Apparatus

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sensors Mode-S transponder

A8B551

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N660ME · ROBINSON R-66 · operated by VALIAIR LC TRUSTEE

Hex
A8B551
Octal
52132521
Decimal
11,056,465
Country
US
Tail
N660ME
Type
R66
No current signal · last broadcast Jul 26, 20:30 UTC
Flights observed
71
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 20:30 UTC

Last known position

Most recent position reported by Mode-S A8B551.

Country allocation

The ICAO 24-bit address A8B551 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
N660ME - 71 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N660ME - Jul 26, 20:20 UTCJul 26, 20:30 UTC10m
2026-07-25 N660ME - Jul 25, 18:55 UTCJul 25, 19:00 UTC5m
2026-07-25 N660ME - Jul 25, 17:20 UTCJul 25, 17:40 UTC20m
2026-07-25 N660ME - Jul 25, 14:25 UTCJul 25, 14:50 UTC25m
2026-07-24 N660ME - Jul 24, 19:45 UTCJul 24, 19:55 UTC10m
2026-07-24 N660ME - Jul 24, 18:20 UTCJul 24, 18:35 UTC15m
2026-07-24 N660ME - Jul 24, 16:10 UTCJul 24, 16:35 UTC25m
2026-07-24 N660ME - Jul 24, 15:20 UTCJul 24, 15:35 UTC15m
2026-07-24 N660ME - Jul 24, 14:00 UTCJul 24, 14:15 UTC15m
2026-07-18 N660ME - Jul 18, 20:20 UTCJul 18, 20:35 UTC15m
2026-07-18 N660ME - Jul 18, 14:20 UTCJul 18, 14:30 UTC10m
2026-07-17 N660ME - Jul 17, 16:15 UTCJul 17, 16:24 UTC10m
2026-07-17 N660ME - Jul 17, 14:50 UTCJul 17, 15:05 UTC15m
2026-07-13 N660ME - Jul 13, 19:15 UTCJul 13, 19:25 UTC10m
2026-07-13 N660ME - Jul 13, 17:45 UTCJul 13, 18:25 UTC40m
2026-07-13 N660ME - Jul 13, 13:00 UTCJul 13, 13:10 UTC10m
2026-07-11 N660ME - Jul 11, 13:25 UTCJul 11, 13:35 UTC10m
2026-07-08 N660ME GUA → GUA Jul 8, 22:00 UTCJul 8, 22:20 UTC20m
2026-07-07 N660ME - Jul 7, 22:45 UTCJul 7, 23:00 UTC15m
2026-07-07 N660ME - Jul 7, 17:15 UTCJul 7, 17:30 UTC15m
2026-07-07 N660ME - Jul 7, 15:15 UTCJul 7, 15:55 UTC40m
2026-07-06 N660ME - Jul 6, 14:45 UTCJul 6, 15:00 UTC15m
2026-07-06 N660ME - Jul 6, 13:20 UTCJul 6, 13:30 UTC10m
2026-07-04 N660ME - Jul 4, 18:35 UTCJul 4, 18:45 UTC10m
2026-07-04 N660ME - Jul 4, 17:35 UTCJul 4, 17:55 UTC20m
2026-07-04 N660ME - Jul 4, 12:30 UTCJul 4, 13:25 UTC55m
2026-07-03 N660ME - Jul 3, 18:35 UTCJul 3, 19:15 UTC40m
2026-06-29 N660ME - Jun 29, 17:59 UTCJun 29, 18:34 UTC35m
2026-06-28 N660ME - Jun 28, 21:59 UTCJun 28, 22:15 UTC15m
2026-06-28 N660ME - Jun 28, 19:44 UTCJun 28, 19:59 UTC15m
2026-06-28 N660ME - Jun 28, 15:14 UTCJun 28, 15:24 UTC10m
2026-06-26 N660ME - Jun 26, 21:24 UTCJun 26, 21:35 UTC10m
2026-06-21 N660ME - Jun 21, 17:35 UTCJun 21, 18:14 UTC40m
2026-06-21 N660ME - Jun 21, 15:09 UTCJun 21, 15:49 UTC40m
2026-06-20 N660ME - Jun 20, 16:39 UTCJun 20, 16:49 UTC10m
2026-06-20 N660ME - Jun 20, 14:29 UTCJun 20, 14:50 UTC20m
2026-06-19 N660ME GUA → GUA Jun 19, 14:54 UTCJun 19, 15:54 UTC1h 0m
2026-06-18 N660ME - Jun 18, 15:10 UTCJun 18, 15:35 UTC25m
2026-06-15 N660ME - Jun 15, 16:04 UTCJun 15, 16:15 UTC10m
2026-06-15 N660ME - Jun 15, 13:30 UTCJun 15, 13:45 UTC15m
2026-06-03 N660ME - Jun 3, 19:50 UTCJun 3, 20:10 UTC20m
2026-06-03 N660ME - Jun 3, 18:15 UTCJun 3, 18:30 UTC15m
2026-05-31 N660ME GUA → GUA May 31, 16:55 UTCMay 31, 17:30 UTC35m
2026-05-28 N660ME - May 28, 19:40 UTCMay 28, 19:55 UTC15m
2026-05-28 N660ME - May 28, 11:40 UTCMay 28, 12:10 UTC30m
2026-05-27 N660ME - May 27, 14:35 UTCMay 27, 14:45 UTC10m
2026-05-27 N660ME - May 27, 12:25 UTCMay 27, 12:55 UTC30m
2026-05-22 N660ME - May 22, 15:00 UTCMay 22, 15:15 UTC15m
2026-05-19 N660ME - May 19, 18:50 UTCMay 19, 19:05 UTC15m
2026-05-16 N660ME - May 16, 14:55 UTCMay 16, 15:05 UTC10m

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 N660ME page for operator, model, and routing details .

Mode-S A8B551 frequently asked

What is Mode-S code A8B551?
A8B551 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N660ME.
Where is Mode-S A8B551 registered?
Mode-S code A8B551 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 A8B551 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8B551, octal 52132521, decimal 11,056,465.
What flights does A8B551 operate?
Mode-S A8B551 has broadcast 1 distinct callsign, including N660ME.