Apparatus

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sensors Mode-S transponder

A37EFC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N324UP · BOEING 767-300 · operated by UNITED PARCEL SERVICE CO

Hex
A37EFC
Octal
50677374
Decimal
10,714,876
Country
US
Tail
N324UP
Type
B763
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
365
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A37EFC.

Country allocation

The ICAO 24-bit address A37EFC 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
UPS219 United Parcel Service 20 2026-07-22
UPS208 United Parcel Service 12 2026-07-21
UPS238 United Parcel Service 8 2026-07-23
UPS5978 United Parcel Service 6 2026-07-24
UPS237 United Parcel Service 6 2026-07-20
UPS232 - 6 2026-07-16
UPS7893 United Parcel Service 5 2026-04-15
UPS5793 United Parcel Service 5 2026-06-14
UPS5074 United Parcel Service 5 2026-04-15
UPS236 United Parcel Service 5 2026-07-23
UPS975 - 4 2026-07-07
UPS918 - 4 2026-07-03
UPS774 - 4 2026-07-08
UPS5981 - 4 2026-07-07
UPS5196 - 4 2026-07-09
UPS400 United Parcel Service 4 2026-05-09
UPS390 United Parcel Service 4 2026-06-10
UPS2801 - 4 2026-07-02
UPS2773 - 4 2026-07-08
UPS2756 - 4 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UPS494 SDF → YMX Jul 26, 21:45 UTCJul 26, 23:00 UTC1h 15m
2026-07-26 UPS973 PDX → SDF Jul 26, 13:05 UTCJul 26, 16:10 UTC3h 5m
2026-07-26 UPS973 PDX → SDF Jul 26, 11:10 UTCJul 26, 12:10 UTC1h 0m
2026-07-26 UPS2978 DFW → GEG Jul 26, 01:15 UTCJul 26, 01:45 UTC30m
2026-07-26 UPS2978 DFW → GEG Jul 26, 01:09 UTCJul 26, 01:40 UTC31m
2026-07-25 UPS2978 DFW → GEG Jul 25, 19:15 UTCJul 25, 23:40 UTC4h 25m
2026-07-25 UPS5973 BFI → SDF Jul 25, 14:00 UTCJul 25, 17:25 UTC3h 25m
2026-07-25 UPS5973 BFI → SDF Jul 25, 14:00 UTCJul 25, 17:28 UTC3h 28m
2026-07-25 UPS5973 PDX → BFI Jul 25, 12:20 UTCJul 25, 12:50 UTC30m
2026-07-24 UPS5978 SDF → PDX Jul 24, 20:10 UTCJul 25, 00:30 UTC4h 20m
2026-07-24 UPS5125 JFK → SDF Jul 24, 13:40 UTCJul 24, 15:25 UTC1h 45m
2026-07-24 UPS1114 SDF → JFK Jul 24, 10:30 UTCJul 24, 12:05 UTC1h 35m
2026-07-23 UPS238 STN → SDF Jul 23, 20:10 UTCJul 24, 04:30 UTC8h 20m
2026-07-23 UPS236 CGN → STN Jul 23, 01:35 UTCJul 23, 02:25 UTC50m
2026-07-22 UPS219 PHL → CDG Jul 22, 20:40 UTCJul 22, 21:20 UTC40m
2026-07-22 UPS219 PHL → CDG Jul 22, 12:05 UTCJul 22, 18:55 UTC6h 50m
2026-07-22 UPS959 MHR → SDF Jul 22, 02:50 UTCJul 22, 05:25 UTC2h 35m
2026-07-21 UPS2960 DSM → MHR Jul 21, 21:50 UTCJul 22, 01:45 UTC3h 55m
2026-07-21 UPS208 PHL → SDF Jul 21, 15:35 UTCJul 21, 17:10 UTC1h 35m
2026-07-21 UPS208 PHL → SDF Jul 21, 12:15 UTCJul 21, 12:45 UTC30m
2026-07-21 UPS208 PHL → SDF Jul 21, 01:55 UTCJul 21, 09:45 UTC7h 50m
2026-07-20 UPS237 PHL → EMA Jul 20, 21:55 UTCJul 20, 23:00 UTC1h 5m
2026-07-19 UPS237 PHL → EMA Jul 19, 14:40 UTCJul 19, 21:05 UTC6h 25m
2026-07-18 UPS219 - Jul 18, 09:25 UTCJul 18, 10:45 UTC1h 20m
2026-07-17 UPS238 STN → SDF Jul 17, 22:49 UTCJul 18, 07:15 UTC8h 26m
2026-07-17 UPS236 CGN → STN Jul 17, 01:55 UTCJul 17, 02:50 UTC55m
2026-07-16 UPS237 EMA → CGN Jul 16, 21:00 UTCJul 16, 22:00 UTC1h 0m
2026-07-16 UPS237 PHL → EMA Jul 16, 12:40 UTCJul 16, 19:20 UTC6h 40m
2026-07-16 UPS232 EMA → PHL Jul 16, 03:15 UTCJul 16, 10:29 UTC7h 15m
2026-07-16 UPS232 CGN → EMA Jul 16, 00:15 UTCJul 16, 01:15 UTC1h 0m
2026-07-15 UPS219 - Jul 15, 21:05 UTCJul 15, 21:50 UTC45m
2026-07-15 UPS219 - Jul 15, 12:05 UTCJul 15, 19:00 UTC6h 55m
2026-07-15 UPS219 - Jul 15, 08:45 UTCJul 15, 10:05 UTC1h 20m
2026-07-15 UPS905 - Jul 15, 02:30 UTCJul 15, 06:20 UTC3h 50m
2026-07-14 UPS2908 - Jul 14, 20:40 UTCJul 15, 00:20 UTC3h 39m
2026-07-14 UPS2908 SDF → LGB Jul 14, 20:38 UTCJul 15, 00:13 UTC3h 35m
2026-07-14 UPS208 PHL → SDF Jul 14, 14:50 UTCJul 14, 16:05 UTC1h 15m
2026-07-14 UPS208 PHL → SDF Jul 14, 14:52 UTCJul 14, 16:07 UTC1h 15m
2026-07-14 UPS208 - Jul 14, 12:10 UTCJul 14, 12:35 UTC25m
2026-07-14 UPS208 EWR → PHL Jul 14, 12:07 UTCJul 14, 12:34 UTC27m
2026-07-14 UPS208 - Jul 14, 01:15 UTCJul 14, 03:00 UTC1h 45m
2026-07-14 UPS208 CGN → EWR Jul 14, 01:14 UTCJul 14, 08:44 UTC7h 30m
2026-07-12 UPS233 - Jul 12, 19:35 UTCJul 13, 03:45 UTC8h 10m
2026-07-12 UPS5567 - Jul 12, 11:45 UTCJul 12, 13:01 UTC1h 15m
2026-07-11 UPS5568 - Jul 11, 21:05 UTCJul 11, 22:35 UTC1h 30m
2026-07-11 UPS5971 - Jul 11, 13:35 UTCJul 11, 17:10 UTC3h 35m
2026-07-10 UPS5972 - Jul 10, 19:45 UTCJul 10, 21:00 UTC1h 15m
2026-07-10 UPS5972 ONT → PDX Jul 10, 19:51 UTCJul 10, 21:27 UTC1h 36m
2026-07-09 UPS5196 PHL → ONT Jul 9, 14:55 UTCJul 9, 19:55 UTC5h 0m
2026-07-09 UPS5196 PHL → ONT Jul 9, 14:50 UTCJul 9, 19:56 UTC5h 6m

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 N324UP page for operator, model, and routing details .

Mode-S A37EFC frequently asked

What is Mode-S code A37EFC?
A37EFC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N324UP.
Where is Mode-S A37EFC registered?
Mode-S code A37EFC 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 A37EFC broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A37EFC, octal 50677374, decimal 10,714,876.
What flights does A37EFC operate?
Mode-S A37EFC has broadcast 20 distinct callsigns, including UPS219, UPS208, UPS238, UPS5978, UPS237.