Apparatus

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sensors Mode-S transponder

AA88FB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N778YX · EMBRAER ERJ-170-100 · operated by REPUBLIC AIRWAYS INC

Hex
AA88FB
Octal
52504373
Decimal
11,176,187
Country
US
Tail
N778YX
Type
E170
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
679
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S AA88FB.

Country allocation

The ICAO 24-bit address AA88FB 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
RPA3626 - 11 2026-07-17
RPA3543 - 8 2026-06-19
RPA3571 Republic Airlines 7 2026-06-01
RPA3415 - 7 2026-07-12
RPA3702 - 6 2026-07-03
RPA3661 Republic Airlines 6 2026-07-25
RPA3638 Republic Airlines 6 2026-06-10
RPA3620 - 6 2026-07-01
RPA3610 - 6 2026-07-08
RPA3596 - 6 2026-06-29
RPA3563 - 6 2026-06-16
RPA3562 - 6 2026-07-04
RPA3539 - 6 2026-07-12
RPA3508 - 6 2026-07-17
RPA3718 - 5 2026-06-15
RPA3708 - 5 2026-07-05
RPA3686 - 5 2026-06-30
RPA3665 - 5 2026-07-21
RPA3658 - 5 2026-07-07
RPA3641 - 5 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3523 MSY → EWR Jul 26, 20:15 UTCJul 26, 21:45 UTC1h 30m
2026-07-26 RPA3406 EWR → MSN Jul 26, 16:10 UTCJul 26, 18:40 UTC2h 30m
2026-07-26 RPA3640 BOS → EWR Jul 26, 01:35 UTCJul 26, 04:00 UTC2h 25m
2026-07-25 RPA3566 ORD → CVG Jul 25, 22:10 UTCJul 25, 23:30 UTC1h 20m
2026-07-25 RPA3531 EWR → CLT Jul 25, 19:25 UTCJul 25, 20:30 UTC1h 5m
2026-07-25 RPA3687 JAX → EWR Jul 25, 17:10 UTCJul 25, 18:10 UTC1h 0m
2026-07-25 RPA3404 BOS → EWR Jul 25, 14:35 UTCJul 25, 15:10 UTC35m
2026-07-25 RPA3661 IAD → EWR Jul 25, 11:20 UTCJul 25, 12:00 UTC40m
2026-07-25 RPA3661 IAD → EWR Jul 25, 11:23 UTCJul 25, 11:46 UTC23m
2026-07-25 RPA3707 RDU → EWR Jul 25, 01:05 UTCJul 25, 01:35 UTC30m
2026-07-24 RPA3707 RDU → EWR Jul 24, 19:10 UTCJul 24, 21:15 UTC2h 5m
2026-07-24 RPA3653 ORD → YQB Jul 24, 15:50 UTCJul 24, 17:50 UTC2h 0m
2026-07-24 RPA3661 - Jul 24, 11:10 UTCJul 24, 11:50 UTC40m
2026-07-23 RPA3455 CMH → EWR Jul 23, 23:25 UTCJul 24, 00:00 UTC35m
2026-07-23 RPA3426 EYW → EWR Jul 23, 19:30 UTCJul 23, 21:20 UTC1h 50m
2026-07-23 RPA3426 EYW → EWR Jul 23, 19:25 UTCJul 23, 21:05 UTC1h 40m
2026-07-23 RPA3487 YYZ → EWR Jul 23, 16:50 UTCJul 23, 18:05 UTC1h 15m
2026-07-22 RPA3671 MHT → EWR Jul 22, 17:03 UTCJul 22, 17:59 UTC56m
2026-07-22 RPA3671 MHT → EWR Jul 22, 17:00 UTCJul 22, 18:05 UTC1h 5m
2026-07-21 RPA3531 EWR → CLT Jul 21, 22:50 UTCJul 22, 00:00 UTC1h 10m
2026-07-21 RPA3605 YYZ → ORD Jul 21, 19:50 UTCJul 21, 21:10 UTC1h 20m
2026-07-21 RPA3605 YYZ → ORD Jul 21, 19:34 UTCJul 21, 20:49 UTC1h 15m
2026-07-21 RPA3490 ORF → EWR Jul 21, 17:10 UTCJul 21, 18:15 UTC1h 5m
2026-07-21 RPA3465 DCA → EWR Jul 21, 14:25 UTCJul 21, 15:55 UTC1h 30m
2026-07-21 RPA3665 - Jul 21, 12:25 UTCJul 21, 13:10 UTC45m
2026-07-21 RPA3665 EWR → PWM Jul 21, 12:07 UTCJul 21, 13:13 UTC1h 6m
2026-07-21 RPA3711 YYZ → EWR Jul 21, 01:00 UTCJul 21, 02:00 UTC1h 0m
2026-07-20 RPA3557 - Jul 20, 21:45 UTCJul 20, 22:45 UTC1h 0m
2026-07-20 RPA3447 IAD → JAX Jul 20, 17:55 UTCJul 20, 19:40 UTC1h 45m
2026-07-20 RPA3676 - Jul 20, 15:05 UTCJul 20, 16:50 UTC1h 45m
2026-07-20 RPA3685 YYZ → EWR Jul 20, 12:00 UTCJul 20, 13:30 UTC1h 30m
2026-07-19 RPA3546 - Jul 19, 21:40 UTCJul 19, 22:50 UTC1h 10m
2026-07-19 RPA3414 EWR → BNA Jul 19, 18:35 UTCJul 19, 19:55 UTC1h 20m
2026-07-19 RPA3414 EWR → BNA Jul 19, 18:42 UTCJul 19, 19:47 UTC1h 5m
2026-07-19 RPA3621 EWR → YUL Jul 19, 15:55 UTCJul 19, 16:55 UTC1h 0m
2026-07-19 RPA3409 - Jul 19, 13:35 UTCJul 19, 14:40 UTC1h 5m
2026-07-18 RPA3320 - Jul 18, 18:35 UTCJul 18, 20:20 UTC1h 45m
2026-07-18 RPA3548 IAD → PWM Jul 18, 13:11 UTCJul 18, 14:12 UTC1h 1m
2026-07-18 RPA3438 - Jul 18, 10:10 UTCJul 18, 11:20 UTC1h 10m
2026-07-18 RPA3659 - Jul 18, 04:05 UTCJul 18, 04:50 UTC45m
2026-07-18 RPA3659 ORD → SDF Jul 18, 03:38 UTCJul 18, 04:49 UTC1h 11m
2026-07-18 RPA3444 - Jul 18, 01:05 UTCJul 18, 02:00 UTC55m
2026-07-18 RPA3444 CMH → ORD Jul 18, 01:18 UTCJul 18, 01:46 UTC28m
2026-07-17 RPA3570 - Jul 17, 22:40 UTCJul 17, 23:35 UTC55m
2026-07-17 RPA3442 - Jul 17, 18:50 UTCJul 17, 20:40 UTC1h 50m
2026-07-17 RPA3504 - Jul 17, 16:29 UTCJul 17, 17:50 UTC1h 20m
2026-07-17 RPA3508 - Jul 17, 14:35 UTCJul 17, 15:25 UTC50m
2026-07-17 RPA3626 EWR → ORF Jul 17, 12:19 UTCJul 17, 13:15 UTC55m
2026-07-17 RPA3711 YYZ → EWR Jul 17, 00:23 UTCJul 17, 01:04 UTC41m
2026-07-17 RPA3711 - Jul 17, 00:14 UTCJul 17, 01:20 UTC1h 5m

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 N778YX page for operator, model, and routing details .

Mode-S AA88FB frequently asked

What is Mode-S code AA88FB?
AA88FB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N778YX.
Where is Mode-S AA88FB registered?
Mode-S code AA88FB 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 AA88FB 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 AA88FB, octal 52504373, decimal 11,176,187.
What flights does AA88FB operate?
Mode-S AA88FB has broadcast 20 distinct callsigns, including RPA3626, RPA3543, RPA3571, RPA3415, RPA3702.