Apparatus

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sensors Mode-S transponder

A50126

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N421UP · BOEING 757-200 · operated by UNITED PARCEL SERVICE CO

Hex
A50126
Octal
51200446
Decimal
10,813,734
Country
US
Tail
N421UP
Type
B752
No current signal · last broadcast Jul 25, 13:10 UTC
Flights observed
178
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 13:10 UTC

Last known position

Most recent position reported by Mode-S A50126.

Country allocation

The ICAO 24-bit address A50126 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
UPS1347 - 11 2026-07-10
UPS1316 - 8 2026-07-09
UPS1234 - 6 2026-07-03
UPS1233 - 5 2026-07-04
UPS796 - 4 2026-07-01
UPS795 - 4 2026-07-02
UPS633 - 4 2026-06-17
UPS1132 - 4 2026-07-07
UPS990 United Parcel Service 3 2026-06-04
UPS5833 - 3 2026-06-18
UPS1468 - 3 2026-07-10
UPS1392 - 3 2026-06-23
UPS1391 - 3 2026-06-24
UPS1274 - 3 2026-07-08
UPS1124 United Parcel Service 3 2026-07-24
UPS996 - 2 2026-07-14
UPS994 - 2 2026-07-02
UPS988 - 2 2026-06-17
UPS9778 United Parcel Service 2 2026-06-17
UPS9502 United Parcel Service 2 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UPS896 SDF → RNO Jul 25, 09:50 UTCJul 25, 13:10 UTC3h 20m
2026-07-25 UPS1123 ALB → SDF Jul 25, 03:15 UTCJul 25, 04:10 UTC55m
2026-07-25 UPS1123 ALB → SDF Jul 25, 01:05 UTCJul 25, 02:25 UTC1h 20m
2026-07-24 UPS1124 SDF → ALB Jul 24, 08:50 UTCJul 24, 10:20 UTC1h 30m
2026-07-24 UPS1357 HSV → SDF Jul 24, 03:00 UTCJul 24, 03:50 UTC50m
2026-07-23 UPS1358 - Jul 23, 09:10 UTCJul 23, 09:45 UTC35m
2026-07-22 UPS5793 LBB → SDF Jul 22, 12:25 UTCJul 22, 14:25 UTC2h 0m
2026-07-22 UPS613 ORD → SDF Jul 22, 03:45 UTCJul 22, 04:35 UTC50m
2026-07-22 UPS9775 MHT → CLE Jul 22, 00:50 UTCJul 22, 01:25 UTC35m
2026-07-21 UPS1476 - Jul 21, 08:25 UTCJul 21, 09:05 UTC40m
2026-07-21 UPS9301 SDF → RFD Jul 21, 04:40 UTCJul 21, 05:20 UTC40m
2026-07-21 UPS9301 SDF → RFD Jul 21, 00:25 UTCJul 21, 01:40 UTC1h 15m
2026-07-16 UPS5233 - Jul 16, 11:15 UTCJul 16, 12:25 UTC1h 10m
2026-07-16 UPS1160 - Jul 16, 07:50 UTCJul 16, 08:30 UTC40m
2026-07-16 UPS1160 - Jul 16, 06:00 UTCJul 16, 06:50 UTC50m
2026-07-16 UPS1291 - Jul 16, 01:15 UTCJul 16, 02:05 UTC50m
2026-07-15 UPS1300 - Jul 15, 08:05 UTCJul 15, 08:35 UTC30m
2026-07-15 UPS1300 - Jul 15, 06:05 UTCJul 15, 06:55 UTC50m
2026-07-15 UPS1195 PHL → SDF Jul 15, 01:40 UTCJul 15, 03:00 UTC1h 20m
2026-07-14 UPS2020 DFW → PHL Jul 14, 20:10 UTCJul 14, 23:10 UTC2h 59m
2026-07-14 UPS2020 DFW → PHL Jul 14, 20:04 UTCJul 14, 23:04 UTC3h 0m
2026-07-14 UPS2977 PDX → DFW Jul 14, 12:55 UTCJul 14, 16:20 UTC3h 25m
2026-07-14 UPS2977 PDX → DFW Jul 14, 12:52 UTCJul 14, 16:15 UTC3h 23m
2026-07-14 UPS996 - Jul 14, 05:55 UTCJul 14, 09:50 UTC3h 55m
2026-07-14 UPS996 SDF → PDX Jul 14, 05:53 UTCJul 14, 09:50 UTC3h 57m
2026-07-14 UPS1467 - Jul 14, 02:40 UTCJul 14, 03:30 UTC50m
2026-07-14 UPS1467 SBN → SDF Jul 14, 02:38 UTCJul 14, 03:25 UTC47m
2026-07-10 UPS1468 - Jul 10, 11:05 UTCJul 10, 11:20 UTC15m
2026-07-10 UPS1468 FWA → SBN Jul 10, 11:06 UTCJul 10, 11:21 UTC15m
2026-07-10 UPS1468 - Jul 10, 09:35 UTCJul 10, 10:05 UTC30m
2026-07-10 UPS1347 - Jul 10, 02:55 UTCJul 10, 04:25 UTC1h 30m
2026-07-10 UPS1347 RSW → PNS Jul 10, 01:05 UTCJul 10, 02:10 UTC1h 5m
2026-07-09 UPS1316 - Jul 9, 09:50 UTCJul 9, 10:40 UTC50m
2026-07-09 UPS1316 JAX → RSW Jul 9, 09:52 UTCJul 9, 10:44 UTC52m
2026-07-09 UPS1316 - Jul 9, 07:20 UTCJul 9, 08:55 UTC1h 35m
2026-07-09 UPS1273 - Jul 9, 02:00 UTCJul 9, 03:00 UTC1h 0m
2026-07-08 UPS1274 - Jul 8, 07:20 UTCJul 8, 07:30 UTC10m
2026-07-08 UPS1274 PHL → RDU Jul 8, 07:19 UTCJul 8, 08:17 UTC58m
2026-07-08 UPS1131 - Jul 8, 03:30 UTCJul 8, 04:15 UTC45m
2026-07-08 UPS1131 - Jul 8, 01:55 UTCJul 8, 02:35 UTC40m
2026-07-07 UPS1132 - Jul 7, 09:05 UTCJul 7, 10:15 UTC1h 10m
2026-07-07 UPS1132 SDF → SYR Jul 7, 08:56 UTCJul 7, 10:17 UTC1h 21m
2026-07-07 UPS943 SJC → SDF Jul 7, 02:15 UTCJul 7, 06:05 UTC3h 50m
2026-07-07 UPS943 SJC → SDF Jul 7, 02:10 UTCJul 7, 05:58 UTC3h 48m
2026-07-07 UPS9843 MHR → SJC Jul 7, 00:05 UTCJul 7, 00:35 UTC30m
2026-07-05 UPS5954 - Jul 5, 21:05 UTCJul 6, 01:05 UTC4h 0m
2026-07-05 UPS5133 - Jul 5, 12:35 UTCJul 5, 14:05 UTC1h 30m
2026-07-05 UPS5133 SYR → SDF Jul 5, 12:35 UTCJul 5, 14:04 UTC1h 29m
2026-07-04 UPS1132 - Jul 4, 09:30 UTCJul 4, 10:45 UTC1h 15m
2026-07-04 UPS1132 SDF → SYR Jul 4, 09:27 UTCJul 4, 10:55 UTC1h 28m

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 N421UP page for operator, model, and routing details .

Mode-S A50126 frequently asked

What is Mode-S code A50126?
A50126 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N421UP.
Where is Mode-S A50126 registered?
Mode-S code A50126 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 A50126 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 13:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A50126, octal 51200446, decimal 10,813,734.
What flights does A50126 operate?
Mode-S A50126 has broadcast 20 distinct callsigns, including UPS1347, UPS1316, UPS1234, UPS1233, UPS796.