Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ABFA81

ICAO 24-bit transponder address · allocated to United States

Hex
ABFA81
Octal
52775201
Decimal
11,270,785
Country
US
No current signal · last broadcast 21d ago
Flights observed
110
Distinct callsigns
2
Country
US
Last broadcast
21d ago

Last known position

Most recent position reported by Mode-S ABFA81.

Country allocation

The ICAO 24-bit address ABFA81 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 2 distinct

Callsign Airline Flights Last seen
ERU871 - 105 2026-07-25
N871ER - 5 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 ERU871 - Jul 25, 15:55 UTCJul 25, 17:50 UTC1h 55m
2026-07-24 ERU871 - Jul 24, 12:00 UTCJul 24, 13:20 UTC1h 20m
2026-07-23 ERU871 - Jul 23, 18:55 UTCJul 23, 20:05 UTC1h 10m
2026-07-23 ERU871 - Jul 23, 16:35 UTCJul 23, 17:50 UTC1h 15m
2026-07-23 ERU871 - Jul 23, 11:45 UTCJul 23, 13:25 UTC1h 40m
2026-07-22 ERU871 - Jul 22, 18:05 UTCJul 22, 18:40 UTC35m
2026-07-22 ERU871 - Jul 22, 14:35 UTCJul 22, 15:05 UTC30m
2026-07-22 ERU871 - Jul 22, 13:10 UTCJul 22, 14:05 UTC55m
2026-07-21 ERU871 - Jul 21, 15:50 UTCJul 21, 17:20 UTC1h 30m
2026-07-17 ERU871 - Jul 17, 15:29 UTCJul 17, 16:19 UTC50m
2026-07-17 ERU871 - Jul 17, 10:30 UTCJul 17, 11:50 UTC1h 20m
2026-07-17 ERU871 - Jul 17, 00:35 UTCJul 17, 01:39 UTC1h 5m
2026-07-16 ERU871 - Jul 16, 13:30 UTCJul 16, 15:05 UTC1h 35m
2026-07-16 ERU871 - Jul 16, 10:25 UTCJul 16, 11:54 UTC1h 30m
2026-07-15 ERU871 - Jul 15, 21:45 UTCJul 15, 23:30 UTC1h 45m
2026-07-15 ERU871 - Jul 15, 18:15 UTCJul 15, 19:25 UTC1h 10m
2026-07-15 ERU871 - Jul 15, 13:40 UTCJul 15, 15:25 UTC1h 45m
2026-07-15 ERU871 - Jul 15, 01:55 UTCJul 15, 03:10 UTC1h 15m
2026-07-14 ERU871 - Jul 14, 15:55 UTCJul 14, 17:00 UTC1h 5m
2026-07-14 ERU871 - Jul 14, 12:15 UTCJul 14, 14:05 UTC1h 50m
2026-07-14 ERU871 - Jul 14, 03:25 UTCJul 14, 03:40 UTC15m
2026-07-13 ERU871 - Jul 13, 17:45 UTCJul 13, 19:15 UTC1h 30m
2026-07-13 ERU871 - Jul 13, 15:20 UTCJul 13, 15:55 UTC35m
2026-07-13 ERU871 - Jul 13, 12:35 UTCJul 13, 14:15 UTC1h 40m
2026-07-12 ERU871 - Jul 12, 15:30 UTCJul 12, 15:45 UTC15m
2026-07-12 ERU871 - Jul 12, 13:01 UTCJul 12, 13:25 UTC25m
2026-07-12 ERU871 - Jul 12, 01:15 UTCJul 12, 02:15 UTC1h 0m
2026-07-11 ERU871 - Jul 11, 17:45 UTCJul 11, 19:30 UTC1h 45m
2026-07-11 ERU871 - Jul 11, 12:30 UTCJul 11, 14:45 UTC2h 15m
2026-07-11 ERU871 - Jul 11, 00:30 UTCJul 11, 01:05 UTC35m
2026-07-10 ERU871 - Jul 10, 22:30 UTCJul 10, 23:35 UTC1h 5m
2026-07-10 ERU871 - Jul 10, 18:50 UTCJul 10, 19:35 UTC45m
2026-07-10 ERU871 - Jul 10, 16:45 UTCJul 10, 18:05 UTC1h 20m
2026-07-10 ERU871 - Jul 10, 12:45 UTCJul 10, 15:45 UTC3h 0m
2026-07-09 ERU871 - Jul 9, 22:30 UTCJul 10, 00:20 UTC1h 50m
2026-07-09 ERU871 - Jul 9, 20:15 UTCJul 9, 20:55 UTC40m
2026-07-09 ERU871 - Jul 9, 17:45 UTCJul 9, 18:40 UTC55m
2026-07-09 ERU871 - Jul 9, 15:10 UTCJul 9, 16:25 UTC1h 15m
2026-07-09 ERU871 - Jul 9, 10:45 UTCJul 9, 12:05 UTC1h 20m
2026-07-08 ERU871 - Jul 8, 16:05 UTCJul 8, 17:20 UTC1h 15m
2026-07-08 ERU871 - Jul 8, 11:35 UTCJul 8, 12:00 UTC25m
2026-07-08 ERU871 - Jul 8, 10:15 UTCJul 8, 10:40 UTC25m
2026-07-07 ERU871 - Jul 7, 11:20 UTCJul 7, 12:25 UTC1h 5m
2026-07-02 ERU871 - Jul 2, 13:00 UTCJul 2, 13:25 UTC25m
2026-07-02 ERU871 - Jul 2, 12:15 UTCJul 2, 12:25 UTC10m
2026-06-23 ERU871 - Jun 23, 15:04 UTCJun 23, 16:20 UTC1h 15m
2026-06-23 ERU871 - Jun 23, 13:15 UTCJun 23, 13:39 UTC25m
2026-06-22 ERU871 - Jun 22, 18:00 UTCJun 22, 19:19 UTC1h 20m
2026-06-22 ERU871 - Jun 22, 12:54 UTCJun 22, 14:10 UTC1h 15m
2026-06-19 ERU871 - Jun 19, 13:04 UTCJun 19, 14:29 UTC1h 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.

Mode-S ABFA81 frequently asked

What is Mode-S code ABFA81?
ABFA81 is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S ABFA81 registered?
Mode-S code ABFA81 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 ABFA81 broadcasting right now?
No active broadcast right now. Last signal was 21d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABFA81, octal 52775201, decimal 11,270,785.
What flights does ABFA81 operate?
Mode-S ABFA81 has broadcast 2 distinct callsigns, including ERU871, N871ER.