Apparatus

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sensors Mode-S transponder

ABBB77

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N855RW · EMBRAER ERJ-170-100 · operated by REPUBLIC AIRWAYS INC

Hex
ABBB77
Octal
52735567
Decimal
11,254,647
Country
US
Tail
N855RW
Type
E170
Transponder active on ground
Flights observed
655
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S ABBB77.

Country allocation

The ICAO 24-bit address ABBB77 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
RPA4623 - 30 2026-06-29
RPA4797 - 18 2026-07-10
RPA4446 Republic Airlines 18 2026-05-18
RPA4347 - 18 2026-07-09
RPA4509 Republic Airlines 17 2026-06-10
RPA4420 - 17 2026-07-08
RPA4570 - 15 2026-07-05
RPA4404 - 15 2026-07-14
RPA4388 - 15 2026-07-01
RPA4381 - 14 2026-06-27
RPA4621 Republic Airlines 12 2026-05-18
RPA4624 - 11 2026-07-07
RPA4614 - 11 2026-07-10
RPA4483 Republic Airlines 11 2026-06-26
RPA4713 - 10 2026-07-02
RPA4682 Republic Airlines 10 2026-05-21
RPA4605 - 10 2026-07-08
RPA4473 - 10 2026-07-13
RPA4448 Republic Airlines 10 2026-05-10
RPA4438 - 10 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RPA4550 LGA → YUL Jul 14, 12:25 UTCJul 14, 13:25 UTC1h 0m
2026-07-14 RPA4424 BOS → LGA Jul 14, 10:15 UTCJul 14, 11:00 UTC45m
2026-07-14 RPA4404 LGA → BNH Jul 14, 00:45 UTCJul 14, 01:30 UTC45m
2026-07-14 RPA4404 LGA → BOS Jul 14, 00:44 UTCJul 14, 01:29 UTC45m
2026-07-13 RPA4473 ORF → LGA Jul 13, 18:05 UTCJul 13, 19:05 UTC1h 0m
2026-07-13 RPA4473 LGA → ORF Jul 13, 16:25 UTCJul 13, 17:20 UTC55m
2026-07-13 RPA4586 - Jul 13, 10:55 UTCJul 13, 12:25 UTC1h 30m
2026-07-13 RPA4583 - Jul 13, 01:35 UTCJul 13, 03:15 UTC1h 40m
2026-07-12 RPA4423 - Jul 12, 22:55 UTCJul 13, 00:25 UTC1h 30m
2026-07-12 RPA4423 - Jul 12, 20:10 UTCJul 12, 21:45 UTC1h 35m
2026-07-12 RPA4343 BGR → LGA Jul 12, 17:35 UTCJul 12, 18:35 UTC1h 0m
2026-07-12 RPA4343 LGA → BGR Jul 12, 13:55 UTCJul 12, 15:01 UTC1h 5m
2026-07-12 RPA4670 - Jul 12, 11:45 UTCJul 12, 13:05 UTC1h 20m
2026-07-11 RPA4667 - Jul 11, 22:40 UTCJul 12, 00:10 UTC1h 30m
2026-07-11 RPA4580 - Jul 11, 19:15 UTCJul 11, 21:00 UTC1h 45m
2026-07-11 RPA4580 TVC → LGA Jul 11, 19:11 UTCJul 11, 21:00 UTC1h 49m
2026-07-11 RPA4580 - Jul 11, 16:15 UTCJul 11, 17:50 UTC1h 35m
2026-07-11 RPA4595 BOS → MEM Jul 11, 13:25 UTCJul 11, 15:15 UTC1h 50m
2026-07-11 RPA4595 BOS → MEM Jul 11, 13:24 UTCJul 11, 15:10 UTC1h 46m
2026-07-11 RPA4599 LGA → ATL Jul 11, 10:45 UTCJul 11, 12:30 UTC1h 45m
2026-07-11 RPA4588 - Jul 11, 03:25 UTCJul 11, 03:45 UTC20m
2026-07-11 RPA4588 CHS → LGA Jul 11, 03:22 UTCJul 11, 04:53 UTC1h 31m
2026-07-10 RPA4588 - Jul 10, 22:15 UTCJul 11, 00:15 UTC2h 0m
2026-07-10 RPA4614 - Jul 10, 16:25 UTCJul 10, 17:50 UTC1h 25m
2026-07-10 RPA4614 - Jul 10, 14:05 UTCJul 10, 15:40 UTC1h 35m
2026-07-10 RPA4797 - Jul 10, 11:25 UTCJul 10, 13:00 UTC1h 35m
2026-07-09 RPA9935 - Jul 9, 21:25 UTCJul 9, 22:35 UTC1h 10m
2026-07-09 RPA4497 LGA → RDU Jul 9, 18:35 UTCJul 9, 20:05 UTC1h 30m
2026-07-09 RPA4347 YYZ → LGA Jul 9, 15:51 UTCJul 9, 16:56 UTC1h 5m
2026-07-09 RPA4347 YYZ → LGA Jul 9, 15:55 UTCJul 9, 16:50 UTC55m
2026-07-09 RPA4347 LGA → YYZ Jul 9, 12:55 UTCJul 9, 14:00 UTC1h 5m
2026-07-09 RPA4610 PIT → LGA Jul 9, 10:15 UTCJul 9, 11:20 UTC1h 5m
2026-07-08 RPA4410 LGA → PIT Jul 8, 22:45 UTCJul 8, 23:40 UTC55m
2026-07-08 RPA4410 - Jul 8, 22:45 UTCJul 8, 23:40 UTC55m
2026-07-08 RPA4605 ATL → LGA Jul 8, 19:15 UTCJul 8, 21:00 UTC1h 45m
2026-07-08 RPA4605 ATL → LGA Jul 8, 19:12 UTCJul 8, 20:59 UTC1h 47m
2026-07-08 RPA4605 LGA → ATL Jul 8, 16:05 UTCJul 8, 17:55 UTC1h 50m
2026-07-08 RPA4420 - Jul 8, 13:55 UTCJul 8, 14:50 UTC55m
2026-07-08 RPA4420 PIT → LGA Jul 8, 13:50 UTCJul 8, 14:46 UTC56m
2026-07-08 RPA4420 - Jul 8, 11:10 UTCJul 8, 12:05 UTC55m
2026-07-07 RPA4438 YYZ → LGA Jul 7, 23:55 UTCJul 8, 01:00 UTC1h 5m
2026-07-07 RPA4438 LGA → YYZ Jul 7, 21:20 UTCJul 7, 22:20 UTC1h 0m
2026-07-07 RPA4418 - Jul 7, 18:30 UTCJul 7, 19:50 UTC1h 20m
2026-07-07 RPA4418 GRR → LGA Jul 7, 18:28 UTCJul 7, 19:49 UTC1h 21m
2026-07-07 RPA4418 LGA → GRR Jul 7, 15:50 UTCJul 7, 17:25 UTC1h 35m
2026-07-07 RPA4420 - Jul 7, 13:55 UTCJul 7, 14:50 UTC55m
2026-07-07 RPA4420 - Jul 7, 11:15 UTCJul 7, 12:15 UTC1h 0m
2026-07-07 RPA4624 ATL → LGA Jul 7, 01:15 UTCJul 7, 03:00 UTC1h 45m
2026-07-06 RPA4624 LGA → ATL Jul 6, 22:00 UTCJul 6, 23:55 UTC1h 55m
2026-07-06 RPA4471 - Jul 6, 16:00 UTCJul 6, 18:25 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 N855RW page for operator, model, and routing details .

Mode-S ABBB77 frequently asked

What is Mode-S code ABBB77?
ABBB77 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N855RW.
Where is Mode-S ABBB77 registered?
Mode-S code ABBB77 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 ABBB77 broadcasting right now?
Mode-S ABBB77 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABBB77, octal 52735567, decimal 11,254,647.
What flights does ABBB77 operate?
Mode-S ABBB77 has broadcast 20 distinct callsigns, including RPA4623, RPA4797, RPA4446, RPA4347, RPA4509.