Apparatus

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sensors Mode-S transponder

A4C104

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N405UP · BOEING 757-200 · operated by UNITED PARCEL SERVICE CO

Hex
A4C104
Octal
51140404
Decimal
10,797,316
Country
US
Tail
N405UP
Type
B752
No current signal · last broadcast Jul 24, 11:00 UTC
Flights observed
232
Distinct callsigns
20
Country
US
Last broadcast
Jul 24, 11:00 UTC

Last known position

Most recent position reported by Mode-S A4C104.

Country allocation

The ICAO 24-bit address A4C104 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
UPS796 - 8 2026-06-23
UPS871 United Parcel Service 6 2026-05-15
UPS795 - 5 2026-06-24
UPS705 United Parcel Service 5 2026-04-25
UPS2870 United Parcel Service 5 2026-05-14
UPS9705 United Parcel Service 4 2026-05-15
UPS706 United Parcel Service 4 2026-04-24
UPS682 - 4 2026-07-14
UPS672 - 4 2026-06-19
UPS671 - 4 2026-06-20
UPS652 United Parcel Service 4 2026-04-23
UPS634 United Parcel Service 4 2026-05-22
UPS1278 - 4 2026-07-08
UPS938 United Parcel Service 3 2026-04-16
UPS887 United Parcel Service 3 2026-05-20
UPS837 United Parcel Service 3 2026-05-16
UPS753 - 3 2026-06-17
UPS711 United Parcel Service 3 2026-04-21
UPS651 United Parcel Service 3 2026-04-24
UPS5847 United Parcel Service 3 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 UPS9710 BWI → GSP Jul 24, 10:35 UTCJul 24, 11:00 UTC25m
2026-07-24 UPS610 PHL → ORD Jul 24, 07:40 UTCJul 24, 09:15 UTC1h 35m
2026-07-24 UPS1317 JAX → PHL Jul 24, 01:15 UTCJul 24, 03:00 UTC1h 45m
2026-07-23 UPS2320 JAX → PBI Jul 23, 18:55 UTCJul 23, 20:10 UTC1h 15m
2026-07-23 UPS7818 IAD → SDF Jul 23, 11:35 UTCJul 23, 12:45 UTC1h 10m
2026-07-23 UPS1218 RFD → IAD Jul 23, 08:30 UTCJul 23, 09:50 UTC1h 20m
2026-07-23 UPS909 ONT → RFD Jul 23, 02:45 UTCJul 23, 06:00 UTC3h 15m
2026-07-22 UPS5904 RFD → ONT Jul 22, 20:05 UTCJul 22, 23:45 UTC3h 40m
2026-07-22 UPS5847 SLC → RFD Jul 22, 14:05 UTCJul 22, 16:20 UTC2h 15m
2026-07-22 UPS9892 - Jul 22, 11:55 UTCJul 22, 12:50 UTC55m
2026-07-22 UPS1123 ALB → SDF Jul 22, 00:45 UTCJul 22, 02:30 UTC1h 45m
2026-07-21 UPS1124 SDF → ALB Jul 21, 08:40 UTCJul 21, 10:10 UTC1h 30m
2026-07-21 UPS1299 PVD → SDF Jul 21, 01:25 UTCJul 21, 03:25 UTC2h 0m
2026-07-17 UPS1128 - Jul 17, 08:10 UTCJul 17, 09:45 UTC1h 35m
2026-07-17 UPS301 MTY → SDF Jul 17, 01:29 UTCJul 17, 04:04 UTC2h 35m
2026-07-16 UPS300 - Jul 16, 09:50 UTCJul 16, 12:30 UTC2h 40m
2026-07-16 UPS613 - Jul 16, 03:50 UTCJul 16, 04:40 UTC50m
2026-07-16 UPS9775 - Jul 16, 00:40 UTCJul 16, 01:10 UTC30m
2026-07-15 UPS1476 - Jul 15, 08:25 UTCJul 15, 09:00 UTC35m
2026-07-15 UPS681 - Jul 15, 03:05 UTCJul 15, 03:55 UTC50m
2026-07-14 UPS682 - Jul 14, 08:35 UTCJul 14, 09:20 UTC45m
2026-07-14 UPS682 RFD → OMA Jul 14, 08:34 UTCJul 14, 09:22 UTC48m
2026-07-14 UPS1387 - Jul 14, 03:50 UTCJul 14, 05:00 UTC1h 10m
2026-07-14 UPS1387 MEM → RFD Jul 14, 03:46 UTCJul 14, 04:58 UTC1h 12m
2026-07-12 UPS5384 - Jul 12, 21:15 UTCJul 12, 22:00 UTC45m
2026-07-10 UPS7828 - Jul 10, 03:00 UTCJul 10, 04:15 UTC1h 15m
2026-07-09 UPS2682 - Jul 9, 21:10 UTCJul 9, 22:05 UTC55m
2026-07-09 UPS2671 - Jul 9, 13:25 UTCJul 9, 14:15 UTC50m
2026-07-09 UPS2671 OMA → RFD Jul 9, 13:19 UTCJul 9, 14:15 UTC56m
2026-07-09 UPS682 - Jul 9, 08:35 UTCJul 9, 09:30 UTC55m
2026-07-09 UPS682 RFD → OMA Jul 9, 08:38 UTCJul 9, 09:29 UTC51m
2026-07-09 UPS987 - Jul 9, 03:55 UTCJul 9, 06:50 UTC2h 55m
2026-07-08 UPS5980 DFW → BFI Jul 8, 18:45 UTCJul 8, 22:20 UTC3h 35m
2026-07-08 UPS5980 DFW → BFI Jul 8, 18:43 UTCJul 8, 22:10 UTC3h 27m
2026-07-08 UPS9745 RDU → DFW Jul 8, 09:40 UTCJul 8, 12:00 UTC2h 20m
2026-07-08 UPS9745 RDU → DFW Jul 8, 09:40 UTCJul 8, 11:58 UTC2h 18m
2026-07-08 UPS1278 - Jul 8, 07:40 UTCJul 8, 08:40 UTC1h 0m
2026-07-08 UPS1278 SDF → RDU Jul 8, 07:47 UTCJul 8, 08:38 UTC51m
2026-07-08 UPS1333 - Jul 8, 00:50 UTCJul 8, 02:40 UTC1h 50m
2026-07-07 UPS1328 - Jul 7, 07:30 UTCJul 7, 09:30 UTC2h 0m
2026-07-07 UPS1328 PHL → PBI Jul 7, 07:26 UTCJul 7, 09:28 UTC2h 2m
2026-07-07 UPS1323 MCO → PHL Jul 7, 01:15 UTCJul 7, 03:10 UTC1h 55m
2026-07-03 UPS1324 PHL → MCO Jul 3, 07:25 UTCJul 3, 09:20 UTC1h 55m
2026-07-03 UPS1324 PHL → MCO Jul 3, 07:28 UTCJul 3, 09:21 UTC1h 53m
2026-07-03 UPS1131 BUF → PHL Jul 3, 03:15 UTCJul 3, 04:00 UTC45m
2026-07-03 UPS1131 BUF → PHL Jul 3, 03:15 UTCJul 3, 04:02 UTC47m
2026-07-03 UPS1131 - Jul 3, 02:00 UTCJul 3, 02:25 UTC25m
2026-07-02 UPS1134 - Jul 2, 08:40 UTCJul 2, 08:55 UTC15m
2026-07-02 UPS1134 ALB → SYR Jul 2, 08:41 UTCJul 2, 09:03 UTC22m
2026-07-02 UPS1134 - Jul 2, 07:20 UTCJul 2, 08:00 UTC40m

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 N405UP page for operator, model, and routing details .

Mode-S A4C104 frequently asked

What is Mode-S code A4C104?
A4C104 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N405UP.
Where is Mode-S A4C104 registered?
Mode-S code A4C104 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 A4C104 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 11:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C104, octal 51140404, decimal 10,797,316.
What flights does A4C104 operate?
Mode-S A4C104 has broadcast 20 distinct callsigns, including UPS796, UPS871, UPS795, UPS705, UPS2870.