Apparatus

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sensors Mode-S transponder

A51002

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N425UP · BOEING 757-200 · operated by UNITED PARCEL SERVICE CO

Hex
A51002
Octal
51210002
Decimal
10,817,538
Country
US
Tail
N425UP
Type
B752
No current signal · last broadcast Jul 24, 13:00 UTC
Flights observed
268
Distinct callsigns
20
Country
US
Last broadcast
Jul 24, 13:00 UTC

Last known position

Most recent position reported by Mode-S A51002.

Country allocation

The ICAO 24-bit address A51002 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
UPS992 - 6 2026-07-09
UPS2991 - 6 2026-07-09
UPS2980 - 6 2026-07-03
UPS1348 - 6 2026-07-16
UPS1284 United Parcel Service 6 2026-07-21
UPS572 - 5 2026-07-14
UPS5273 - 5 2026-07-21
UPS1124 United Parcel Service 5 2026-06-11
UPS991 - 4 2026-07-03
UPS987 - 4 2026-06-23
UPS757 United Parcel Service 4 2026-05-14
UPS753 United Parcel Service 4 2026-06-02
UPS634 United Parcel Service 4 2026-06-02
UPS633 United Parcel Service 4 2026-06-03
UPS610 United Parcel Service 4 2026-05-27
UPS609 United Parcel Service 4 2026-05-28
UPS598 - 4 2026-07-03
UPS5794 United Parcel Service 4 2026-05-31
UPS1347 - 4 2026-06-16
UPS1233 - 4 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 UPS9752 SAT → PHX Jul 24, 11:40 UTCJul 24, 12:55 UTC1h 15m
2026-07-24 UPS1052 MHT → BGR Jul 24, 10:15 UTCJul 24, 10:50 UTC35m
2026-07-24 UPS1052 MHT → BGR Jul 24, 06:25 UTCJul 24, 08:10 UTC1h 45m
2026-07-24 UPS1477 LAN → SDF Jul 24, 01:55 UTCJul 24, 02:45 UTC50m
2026-07-23 UPS5496 SDF → LAN Jul 23, 21:25 UTCJul 23, 22:05 UTC40m
2026-07-23 UPS5365 - Jul 23, 13:25 UTCJul 23, 14:40 UTC1h 15m
2026-07-23 UPS1364 SDF → PNS Jul 23, 09:15 UTCJul 23, 10:20 UTC1h 5m
2026-07-23 UPS837 BOI → SDF Jul 23, 01:00 UTCJul 23, 04:05 UTC3h 5m
2026-07-22 UPS2838 SDF → BOI Jul 22, 19:45 UTCJul 22, 23:10 UTC3h 25m
2026-07-22 UPS5027 BOS → SDF Jul 22, 11:40 UTCJul 22, 13:30 UTC1h 50m
2026-07-21 UPS5273 - Jul 21, 12:35 UTCJul 21, 14:05 UTC1h 30m
2026-07-21 UPS1284 PHL → CLT Jul 21, 07:45 UTCJul 21, 08:50 UTC1h 5m
2026-07-21 UPS1283 - Jul 21, 01:50 UTCJul 21, 03:10 UTC1h 20m
2026-07-17 UPS1284 - Jul 17, 07:25 UTCJul 17, 08:30 UTC1h 5m
2026-07-17 UPS1351 TPA → PHL Jul 17, 01:49 UTCJul 17, 03:50 UTC2h 0m
2026-07-16 UPS9748 RSW → TPA Jul 16, 11:15 UTCJul 16, 11:45 UTC30m
2026-07-16 UPS1348 - Jul 16, 08:40 UTCJul 16, 10:25 UTC1h 45m
2026-07-16 UPS671 IAB → SDF Jul 16, 02:15 UTCJul 16, 03:45 UTC1h 30m
2026-07-15 UPS672 - Jul 15, 09:20 UTCJul 15, 10:40 UTC1h 20m
2026-07-15 UPS525 - Jul 15, 03:15 UTCJul 15, 04:20 UTC1h 5m
2026-07-14 UPS572 - Jul 14, 08:40 UTCJul 14, 09:00 UTC20m
2026-07-14 UPS572 RFD → CID Jul 14, 08:37 UTCJul 14, 09:02 UTC25m
2026-07-14 UPS909 - Jul 14, 02:50 UTCJul 14, 06:05 UTC3h 15m
2026-07-14 UPS909 LGB → RFD Jul 14, 02:49 UTCJul 14, 06:04 UTC3h 15m
2026-07-13 UPS7806 BOI → LGB Jul 13, 22:30 UTCJul 14, 00:20 UTC1h 50m
2026-07-13 UPS7806 BOI → LGB Jul 13, 22:23 UTCJul 14, 00:23 UTC2h 0m
2026-07-10 UPS834 - Jul 10, 09:25 UTCJul 10, 10:45 UTC1h 20m
2026-07-10 UPS834 ONT → BOI Jul 10, 09:22 UTCJul 10, 10:50 UTC1h 28m
2026-07-09 UPS9778 PDX → ONT Jul 9, 23:55 UTCJul 10, 02:05 UTC2h 10m
2026-07-09 UPS2972 - Jul 9, 19:50 UTCJul 9, 21:40 UTC1h 50m
2026-07-09 UPS2991 GEG → ONT Jul 9, 12:20 UTCJul 9, 14:20 UTC2h 0m
2026-07-09 UPS2991 GEG → ONT Jul 9, 12:26 UTCJul 9, 14:18 UTC1h 52m
2026-07-09 UPS992 ONT → GEG Jul 9, 09:20 UTCJul 9, 11:20 UTC2h 0m
2026-07-09 UPS992 ONT → GEG Jul 9, 09:18 UTCJul 9, 11:20 UTC2h 2m
2026-07-08 UPS9778 - Jul 8, 23:55 UTCJul 9, 01:45 UTC1h 50m
2026-07-08 UPS9778 PDX → ONT Jul 8, 23:54 UTCJul 9, 01:46 UTC1h 52m
2026-07-08 UPS2972 - Jul 8, 19:45 UTCJul 8, 21:35 UTC1h 50m
2026-07-08 UPS2991 GEG → ONT Jul 8, 12:20 UTCJul 8, 14:25 UTC2h 5m
2026-07-08 UPS2991 GEG → ONT Jul 8, 12:22 UTCJul 8, 14:23 UTC2h 1m
2026-07-08 UPS992 - Jul 8, 09:15 UTCJul 8, 11:15 UTC2h 0m
2026-07-08 UPS992 ONT → GEG Jul 8, 09:17 UTCJul 8, 11:14 UTC1h 57m
2026-07-08 UPS805 DEN → ONT Jul 8, 03:50 UTCJul 8, 05:35 UTC1h 45m
2026-07-07 UPS5806 - Jul 7, 20:05 UTCJul 7, 21:50 UTC1h 45m
2026-07-07 UPS2991 GEG → ONT Jul 7, 12:05 UTCJul 7, 14:15 UTC2h 10m
2026-07-07 UPS2991 GEG → ONT Jul 7, 12:09 UTCJul 7, 14:13 UTC2h 4m
2026-07-07 UPS992 ONT → GEG Jul 7, 09:05 UTCJul 7, 11:00 UTC1h 55m
2026-07-07 UPS992 ONT → GEG Jul 7, 09:09 UTCJul 7, 11:06 UTC1h 57m
2026-07-07 UPS955 MHR → ONT Jul 7, 03:45 UTCJul 7, 04:45 UTC1h 0m
2026-07-07 UPS955 MHR → ONT Jul 7, 03:47 UTCJul 7, 04:46 UTC59m
2026-07-03 UPS9821 - Jul 3, 22:50 UTCJul 4, 00:35 UTC1h 45m

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 N425UP page for operator, model, and routing details .

Mode-S A51002 frequently asked

What is Mode-S code A51002?
A51002 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N425UP.
Where is Mode-S A51002 registered?
Mode-S code A51002 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 A51002 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 13:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A51002, octal 51210002, decimal 10,817,538.
What flights does A51002 operate?
Mode-S A51002 has broadcast 20 distinct callsigns, including UPS992, UPS2991, UPS2980, UPS1348, UPS1284.