Apparatus

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sensors Mode-S transponder

A33B23

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N307UP · BOEING 767-300 · operated by UNITED PARCEL SERVICE CO

Hex
A33B23
Octal
50635443
Decimal
10,697,507
Country
US
Tail
N307UP
Type
B763
Broadcasting now · callsign UPS5779 · 37,025 ft
Flights observed
373
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 17:00 UTC

Current position

A33B23 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A33B23 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
UPS492 United Parcel Service 8 2026-06-10
UPS491 United Parcel Service 7 2026-06-11
UPS920 - 6 2026-07-07
UPS474 - 6 2026-06-13
UPS400 - 6 2026-07-05
UPS990 United Parcel Service 5 2026-04-17
UPS981 - 5 2026-07-09
UPS606 United Parcel Service 5 2026-05-22
UPS5861 United Parcel Service 5 2026-07-25
UPS5609 United Parcel Service 5 2026-05-22
UPS401 - 5 2026-07-14
UPS973 - 4 2026-07-02
UPS959 United Parcel Service 4 2026-06-02
UPS798 - 4 2026-07-18
UPS5933 - 4 2026-07-07
UPS5842 United Parcel Service 4 2026-05-20
UPS5555 - 4 2026-04-16
UPS473 United Parcel Service 4 2026-05-22
UPS208 United Parcel Service 4 2026-04-14
UPS1220 United Parcel Service 4 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UPS5861 PHX → SDF Jul 25, 13:55 UTCJul 25, 17:00 UTC3h 5m
2026-07-25 UPS5861 PHX → SDF Jul 25, 13:44 UTCJul 25, 16:59 UTC3h 15m
2026-07-25 UPS858 SDF → PHX Jul 25, 08:50 UTCJul 25, 11:45 UTC2h 55m
2026-07-25 UPS858 SDF → PHX Jul 25, 08:40 UTCJul 25, 11:42 UTC3h 2m
2026-07-25 UPS767 DFW → SDF Jul 25, 02:55 UTCJul 25, 04:30 UTC1h 35m
2026-07-24 UPS5762 SDF → DFW Jul 24, 19:35 UTCJul 24, 21:15 UTC1h 40m
2026-07-24 UPS5063 BDL → RFD Jul 24, 11:35 UTCJul 24, 13:20 UTC1h 45m
2026-07-24 UPS1122 BDL → ALB Jul 24, 07:55 UTCJul 24, 08:30 UTC35m
2026-07-24 UPS1188 SDF → PHL Jul 24, 05:20 UTCJul 24, 06:35 UTC1h 15m
2026-07-24 UPS1441 CLE → SDF Jul 24, 01:35 UTCJul 24, 02:30 UTC55m
2026-07-23 UPS5442 SDF → CLE Jul 23, 22:05 UTCJul 23, 22:50 UTC45m
2026-07-21 UPS5359 MCO → SDF Jul 21, 12:30 UTCJul 21, 14:10 UTC1h 40m
2026-07-21 UPS1326 SDF → MCO Jul 21, 08:25 UTCJul 21, 09:55 UTC1h 30m
2026-07-21 UPS767 - Jul 21, 02:45 UTCJul 21, 04:25 UTC1h 40m
2026-07-20 UPS5780 SAT → DFW Jul 20, 00:10 UTCJul 20, 01:20 UTC1h 10m
2026-07-19 UPS5780 SAT → DFW Jul 19, 19:00 UTCJul 19, 21:00 UTC2h 0m
2026-07-19 UPS5861 - Jul 19, 13:25 UTCJul 19, 16:40 UTC3h 15m
2026-07-18 UPS7846 - Jul 18, 14:30 UTCJul 18, 15:05 UTC35m
2026-07-18 UPS798 - Jul 18, 12:25 UTCJul 18, 12:55 UTC30m
2026-07-18 UPS798 - Jul 18, 09:10 UTCJul 18, 11:05 UTC1h 55m
2026-07-18 UPS1063 BDL → SDF Jul 18, 02:05 UTCJul 18, 03:45 UTC1h 41m
2026-07-17 UPS5066 SDF → BDL Jul 17, 21:10 UTCJul 17, 22:49 UTC1h 40m
2026-07-17 UPS2751 - Jul 17, 12:55 UTCJul 17, 14:30 UTC1h 35m
2026-07-17 UPS762 SDF → DFW Jul 17, 07:44 UTCJul 17, 09:20 UTC1h 35m
2026-07-17 UPS1111 - Jul 17, 03:30 UTCJul 17, 05:10 UTC1h 40m
2026-07-16 UPS2114 - Jul 16, 20:00 UTCJul 16, 22:00 UTC2h 0m
2026-07-16 UPS5771 - Jul 16, 11:50 UTCJul 16, 13:30 UTC1h 40m
2026-07-16 UPS772 - Jul 16, 07:25 UTCJul 16, 09:05 UTC1h 40m
2026-07-15 UPS5063 - Jul 15, 11:35 UTCJul 15, 13:20 UTC1h 45m
2026-07-15 UPS1122 PHL → BDL Jul 15, 07:55 UTCJul 15, 08:35 UTC40m
2026-07-15 UPS1188 - Jul 15, 05:05 UTCJul 15, 06:25 UTC1h 20m
2026-07-15 UPS1321 - Jul 15, 02:00 UTCJul 15, 03:25 UTC1h 25m
2026-07-14 UPS5338 - Jul 14, 21:40 UTCJul 14, 23:00 UTC1h 19m
2026-07-14 UPS5338 SDF → JAX Jul 14, 21:39 UTCJul 14, 23:00 UTC1h 21m
2026-07-14 UPS2115 - Jul 14, 11:40 UTCJul 14, 13:05 UTC1h 25m
2026-07-14 UPS2115 JFK → SDF Jul 14, 11:48 UTCJul 14, 13:08 UTC1h 20m
2026-07-14 UPS1114 - Jul 14, 07:35 UTCJul 14, 09:05 UTC1h 30m
2026-07-14 UPS1114 SDF → JFK Jul 14, 07:34 UTCJul 14, 09:11 UTC1h 37m
2026-07-14 UPS401 - Jul 14, 02:45 UTCJul 14, 04:45 UTC2h 0m
2026-07-14 UPS401 MIA → SDF Jul 14, 01:13 UTCJul 14, 04:47 UTC3h 34m
2026-07-12 UPS1310 - Jul 12, 20:20 UTCJul 12, 22:20 UTC2h 0m
2026-07-12 UPS5303 - Jul 12, 11:25 UTCJul 12, 12:15 UTC50m
2026-07-11 UPS5306 - Jul 11, 23:05 UTCJul 12, 00:01 UTC55m
2026-07-11 UPS5337 - Jul 11, 12:15 UTCJul 11, 14:15 UTC2h 0m
2026-07-11 UPS304 - Jul 11, 06:25 UTCJul 11, 08:20 UTC1h 55m
2026-07-11 UPS301 MTY → SDF Jul 11, 01:30 UTCJul 11, 04:15 UTC2h 45m
2026-07-10 UPS300 - Jul 10, 09:50 UTCJul 10, 12:35 UTC2h 45m
2026-07-10 UPS300 SDF → MTY Jul 10, 09:45 UTCJul 10, 12:31 UTC2h 46m
2026-07-09 UPS2013 BOS → SDF Jul 9, 12:19 UTCJul 9, 14:24 UTC2h 5m
2026-07-09 UPS2013 - Jul 9, 12:20 UTCJul 9, 14:25 UTC2h 5m

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 N307UP page for operator, model, and routing details .

Mode-S A33B23 frequently asked

What is Mode-S code A33B23?
A33B23 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N307UP.
Where is Mode-S A33B23 registered?
Mode-S code A33B23 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 A33B23 broadcasting right now?
Yes. Mode-S A33B23 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A33B23, octal 50635443, decimal 10,697,507.
What flights does A33B23 operate?
Mode-S A33B23 has broadcast 20 distinct callsigns, including UPS492, UPS491, UPS920, UPS474, UPS400.