Apparatus

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sensors Mode-S transponder

A50C4B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N424UP · BOEING 757-200 · operated by UNITED PARCEL SERVICE CO

Hex
A50C4B
Octal
51206113
Decimal
10,816,587
Country
US
Tail
N424UP
Type
B752
No current signal · last broadcast Jul 19, 13:05 UTC
Flights observed
254
Distinct callsigns
20
Country
US
Last broadcast
Jul 19, 13:05 UTC

Last known position

Most recent position reported by Mode-S A50C4B.

Country allocation

The ICAO 24-bit address A50C4B 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
UPS896 - 7 2026-07-15
UPS888 - 6 2026-07-01
UPS887 - 6 2026-07-02
UPS706 United Parcel Service 6 2026-05-30
UPS2784 United Parcel Service 6 2026-05-20
UPS1038 - 6 2026-07-10
UPS9821 - 5 2026-06-24
UPS943 United Parcel Service 5 2026-05-29
UPS5996 United Parcel Service 5 2026-05-28
UPS598 - 5 2026-06-24
UPS5847 - 5 2026-06-24
UPS5806 United Parcel Service 5 2026-05-07
UPS1468 United Parcel Service 5 2026-05-13
UPS1392 United Parcel Service 5 2026-06-09
UPS1391 - 5 2026-07-16
UPS1029 - 5 2026-07-14
UPS9762 United Parcel Service 4 2026-05-14
UPS846 - 4 2026-07-14
UPS805 United Parcel Service 4 2026-05-08
UPS783 United Parcel Service 4 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-19 UPS9501 - Jul 19, 11:55 UTCJul 19, 13:05 UTC1h 10m
2026-07-18 UPS495 OMA → SDF Jul 18, 00:35 UTCJul 18, 02:35 UTC2h 0m
2026-07-17 UPS496 MSP → YWG Jul 17, 11:25 UTCJul 17, 12:25 UTC1h 0m
2026-07-17 UPS554 - Jul 17, 06:50 UTCJul 17, 08:04 UTC1h 15m
2026-07-16 UPS1391 - Jul 16, 09:05 UTCJul 17, 03:25 UTC18h 20m
2026-07-16 UPS895 - Jul 16, 02:05 UTCJul 16, 05:40 UTC3h 35m
2026-07-15 UPS896 - Jul 15, 08:05 UTCJul 15, 11:35 UTC3h 30m
2026-07-15 UPS837 - Jul 15, 01:05 UTCJul 15, 04:25 UTC3h 20m
2026-07-14 UPS2838 - Jul 14, 19:40 UTCJul 14, 22:45 UTC3h 4m
2026-07-14 UPS2838 SDF → BOI Jul 14, 19:41 UTCJul 14, 22:51 UTC3h 10m
2026-07-14 UPS2843 SLC → SDF Jul 14, 11:50 UTCJul 14, 14:55 UTC3h 5m
2026-07-14 UPS2843 SLC → SDF Jul 14, 11:42 UTCJul 14, 14:52 UTC3h 10m
2026-07-14 UPS846 - Jul 14, 08:05 UTCJul 14, 10:30 UTC2h 25m
2026-07-14 UPS846 RFD → SLC Jul 14, 08:04 UTCJul 14, 10:32 UTC2h 28m
2026-07-14 UPS1029 - Jul 14, 02:10 UTCJul 14, 04:00 UTC1h 50m
2026-07-14 UPS1029 BDL → RFD Jul 14, 02:01 UTCJul 14, 03:59 UTC1h 58m
2026-07-10 UPS1038 - Jul 10, 08:15 UTCJul 10, 09:50 UTC1h 35m
2026-07-10 UPS1038 RFD → BDL Jul 10, 08:13 UTCJul 10, 09:53 UTC1h 40m
2026-07-10 UPS1085 - Jul 10, 03:05 UTCJul 10, 04:55 UTC1h 50m
2026-07-09 UPS5086 DFW → EWR Jul 9, 22:20 UTCJul 10, 01:35 UTC3h 15m
2026-07-08 UPS7885 - Jul 8, 11:30 UTCJul 8, 12:35 UTC1h 5m
2026-07-08 UPS7885 MCI → DFW Jul 8, 11:27 UTCJul 8, 12:28 UTC1h 1m
2026-07-08 UPS674 - Jul 8, 08:45 UTCJul 8, 09:30 UTC45m
2026-07-08 UPS674 RFD → MCI Jul 8, 08:46 UTCJul 8, 09:33 UTC47m
2026-07-08 UPS1387 - Jul 8, 03:50 UTCJul 8, 04:55 UTC1h 5m
2026-07-08 UPS1387 MEM → RFD Jul 8, 03:42 UTCJul 8, 05:06 UTC1h 24m
2026-07-07 UPS1382 - Jul 7, 08:25 UTCJul 7, 09:40 UTC1h 15m
2026-07-07 UPS1382 RFD → MEM Jul 7, 08:22 UTCJul 7, 09:40 UTC1h 18m
2026-07-07 UPS909 - Jul 7, 02:40 UTCJul 7, 05:55 UTC3h 15m
2026-07-07 UPS909 LGB → RFD Jul 7, 02:40 UTCJul 7, 05:48 UTC3h 8m
2026-07-06 UPS7806 - Jul 6, 22:35 UTCJul 7, 00:25 UTC1h 50m
2026-07-03 UPS834 - Jul 3, 09:15 UTCJul 3, 10:35 UTC1h 20m
2026-07-03 UPS834 ONT → BOI Jul 3, 09:07 UTCJul 3, 10:44 UTC1h 37m
2026-07-02 UPS887 PHX → ONT Jul 2, 05:00 UTCJul 2, 05:50 UTC50m
2026-07-02 UPS887 PHX → ONT Jul 2, 05:01 UTCJul 2, 05:45 UTC44m
2026-07-02 UPS887 - Jul 2, 03:15 UTCJul 2, 04:05 UTC50m
2026-07-01 UPS888 - Jul 1, 09:50 UTCJul 1, 11:10 UTC1h 20m
2026-07-01 UPS888 ONT → ABQ Jul 1, 09:52 UTCJul 1, 11:06 UTC1h 14m
2026-07-01 UPS887 PHX → ONT Jul 1, 04:45 UTCJul 1, 05:30 UTC45m
2026-07-01 UPS887 PHX → ONT Jul 1, 04:54 UTCJul 1, 05:28 UTC34m
2026-07-01 UPS887 - Jul 1, 03:05 UTCJul 1, 03:55 UTC50m
2026-06-30 UPS888 - Jun 30, 10:00 UTCJun 30, 11:15 UTC1h 15m
2026-06-30 UPS888 ONT → ABQ Jun 30, 10:03 UTCJun 30, 11:17 UTC1h 14m
2026-06-30 UPS769 DFW → ONT Jun 30, 01:35 UTCJun 30, 04:10 UTC2h 35m
2026-06-30 UPS769 DFW → ONT Jun 30, 01:30 UTCJun 30, 04:04 UTC2h 34m
2026-06-26 UPS5795 DFW → RFD Jun 26, 13:49 UTCJun 26, 14:39 UTC50m
2026-06-26 UPS776 - Jun 26, 10:25 UTCJun 26, 12:39 UTC2h 15m
2026-06-26 UPS937 - Jun 26, 01:34 UTCJun 26, 04:55 UTC3h 20m
2026-06-25 UPS938 - Jun 25, 07:54 UTCJun 25, 12:04 UTC4h 10m
2026-06-25 UPS7828 - Jun 25, 03:10 UTCJun 25, 04:25 UTC1h 15m

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 N424UP page for operator, model, and routing details .

Mode-S A50C4B frequently asked

What is Mode-S code A50C4B?
A50C4B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N424UP.
Where is Mode-S A50C4B registered?
Mode-S code A50C4B 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 A50C4B broadcasting right now?
No active broadcast right now. Last signal was Jul 19, 13:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A50C4B, octal 51206113, decimal 10,816,587.
What flights does A50C4B operate?
Mode-S A50C4B has broadcast 20 distinct callsigns, including UPS896, UPS888, UPS887, UPS706, UPS2784.