Apparatus

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sensors Mode-S transponder

A18EEF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2SP · BELL 429 GlobalRanger

Hex
A18EEF
Octal
50307357
Decimal
10,587,887
Country
US
Tail
N2SP
Type
B429
No current signal · last broadcast 1d ago
Flights observed
213
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A18EEF.

Country allocation

The ICAO 24-bit address A18EEF 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
N2SP - 213 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 N2SP - Jul 16, 23:20 UTCJul 17, 00:30 UTC1h 10m
2026-07-16 N2SP - Jul 16, 14:10 UTCJul 16, 14:45 UTC35m
2026-07-16 N2SP - Jul 16, 11:34 UTCJul 16, 12:20 UTC45m
2026-07-16 N2SP - Jul 16, 01:55 UTCJul 16, 02:05 UTC10m
2026-07-16 N2SP - Jul 16, 01:30 UTCJul 16, 01:40 UTC10m
2026-07-15 N2SP - Jul 15, 17:35 UTCJul 15, 18:00 UTC25m
2026-07-15 N2SP - Jul 15, 14:40 UTCJul 15, 14:55 UTC15m
2026-07-14 N2SP - Jul 14, 15:40 UTCJul 14, 16:00 UTC20m
2026-07-14 N2SP - Jul 14, 15:10 UTCJul 14, 15:35 UTC25m
2026-07-14 N2SP - Jul 14, 13:00 UTCJul 14, 14:35 UTC1h 35m
2026-07-13 N2SP - Jul 13, 17:45 UTCJul 13, 17:55 UTC10m
2026-07-13 N2SP - Jul 13, 15:55 UTCJul 13, 16:30 UTC35m
2026-07-13 N2SP - Jul 13, 10:20 UTCJul 13, 10:45 UTC25m
2026-07-12 N2SP - Jul 12, 18:40 UTCJul 12, 20:25 UTC1h 45m
2026-07-11 N2SP - Jul 11, 06:05 UTCJul 11, 06:20 UTC15m
2026-07-10 N2SP - Jul 10, 22:20 UTCJul 10, 22:40 UTC20m
2026-07-10 N2SP - Jul 10, 16:35 UTCJul 10, 17:10 UTC35m
2026-07-10 N2SP - Jul 10, 15:40 UTCJul 10, 16:00 UTC20m
2026-07-10 N2SP - Jul 10, 14:00 UTCJul 10, 14:10 UTC10m
2026-07-10 N2SP - Jul 10, 13:10 UTCJul 10, 13:25 UTC15m
2026-07-09 N2SP - Jul 9, 02:10 UTCJul 9, 02:50 UTC40m
2026-07-09 N2SP - Jul 9, 00:25 UTCJul 9, 00:50 UTC25m
2026-07-08 N2SP - Jul 8, 16:10 UTCJul 8, 17:05 UTC55m
2026-07-08 N2SP - Jul 8, 04:35 UTCJul 8, 05:10 UTC35m
2026-07-06 N2SP - Jul 6, 19:45 UTCJul 6, 20:15 UTC30m
2026-07-06 N2SP - Jul 6, 18:40 UTCJul 6, 19:00 UTC20m
2026-07-05 N2SP - Jul 5, 22:05 UTCJul 5, 22:30 UTC25m
2026-07-04 N2SP - Jul 4, 21:10 UTCJul 4, 22:00 UTC50m
2026-07-04 N2SP - Jul 4, 19:50 UTCJul 4, 20:00 UTC10m
2026-07-04 N2SP - Jul 4, 18:15 UTCJul 4, 18:25 UTC10m
2026-07-03 N2SP - Jul 3, 19:40 UTCJul 3, 19:55 UTC15m
2026-07-03 N2SP - Jul 3, 18:15 UTCJul 3, 18:35 UTC20m
2026-07-02 N2SP - Jul 2, 22:00 UTCJul 2, 22:20 UTC20m
2026-07-02 N2SP - Jul 2, 21:20 UTCJul 2, 21:30 UTC10m
2026-07-02 N2SP - Jul 2, 19:20 UTCJul 2, 19:45 UTC25m
2026-07-02 N2SP - Jul 2, 14:40 UTCJul 2, 14:50 UTC10m
2026-07-02 N2SP - Jul 2, 12:05 UTCJul 2, 13:10 UTC1h 5m
2026-07-01 N2SP - Jul 1, 13:20 UTCJul 1, 13:30 UTC10m
2026-07-01 N2SP - Jul 1, 01:45 UTCJul 1, 02:35 UTC50m
2026-06-30 N2SP - Jun 30, 00:39 UTCJun 30, 01:35 UTC56m
2026-06-29 N2SP - Jun 29, 14:39 UTCJun 29, 14:54 UTC15m
2026-06-29 N2SP - Jun 29, 14:09 UTCJun 29, 14:29 UTC20m
2026-06-26 N2SP - Jun 26, 07:05 UTCJun 26, 07:39 UTC35m
2026-06-26 N2SP - Jun 26, 06:45 UTCJun 26, 06:50 UTC5m
2026-06-25 N2SP - Jun 25, 19:20 UTCJun 25, 20:14 UTC55m
2026-06-25 N2SP - Jun 25, 14:29 UTCJun 25, 15:04 UTC35m
2026-06-24 N2SP - Jun 24, 21:44 UTCJun 24, 22:04 UTC20m
2026-06-24 N2SP - Jun 24, 17:45 UTCJun 24, 18:25 UTC40m
2026-06-24 N2SP - Jun 24, 14:29 UTCJun 24, 14:45 UTC15m
2026-06-24 N2SP - Jun 24, 13:34 UTCJun 24, 13:44 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 N2SP page for operator, model, and routing details .

Mode-S A18EEF frequently asked

What is Mode-S code A18EEF?
A18EEF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2SP.
Where is Mode-S A18EEF registered?
Mode-S code A18EEF 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 A18EEF broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A18EEF, octal 50307357, decimal 10,587,887.
What flights does A18EEF operate?
Mode-S A18EEF has broadcast 1 distinct callsign, including N2SP.