Apparatus

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sensors Mode-S transponder

A1D8D5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N218SL · BEECH 1900 · operated by ALPINE AVIATION INC

Hex
A1D8D5
Octal
50354325
Decimal
10,606,805
Country
US
Tail
N218SL
Type
B190
No current signal · last broadcast 2d ago
Flights observed
53
Distinct callsigns
14
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A1D8D5.

Country allocation

The ICAO 24-bit address A1D8D5 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 14 distinct

Callsign Airline Flights Last seen
AIP8941 Alpine Air Express 24 2026-06-10
AIP8943 Alpine Air Express 6 2026-06-11
AIP357 Alpine Air Express 4 2026-05-09
AIP540 Alpine Air Express 3 2026-05-22
AIP529 Alpine Air Express 3 2026-05-17
AIP8956 Alpine Air Express 2 2026-05-02
AIP8955 Alpine Air Express 2 2026-05-02
AIP513 Alpine Air Express 2 2026-05-07
AIP223 Alpine Air Express 2 2026-05-20
AIP707 Alpine Air Express 1 2026-05-02
AIP532 Alpine Air Express 1 2026-05-20
AIP508 Alpine Air Express 1 2026-05-05
AIP435 Alpine Air Express 1 2026-04-23
AIP23 Alpine Air Express 1 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-11 AIP8943 GDC → PIB Jun 11, 20:30 UTCJun 11, 22:10 UTC1h 40m
2026-06-11 AIP8943 GDC → PIB Jun 11, 18:05 UTCJun 11, 19:55 UTC1h 50m
2026-06-10 AIP8941 PIB → GDC Jun 10, 20:50 UTCJun 10, 22:50 UTC2h 0m
2026-06-10 AIP8941 PIB → GDC Jun 10, 05:25 UTCJun 10, 06:15 UTC50m
2026-06-10 AIP8941 PIB → GDC Jun 10, 01:40 UTCJun 10, 04:05 UTC2h 25m
2026-06-09 AIP8941 PIB → GDC Jun 9, 23:35 UTCJun 10, 01:00 UTC1h 25m
2026-06-09 AIP8941 PIB → GDC Jun 9, 20:10 UTCJun 9, 22:10 UTC2h 0m
2026-06-09 AIP8941 PIB → GDC Jun 9, 02:00 UTCJun 9, 05:20 UTC3h 20m
2026-06-08 AIP8941 PIB → GDC Jun 8, 23:55 UTCJun 9, 01:25 UTC1h 30m
2026-06-08 AIP8941 PIB → GDC Jun 8, 20:40 UTCJun 8, 22:45 UTC2h 5m
2026-06-08 AIP8941 PIB → GDC Jun 8, 01:35 UTCJun 8, 05:10 UTC3h 35m
2026-06-07 AIP8941 PIB → GDC Jun 7, 23:10 UTCJun 8, 00:55 UTC1h 45m
2026-06-07 AIP8941 PIB → GDC Jun 7, 19:30 UTCJun 7, 21:00 UTC1h 30m
2026-05-28 AIP8943 GDC → PIB May 28, 19:20 UTCMay 28, 21:00 UTC1h 40m
2026-05-28 AIP8943 GDC → PIB May 28, 15:20 UTCMay 28, 17:15 UTC1h 55m
2026-05-27 AIP8941 PIB → GDC May 27, 23:25 UTCMay 28, 05:05 UTC5h 40m
2026-05-27 AIP8941 PIB → GDC May 27, 20:20 UTCMay 27, 22:15 UTC1h 55m
2026-05-23 AIP8941 PIB → GDC May 23, 01:40 UTCMay 23, 05:00 UTC3h 19m
2026-05-22 AIP8941 PIB → GDC May 22, 23:10 UTCMay 23, 01:05 UTC1h 55m
2026-05-22 AIP540 PGA → OAK May 22, 04:30 UTCMay 22, 05:15 UTC45m
2026-05-22 AIP540 PGA → OAK May 22, 02:15 UTCMay 22, 04:05 UTC1h 50m
2026-05-21 AIP540 PGA → OAK May 21, 23:30 UTCMay 21, 23:45 UTC15m
2026-05-21 AIP8941 PIB → GDC May 21, 04:40 UTCMay 21, 05:30 UTC50m
2026-05-21 AIP8941 PIB → GDC May 21, 01:50 UTCMay 21, 04:10 UTC2h 20m
2026-05-20 AIP8941 PIB → GDC May 20, 23:40 UTCMay 21, 01:10 UTC1h 30m
2026-05-20 AIP223 BIL → HLN May 20, 03:10 UTCMay 20, 03:50 UTC40m
2026-05-20 AIP532 IND → AUO May 20, 00:35 UTCMay 20, 02:40 UTC2h 5m
2026-05-19 AIP223 BIL → HLN May 19, 21:50 UTCMay 19, 22:10 UTC20m
2026-05-18 AIP8941 PIB → GDC May 18, 01:45 UTCMay 18, 05:15 UTC3h 30m
2026-05-17 AIP8941 PIB → GDC May 17, 23:25 UTCMay 18, 01:00 UTC1h 35m
2026-05-17 AIP529 - May 17, 18:10 UTCMay 17, 18:50 UTC40m
2026-05-17 AIP529 - May 17, 00:55 UTCMay 17, 02:45 UTC1h 50m
2026-05-16 AIP529 - May 16, 23:55 UTCMay 17, 00:05 UTC10m
2026-05-11 AIP8941 PIB → GDC May 11, 01:30 UTCMay 11, 04:50 UTC3h 20m
2026-05-10 AIP8941 PIB → GDC May 10, 23:35 UTCMay 11, 00:45 UTC1h 10m
2026-05-09 AIP357 RIC → FSD May 9, 19:10 UTCMay 9, 22:15 UTC3h 5m
2026-05-09 AIP357 RIC → FSD May 9, 16:50 UTCMay 9, 17:49 UTC1h 0m
2026-05-07 AIP513 MKG → IND May 7, 06:05 UTCMay 7, 08:50 UTC2h 45m
2026-05-06 AIP513 MKG → IND May 6, 21:40 UTCMay 7, 01:25 UTC3h 45m
2026-05-06 AIP357 RIC → FSD May 6, 01:50 UTCMay 6, 02:15 UTC25m
2026-05-05 AIP508 IND → AUO May 5, 23:50 UTCMay 6, 01:35 UTC1h 45m
2026-05-02 AIP707 BFI → TUS May 2, 12:30 UTCMay 2, 14:40 UTC2h 10m
2026-05-02 AIP8955 BUF → ELM May 2, 11:15 UTCMay 2, 11:40 UTC25m
2026-05-02 AIP8956 IND → ELM May 2, 00:45 UTCMay 2, 01:10 UTC25m
2026-05-01 AIP8955 BUF → ELM May 1, 11:00 UTCMay 1, 11:25 UTC25m
2026-05-01 AIP8956 IND → ELM May 1, 00:40 UTCMay 1, 01:05 UTC25m
2026-04-30 AIP357 RIC → FSD Apr 30, 22:05 UTCApr 30, 23:55 UTC1h 50m
2026-04-30 AIP8943 GDC → PIB Apr 30, 20:00 UTCApr 30, 21:10 UTC1h 10m
2026-04-30 AIP8943 GDC → PIB Apr 30, 16:30 UTCApr 30, 18:25 UTC1h 55m
2026-04-30 AIP8941 PIB → GDC Apr 30, 04:05 UTCApr 30, 07:35 UTC3h 30m

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 N218SL page for operator, model, and routing details .

Mode-S A1D8D5 frequently asked

What is Mode-S code A1D8D5?
A1D8D5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N218SL.
Where is Mode-S A1D8D5 registered?
Mode-S code A1D8D5 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 A1D8D5 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1D8D5, octal 50354325, decimal 10,606,805.
What flights does A1D8D5 operate?
Mode-S A1D8D5 has broadcast 14 distinct callsigns, including AIP8941, AIP8943, AIP357, AIP540, AIP529.