Apparatus

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sensors Mode-S transponder

A8D3C1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N668UP · operated by WHEELS UP PARTNERS LLC

Hex
A8D3C1
Octal
52151701
Decimal
11,064,257
Country
US
Tail
N668UP
Type
E55P
No current signal · last broadcast 5h ago
Flights observed
255
Distinct callsigns
1
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A8D3C1.

Country allocation

The ICAO 24-bit address A8D3C1 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
WUP668 - 255 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 WUP668 - Jul 23, 23:50 UTCJul 24, 00:15 UTC25m
2026-07-23 WUP668 - Jul 23, 22:20 UTCJul 23, 23:05 UTC45m
2026-07-23 WUP668 - Jul 23, 19:10 UTCJul 23, 20:45 UTC1h 35m
2026-07-23 WUP668 - Jul 23, 16:25 UTCJul 23, 18:10 UTC1h 45m
2026-07-23 WUP668 - Jul 23, 13:10 UTCJul 23, 14:45 UTC1h 35m
2026-07-21 WUP668 - Jul 21, 20:30 UTCJul 21, 22:20 UTC1h 50m
2026-07-21 WUP668 - Jul 21, 18:25 UTCJul 21, 19:45 UTC1h 20m
2026-07-21 WUP668 - Jul 21, 16:10 UTCJul 21, 17:25 UTC1h 15m
2026-07-21 WUP668 - Jul 21, 12:05 UTCJul 21, 14:25 UTC2h 20m
2026-07-20 WUP668 - Jul 20, 22:25 UTCJul 20, 22:50 UTC25m
2026-07-20 WUP668 - Jul 20, 20:00 UTCJul 20, 21:35 UTC1h 35m
2026-07-20 WUP668 - Jul 20, 14:30 UTCJul 20, 18:30 UTC4h 0m
2026-07-19 WUP668 VNY → SLC Jul 19, 22:15 UTCJul 19, 23:45 UTC1h 30m
2026-07-19 WUP668 - Jul 19, 20:35 UTCJul 19, 21:25 UTC50m
2026-07-19 WUP668 - Jul 19, 17:25 UTCJul 19, 18:05 UTC40m
2026-07-19 WUP668 - Jul 19, 15:25 UTCJul 19, 16:25 UTC1h 0m
2026-07-18 WUP668 - Jul 18, 19:40 UTCJul 18, 23:05 UTC3h 25m
2026-07-18 WUP668 - Jul 18, 17:00 UTCJul 18, 18:35 UTC1h 35m
2026-07-17 WUP668 - Jul 17, 15:44 UTCJul 17, 17:15 UTC1h 30m
2026-07-17 WUP668 - Jul 17, 12:45 UTCJul 17, 14:50 UTC2h 5m
2026-07-16 WUP668 - Jul 16, 21:00 UTCJul 16, 21:50 UTC50m
2026-07-16 WUP668 - Jul 16, 18:44 UTCJul 16, 20:05 UTC1h 20m
2026-07-16 WUP668 - Jul 16, 15:45 UTCJul 16, 16:30 UTC45m
2026-07-16 WUP668 - Jul 16, 12:05 UTCJul 16, 14:45 UTC2h 40m
2026-07-15 WUP668 - Jul 15, 20:35 UTCJul 15, 21:00 UTC25m
2026-07-15 WUP668 - Jul 15, 16:40 UTCJul 15, 19:35 UTC2h 55m
2026-07-15 WUP668 - Jul 15, 14:25 UTCJul 15, 15:20 UTC55m
2026-07-15 WUP668 - Jul 15, 14:10 UTCJul 15, 14:15 UTC5m
2026-07-15 WUP668 - Jul 15, 00:35 UTCJul 15, 01:25 UTC50m
2026-07-14 WUP668 - Jul 14, 20:55 UTCJul 14, 23:35 UTC2h 39m
2026-07-14 WUP668 - Jul 14, 18:35 UTCJul 14, 19:10 UTC35m
2026-07-14 WUP668 - Jul 14, 10:05 UTCJul 14, 14:30 UTC4h 25m
2026-07-13 WUP668 - Jul 13, 20:55 UTCJul 13, 23:20 UTC2h 25m
2026-07-13 WUP668 - Jul 13, 18:50 UTCJul 13, 19:40 UTC50m
2026-07-13 WUP668 - Jul 13, 16:45 UTCJul 13, 17:35 UTC50m
2026-07-13 WUP668 - Jul 13, 13:55 UTCJul 13, 15:15 UTC1h 20m
2026-07-12 WUP668 - Jul 12, 21:25 UTCJul 13, 00:01 UTC2h 35m
2026-07-12 WUP668 CLL → MIA Jul 12, 17:30 UTCJul 12, 20:05 UTC2h 35m
2026-07-11 WUP668 LAS → CLL Jul 11, 05:25 UTCJul 11, 08:05 UTC2h 40m
2026-07-10 WUP668 SBA → LAS Jul 10, 16:10 UTCJul 10, 17:05 UTC55m
2026-07-10 WUP668 - Jul 10, 14:15 UTCJul 10, 15:05 UTC50m
2026-07-09 WUP668 - Jul 9, 20:30 UTCJul 9, 21:05 UTC35m
2026-07-09 WUP668 - Jul 9, 16:15 UTCJul 9, 19:25 UTC3h 10m
2026-07-09 WUP668 - Jul 9, 12:55 UTCJul 9, 14:50 UTC1h 55m
2026-07-08 WUP668 - Jul 8, 20:50 UTCJul 8, 22:35 UTC1h 45m
2026-07-08 WUP668 - Jul 8, 18:10 UTCJul 8, 20:05 UTC1h 55m
2026-07-08 WUP668 - Jul 8, 15:15 UTCJul 8, 17:00 UTC1h 45m
2026-07-08 WUP668 - Jul 8, 13:15 UTCJul 8, 14:15 UTC1h 0m
2026-07-07 WUP668 - Jul 7, 18:25 UTCJul 7, 22:05 UTC3h 40m
2026-07-07 WUP668 - Jul 7, 16:05 UTCJul 7, 17:05 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 N668UP page for operator, model, and routing details .

Mode-S A8D3C1 frequently asked

What is Mode-S code A8D3C1?
A8D3C1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N668UP.
Where is Mode-S A8D3C1 registered?
Mode-S code A8D3C1 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 A8D3C1 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8D3C1, octal 52151701, decimal 11,064,257.
What flights does A8D3C1 operate?
Mode-S A8D3C1 has broadcast 1 distinct callsign, including WUP668.