Apparatus

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sensors Mode-S transponder

A3EA54

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N351UP · BOEING 767-300 · operated by C C & E I LLC

Hex
A3EA54
Octal
50765124
Decimal
10,742,356
Country
US
Tail
N351UP
Type
B763
No current signal · last broadcast 1h ago
Flights observed
350
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A3EA54.

Country allocation

The ICAO 24-bit address A3EA54 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
UPS237 United Parcel Service 30 2026-07-07
UPS232 - 30 2026-07-07
UPS208 - 16 2026-07-13
UPS105 United Parcel Service 14 2026-07-04
UPS219 - 13 2026-06-29
UPS207 United Parcel Service 11 2026-04-22
UPS104 - 10 2026-07-14
UPS5772 United Parcel Service 6 2026-06-04
UPS272 - 5 2026-07-09
UPS806 United Parcel Service 4 2026-05-21
UPS771 United Parcel Service 4 2026-06-05
UPS5775 United Parcel Service 4 2026-06-09
UPS273 - 4 2026-07-09
UPS2462 United Parcel Service 4 2026-05-15
UPS243 - 4 2026-07-10
UPS242 - 4 2026-07-10
UPS238 - 4 2026-07-01
UPS2029 United Parcel Service 4 2026-06-02
UPS1066 United Parcel Service 4 2026-06-02
UPS990 United Parcel Service 3 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UPS104 - Jul 14, 08:45 UTCJul 14, 15:00 UTC6h 15m
2026-07-14 UPS617 - Jul 14, 02:05 UTCJul 14, 03:00 UTC55m
2026-07-14 UPS617 RFD → SDF Jul 14, 02:08 UTCJul 14, 03:00 UTC52m
2026-07-13 UPS9788 - Jul 13, 15:20 UTCJul 13, 16:05 UTC45m
2026-07-13 UPS208 - Jul 13, 11:45 UTCJul 13, 13:15 UTC1h 30m
2026-07-13 UPS208 CGN → EWR Jul 13, 00:01 UTCJul 13, 07:35 UTC7h 35m
2026-07-12 UPS269 - Jul 12, 10:20 UTCJul 12, 13:01 UTC2h 40m
2026-07-11 UPS268 - Jul 11, 05:10 UTCJul 11, 07:35 UTC2h 25m
2026-07-10 UPS243 BCN → CGN Jul 10, 21:05 UTCJul 10, 22:50 UTC1h 45m
2026-07-10 UPS243 VLC → BCN Jul 10, 19:05 UTCJul 10, 19:45 UTC40m
2026-07-10 UPS242 BCN → VLC Jul 10, 04:35 UTCJul 10, 05:10 UTC35m
2026-07-10 UPS242 CGN → BCN Jul 10, 01:50 UTCJul 10, 03:25 UTC1h 35m
2026-07-09 UPS273 - Jul 9, 19:20 UTCJul 9, 20:40 UTC1h 20m
2026-07-09 UPS272 CGN → WAW Jul 9, 02:25 UTCJul 9, 03:40 UTC1h 15m
2026-07-08 UPS243 BCN → CGN Jul 8, 21:15 UTCJul 8, 23:05 UTC1h 50m
2026-07-08 UPS243 VLC → BCN Jul 8, 19:10 UTCJul 8, 19:55 UTC45m
2026-07-08 UPS242 BCN → VLC Jul 8, 04:55 UTCJul 8, 05:30 UTC35m
2026-07-08 UPS242 CGN → BCN Jul 8, 02:00 UTCJul 8, 03:35 UTC1h 35m
2026-07-07 UPS237 PHL → EMA Jul 7, 21:05 UTCJul 7, 22:05 UTC1h 0m
2026-07-07 UPS237 PHL → EMA Jul 7, 12:45 UTCJul 7, 14:30 UTC1h 45m
2026-07-07 UPS237 PHL → EMA Jul 7, 12:50 UTCJul 7, 18:56 UTC6h 6m
2026-07-07 UPS232 EMA → PHL Jul 7, 03:25 UTCJul 7, 11:00 UTC7h 35m
2026-07-07 UPS232 CGN → EMA Jul 7, 00:35 UTCJul 7, 01:35 UTC1h 0m
2026-07-06 UPS237 PHL → EMA Jul 6, 21:05 UTCJul 6, 22:05 UTC1h 0m
2026-07-05 UPS237 PHL → EMA Jul 5, 14:10 UTCJul 5, 21:15 UTC7h 5m
2026-07-04 UPS327 - Jul 4, 15:35 UTCJul 4, 19:00 UTC3h 25m
2026-07-04 UPS327 SJU → SDF Jul 4, 15:32 UTCJul 4, 19:23 UTC3h 51m
2026-07-04 UPS340 - Jul 4, 13:05 UTCJul 4, 13:25 UTC20m
2026-07-04 UPS340 - Jul 4, 09:50 UTCJul 4, 11:00 UTC1h 10m
2026-07-04 UPS340 SDF → SJU Jul 4, 09:53 UTCJul 4, 13:22 UTC3h 29m
2026-07-04 UPS105 KIX → ANC Jul 4, 01:47 UTCJul 4, 07:53 UTC6h 6m
2026-07-04 UPS105 KIX → ANC Jul 4, 01:45 UTCJul 4, 08:00 UTC6h 15m
2026-07-03 UPS105 KIX → ANC Jul 3, 17:15 UTCJul 3, 18:20 UTC1h 5m
2026-07-03 UPS105 KIX → ANC Jul 3, 17:17 UTCJul 4, 00:20 UTC7h 3m
2026-07-03 UPS104 - Jul 3, 05:30 UTCJul 3, 15:40 UTC10h 10m
2026-07-03 UPS104 KIX → KIX Jul 3, 03:50 UTCJul 3, 03:55 UTC5m
2026-07-02 UPS104 ANC → KIX Jul 2, 19:40 UTCJul 3, 03:55 UTC8h 15m
2026-07-02 UPS104 - Jul 2, 08:50 UTCJul 2, 14:55 UTC6h 5m
2026-07-01 UPS238 - Jul 1, 20:10 UTCJul 1, 21:00 UTC50m
2026-07-01 UPS238 STN → SDF Jul 1, 20:04 UTCJul 2, 04:30 UTC8h 26m
2026-07-01 UPS238 STN → SDF Jul 1, 20:04 UTCJul 2, 04:37 UTC8h 33m
2026-07-01 UPS236 CGN → STN Jul 1, 01:45 UTCJul 1, 02:30 UTC45m
2026-06-30 UPS237 PHL → EMA Jun 30, 21:00 UTCJun 30, 22:00 UTC1h 0m
2026-06-30 UPS237 PHL → EMA Jun 30, 12:30 UTCJun 30, 14:30 UTC2h 0m
2026-06-30 UPS237 PHL → EMA Jun 30, 12:37 UTCJun 30, 18:47 UTC6h 10m
2026-06-30 UPS232 - Jun 30, 03:00 UTCJun 30, 04:05 UTC1h 5m
2026-06-30 UPS232 EMA → PHL Jun 30, 02:55 UTCJun 30, 10:19 UTC7h 24m
2026-06-30 UPS232 EMA → PHL Jun 30, 02:55 UTCJun 30, 10:19 UTC7h 24m
2026-06-30 UPS232 CGN → EMA Jun 30, 00:30 UTCJun 30, 01:30 UTC1h 1m
2026-06-29 UPS219 CDG → CGN Jun 29, 20:35 UTCJun 29, 21:24 UTC50m

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 N351UP page for operator, model, and routing details .

Mode-S A3EA54 frequently asked

What is Mode-S code A3EA54?
A3EA54 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N351UP.
Where is Mode-S A3EA54 registered?
Mode-S code A3EA54 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 A3EA54 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3EA54, octal 50765124, decimal 10,742,356.
What flights does A3EA54 operate?
Mode-S A3EA54 has broadcast 20 distinct callsigns, including UPS237, UPS232, UPS208, UPS105, UPS219.