Apparatus

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sensors Mode-S transponder

ADD16D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N99MR · BOMBARDIER BD-100 Challenger 300 · operated by WHEELS UP PARTNERS LLC

Hex
ADD16D
Octal
53350555
Decimal
11,391,341
Country
US
Tail
N99MR
Type
CL30
No current signal · last broadcast 11d ago
Flights observed
158
Distinct callsigns
1
Country
US
Last broadcast
11d ago

Last known position

Most recent position reported by Mode-S ADD16D.

Country allocation

The ICAO 24-bit address ADD16D 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
WUP945 - 158 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-02 WUP945 - Jul 2, 23:00 UTCJul 3, 01:10 UTC2h 10m
2026-07-02 WUP945 OAK → HYA Jul 2, 16:25 UTCJul 2, 21:40 UTC5h 15m
2026-07-01 WUP945 - Jul 1, 14:50 UTCJul 1, 21:50 UTC7h 0m
2026-06-30 WUP945 - Jun 30, 18:15 UTCJun 30, 19:45 UTC1h 30m
2026-06-30 WUP945 ATL → SBM Jun 30, 15:40 UTCJun 30, 17:25 UTC1h 45m
2026-06-30 WUP945 - Jun 30, 04:45 UTCJun 30, 06:20 UTC1h 35m
2026-06-30 WUP945 - Jun 30, 00:25 UTCJun 30, 03:45 UTC3h 21m
2026-06-29 WUP945 - Jun 29, 19:05 UTCJun 29, 21:54 UTC2h 50m
2026-06-29 WUP945 - Jun 29, 15:49 UTCJun 29, 18:10 UTC2h 20m
2026-06-29 WUP945 - Jun 29, 13:44 UTCJun 29, 14:34 UTC50m
2026-06-28 WUP945 - Jun 28, 14:59 UTCJun 28, 17:04 UTC2h 5m
2026-06-27 WUP945 - Jun 27, 22:40 UTCJun 28, 00:50 UTC2h 10m
2026-06-27 WUP945 - Jun 27, 17:09 UTCJun 27, 21:40 UTC4h 30m
2026-06-27 WUP945 SBA → SJC Jun 27, 14:39 UTCJun 27, 15:24 UTC45m
2026-06-23 WUP945 CLD → SBA Jun 23, 21:59 UTCJun 23, 22:34 UTC35m
2026-06-23 WUP945 - Jun 23, 16:59 UTCJun 23, 21:05 UTC4h 5m
2026-06-21 WUP945 - Jun 21, 19:00 UTCJun 21, 20:45 UTC1h 45m
2026-06-21 WUP945 - Jun 21, 16:04 UTCJun 21, 18:04 UTC2h 0m
2026-06-20 WUP945 - Jun 20, 18:10 UTCJun 20, 19:49 UTC1h 40m
2026-06-20 WUP945 - Jun 20, 14:05 UTCJun 20, 16:34 UTC2h 30m
2026-06-19 WUP945 - Jun 19, 22:55 UTCJun 20, 02:49 UTC3h 55m
2026-06-19 WUP945 - Jun 19, 18:14 UTCJun 19, 21:14 UTC3h 0m
2026-06-18 WUP945 PIE → PVD Jun 18, 16:55 UTCJun 18, 19:30 UTC2h 35m
2026-06-18 WUP945 RSW → PIE Jun 18, 14:30 UTCJun 18, 15:00 UTC30m
2026-06-18 WUP945 - Jun 18, 12:25 UTCJun 18, 13:45 UTC1h 20m
2026-06-17 WUP945 - Jun 17, 21:00 UTCJun 17, 21:20 UTC20m
2026-06-17 WUP945 - Jun 17, 18:05 UTCJun 17, 20:00 UTC1h 55m
2026-06-16 WUP945 - Jun 16, 19:25 UTCJun 16, 20:50 UTC1h 26m
2026-06-16 WUP945 - Jun 16, 14:35 UTCJun 16, 18:09 UTC3h 35m
2026-06-15 WUP945 - Jun 15, 15:55 UTCJun 15, 17:15 UTC1h 20m
2026-06-15 WUP945 - Jun 15, 13:05 UTCJun 15, 15:15 UTC2h 10m
2026-06-14 WUP945 - Jun 14, 21:05 UTCJun 14, 22:30 UTC1h 25m
2026-06-14 WUP945 - Jun 14, 19:35 UTCJun 14, 20:05 UTC30m
2026-06-14 WUP945 - Jun 14, 17:10 UTCJun 14, 19:00 UTC1h 50m
2026-06-14 WUP945 - Jun 14, 15:25 UTCJun 14, 16:30 UTC1h 5m
2026-06-13 WUP945 - Jun 13, 18:10 UTCJun 13, 18:20 UTC10m
2026-06-13 WUP945 - Jun 13, 13:00 UTCJun 13, 17:20 UTC4h 20m
2026-06-12 WUP945 - Jun 12, 21:35 UTCJun 12, 21:50 UTC15m
2026-06-12 WUP945 - Jun 12, 16:40 UTCJun 12, 20:50 UTC4h 10m
2026-06-12 WUP945 - Jun 12, 11:50 UTCJun 12, 15:00 UTC3h 10m
2026-06-10 WUP945 - Jun 10, 21:10 UTCJun 11, 00:25 UTC3h 15m
2026-06-10 WUP945 - Jun 10, 14:40 UTCJun 10, 19:40 UTC5h 0m
2026-06-09 WUP945 - Jun 9, 21:45 UTCJun 9, 22:05 UTC20m
2026-06-09 WUP945 - Jun 9, 17:15 UTCJun 9, 21:00 UTC3h 45m
2026-06-09 WUP945 - Jun 9, 14:30 UTCJun 9, 15:50 UTC1h 20m
2026-06-08 WUP945 - Jun 8, 20:20 UTCJun 8, 20:55 UTC35m
2026-06-08 WUP945 - Jun 8, 17:05 UTCJun 8, 17:40 UTC35m
2026-06-08 WUP945 - Jun 8, 15:04 UTCJun 8, 15:25 UTC20m
2026-06-08 WUP945 - Jun 8, 00:40 UTCJun 8, 01:10 UTC30m
2026-06-07 WUP945 BWI → SLC Jun 7, 17:20 UTCJun 7, 23:10 UTC5h 50m

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 N99MR page for operator, model, and routing details .

Mode-S ADD16D frequently asked

What is Mode-S code ADD16D?
ADD16D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N99MR.
Where is Mode-S ADD16D registered?
Mode-S code ADD16D 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 ADD16D broadcasting right now?
No active broadcast right now. Last signal was 11d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADD16D, octal 53350555, decimal 11,391,341.
What flights does ADD16D operate?
Mode-S ADD16D has broadcast 1 distinct callsign, including WUP945.