?
Mode-S AA818D has broadcast 20 distinct callsigns, including RPA3579, RPA3448, RPA3635, RPA3614, RPA3564.