Apparatus

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sensors Mode-S transponder

A41941

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N363UP · BOEING 767-300 · operated by UNITED PARCEL SERVICE CO

Hex
A41941
Octal
51014501
Decimal
10,754,369
Country
US
Tail
N363UP
Type
B763
No current signal · last broadcast 10h ago
Flights observed
86
Distinct callsigns
16
Country
US
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S A41941.

Country allocation

The ICAO 24-bit address A41941 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 16 distinct

Callsign Airline Flights Last seen
UPS257 United Parcel Service 19 2026-05-29
UPS256 United Parcel Service 17 2026-05-29
UPS267 United Parcel Service 7 2026-05-07
UPS266 United Parcel Service 7 2026-05-07
UPS269 United Parcel Service 6 2026-05-18
UPS268 United Parcel Service 6 2026-05-18
UPS260 United Parcel Service 3 2026-05-15
UPS259 United Parcel Service 3 2026-05-15
UPS239 United Parcel Service 3 2026-05-17
UPS234 United Parcel Service 3 2026-05-17
UPS285 United Parcel Service 2 2026-04-21
UPS284 United Parcel Service 2 2026-04-21
UPS249 United Parcel Service 2 2026-04-13
UPS248 United Parcel Service 2 2026-04-13
UPS243 United Parcel Service 2 2026-05-14
UPS242 United Parcel Service 2 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 UPS257 MAD → MAD May 29, 21:05 UTCMay 29, 23:00 UTC1h 55m
2026-05-29 UPS256 CGN → MAD May 29, 01:55 UTCMay 29, 03:45 UTC1h 50m
2026-05-28 UPS257 MAD → MAD May 28, 21:15 UTCMay 28, 23:25 UTC2h 10m
2026-05-28 UPS256 CGN → MAD May 28, 01:45 UTCMay 28, 03:45 UTC2h 0m
2026-05-27 UPS257 MAD → MAD May 27, 20:45 UTCMay 27, 22:45 UTC2h 0m
2026-05-27 UPS256 CGN → MAD May 27, 01:59 UTCMay 27, 03:59 UTC2h 0m
2026-05-26 UPS257 MAD → MAD May 26, 20:50 UTCMay 26, 22:50 UTC2h 0m
2026-05-26 UPS256 CGN → MAD May 26, 01:30 UTCMay 26, 03:30 UTC2h 0m
2026-05-25 UPS257 MAD → MAD May 25, 20:55 UTCMay 25, 22:44 UTC1h 50m
2026-05-25 UPS256 CGN → MAD May 25, 01:55 UTCMay 25, 02:20 UTC25m
2026-05-22 UPS257 MAD → MAD May 22, 20:50 UTCMay 22, 22:55 UTC2h 5m
2026-05-22 UPS256 CGN → MAD May 22, 01:50 UTCMay 22, 03:50 UTC2h 0m
2026-05-21 UPS257 MAD → MAD May 21, 20:50 UTCMay 21, 22:50 UTC2h 0m
2026-05-21 UPS256 CGN → MAD May 21, 01:45 UTCMay 21, 03:40 UTC1h 55m
2026-05-20 UPS257 MAD → MAD May 20, 20:55 UTCMay 20, 23:20 UTC2h 25m
2026-05-20 UPS256 CGN → MAD May 20, 01:50 UTCMay 20, 03:50 UTC2h 0m
2026-05-19 UPS257 MAD → MAD May 19, 20:55 UTCMay 19, 23:10 UTC2h 15m
2026-05-19 UPS256 CGN → MAD May 19, 01:35 UTCMay 19, 03:30 UTC1h 55m
2026-05-18 UPS269 IST → IST May 18, 19:40 UTCMay 18, 22:20 UTC2h 40m
2026-05-18 UPS268 CGN → IST May 18, 02:25 UTCMay 18, 04:45 UTC2h 20m
2026-05-17 UPS239 EMA → CGN May 17, 22:50 UTCMay 17, 23:50 UTC1h 0m
2026-05-17 UPS234 CGN → EMA May 17, 20:40 UTCMay 17, 21:40 UTC1h 0m
2026-05-15 UPS259 CIA → CGN May 15, 21:45 UTCMay 15, 22:55 UTC1h 10m
2026-05-15 UPS260 CGN → VCE May 15, 02:00 UTCMay 15, 03:00 UTC1h 0m
2026-05-14 UPS243 BCN → VLC May 14, 21:30 UTCMay 14, 23:05 UTC1h 35m
2026-05-14 UPS243 BCN → VLC May 14, 19:35 UTCMay 14, 20:15 UTC40m
2026-05-14 UPS242 BCN → VLC May 14, 04:35 UTCMay 14, 05:10 UTC35m
2026-05-14 UPS242 BCN → VLC May 14, 01:40 UTCMay 14, 03:30 UTC1h 50m
2026-05-13 UPS259 CIA → CGN May 13, 20:50 UTCMay 13, 22:05 UTC1h 15m
2026-05-13 UPS260 CGN → VCE May 13, 02:10 UTCMay 13, 03:10 UTC1h 0m
2026-05-12 UPS257 MAD → MAD May 12, 20:55 UTCMay 12, 22:50 UTC1h 55m
2026-05-12 UPS256 CGN → MAD May 12, 02:45 UTCMay 12, 03:40 UTC55m
2026-05-11 UPS257 MAD → MAD May 11, 20:50 UTCMay 11, 22:35 UTC1h 44m
2026-05-11 UPS256 CGN → MAD May 11, 00:34 UTCMay 11, 02:35 UTC2h 0m
2026-05-08 UPS269 IST → IST May 8, 20:25 UTCMay 8, 23:05 UTC2h 40m
2026-05-08 UPS268 CGN → IST May 8, 02:24 UTCMay 8, 04:39 UTC2h 15m
2026-05-07 UPS267 IST → TLV May 7, 21:20 UTCMay 7, 23:05 UTC1h 44m
2026-05-07 UPS266 CGN → LCA May 7, 01:45 UTCMay 7, 03:15 UTC1h 30m
2026-05-06 UPS259 CIA → CGN May 6, 21:00 UTCMay 6, 22:10 UTC1h 10m
2026-05-06 UPS260 CGN → VCE May 6, 02:01 UTCMay 6, 03:05 UTC1h 4m
2026-05-05 UPS269 IST → IST May 5, 19:45 UTCMay 5, 22:20 UTC2h 35m
2026-05-05 UPS268 CGN → IST May 5, 02:25 UTCMay 5, 04:40 UTC2h 15m
2026-05-04 UPS267 IST → TLV May 4, 21:10 UTCMay 4, 22:55 UTC1h 45m
2026-05-04 UPS266 CGN → LCA May 4, 01:30 UTCMay 4, 02:54 UTC1h 25m
2026-04-30 UPS257 MAD → MAD Apr 30, 21:10 UTCApr 30, 23:25 UTC2h 15m
2026-04-30 UPS256 CGN → MAD Apr 30, 01:40 UTCApr 30, 03:45 UTC2h 5m
2026-04-29 UPS267 IST → TLV Apr 29, 21:15 UTCApr 29, 23:15 UTC1h 59m
2026-04-29 UPS266 CGN → LCA Apr 29, 01:50 UTCApr 29, 03:15 UTC1h 25m
2026-04-28 UPS267 IST → TLV Apr 28, 22:20 UTCApr 28, 23:54 UTC1h 35m
2026-04-28 UPS266 CGN → LCA Apr 28, 01:50 UTCApr 28, 03:20 UTC1h 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 N363UP page for operator, model, and routing details .

Mode-S A41941 frequently asked

What is Mode-S code A41941?
A41941 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N363UP.
Where is Mode-S A41941 registered?
Mode-S code A41941 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 A41941 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A41941, octal 51014501, decimal 10,754,369.
What flights does A41941 operate?
Mode-S A41941 has broadcast 16 distinct callsigns, including UPS257, UPS256, UPS267, UPS266, UPS269.