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 17h ago
Flights observed
40
Distinct callsigns
20
Country
US
Last broadcast
17h ago

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 United Parcel Service 6 2026-05-21
UPS1316 United Parcel Service 3 2026-05-20
UPS9502 United Parcel Service 2 2026-05-06
UPS9307 United Parcel Service 2 2026-05-15
UPS652 United Parcel Service 2 2026-05-21
UPS651 United Parcel Service 2 2026-05-22
UPS582 United Parcel Service 2 2026-05-22
UPS1348 United Parcel Service 2 2026-05-15
UPS1124 United Parcel Service 2 2026-05-18
UPS9853 United Parcel Service 1 2026-05-07
UPS9305 United Parcel Service 1 2026-05-27
UPS9302 United Parcel Service 1 2026-05-28
UPS682 United Parcel Service 1 2026-05-28
UPS673 United Parcel Service 1 2026-05-29
UPS633 United Parcel Service 1 2026-05-28
UPS581 United Parcel Service 1 2026-05-23
UPS5674 United Parcel Service 1 2026-05-28
UPS4184 United Parcel Service 1 2026-05-26
UPS2870 United Parcel Service 1 2026-05-07
UPS2671 United Parcel Service 1 2026-05-28

Recent flights last 40

DateFlightRouteTakeoffLandingDuration
2026-05-29 UPS1446 PHL → CLE May 29, 08:15 UTCMay 29, 09:05 UTC50m
2026-05-29 UPS673 MCI → RFD May 29, 03:00 UTCMay 29, 03:50 UTC50m
2026-05-28 UPS5674 RFD → MCI May 28, 20:50 UTCMay 28, 21:40 UTC50m
2026-05-28 UPS2671 OMA → RFD May 28, 13:30 UTCMay 28, 14:15 UTC45m
2026-05-28 UPS682 SDF → FSD May 28, 08:40 UTCMay 28, 09:25 UTC45m
2026-05-28 UPS633 STL → RFD May 28, 03:40 UTCMay 28, 04:15 UTC35m
2026-05-28 UPS9302 MIA → SDF May 28, 01:35 UTCMay 28, 02:20 UTC45m
2026-05-27 UPS1173 MDT → SDF May 27, 03:20 UTCMay 27, 04:55 UTC1h 35m
2026-05-27 UPS9305 ONT → LGB May 27, 01:54 UTCMay 27, 02:19 UTC25m
2026-05-26 UPS4184 SDF → PHL May 26, 23:14 UTCMay 27, 00:34 UTC1h 20m
2026-05-23 UPS581 FAR → SDF May 23, 02:30 UTCMay 23, 04:20 UTC1h 50m
2026-05-22 UPS582 SDF → FAR May 22, 08:40 UTCMay 22, 10:30 UTC1h 50m
2026-05-22 UPS582 SDF → FAR May 22, 08:36 UTCMay 22, 10:33 UTC1h 57m
2026-05-22 UPS651 SGF → SDF May 22, 03:25 UTCMay 22, 04:25 UTC1h 0m
2026-05-22 UPS651 SGF → SDF May 22, 03:25 UTCMay 22, 04:25 UTC1h 0m
2026-05-21 UPS652 SDF → SGF May 21, 09:50 UTCMay 21, 10:55 UTC1h 5m
2026-05-21 UPS652 SDF → SGF May 21, 09:48 UTCMay 21, 10:51 UTC1h 3m
2026-05-21 UPS1347 MIA → SDF May 21, 02:35 UTCMay 21, 03:50 UTC1h 15m
2026-05-21 UPS1347 MIA → SDF May 21, 02:33 UTCMay 21, 03:52 UTC1h 19m
2026-05-21 UPS1347 MIA → SDF May 21, 00:15 UTCMay 21, 01:35 UTC1h 20m
2026-05-20 UPS1316 JAX → RSW May 20, 10:00 UTCMay 20, 10:50 UTC50m
2026-05-20 UPS1316 JAX → RSW May 20, 09:55 UTCMay 20, 10:45 UTC50m
2026-05-20 UPS1316 JAX → RSW May 20, 07:30 UTCMay 20, 09:05 UTC1h 35m
2026-05-20 UPS1273 RDU → PHL May 20, 02:05 UTCMay 20, 03:10 UTC1h 5m
2026-05-19 UPS1274 PHL → RDU May 19, 07:55 UTCMay 19, 08:45 UTC50m
2026-05-19 UPS1055 MHT → PHL May 19, 01:40 UTCMay 19, 02:40 UTC1h 0m
2026-05-18 UPS1124 SDF → ALB May 18, 01:20 UTCMay 18, 01:45 UTC25m
2026-05-16 UPS1124 SDF → ALB May 16, 09:56 UTCMay 16, 11:25 UTC1h 30m
2026-05-16 UPS1347 MIA → SDF May 16, 03:05 UTCMay 16, 04:30 UTC1h 25m
2026-05-16 UPS1347 MIA → SDF May 16, 03:03 UTCMay 16, 04:26 UTC1h 23m
2026-05-16 UPS1347 MIA → SDF May 16, 01:00 UTCMay 16, 02:10 UTC1h 10m
2026-05-15 UPS1348 SDF → RSW May 15, 09:30 UTCMay 15, 11:15 UTC1h 45m
2026-05-15 UPS1348 SDF → RSW May 15, 09:28 UTCMay 15, 11:13 UTC1h 45m
2026-05-15 UPS9307 CLT → DFW May 15, 03:50 UTCMay 15, 06:15 UTC2h 25m
2026-05-15 UPS9307 CLT → DFW May 15, 03:49 UTCMay 15, 06:12 UTC2h 23m
2026-05-07 UPS2870 SDF → PHX May 7, 22:00 UTCMay 8, 00:49 UTC2h 50m
2026-05-07 UPS9853 MHT → SDF May 7, 10:30 UTCMay 7, 12:50 UTC2h 20m
2026-05-07 UPS1016 SDF → BOS May 7, 06:35 UTCMay 7, 08:05 UTC1h 30m
2026-05-06 UPS9502 ROW → SDF May 6, 13:30 UTCMay 6, 14:55 UTC1h 25m
2026-05-06 UPS9502 ROW → SDF May 6, 13:31 UTCMay 6, 15:00 UTC1h 29m

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 17h ago.
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, UPS9502, UPS9307, UPS652.