Apparatus

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sensors Mode-S transponder

A53781

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N435UP · BOEING 757-200 · operated by UNITED PARCEL SERVICE CO

Hex
A53781
Octal
51233601
Decimal
10,827,649
Country
US
Tail
N435UP
Type
B752
No current signal · last broadcast Jul 26, 00:30 UTC
Flights observed
261
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 00:30 UTC

Last known position

Most recent position reported by Mode-S A53781.

Country allocation

The ICAO 24-bit address A53781 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
UPS1468 - 8 2026-06-26
UPS1198 - 7 2026-07-07
UPS896 - 6 2026-07-17
UPS711 United Parcel Service 6 2026-06-02
UPS1467 - 6 2026-06-30
UPS1291 - 5 2026-07-08
UPS1234 United Parcel Service 5 2026-05-29
UPS1124 - 5 2026-06-14
UPS780 United Parcel Service 4 2026-06-04
UPS5833 - 4 2026-07-23
UPS5365 United Parcel Service 4 2026-05-20
UPS1364 United Parcel Service 4 2026-05-20
UPS1352 United Parcel Service 4 2026-04-17
UPS1348 United Parcel Service 4 2026-05-22
UPS1233 United Parcel Service 4 2026-05-30
UPS1131 United Parcel Service 4 2026-06-11
UPS1052 United Parcel Service 4 2026-04-23
UPS9844 United Parcel Service 3 2026-06-12
UPS9762 - 3 2026-06-30
UPS938 - 3 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UPS5796 SDF → ELP Jul 25, 22:10 UTCJul 26, 00:30 UTC2h 20m
2026-07-25 UPS5796 SDF → ELP Jul 25, 22:07 UTCJul 26, 00:40 UTC2h 33m
2026-07-25 UPS895 RNO → SDF Jul 25, 02:30 UTCJul 25, 05:35 UTC3h 5m
2026-07-25 UPS9308 SDF → DTW Jul 25, 00:00 UTCJul 25, 00:50 UTC50m
2026-07-23 UPS5833 - Jul 23, 13:10 UTCJul 23, 14:40 UTC1h 30m
2026-07-23 UPS834 ONT → SLC Jul 23, 10:05 UTCJul 23, 11:30 UTC1h 25m
2026-07-23 UPS785 AUS → SDF Jul 23, 02:40 UTCJul 23, 03:50 UTC1h 10m
2026-07-22 UPS2796 SDF → ELP Jul 22, 21:10 UTCJul 22, 23:35 UTC2h 25m
2026-07-22 UPS2865 - Jul 22, 13:40 UTCJul 22, 16:45 UTC3h 5m
2026-07-22 UPS9866 MHR → PHX Jul 22, 11:15 UTCJul 22, 12:20 UTC1h 5m
2026-07-22 UPS9302 MIA → SDF Jul 22, 03:35 UTCJul 22, 04:40 UTC1h 5m
2026-07-17 UPS896 - Jul 17, 11:04 UTCJul 17, 14:39 UTC3h 35m
2026-07-17 UPS1299 - Jul 17, 01:25 UTCJul 17, 03:20 UTC1h 55m
2026-07-16 UPS1128 - Jul 16, 08:15 UTCJul 16, 09:55 UTC1h 40m
2026-07-16 UPS301 MTY → SDF Jul 16, 01:30 UTCJul 16, 04:00 UTC2h 30m
2026-07-15 UPS300 - Jul 15, 09:30 UTCJul 15, 12:05 UTC2h 35m
2026-07-15 UPS613 - Jul 15, 03:40 UTCJul 15, 04:30 UTC50m
2026-07-15 UPS9775 - Jul 15, 00:35 UTCJul 15, 01:05 UTC30m
2026-07-14 UPS1476 - Jul 14, 08:25 UTCJul 14, 08:55 UTC30m
2026-07-14 UPS1476 RFD → LAN Jul 14, 08:20 UTCJul 14, 08:55 UTC35m
2026-07-14 UPS809 - Jul 14, 04:10 UTCJul 14, 05:55 UTC1h 45m
2026-07-14 UPS809 DEN → RFD Jul 14, 04:07 UTCJul 14, 05:56 UTC1h 49m
2026-07-12 UPS5804 - Jul 12, 19:30 UTCJul 12, 21:45 UTC2h 15m
2026-07-11 UPS1315 - Jul 11, 03:20 UTCJul 11, 04:30 UTC1h 10m
2026-07-11 UPS1315 SAV → ABY Jul 11, 02:00 UTCJul 11, 02:40 UTC40m
2026-07-10 UPS1314 - Jul 10, 08:50 UTCJul 10, 09:55 UTC1h 5m
2026-07-10 UPS1314 SDF → SAV Jul 10, 08:43 UTCJul 10, 09:53 UTC1h 10m
2026-07-10 UPS937 - Jul 10, 01:30 UTCJul 10, 05:15 UTC3h 45m
2026-07-09 UPS938 - Jul 9, 07:45 UTCJul 9, 11:30 UTC3h 45m
2026-07-09 UPS321 - Jul 9, 02:00 UTCJul 9, 05:05 UTC3h 5m
2026-07-09 UPS321 NLU → SDF Jul 9, 01:49 UTCJul 9, 05:06 UTC3h 17m
2026-07-08 UPS320 - Jul 8, 09:30 UTCJul 8, 12:40 UTC3h 10m
2026-07-08 UPS320 SDF → NLU Jul 8, 09:37 UTCJul 8, 12:39 UTC3h 2m
2026-07-08 UPS1291 - Jul 8, 01:15 UTCJul 8, 02:10 UTC55m
2026-07-07 UPS1198 - Jul 7, 07:20 UTCJul 7, 08:35 UTC1h 15m
2026-07-07 UPS1153 - Jul 7, 02:10 UTCJul 7, 02:50 UTC40m
2026-07-06 UPS9793 - Jul 6, 23:25 UTCJul 7, 00:30 UTC1h 5m
2026-07-03 UPS1198 PHL → CAE Jul 3, 07:16 UTCJul 3, 08:22 UTC1h 6m
2026-07-03 UPS1198 - Jul 3, 07:10 UTCJul 3, 08:25 UTC1h 15m
2026-07-03 UPS1445 - Jul 3, 01:45 UTCJul 3, 02:40 UTC55m
2026-07-02 UPS1446 - Jul 2, 08:10 UTCJul 2, 09:05 UTC55m
2026-07-02 UPS1446 RFD → CLE Jul 2, 08:13 UTCJul 2, 09:08 UTC55m
2026-07-02 UPS1085 - Jul 2, 02:25 UTCJul 2, 04:10 UTC1h 45m
2026-07-01 UPS5086 DFW → EWR Jul 1, 19:50 UTCJul 1, 22:45 UTC2h 55m
2026-07-01 UPS5086 DFW → EWR Jul 1, 19:51 UTCJul 1, 22:52 UTC3h 1m
2026-07-01 UPS5833 MHR → DFW Jul 1, 13:55 UTCJul 1, 16:45 UTC2h 50m
2026-07-01 UPS5833 MHR → DFW Jul 1, 13:52 UTCJul 1, 16:40 UTC2h 48m
2026-07-01 UPS5833 - Jul 1, 11:55 UTCJul 1, 13:00 UTC1h 5m
2026-07-01 UPS834 - Jul 1, 09:30 UTCJul 1, 10:05 UTC35m
2026-07-01 UPS834 ONT → BOI Jul 1, 09:29 UTCJul 1, 10:56 UTC1h 27m

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 N435UP page for operator, model, and routing details .

Mode-S A53781 frequently asked

What is Mode-S code A53781?
A53781 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N435UP.
Where is Mode-S A53781 registered?
Mode-S code A53781 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 A53781 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 00:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A53781, octal 51233601, decimal 10,827,649.
What flights does A53781 operate?
Mode-S A53781 has broadcast 20 distinct callsigns, including UPS1468, UPS1198, UPS896, UPS711, UPS1467.