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sensors Mode-S transponder

A3D1B1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N345UP · BOEING 767-300 · operated by UNITED PARCEL SERVICE CO

Hex
A3D1B1
Octal
50750661
Decimal
10,736,049
Country
US
Tail
N345UP
Type
B763
No current signal · last broadcast Jul 26, 06:10 UTC
Flights observed
400
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 06:10 UTC

Last known position

Most recent position reported by Mode-S A3D1B1.

Country allocation

The ICAO 24-bit address A3D1B1 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 20 distinct

Callsign Airline Flights Last seen
UPS167 United Parcel Service 19 2026-07-24
UPS166 United Parcel Service 19 2026-07-26
UPS137 - 14 2026-07-23
UPS104 - 14 2026-06-15
UPS127 - 12 2026-07-20
UPS2463 United Parcel Service 11 2026-05-12
UPS2462 United Parcel Service 11 2026-05-12
UPS195 - 10 2026-07-24
UPS138 United Parcel Service 10 2026-07-22
UPS196 - 9 2026-07-23
UPS126 - 8 2026-07-21
UPS208 - 7 2026-06-13
UPS136 - 7 2026-07-23
UPS118 United Parcel Service 7 2026-07-22
UPS237 United Parcel Service 6 2026-06-11
UPS168 - 5 2026-07-05
UPS125 - 5 2026-07-21
UPS124 - 5 2026-07-21
UPS923 United Parcel Service 4 2026-05-22
UPS918 United Parcel Service 4 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UPS166 HKG → SIN Jul 26, 05:40 UTCJul 26, 06:10 UTC30m
2026-07-25 UPS166 HKG → SIN Jul 25, 12:30 UTCJul 25, 14:30 UTC2h 0m
2026-07-24 UPS167 SIN → SZX Jul 24, 22:35 UTCJul 24, 23:05 UTC30m
2026-07-24 UPS167 SIN → SZX Jul 24, 19:45 UTCJul 24, 19:55 UTC10m
2026-07-24 UPS195 - Jul 24, 16:05 UTCJul 24, 16:20 UTC15m
2026-07-24 UPS195 - Jul 24, 13:20 UTCJul 24, 13:55 UTC35m
2026-07-24 UPS173 - Jul 24, 10:15 UTCJul 24, 10:50 UTC35m
2026-07-24 UPS174 - Jul 24, 04:45 UTCJul 24, 05:10 UTC25m
2026-07-23 UPS196 - Jul 23, 22:25 UTCJul 23, 23:05 UTC40m
2026-07-23 UPS137 - Jul 23, 18:15 UTCJul 23, 18:35 UTC20m
2026-07-23 UPS137 - Jul 23, 16:45 UTCJul 23, 17:15 UTC30m
2026-07-23 UPS136 - Jul 23, 06:40 UTCJul 23, 15:00 UTC8h 20m
2026-07-22 UPS138 SZX → SYD Jul 22, 20:15 UTCJul 23, 04:55 UTC8h 40m
2026-07-22 UPS118 NRT → SZX Jul 22, 16:15 UTCJul 22, 16:40 UTC25m
2026-07-22 UPS118 NRT → SZX Jul 22, 12:45 UTCJul 22, 14:15 UTC1h 30m
2026-07-21 UPS119 SZX → NRT Jul 21, 20:20 UTCJul 22, 00:15 UTC3h 55m
2026-07-21 UPS126 - Jul 21, 16:50 UTCJul 21, 17:20 UTC30m
2026-07-21 UPS126 - Jul 21, 13:45 UTCJul 21, 14:45 UTC1h 0m
2026-07-21 UPS125 - Jul 21, 11:30 UTCJul 21, 12:15 UTC45m
2026-07-21 UPS124 - Jul 21, 01:15 UTCJul 21, 01:40 UTC25m
2026-07-20 UPS127 - Jul 20, 23:05 UTCJul 21, 00:00 UTC54m
2026-07-20 UPS127 - Jul 20, 20:50 UTCJul 20, 21:05 UTC15m
2026-07-18 UPS166 - Jul 18, 19:05 UTCJul 18, 19:20 UTC15m
2026-07-18 UPS166 - Jul 18, 14:25 UTCJul 18, 14:45 UTC20m
2026-07-18 UPS166 - Jul 18, 12:55 UTCJul 18, 13:15 UTC20m
2026-07-17 UPS167 - Jul 17, 22:35 UTCJul 17, 23:05 UTC30m
2026-07-17 UPS167 - Jul 17, 19:45 UTCJul 17, 19:55 UTC10m
2026-07-17 UPS195 - Jul 17, 16:29 UTCJul 17, 16:44 UTC15m
2026-07-17 UPS195 - Jul 17, 13:40 UTCJul 17, 14:10 UTC30m
2026-07-17 UPS173 - Jul 17, 10:20 UTCJul 17, 10:40 UTC20m
2026-07-17 UPS174 - Jul 17, 03:59 UTCJul 17, 04:25 UTC25m
2026-07-16 UPS196 - Jul 16, 22:25 UTCJul 16, 23:05 UTC40m
2026-07-16 UPS196 - Jul 16, 20:15 UTCJul 16, 20:25 UTC10m
2026-07-16 UPS166 - Jul 16, 17:40 UTCJul 16, 17:54 UTC15m
2026-07-16 UPS166 - Jul 16, 14:20 UTCJul 16, 14:45 UTC25m
2026-07-16 UPS166 - Jul 16, 08:40 UTCJul 16, 11:45 UTC3h 5m
2026-07-16 UPS167 - Jul 16, 05:30 UTCJul 16, 06:05 UTC35m
2026-07-16 UPS167 - Jul 16, 02:20 UTCJul 16, 02:40 UTC20m
2026-07-16 UPS167 - Jul 16, 00:10 UTCJul 16, 00:40 UTC30m
2026-07-15 UPS167 - Jul 15, 21:25 UTCJul 15, 21:35 UTC10m
2026-07-15 UPS137 - Jul 15, 16:05 UTCJul 15, 16:35 UTC30m
2026-07-15 UPS136 SYD → CRK Jul 15, 06:40 UTCJul 15, 14:25 UTC7h 45m
2026-07-14 UPS138 - Jul 14, 20:10 UTCJul 15, 04:55 UTC8h 44m
2026-07-14 UPS166 - Jul 14, 17:25 UTCJul 14, 17:45 UTC20m
2026-07-14 UPS166 - Jul 14, 14:00 UTCJul 14, 14:25 UTC25m
2026-07-14 UPS166 - Jul 14, 08:40 UTCJul 14, 11:50 UTC3h 10m
2026-07-14 UPS167 - Jul 14, 03:45 UTCJul 14, 04:00 UTC15m
2026-07-14 UPS167 - Jul 14, 00:40 UTCJul 14, 01:05 UTC25m
2026-07-13 UPS167 - Jul 13, 22:25 UTCJul 13, 22:55 UTC30m
2026-07-13 UPS126 - Jul 13, 13:40 UTCJul 13, 14:35 UTC55m

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 N345UP page for operator, model, and routing details .

Mode-S A3D1B1 frequently asked

What is Mode-S code A3D1B1?
A3D1B1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N345UP.
Where is Mode-S A3D1B1 registered?
Mode-S code A3D1B1 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 A3D1B1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 06:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3D1B1, octal 50750661, decimal 10,736,049.
What flights does A3D1B1 operate?
Mode-S A3D1B1 has broadcast 20 distinct callsigns, including UPS167, UPS166, UPS137, UPS104, UPS127.