Apparatus

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sensors Mode-S transponder

C87F33

ICAO 24-bit transponder address

Currently assigned to NZ3618 · KAMAN Seasprite

Hex
C87F33
Octal
62077463
Decimal
13,139,763
Tail
NZ3618
Type
H2
No current signal · last broadcast 18h ago
Flights observed
3
Distinct callsigns
1
Country
-
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S C87F33.

Callsign history 1 distinct

Callsign Airline Flights Last seen
SEA3618 - 3 2026-04-14

Recent flights last 3

DateFlightRouteTakeoffLandingDuration
2026-04-14 SEA3618 - Apr 14, 08:35 UTCApr 14, 09:00 UTC25m
2026-04-14 SEA3618 - Apr 14, 05:15 UTCApr 14, 05:35 UTC20m
2026-04-13 SEA3618 - Apr 13, 22:15 UTCApr 13, 23:10 UTC55m

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 NZ3618 page for operator, model, and routing details .

Mode-S C87F33 frequently asked

What is Mode-S code C87F33?
C87F33 is an ICAO 24-bit transponder address. Assigned to NZ3618.
Is C87F33 broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C87F33, octal 62077463, decimal 13,139,763.
What flights does C87F33 operate?
Mode-S C87F33 has broadcast 1 distinct callsign, including SEA3618.