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sensors Mode-S transponder

A18D1A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1998R · CESSNA 172R Cutlass RG · operated by A & E FLYING CLUB OF LOS ANGELES INC

Hex
A18D1A
Octal
50306432
Decimal
10,587,418
Country
US
Tail
N1998R
Type
C72R
No current signal · last broadcast Jul 14, 00:25 UTC
Flights observed
133
Distinct callsigns
1
Country
US
Last broadcast
Jul 14, 00:25 UTC

Last known position

Most recent position reported by Mode-S A18D1A.

Country allocation

The ICAO 24-bit address A18D1A 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
N1998R - 133 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N1998R - Jul 13, 23:00 UTCJul 14, 00:25 UTC1h 25m
2026-07-13 N1998R HHR → HHR Jul 13, 20:25 UTCJul 13, 21:20 UTC55m
2026-07-11 N1998R AVX → HHR Jul 11, 22:25 UTCJul 11, 22:50 UTC25m
2026-07-10 N1998R - Jul 10, 20:15 UTCJul 10, 20:40 UTC25m
2026-07-10 N1998R - Jul 10, 05:25 UTCJul 10, 05:50 UTC25m
2026-07-10 N1998R CPM → CCB Jul 10, 00:00 UTCJul 10, 00:25 UTC25m
2026-07-08 N1998R - Jul 8, 00:30 UTCJul 8, 01:35 UTC1h 5m
2026-07-07 N1998R - Jul 7, 22:35 UTCJul 7, 23:15 UTC40m
2026-07-07 N1998R - Jul 7, 20:45 UTCJul 7, 21:20 UTC35m
2026-07-07 N1998R - Jul 7, 19:10 UTCJul 7, 19:50 UTC40m
2026-07-07 N1998R - Jul 7, 02:45 UTCJul 7, 03:30 UTC45m
2026-07-06 N1998R - Jul 6, 21:20 UTCJul 6, 22:45 UTC1h 25m
2026-07-05 N1998R HHR → HHR Jul 5, 23:15 UTCJul 6, 00:10 UTC55m
2026-07-05 N1998R HHR → HHR Jul 5, 19:40 UTCJul 5, 21:10 UTC1h 30m
2026-07-04 N1998R - Jul 4, 20:25 UTCJul 4, 20:40 UTC15m
2026-07-04 N1998R - Jul 4, 18:35 UTCJul 4, 18:50 UTC15m
2026-07-03 N1998R - Jul 3, 21:30 UTCJul 3, 21:50 UTC20m
2026-07-03 N1998R - Jul 3, 20:05 UTCJul 3, 20:20 UTC15m
2026-07-01 N1998R SBD → HHR Jul 1, 22:35 UTCJul 1, 23:10 UTC35m
2026-07-01 N1998R - Jul 1, 18:20 UTCJul 1, 19:05 UTC45m
2026-06-30 N1998R - Jun 30, 22:55 UTCJul 1, 00:35 UTC1h 40m
2026-06-30 N1998R HHR → HHR Jun 30, 19:35 UTCJun 30, 20:30 UTC55m
2026-06-30 N1998R HHR → HHR Jun 30, 17:35 UTCJun 30, 18:05 UTC30m
2026-06-30 N1998R CPM → HHR Jun 30, 02:35 UTCJun 30, 03:05 UTC30m
2026-06-29 N1998R HHR → HHR Jun 29, 23:44 UTCJun 30, 00:35 UTC50m
2026-06-29 N1998R - Jun 29, 20:30 UTCJun 29, 21:24 UTC55m
2026-06-29 N1998R HHR → HHR Jun 29, 18:49 UTCJun 29, 19:09 UTC20m
2026-06-29 N1998R - Jun 29, 16:00 UTCJun 29, 16:35 UTC35m
2026-06-28 N1998R - Jun 28, 21:34 UTCJun 28, 22:24 UTC50m
2026-06-27 N1998R - Jun 27, 22:15 UTCJun 27, 23:10 UTC55m
2026-06-26 N1998R HHR → HHR Jun 26, 20:34 UTCJun 26, 22:05 UTC1h 30m
2026-06-26 N1998R - Jun 26, 17:04 UTCJun 26, 18:49 UTC1h 45m
2026-06-19 N1998R HHR → CPM Jun 19, 16:49 UTCJun 19, 17:04 UTC15m
2026-06-18 N1998R HHR → HHR Jun 18, 01:35 UTCJun 18, 02:30 UTC55m
2026-06-17 N1998R HHR → HHR Jun 17, 21:15 UTCJun 17, 22:30 UTC1h 15m
2026-06-17 N1998R - Jun 17, 00:05 UTCJun 17, 01:25 UTC1h 20m
2026-06-16 N1998R - Jun 16, 20:45 UTCJun 16, 21:50 UTC1h 5m
2026-06-16 N1998R - Jun 16, 01:55 UTCJun 16, 03:00 UTC1h 5m
2026-06-15 N1998R - Jun 15, 23:09 UTCJun 16, 00:15 UTC1h 5m
2026-06-15 N1998R - Jun 15, 19:55 UTCJun 15, 21:04 UTC1h 10m
2026-06-14 N1998R AVX → HHR Jun 14, 22:30 UTCJun 14, 23:00 UTC30m
2026-06-14 N1998R - Jun 14, 19:55 UTCJun 14, 20:20 UTC25m
2026-06-13 N1998R HHR → HHR Jun 13, 20:05 UTCJun 13, 21:00 UTC55m
2026-06-12 N1998R - Jun 12, 19:50 UTCJun 12, 21:15 UTC1h 25m
2026-06-12 N1998R - Jun 12, 17:50 UTCJun 12, 18:15 UTC25m
2026-06-11 N1998R - Jun 11, 20:35 UTCJun 11, 21:25 UTC50m
2026-06-11 N1998R - Jun 11, 01:20 UTCJun 11, 02:00 UTC40m
2026-06-10 N1998R HHR → HHR Jun 10, 19:50 UTCJun 10, 21:05 UTC1h 15m
2026-06-10 N1998R - Jun 10, 16:55 UTCJun 10, 18:25 UTC1h 30m
2026-06-09 N1998R - Jun 9, 02:40 UTCJun 9, 03:30 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 N1998R page for operator, model, and routing details .

Mode-S A18D1A frequently asked

What is Mode-S code A18D1A?
A18D1A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1998R.
Where is Mode-S A18D1A registered?
Mode-S code A18D1A 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 A18D1A broadcasting right now?
No active broadcast right now. Last signal was Jul 14, 00:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A18D1A, octal 50306432, decimal 10,587,418.
What flights does A18D1A operate?
Mode-S A18D1A has broadcast 1 distinct callsign, including N1998R.