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sensors Mode-S transponder

ABF4DF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N87KA · DE HAVILLAND DHC-3 Otter · operated by KENMORE AIR HARBOR LLC

Hex
ABF4DF
Octal
52772337
Decimal
11,269,343
Country
US
Tail
N87KA
Type
DHC3
No current signal · last broadcast 26d ago
Flights observed
123
Distinct callsigns
1
Country
US
Last broadcast
26d ago

Last known position

Most recent position reported by Mode-S ABF4DF.

Country allocation

The ICAO 24-bit address ABF4DF 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 1 distinct

Callsign Airline Flights Last seen
N87KA - 123 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N87KA - Jul 26, 21:05 UTCJul 26, 21:10 UTC5m
2026-07-26 N87KA - Jul 26, 20:00 UTCJul 26, 20:45 UTC45m
2026-07-26 N87KA - Jul 26, 18:50 UTCJul 26, 19:30 UTC40m
2026-07-26 N87KA - Jul 26, 17:40 UTCJul 26, 18:20 UTC40m
2026-07-26 N87KA - Jul 26, 16:15 UTCJul 26, 16:55 UTC40m
2026-07-26 N87KA KEH → LKE Jul 26, 15:40 UTCJul 26, 15:50 UTC10m
2026-07-25 N87KA - Jul 25, 18:10 UTCJul 25, 20:15 UTC2h 5m
2026-07-25 N87KA - Jul 25, 15:35 UTCJul 25, 16:45 UTC1h 10m
2026-07-24 N87KA - Jul 24, 01:25 UTCJul 24, 02:00 UTC35m
2026-07-24 N87KA - Jul 24, 00:00 UTCJul 24, 00:45 UTC45m
2026-07-23 N87KA - Jul 23, 23:00 UTCJul 23, 23:35 UTC35m
2026-07-23 N87KA - Jul 23, 21:45 UTCJul 23, 22:30 UTC45m
2026-07-23 N87KA - Jul 23, 17:00 UTCJul 23, 17:40 UTC40m
2026-07-23 N87KA - Jul 23, 15:45 UTCJul 23, 16:25 UTC40m
2026-07-23 N87KA - Jul 23, 15:10 UTCJul 23, 15:15 UTC5m
2026-07-23 N87KA TIW → KEH Jul 23, 00:45 UTCJul 23, 01:40 UTC55m
2026-07-22 N87KA - Jul 22, 23:50 UTCJul 23, 00:05 UTC15m
2026-07-22 N87KA - Jul 22, 21:25 UTCJul 22, 23:05 UTC1h 40m
2026-07-21 N87KA - Jul 21, 23:30 UTCJul 22, 00:30 UTC1h 0m
2026-07-21 N87KA - Jul 21, 21:55 UTCJul 21, 22:40 UTC45m
2026-07-21 N87KA - Jul 21, 20:20 UTCJul 21, 21:15 UTC55m
2026-07-21 N87KA - Jul 21, 18:20 UTCJul 21, 19:30 UTC1h 10m
2026-07-21 N87KA - Jul 21, 01:35 UTCJul 21, 02:20 UTC45m
2026-07-21 N87KA - Jul 21, 00:20 UTCJul 21, 01:00 UTC40m
2026-07-20 N87KA - Jul 20, 23:00 UTCJul 20, 23:45 UTC45m
2026-07-20 N87KA - Jul 20, 21:40 UTCJul 20, 22:15 UTC35m
2026-07-20 N87KA - Jul 20, 20:35 UTCJul 20, 21:10 UTC35m
2026-07-20 N87KA - Jul 20, 19:30 UTCJul 20, 20:10 UTC40m
2026-07-20 N87KA - Jul 20, 18:10 UTCJul 20, 18:50 UTC40m
2026-07-20 N87KA - Jul 20, 17:05 UTCJul 20, 17:45 UTC40m
2026-07-20 N87KA - Jul 20, 15:35 UTCJul 20, 16:20 UTC45m
2026-07-20 N87KA - Jul 20, 15:00 UTCJul 20, 15:10 UTC10m
2026-07-20 N87KA - Jul 20, 00:50 UTCJul 20, 01:25 UTC35m
2026-07-19 N87KA KEH → YWH Jul 19, 23:35 UTCJul 20, 00:20 UTC45m
2026-07-19 N87KA - Jul 19, 22:25 UTCJul 19, 23:00 UTC35m
2026-07-19 N87KA - Jul 19, 21:15 UTCJul 19, 21:55 UTC40m
2026-07-19 N87KA - Jul 19, 20:05 UTCJul 19, 20:40 UTC35m
2026-07-19 N87KA - Jul 19, 18:55 UTCJul 19, 19:35 UTC40m
2026-07-19 N87KA - Jul 19, 17:55 UTCJul 19, 18:30 UTC35m
2026-07-19 N87KA - Jul 19, 16:25 UTCJul 19, 17:10 UTC45m
2026-07-19 N87KA - Jul 19, 15:55 UTCJul 19, 16:00 UTC5m
2026-07-19 N87KA YWH → KEH Jul 19, 01:10 UTCJul 19, 01:45 UTC35m
2026-07-18 N87KA - Jul 18, 21:15 UTCJul 18, 21:55 UTC40m
2026-07-18 N87KA - Jul 18, 19:40 UTCJul 18, 20:15 UTC35m
2026-07-18 N87KA - Jul 18, 18:30 UTCJul 18, 19:05 UTC35m
2026-07-18 N87KA - Jul 18, 17:20 UTCJul 18, 18:00 UTC40m
2026-07-18 N87KA - Jul 18, 16:05 UTCJul 18, 16:45 UTC40m
2026-07-18 N87KA - Jul 18, 15:35 UTCJul 18, 15:45 UTC10m
2026-07-18 N87KA - Jul 18, 01:30 UTCJul 18, 02:09 UTC40m
2026-07-18 N87KA - Jul 18, 00:19 UTCJul 18, 01:05 UTC45m

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 N87KA page for operator, model, and routing details .

Mode-S ABF4DF frequently asked

What is Mode-S code ABF4DF?
ABF4DF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N87KA.
Where is Mode-S ABF4DF registered?
Mode-S code ABF4DF 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 ABF4DF broadcasting right now?
No active broadcast right now. Last signal was 26d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABF4DF, octal 52772337, decimal 11,269,343.
What flights does ABF4DF operate?
Mode-S ABF4DF has broadcast 1 distinct callsign, including N87KA.