Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A77B6F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N581UP · BOEING 747-400 · operated by C C & E I LLC

Hex
A77B6F
Octal
51675557
Decimal
10,976,111
Country
US
Tail
N581UP
Type
B744
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
235
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A77B6F.

Country allocation

The ICAO 24-bit address A77B6F 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
UPS63 - 14 2026-07-15
UPS61 United Parcel Service 14 2026-06-10
UPS72 United Parcel Service 11 2026-07-23
UPS340 - 10 2026-07-15
UPS223 United Parcel Service 10 2026-04-23
UPS81 United Parcel Service 9 2026-06-06
UPS71 United Parcel Service 9 2026-07-24
UPS80 United Parcel Service 8 2026-06-04
UPS38 United Parcel Service 8 2026-06-14
UPS36 United Parcel Service 8 2026-06-13
UPS64 - 7 2026-07-10
UPS214 - 7 2026-06-12
UPS59 United Parcel Service 6 2026-06-02
UPS327 - 6 2026-07-15
UPS22 United Parcel Service 6 2026-05-30
UPS11 - 6 2026-06-19
UPS56 United Parcel Service 5 2026-06-06
UPS213 - 5 2026-06-22
UPS76 United Parcel Service 4 2026-07-26
UPS58 United Parcel Service 4 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UPS76 SDF → DWC Jul 26, 21:20 UTCJul 26, 21:45 UTC25m
2026-07-26 UPS210 CGN → PHL Jul 26, 05:40 UTCJul 26, 05:45 UTC5m
2026-07-26 UPS210 CGN → PHL Jul 26, 05:38 UTCJul 26, 14:07 UTC8h 29m
2026-07-25 UPS209 PHL → CGN Jul 25, 19:30 UTCJul 25, 21:45 UTC2h 15m
2026-07-25 UPS209 PHL → CGN Jul 25, 19:29 UTCJul 26, 02:58 UTC7h 29m
2026-07-25 UPS2907 ONT → SDF Jul 25, 11:45 UTCJul 25, 15:15 UTC3h 30m
2026-07-25 UPS2907 ONT → SDF Jul 25, 11:39 UTCJul 25, 15:15 UTC3h 36m
2026-07-24 UPS2904 BWI → PHL Jul 24, 19:35 UTCJul 24, 23:05 UTC3h 30m
2026-07-24 UPS71 ICN → SDF Jul 24, 10:00 UTCJul 24, 15:20 UTC5h 20m
2026-07-23 UPS71 ICN → SDF Jul 23, 21:55 UTCJul 24, 07:15 UTC9h 20m
2026-07-23 UPS74 ONT → SDF Jul 23, 18:00 UTCJul 23, 18:10 UTC10m
2026-07-23 UPS72 ANC → SZX Jul 23, 02:10 UTCJul 23, 12:35 UTC10h 25m
2026-07-22 UPS72 ANC → SZX Jul 22, 17:30 UTCJul 23, 00:00 UTC6h 30m
2026-07-21 UPS109 - Jul 21, 23:05 UTCJul 22, 04:25 UTC5h 20m
2026-07-21 UPS109 - Jul 21, 13:25 UTCJul 21, 19:20 UTC5h 55m
2026-07-20 UPS109 - Jul 20, 22:40 UTCJul 21, 11:25 UTC12h 45m
2026-07-19 UPS110 SDF → NRT Jul 19, 16:15 UTCJul 19, 23:00 UTC6h 45m
2026-07-18 UPS110 SDF → NRT Jul 18, 23:05 UTCJul 19, 05:25 UTC6h 20m
2026-07-18 UPS71 - Jul 18, 13:45 UTCJul 18, 19:20 UTC5h 35m
2026-07-18 UPS71 - Jul 18, 01:30 UTCJul 18, 11:20 UTC9h 51m
2026-07-17 UPS72 - Jul 17, 05:04 UTCJul 17, 14:39 UTC9h 35m
2026-07-16 UPS72 - Jul 16, 20:09 UTCJul 17, 02:20 UTC6h 10m
2026-07-16 UPS197 ANC → SDF Jul 16, 07:35 UTCJul 16, 13:05 UTC5h 30m
2026-07-15 UPS2998 - Jul 15, 21:00 UTCJul 16, 03:10 UTC6h 10m
2026-07-15 UPS327 SJU → SDF Jul 15, 14:45 UTCJul 15, 18:25 UTC3h 40m
2026-07-15 UPS340 - Jul 15, 11:50 UTCJul 15, 12:10 UTC20m
2026-07-15 UPS340 - Jul 15, 08:40 UTCJul 15, 09:50 UTC1h 10m
2026-07-15 UPS63 - Jul 15, 00:15 UTCJul 15, 05:55 UTC5h 40m
2026-07-14 UPS63 - Jul 14, 21:40 UTCJul 14, 21:55 UTC15m
2026-07-14 UPS63 - Jul 14, 11:30 UTCJul 14, 12:55 UTC1h 25m
2026-07-14 UPS63 ANC → SDF Jul 14, 11:27 UTCJul 14, 21:24 UTC9h 57m
2026-07-10 UPS64 ANC → HKG Jul 10, 19:33 UTCJul 11, 05:35 UTC10h 2m
2026-07-10 UPS64 - Jul 10, 19:45 UTCJul 10, 21:20 UTC1h 35m
2026-07-10 UPS9866 - Jul 10, 04:20 UTCJul 10, 09:55 UTC5h 35m
2026-07-10 UPS9866 HNL → ANC Jul 10, 04:17 UTCJul 10, 09:55 UTC5h 38m
2026-07-09 UPS5966 - Jul 9, 05:05 UTCJul 9, 05:25 UTC20m
2026-07-08 UPS5966 - Jul 8, 20:50 UTCJul 9, 01:15 UTC4h 25m
2026-07-08 UPS71 ANC → SDF Jul 8, 09:34 UTCJul 8, 15:27 UTC5h 53m
2026-07-08 UPS71 ANC → SDF Jul 8, 09:45 UTCJul 8, 15:35 UTC5h 50m
2026-07-07 UPS71 - Jul 7, 21:55 UTCJul 8, 07:40 UTC9h 45m
2026-07-07 UPS74 ONT → SDF Jul 7, 18:10 UTCJul 7, 18:25 UTC15m
2026-07-07 UPS74 ONT → SDF Jul 7, 17:10 UTCJul 7, 17:20 UTC10m
2026-07-07 UPS72 - Jul 7, 03:40 UTCJul 7, 14:40 UTC11h 0m
2026-07-07 UPS72 - Jul 7, 03:35 UTCJul 7, 05:10 UTC1h 35m
2026-07-06 UPS72 - Jul 6, 16:55 UTCJul 6, 23:05 UTC6h 10m
2026-07-05 UPS71 - Jul 5, 09:30 UTCJul 5, 15:05 UTC5h 35m
2026-07-04 UPS71 - Jul 4, 21:15 UTCJul 5, 07:00 UTC9h 45m
2026-07-04 UPS72 - Jul 4, 07:27 UTCJul 4, 17:43 UTC10h 16m
2026-07-04 UPS72 - Jul 4, 07:30 UTCJul 4, 08:55 UTC1h 25m
2026-07-03 UPS72 - Jul 3, 21:40 UTCJul 4, 03:25 UTC5h 45m

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 N581UP page for operator, model, and routing details .

Mode-S A77B6F frequently asked

What is Mode-S code A77B6F?
A77B6F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N581UP.
Where is Mode-S A77B6F registered?
Mode-S code A77B6F 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 A77B6F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A77B6F, octal 51675557, decimal 10,976,111.
What flights does A77B6F operate?
Mode-S A77B6F has broadcast 20 distinct callsigns, including UPS63, UPS61, UPS72, UPS340, UPS223.