Apparatus

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sensors Mode-S transponder

A771A8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N579UP · BOEING 747-400 · operated by UNITED PARCEL SERVICE CO

Hex
A771A8
Octal
51670650
Decimal
10,973,608
Country
US
Tail
N579UP
Type
B744
Broadcasting now · callsign UPS94 · 40,000 ft
Flights observed
242
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:10 UTC

Current position

A771A8 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A771A8 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
UPS81 - 21 2026-07-13
UPS9 United Parcel Service 14 2026-05-27
UPS340 - 14 2026-07-17
UPS80 United Parcel Service 13 2026-04-16
UPS67 - 10 2026-06-17
UPS327 - 7 2026-07-16
UPS71 United Parcel Service 6 2026-06-14
UPS64 United Parcel Service 6 2026-06-19
UPS4 United Parcel Service 6 2026-05-21
UPS204 United Parcel Service 6 2026-05-30
UPS8 - 5 2026-05-26
UPS76 - 5 2026-07-19
UPS63 - 5 2026-06-19
UPS60 United Parcel Service 5 2026-07-26
UPS559 - 5 2026-07-10
UPS82 United Parcel Service 4 2026-04-13
UPS77 United Parcel Service 4 2026-07-20
UPS72 - 4 2026-06-13
UPS62 United Parcel Service 4 2026-05-03
UPS6077 United Parcel Service 4 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UPS60 ANC → HKG Jul 26, 16:30 UTCJul 26, 18:10 UTC1h 40m
2026-07-26 UPS60 ANC → HKG Jul 26, 08:15 UTCJul 26, 14:25 UTC6h 10m
2026-07-24 UPS5915 - Jul 24, 13:40 UTCJul 24, 17:05 UTC3h 25m
2026-07-24 UPS5967 HNL → ONT Jul 24, 06:10 UTCJul 24, 11:05 UTC4h 55m
2026-07-23 UPS2252 SDF → HNL Jul 23, 19:10 UTCJul 24, 03:40 UTC8h 30m
2026-07-20 UPS77 ANC → SDF Jul 20, 23:50 UTCJul 21, 05:15 UTC5h 25m
2026-07-20 UPS77 ANC → SDF Jul 20, 11:40 UTCJul 20, 21:50 UTC10h 10m
2026-07-19 UPS76 - Jul 19, 08:15 UTCJul 19, 08:25 UTC10m
2026-07-18 UPS76 - Jul 18, 22:25 UTCJul 19, 06:05 UTC7h 40m
2026-07-18 UPS76 - Jul 18, 09:35 UTCJul 18, 15:45 UTC6h 10m
2026-07-18 UPS329 SJU → SDF Jul 18, 02:29 UTCJul 18, 06:10 UTC3h 41m
2026-07-17 UPS340 - Jul 17, 12:04 UTCJul 17, 12:25 UTC20m
2026-07-17 UPS340 - Jul 17, 08:49 UTCJul 17, 10:05 UTC1h 15m
2026-07-16 UPS327 - Jul 16, 08:40 UTCJul 16, 18:29 UTC9h 50m
2026-07-15 UPS197 - Jul 15, 07:25 UTCJul 15, 13:00 UTC5h 35m
2026-07-14 UPS2998 - Jul 14, 21:05 UTCJul 15, 03:20 UTC6h 14m
2026-07-14 UPS2915 - Jul 14, 13:25 UTCJul 14, 17:00 UTC3h 35m
2026-07-14 UPS2915 ONT → SDF Jul 14, 13:30 UTCJul 14, 17:00 UTC3h 30m
2026-07-13 UPS81 ANC → ONT Jul 13, 23:31 UTCJul 14, 04:08 UTC4h 37m
2026-07-13 UPS81 ANC → ONT Jul 13, 23:31 UTCJul 14, 04:13 UTC4h 42m
2026-07-13 UPS81 - Jul 13, 23:45 UTCJul 14, 00:25 UTC40m
2026-07-13 UPS109 NRT → ANC Jul 13, 13:10 UTCJul 13, 19:35 UTC6h 25m
2026-07-13 UPS109D - Jul 13, 06:20 UTCJul 13, 08:01 UTC1h 40m
2026-07-12 UPS108 - Jul 12, 02:35 UTCJul 12, 04:05 UTC1h 30m
2026-07-11 UPS108 - Jul 11, 11:10 UTCJul 11, 23:30 UTC12h 20m
2026-07-11 UPS329 - Jul 11, 02:25 UTCJul 11, 06:05 UTC3h 40m
2026-07-10 UPS340 - Jul 10, 13:05 UTCJul 10, 13:20 UTC15m
2026-07-10 UPS340 - Jul 10, 09:40 UTCJul 10, 11:25 UTC1h 45m
2026-07-10 UPS340 SDF → SJU Jul 10, 09:40 UTCJul 10, 13:17 UTC3h 37m
2026-07-10 UPS559 - Jul 10, 02:45 UTCJul 10, 04:05 UTC1h 20m
2026-07-09 UPS2568 - Jul 9, 21:05 UTCJul 9, 22:35 UTC1h 30m
2026-07-09 UPS5967 - Jul 9, 06:45 UTCJul 9, 14:20 UTC7h 35m
2026-07-09 UPS2252 - Jul 9, 04:00 UTCJul 9, 04:15 UTC15m
2026-07-08 UPS2252 - Jul 8, 19:40 UTCJul 9, 00:00 UTC4h 20m
2026-07-08 UPS559 MSP → SDF Jul 8, 02:45 UTCJul 8, 04:10 UTC1h 25m
2026-07-08 UPS559 MSP → SDF Jul 8, 02:41 UTCJul 8, 04:04 UTC1h 23m
2026-07-07 UPS2568 - Jul 7, 21:25 UTCJul 7, 22:50 UTC1h 25m
2026-07-07 UPS327 SJU → SDF Jul 7, 14:55 UTCJul 7, 18:35 UTC3h 40m
2026-07-07 UPS327 SJU → SDF Jul 7, 14:51 UTCJul 7, 18:33 UTC3h 42m
2026-07-07 UPS340 - Jul 7, 12:00 UTCJul 7, 12:25 UTC25m
2026-07-07 UPS340 - Jul 7, 08:50 UTCJul 7, 10:35 UTC1h 45m
2026-07-07 UPS340 SDF → SJU Jul 7, 08:50 UTCJul 7, 12:22 UTC3h 32m
2026-07-04 UPS6077 ANC → SDF Jul 4, 21:20 UTCJul 5, 02:55 UTC5h 35m
2026-07-01 UPS1939 - Jul 1, 12:20 UTCJul 1, 13:40 UTC1h 20m
2026-07-01 UPS1939 HKG → ANC Jul 1, 12:10 UTCJul 1, 21:34 UTC9h 24m
2026-06-30 UPS1938 HNL → HKG Jun 30, 19:35 UTCJun 30, 20:00 UTC25m
2026-06-30 UPS1938 HNL → HKG Jun 30, 19:37 UTCJul 1, 05:47 UTC10h 10m
2026-06-30 UPS56 - Jun 30, 10:30 UTCJun 30, 15:55 UTC5h 25m
2026-06-30 UPS56 ONT → HNL Jun 30, 10:31 UTCJun 30, 15:53 UTC5h 22m
2026-06-30 UPS59 ANC → ONT Jun 30, 02:50 UTCJun 30, 07:15 UTC4h 25m

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 N579UP page for operator, model, and routing details .

Mode-S A771A8 frequently asked

What is Mode-S code A771A8?
A771A8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N579UP.
Where is Mode-S A771A8 registered?
Mode-S code A771A8 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 A771A8 broadcasting right now?
Yes. Mode-S A771A8 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A771A8, octal 51670650, decimal 10,973,608.
What flights does A771A8 operate?
Mode-S A771A8 has broadcast 20 distinct callsigns, including UPS81, UPS9, UPS340, UPS80, UPS67.