Apparatus

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sensors Mode-S transponder

A3B557

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N338UP · BOEING 767-300 · operated by UNITED PARCEL SERVICE CO

Hex
A3B557
Octal
50732527
Decimal
10,728,791
Country
US
Tail
N338UP
Type
B763
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
417
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A3B557.

Country allocation

The ICAO 24-bit address A3B557 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
UPS371 United Parcel Service 8 2026-05-19
UPS2462 - 8 2026-07-17
UPS219 - 8 2026-07-08
UPS2463 United Parcel Service 6 2026-07-17
UPS232 - 6 2026-07-09
UPS920 United Parcel Service 5 2026-06-09
UPS617 - 5 2026-06-17
UPS5929 United Parcel Service 5 2026-07-19
UPS237 - 5 2026-07-09
UPS1332 United Parcel Service 5 2026-05-19
UPS9725 United Parcel Service 4 2026-06-16
UPS922 United Parcel Service 4 2026-05-22
UPS916 - 4 2026-06-25
UPS915 United Parcel Service 4 2026-06-13
UPS858 - 4 2026-07-15
UPS801 United Parcel Service 4 2026-05-16
UPS5808 United Parcel Service 4 2026-05-15
UPS2986 United Parcel Service 4 2026-06-18
UPS2925 United Parcel Service 4 2026-06-17
UPS238 - 4 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UPS5744 RFD → DFW Jul 26, 20:20 UTCJul 26, 21:45 UTC1h 25m
2026-07-25 UPS2618 SDF → RFD Jul 25, 22:30 UTCJul 25, 23:30 UTC1h 0m
2026-07-25 UPS2618 SDF → RFD Jul 25, 22:25 UTCJul 25, 23:34 UTC1h 9m
2026-07-25 UPS5993 GEG → SDF Jul 25, 12:15 UTCJul 25, 15:20 UTC3h 5m
2026-07-25 UPS5993 GEG → SDF Jul 25, 12:22 UTCJul 25, 15:17 UTC2h 55m
2026-07-24 UPS5994 SDF → GEG Jul 24, 21:30 UTCJul 25, 01:20 UTC3h 50m
2026-07-24 UPS5971 PDX → SDF Jul 24, 13:40 UTCJul 24, 17:15 UTC3h 35m
2026-07-24 UPS972 ONT → PDX Jul 24, 10:05 UTCJul 24, 11:45 UTC1h 40m
2026-07-23 UPS5910 SDF → ONT Jul 23, 18:30 UTCJul 23, 21:55 UTC3h 25m
2026-07-23 UPS2335 - Jul 23, 12:05 UTCJul 23, 14:00 UTC1h 55m
2026-07-23 UPS1334 PHL → RSW Jul 23, 08:30 UTCJul 23, 10:15 UTC1h 45m
2026-07-23 UPS905 LGB → SDF Jul 23, 02:30 UTCJul 23, 06:00 UTC3h 30m
2026-07-22 UPS2908 SDF → ONT Jul 22, 19:35 UTCJul 22, 23:20 UTC3h 45m
2026-07-22 UPS2949 OAK → SDF Jul 22, 12:00 UTCJul 22, 15:50 UTC3h 50m
2026-07-21 UPS2946 - Jul 21, 22:50 UTCJul 22, 02:55 UTC4h 5m
2026-07-21 UPS5905 - Jul 21, 11:10 UTCJul 21, 14:40 UTC3h 30m
2026-07-21 UPS805 DEN → ONT Jul 21, 03:45 UTCJul 21, 05:25 UTC1h 40m
2026-07-19 UPS808 DEN → OAK Jul 19, 21:05 UTCJul 19, 23:20 UTC2h 15m
2026-07-19 UPS5929 SAN → SDF Jul 19, 13:40 UTCJul 19, 17:25 UTC3h 45m
2026-07-18 UPS5636 SDF → SAN Jul 18, 22:05 UTCJul 19, 01:45 UTC3h 40m
2026-07-18 UPS5917 ONT → SDF Jul 18, 12:45 UTCJul 18, 15:50 UTC3h 5m
2026-07-18 UPS5917 ONT → SDF Jul 18, 10:50 UTCJul 18, 11:40 UTC50m
2026-07-17 UPS2463 KOA → OGG Jul 17, 22:35 UTCJul 17, 23:10 UTC35m
2026-07-17 UPS2463 KOA → OGG Jul 17, 17:09 UTCJul 17, 17:30 UTC20m
2026-07-17 UPS2463 KOA → OGG Jul 17, 15:20 UTCJul 17, 15:49 UTC30m
2026-07-17 UPS2462 - Jul 17, 09:25 UTCJul 17, 09:55 UTC30m
2026-07-17 UPS2462 - Jul 17, 06:50 UTCJul 17, 07:00 UTC10m
2026-07-17 UPS2462 - Jul 17, 01:55 UTCJul 17, 02:30 UTC35m
2026-07-16 UPS5910 - Jul 16, 18:50 UTCJul 16, 22:25 UTC3h 35m
2026-07-16 UPS2773 - Jul 16, 12:55 UTCJul 16, 14:40 UTC1h 45m
2026-07-16 UPS774 - Jul 16, 08:55 UTCJul 16, 10:40 UTC1h 45m
2026-07-16 UPS7831 - Jul 16, 06:25 UTCJul 16, 07:10 UTC45m
2026-07-16 UPS1191 - Jul 16, 02:15 UTCJul 16, 04:05 UTC1h 50m
2026-07-15 UPS2190 - Jul 15, 18:20 UTCJul 15, 23:05 UTC4h 45m
2026-07-15 UPS2859 - Jul 15, 13:35 UTCJul 15, 14:20 UTC45m
2026-07-15 UPS858 - Jul 15, 08:00 UTCJul 15, 10:55 UTC2h 55m
2026-07-15 UPS1111 JFK → SDF Jul 15, 03:10 UTCJul 15, 04:35 UTC1h 25m
2026-07-14 UPS2114 - Jul 14, 20:10 UTCJul 14, 22:00 UTC1h 50m
2026-07-14 UPS2114 SDF → JFK Jul 14, 20:09 UTCJul 14, 21:57 UTC1h 48m
2026-07-14 UPS2085 - Jul 14, 12:20 UTCJul 14, 13:40 UTC1h 20m
2026-07-14 UPS1096 - Jul 14, 07:20 UTCJul 14, 08:55 UTC1h 35m
2026-07-14 UPS1096 SDF → EWR Jul 14, 07:15 UTCJul 14, 08:59 UTC1h 44m
2026-07-14 UPS1381 - Jul 14, 04:30 UTCJul 14, 05:25 UTC55m
2026-07-14 UPS1381 MEM → SDF Jul 14, 04:08 UTCJul 14, 05:23 UTC1h 15m
2026-07-11 UPS5384 - Jul 11, 20:55 UTCJul 11, 22:10 UTC1h 15m
2026-07-11 UPS5017 BOS → SDF Jul 11, 14:20 UTCJul 11, 16:25 UTC2h 5m
2026-07-11 UPS1014 - Jul 11, 09:50 UTCJul 11, 11:30 UTC1h 40m
2026-07-11 UPS799 - Jul 11, 02:40 UTCJul 11, 05:31 UTC2h 50m
2026-07-10 UPS5796 - Jul 10, 21:25 UTCJul 10, 23:45 UTC2h 20m
2026-07-10 UPS208 - Jul 10, 17:25 UTCJul 10, 19:00 UTC1h 35m

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 N338UP page for operator, model, and routing details .

Mode-S A3B557 frequently asked

What is Mode-S code A3B557?
A3B557 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N338UP.
Where is Mode-S A3B557 registered?
Mode-S code A3B557 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 A3B557 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3B557, octal 50732527, decimal 10,728,791.
What flights does A3B557 operate?
Mode-S A3B557 has broadcast 20 distinct callsigns, including UPS371, UPS2462, UPS219, UPS2463, UPS232.