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sensors Mode-S transponder

A18558

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1976B · ROBINSON R-44 Raven · operated by EMERALD CITY AIRCRAFT LEASING INC

Hex
A18558
Octal
50302530
Decimal
10,585,432
Country
US
Tail
N1976B
Type
R44
No current signal · last broadcast 17h ago
Flights observed
212
Distinct callsigns
1
Country
US
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S A18558.

Country allocation

The ICAO 24-bit address A18558 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
N1976B - 212 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N1976B - Jul 14, 03:15 UTCJul 14, 03:25 UTC10m
2026-07-14 N1976B - Jul 14, 01:15 UTCJul 14, 01:45 UTC30m
2026-07-14 N1976B - Jul 14, 00:15 UTCJul 14, 00:25 UTC10m
2026-07-13 N1976B - Jul 13, 17:20 UTCJul 13, 17:45 UTC25m
2026-07-13 N1976B - Jul 13, 03:05 UTCJul 13, 03:40 UTC35m
2026-07-13 N1976B - Jul 13, 00:55 UTCJul 13, 02:15 UTC1h 20m
2026-07-12 N1976B - Jul 12, 23:40 UTCJul 13, 00:01 UTC20m
2026-07-12 N1976B - Jul 12, 19:10 UTCJul 12, 19:45 UTC35m
2026-07-11 N1976B - Jul 11, 19:35 UTCJul 11, 19:50 UTC15m
2026-07-11 N1976B - Jul 11, 18:30 UTCJul 11, 18:55 UTC25m
2026-07-11 N1976B - Jul 11, 16:15 UTCJul 11, 17:15 UTC1h 0m
2026-07-11 N1976B - Jul 11, 15:20 UTCJul 11, 15:35 UTC15m
2026-07-11 N1976B - Jul 11, 03:40 UTCJul 11, 03:50 UTC10m
2026-07-10 N1976B - Jul 10, 22:20 UTCJul 10, 22:50 UTC30m
2026-07-10 N1976B - Jul 10, 19:50 UTCJul 10, 20:05 UTC15m
2026-07-10 N1976B - Jul 10, 01:25 UTCJul 10, 01:35 UTC10m
2026-07-09 N1976B - Jul 9, 22:55 UTCJul 10, 00:35 UTC1h 40m
2026-07-09 N1976B BFI → BFI Jul 9, 21:40 UTCJul 9, 22:15 UTC35m
2026-07-09 N1976B - Jul 9, 20:35 UTCJul 9, 21:05 UTC30m
2026-07-09 N1976B - Jul 9, 18:55 UTCJul 9, 19:45 UTC50m
2026-07-09 N1976B - Jul 9, 17:25 UTCJul 9, 17:35 UTC10m
2026-07-09 N1976B - Jul 9, 16:25 UTCJul 9, 16:40 UTC15m
2026-07-09 N1976B - Jul 9, 03:50 UTCJul 9, 04:05 UTC15m
2026-07-09 N1976B - Jul 9, 02:25 UTCJul 9, 02:55 UTC30m
2026-07-08 N1976B - Jul 8, 19:20 UTCJul 8, 19:35 UTC15m
2026-07-08 N1976B - Jul 8, 18:20 UTCJul 8, 18:30 UTC10m
2026-07-08 N1976B - Jul 8, 02:30 UTCJul 8, 02:45 UTC15m
2026-07-07 N1976B - Jul 7, 19:55 UTCJul 7, 20:45 UTC50m
2026-07-06 N1976B - Jul 6, 03:20 UTCJul 6, 03:55 UTC35m
2026-07-04 N1976B - Jul 4, 23:15 UTCJul 4, 23:30 UTC15m
2026-07-04 N1976B - Jul 4, 22:20 UTCJul 4, 22:35 UTC15m
2026-07-04 N1976B BFI → BFI Jul 4, 20:00 UTCJul 4, 20:40 UTC40m
2026-07-04 N1976B - Jul 4, 17:35 UTCJul 4, 17:50 UTC15m
2026-07-04 N1976B - Jul 4, 15:10 UTCJul 4, 15:25 UTC15m
2026-07-04 N1976B - Jul 4, 03:40 UTCJul 4, 04:10 UTC30m
2026-07-04 N1976B BFI → BFI Jul 4, 02:40 UTCJul 4, 02:55 UTC15m
2026-07-04 N1976B - Jul 4, 01:50 UTCJul 4, 02:10 UTC20m
2026-07-03 N1976B BFI → BFI Jul 3, 23:15 UTCJul 3, 23:30 UTC15m
2026-07-03 N1976B - Jul 3, 22:05 UTCJul 3, 22:35 UTC30m
2026-07-03 N1976B - Jul 3, 21:15 UTCJul 3, 21:30 UTC15m
2026-07-03 N1976B - Jul 3, 19:30 UTCJul 3, 20:10 UTC40m
2026-07-03 N1976B - Jul 3, 01:30 UTCJul 3, 02:35 UTC1h 5m
2026-07-02 N1976B - Jul 2, 23:50 UTCJul 3, 00:15 UTC25m
2026-07-02 N1976B BFI → BFI Jul 2, 22:30 UTCJul 2, 22:45 UTC15m
2026-07-02 N1976B - Jul 2, 20:45 UTCJul 2, 21:40 UTC55m
2026-07-02 N1976B BFI → BFI Jul 2, 18:45 UTCJul 2, 19:25 UTC40m
2026-07-02 N1976B BFI → BFI Jul 2, 12:50 UTCJul 2, 12:55 UTC5m
2026-07-02 N1976B BFI → BFI Jul 2, 03:30 UTCJul 2, 03:45 UTC15m
2026-07-02 N1976B - Jul 2, 02:25 UTCJul 2, 02:45 UTC20m
2026-07-01 N1976B BFI → BFI Jul 1, 18:45 UTCJul 1, 19:35 UTC50m

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 N1976B page for operator, model, and routing details .

Mode-S A18558 frequently asked

What is Mode-S code A18558?
A18558 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1976B.
Where is Mode-S A18558 registered?
Mode-S code A18558 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 A18558 broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A18558, octal 50302530, decimal 10,585,432.
What flights does A18558 operate?
Mode-S A18558 has broadcast 1 distinct callsign, including N1976B.