Apparatus

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sensors Mode-S transponder

A18E0A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2HK · operated by INTEGRITY AIRCRAFT TITLE HOLDINGS LLC

Hex
A18E0A
Octal
50307012
Decimal
10,587,658
Country
US
Tail
N2HK
No current signal · last broadcast 2h ago
Flights observed
8
Distinct callsigns
1
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A18E0A.

Country allocation

The ICAO 24-bit address A18E0A 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
2HK - 8 2026-07-14

Recent flights last 8

DateFlightRouteTakeoffLandingDuration
2026-07-14 2HK - Jul 14, 14:40 UTCJul 14, 15:00 UTC20m
2026-07-14 2HK - Jul 14, 01:35 UTCJul 14, 01:50 UTC15m
2026-07-13 2HK - Jul 13, 22:40 UTCJul 13, 23:00 UTC20m
2026-07-13 2HK - Jul 13, 19:20 UTCJul 13, 19:50 UTC30m
2026-07-11 2HK - Jul 11, 22:45 UTCJul 11, 23:30 UTC45m
2026-07-11 2HK - Jul 11, 00:35 UTCJul 11, 00:55 UTC20m
2026-07-10 2HK - Jul 10, 22:45 UTCJul 10, 23:40 UTC55m
2026-07-10 2HK - Jul 10, 19:35 UTCJul 10, 20:35 UTC1h 0m

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 N2HK page for operator, model, and routing details .

Mode-S A18E0A frequently asked

What is Mode-S code A18E0A?
A18E0A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2HK.
Where is Mode-S A18E0A registered?
Mode-S code A18E0A 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 A18E0A broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A18E0A, octal 50307012, decimal 10,587,658.
What flights does A18E0A operate?
Mode-S A18E0A has broadcast 1 distinct callsign, including 2HK.