Apparatus

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sensors Mode-S transponder

A4EFF1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N417UP · BOEING 757-200 · operated by UNITED PARCEL SERVICE CO

Hex
A4EFF1
Octal
51167761
Decimal
10,809,329
Country
US
Tail
N417UP
Type
B752
No current signal · last broadcast 13h ago
Flights observed
114
Distinct callsigns
20
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S A4EFF1.

Country allocation

The ICAO 24-bit address A4EFF1 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
UPS871 United Parcel Service 5 2026-04-18
UPS1244 - 5 2026-07-02
UPS5062 - 4 2026-07-07
UPS1376 - 4 2026-06-30
UPS1375 - 4 2026-07-01
UPS9844 - 3 2026-07-03
UPS913 - 3 2026-06-30
UPS776 United Parcel Service 3 2026-04-30
UPS5793 United Parcel Service 3 2026-04-30
UPS1365 - 3 2026-07-03
UPS1299 - 3 2026-07-08
UPS1233 United Parcel Service 3 2026-04-21
UPS9724 United Parcel Service 2 2026-04-20
UPS938 United Parcel Service 2 2026-04-22
UPS937 United Parcel Service 2 2026-04-23
UPS896 - 2 2026-07-09
UPS895 - 2 2026-07-14
UPS872 United Parcel Service 2 2026-04-23
UPS796 United Parcel Service 2 2026-04-24
UPS795 United Parcel Service 2 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UPS895 - Jul 14, 03:15 UTCJul 14, 06:25 UTC3h 10m
2026-07-14 UPS895 RNO → SDF Jul 14, 02:37 UTCJul 14, 06:22 UTC3h 45m
2026-07-09 UPS896 - Jul 9, 08:15 UTCJul 9, 12:00 UTC3h 45m
2026-07-09 UPS896 SDF → RNO Jul 9, 08:09 UTCJul 9, 12:14 UTC4h 5m
2026-07-09 UPS1139 - Jul 9, 01:55 UTCJul 9, 03:20 UTC1h 25m
2026-07-09 UPS1139 SYR → SDF Jul 9, 01:58 UTCJul 9, 03:27 UTC1h 29m
2026-07-08 UPS2134 - Jul 8, 20:55 UTCJul 8, 22:10 UTC1h 15m
2026-07-08 UPS1299 - Jul 8, 01:35 UTCJul 8, 03:30 UTC1h 55m
2026-07-07 UPS5062 - Jul 7, 22:05 UTCJul 7, 22:30 UTC25m
2026-07-07 UPS5062 - Jul 7, 19:10 UTCJul 7, 20:50 UTC1h 40m
2026-07-07 UPS1315 - Jul 7, 02:25 UTCJul 7, 03:35 UTC1h 10m
2026-07-03 UPS1314 - Jul 3, 08:40 UTCJul 3, 09:50 UTC1h 10m
2026-07-03 UPS1365 ABY → SDF Jul 3, 03:20 UTCJul 3, 04:25 UTC1h 5m
2026-07-03 UPS1365 ABY → SDF Jul 3, 03:16 UTCJul 3, 04:26 UTC1h 10m
2026-07-03 UPS9844 - Jul 3, 01:00 UTCJul 3, 01:40 UTC40m
2026-07-02 UPS1244 - Jul 2, 07:25 UTCJul 2, 07:55 UTC30m
2026-07-02 UPS1244 GSO → CAE Jul 2, 07:27 UTCJul 2, 07:57 UTC30m
2026-07-02 UPS1244 - Jul 2, 05:50 UTCJul 2, 06:41 UTC51m
2026-07-02 UPS619 - Jul 2, 03:55 UTCJul 2, 04:40 UTC45m
2026-07-02 UPS619 PIA → SDF Jul 2, 03:51 UTCJul 2, 04:38 UTC47m
2026-07-01 UPS620 - Jul 1, 09:00 UTCJul 1, 09:50 UTC50m
2026-07-01 UPS620 SDF → PIA Jul 1, 08:54 UTCJul 1, 09:45 UTC51m
2026-07-01 UPS1375 - Jul 1, 01:50 UTCJul 1, 02:20 UTC30m
2026-07-01 UPS1375 TYS → SDF Jul 1, 01:46 UTCJul 1, 02:20 UTC34m
2026-06-30 UPS1376 - Jun 30, 09:35 UTCJun 30, 10:10 UTC35m
2026-06-30 UPS1376 SDF → TYS Jun 30, 09:29 UTCJun 30, 10:08 UTC39m
2026-06-30 UPS913 - Jun 30, 02:25 UTCJun 30, 05:45 UTC3h 20m
2026-06-30 UPS913 SNA → SDF Jun 30, 02:18 UTCJun 30, 05:50 UTC3h 32m
2026-06-29 UPS7839 ONT → FAT Jun 29, 23:44 UTCJun 29, 23:54 UTC10m
2026-06-25 UPS5961 MHR → ONT Jun 25, 13:09 UTCJun 25, 14:04 UTC55m
2026-06-25 UPS5961 MHR → ONT Jun 25, 13:10 UTCJun 25, 14:06 UTC56m
2026-06-25 UPS966 ONT → MHR Jun 25, 08:14 UTCJun 25, 09:10 UTC55m
2026-06-24 UPS9778 PDX → ONT Jun 24, 23:59 UTCJun 25, 01:54 UTC1h 55m
2026-06-24 UPS2972 ONT → PDX Jun 24, 19:29 UTCJun 24, 21:24 UTC1h 55m
2026-06-24 UPS2983 BFI → SDF Jun 24, 15:35 UTCJun 24, 17:45 UTC2h 10m
2026-06-24 UPS988 - Jun 24, 07:44 UTCJun 24, 11:39 UTC3h 55m
2026-06-24 UPS1327 - Jun 24, 01:19 UTCJun 24, 03:40 UTC2h 20m
2026-06-23 UPS7818 IAD → MCO Jun 23, 11:40 UTCJun 23, 13:24 UTC1h 45m
2026-06-23 UPS1218 - Jun 23, 08:25 UTCJun 23, 09:49 UTC1h 25m
2026-06-23 UPS9601 - Jun 23, 00:19 UTCJun 23, 01:00 UTC40m
2026-06-20 UPS1443 - Jun 20, 03:29 UTCJun 20, 04:09 UTC40m
2026-06-19 UPS1444 - Jun 19, 08:40 UTCJun 19, 09:14 UTC35m
2026-06-19 UPS705 - Jun 19, 03:09 UTCJun 19, 04:44 UTC1h 35m
2026-06-19 UPS3706 - Jun 19, 00:40 UTCJun 19, 02:09 UTC1h 30m
2026-06-18 UPS651 - Jun 18, 03:15 UTCJun 18, 04:25 UTC1h 10m
2026-06-18 UPS651 SGF → SDF Jun 18, 03:15 UTCJun 18, 04:21 UTC1h 6m
2026-06-17 UPS652 - Jun 17, 09:15 UTCJun 17, 10:20 UTC1h 5m
2026-06-17 UPS652 SDF → SGF Jun 17, 09:04 UTCJun 17, 10:18 UTC1h 14m
2026-06-17 UPS1365 - Jun 17, 02:55 UTCJun 17, 04:15 UTC1h 20m
2026-06-17 UPS9844 SYR → PHL Jun 17, 01:05 UTCJun 17, 01:50 UTC45m

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 N417UP page for operator, model, and routing details .

Mode-S A4EFF1 frequently asked

What is Mode-S code A4EFF1?
A4EFF1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N417UP.
Where is Mode-S A4EFF1 registered?
Mode-S code A4EFF1 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 A4EFF1 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4EFF1, octal 51167761, decimal 10,809,329.
What flights does A4EFF1 operate?
Mode-S A4EFF1 has broadcast 20 distinct callsigns, including UPS871, UPS1244, UPS5062, UPS1376, UPS1375.