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
Broadcasting now · callsign RPA4583 · 27,075 ft
Flights observed
740
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Current position

ABBB77 is currently broadcasting. Map zoomed to live position.

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
RPA4509 Republic Airlines 23 2026-07-24
RPA4420 - 20 2026-07-17
RPA4388 - 20 2026-07-20
RPA4347 Republic Airlines 20 2026-07-26
RPA4797 - 18 2026-07-10
RPA4570 Republic Airlines 18 2026-07-23
RPA4446 Republic Airlines 18 2026-05-18
RPA4381 Republic Airlines 17 2026-07-22
RPA4713 - 16 2026-07-21
RPA4404 - 15 2026-07-14
RPA4550 Republic Airlines 13 2026-07-19
RPA4483 Republic Airlines 13 2026-07-22
RPA4621 Republic Airlines 12 2026-05-18
RPA4605 - 12 2026-07-17
RPA4438 - 12 2026-07-16
RPA4670 Republic Airlines 11 2026-07-25
RPA4624 - 11 2026-07-07
RPA4614 - 11 2026-07-10
RPA4471 Republic Airlines 11 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4479 JFK → RDU Jul 26, 20:00 UTCJul 26, 20:55 UTC55m
2026-07-26 RPA4479 JFK → RDU Jul 26, 17:40 UTCJul 26, 18:35 UTC55m
2026-07-26 RPA4347 ORD → CLE Jul 26, 15:20 UTCJul 26, 16:30 UTC1h 10m
2026-07-26 RPA4347 ORD → CLE Jul 26, 12:50 UTCJul 26, 13:50 UTC1h 0m
2026-07-26 RPA4578 ALB → MIA Jul 26, 10:15 UTCJul 26, 11:25 UTC1h 10m
2026-07-25 RPA4421 MSY → PHL Jul 25, 20:35 UTCJul 25, 21:45 UTC1h 10m
2026-07-25 RPA4601 MEM → LGA Jul 25, 17:20 UTCJul 25, 18:50 UTC1h 30m
2026-07-25 RPA4601 MEM → LGA Jul 25, 14:30 UTCJul 25, 16:00 UTC1h 30m
2026-07-25 RPA4670 LGA → ATL Jul 25, 11:20 UTCJul 25, 12:45 UTC1h 25m
2026-07-24 RPA4667 IND → PHL Jul 24, 23:45 UTCJul 25, 01:15 UTC1h 30m
2026-07-24 RPA4509 LGA → RDU Jul 24, 20:25 UTCJul 24, 22:20 UTC1h 55m
2026-07-24 RPA4509 LGA → RDU Jul 24, 20:20 UTCJul 24, 22:20 UTC2h 0m
2026-07-24 RPA4509 LGA → RDU Jul 24, 17:10 UTCJul 24, 19:20 UTC2h 10m
2026-07-24 RPA4373 BNH → LGA Jul 24, 15:05 UTCJul 24, 15:50 UTC45m
2026-07-24 RPA4373 LGA → BOS Jul 24, 13:25 UTCJul 24, 14:00 UTC35m
2026-07-24 RPA4670 LGA → ATL Jul 24, 10:10 UTCJul 24, 11:40 UTC1h 30m
2026-07-24 RPA4667 IND → PHL Jul 24, 01:35 UTCJul 24, 03:10 UTC1h 35m
2026-07-23 RPA4471 MEM → LGA Jul 23, 22:30 UTCJul 23, 23:35 UTC1h 5m
2026-07-23 RPA4471 MEM → LGA Jul 23, 20:15 UTCJul 23, 21:10 UTC55m
2026-07-23 RPA4570 JFK → BWI Jul 23, 18:10 UTCJul 23, 19:10 UTC1h 0m
2026-07-23 RPA4570 JFK → BWI Jul 23, 18:07 UTCJul 23, 19:06 UTC59m
2026-07-23 RPA4570 JFK → BWI Jul 23, 16:25 UTCJul 23, 17:00 UTC35m
2026-07-23 RPA4591 DCA → LGA Jul 23, 13:15 UTCJul 23, 14:55 UTC1h 40m
2026-07-22 RPA4593 LGA → ORF Jul 22, 22:10 UTCJul 23, 00:20 UTC2h 10m
2026-07-22 RPA4381 BUF → ORD Jul 22, 19:30 UTCJul 22, 20:20 UTC50m
2026-07-22 RPA4381 BUF → ORD Jul 22, 19:26 UTCJul 22, 20:18 UTC52m
2026-07-22 RPA4381 BUF → ORD Jul 22, 17:55 UTCJul 22, 18:40 UTC45m
2026-07-22 RPA4483 RDU → LGA Jul 22, 15:35 UTCJul 22, 16:40 UTC1h 5m
2026-07-22 RPA4483 RDU → LGA Jul 22, 13:05 UTCJul 22, 14:35 UTC1h 30m
2026-07-22 RPA4610 PHL → TVC Jul 22, 11:10 UTCJul 22, 11:35 UTC25m
2026-07-22 RPA4539 MEM → LGA Jul 22, 03:45 UTCJul 22, 04:40 UTC55m
2026-07-22 RPA4457 - Jul 22, 00:00 UTCJul 22, 01:55 UTC1h 55m
2026-07-21 RPA9942 - Jul 21, 14:15 UTCJul 21, 16:00 UTC1h 45m
2026-07-21 RPA4486 MEM → PHL Jul 21, 12:14 UTCJul 21, 13:13 UTC59m
2026-07-21 RPA4486 MEM → PHL Jul 21, 12:15 UTCJul 21, 13:30 UTC1h 15m
2026-07-21 RPA4713 - Jul 21, 00:25 UTCJul 21, 01:30 UTC1h 5m
2026-07-21 RPA4713 CLE → LGA Jul 21, 00:21 UTCJul 21, 01:29 UTC1h 8m
2026-07-20 RPA4713 LGA → CLE Jul 20, 21:45 UTCJul 20, 22:50 UTC1h 5m
2026-07-20 RPA4388 - Jul 20, 18:05 UTCJul 20, 19:15 UTC1h 10m
2026-07-20 RPA4388 CLE → LGA Jul 20, 18:03 UTCJul 20, 19:13 UTC1h 10m
2026-07-20 RPA4388 LGA → CLE Jul 20, 16:05 UTCJul 20, 17:10 UTC1h 5m
2026-07-20 RPA4357 - Jul 20, 13:20 UTCJul 20, 15:15 UTC1h 55m
2026-07-20 RPA4357 IND → LGA Jul 20, 13:19 UTCJul 20, 15:15 UTC1h 56m
2026-07-20 RPA4458 LGA → IND Jul 20, 00:35 UTCJul 20, 02:10 UTC1h 35m
2026-07-19 RPA4509 LGA → RDU Jul 19, 20:40 UTCJul 19, 22:41 UTC2h 1m
2026-07-19 RPA4509 LGA → RDU Jul 19, 20:40 UTCJul 19, 22:45 UTC2h 5m
2026-07-19 RPA4509 LGA → RDU Jul 19, 17:20 UTCJul 19, 19:30 UTC2h 10m
2026-07-19 RPA4550 YUL → LGA Jul 19, 14:50 UTCJul 19, 15:55 UTC1h 5m
2026-07-19 RPA4550 YUL → LGA Jul 19, 14:47 UTCJul 19, 15:47 UTC1h 0m
2026-07-19 RPA4550 YUL → LGA Jul 19, 12:25 UTCJul 19, 13:25 UTC1h 0m

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?
Yes. Mode-S ABBB77 is currently airborne.
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, RPA4509, RPA4420, RPA4388, RPA4347.