Apparatus

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sensors Mode-S transponder

A8C88F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N665UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A8C88F
Octal
52144217
Decimal
11,061,391
Country
US
Tail
N665UA
Type
B763
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
166
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A8C88F.

Country allocation

The ICAO 24-bit address A8C88F 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
UAL967 - 14 2026-07-10
UAL966 United Airlines 11 2026-06-18
UAL940 - 10 2026-06-30
UAL15 United Airlines 9 2026-07-26
UAL941 - 8 2026-07-18
UAL273 - 8 2026-07-16
UAL135 United Airlines 8 2026-07-24
UAL965 - 7 2026-07-13
UAL957 - 7 2026-07-14
UAL956 - 7 2026-07-13
UAL272 - 7 2026-07-16
UAL147 - 7 2026-06-30
UAL134 United Airlines 7 2026-07-24
UAL964 - 6 2026-07-12
UAL904 - 6 2026-06-28
UAL16 - 6 2026-07-04
UAL920 United Airlines 4 2026-06-20
UAL146 United Airlines 4 2026-07-18
UAL962 United Airlines 3 2026-06-21
UAL959 - 3 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL15 LHR → EWR Jul 26, 14:45 UTCJul 26, 21:45 UTC7h 0m
2026-07-25 UAL929 ORD → LHR Jul 25, 22:00 UTCJul 26, 05:45 UTC7h 45m
2026-07-25 UAL12 HNL → LAX Jul 25, 08:15 UTCJul 25, 17:10 UTC8h 55m
2026-07-24 UAL134 EWR → ZRH Jul 24, 23:04 UTCJul 25, 05:52 UTC6h 48m
2026-07-24 UAL134 EWR → ZRH Jul 24, 22:45 UTCJul 25, 05:45 UTC7h 0m
2026-07-24 UAL135 ZRH → EWR Jul 24, 08:38 UTCJul 24, 16:47 UTC8h 9m
2026-07-24 UAL135 ZRH → EWR Jul 24, 08:40 UTCJul 24, 17:00 UTC8h 20m
2026-07-23 UAL3 LAX → HNL Jul 23, 21:40 UTCJul 24, 05:40 UTC8h 0m
2026-07-23 UAL3 LAX → HNL Jul 23, 21:42 UTCJul 24, 05:37 UTC7h 55m
2026-07-23 UAL958 ORD → LHR Jul 23, 07:10 UTCJul 23, 15:20 UTC8h 10m
2026-07-22 UAL934 - Jul 22, 12:55 UTCJul 22, 19:15 UTC6h 20m
2026-07-18 UAL941 - Jul 18, 15:30 UTCJul 18, 22:45 UTC7h 15m
2026-07-18 UAL146 EWR → LHR Jul 18, 02:45 UTCJul 18, 09:25 UTC6h 41m
2026-07-17 UAL135 - Jul 17, 10:35 UTCJul 17, 18:44 UTC8h 10m
2026-07-16 UAL134 - Jul 16, 22:59 UTCJul 17, 06:05 UTC7h 5m
2026-07-16 UAL273 NCE → EWR Jul 16, 11:15 UTCJul 16, 19:55 UTC8h 40m
2026-07-16 UAL272 - Jul 16, 00:25 UTCJul 16, 08:15 UTC7h 50m
2026-07-15 UAL273 NCE → EWR Jul 15, 11:15 UTCJul 15, 20:10 UTC8h 55m
2026-07-15 UAL273 NCE → EWR Jul 15, 11:20 UTCJul 15, 20:04 UTC8h 44m
2026-07-15 UAL272 EWR → NCE Jul 15, 00:20 UTCJul 15, 07:41 UTC7h 21m
2026-07-15 UAL272 - Jul 15, 00:10 UTCJul 15, 07:45 UTC7h 35m
2026-07-14 UAL957 - Jul 14, 07:30 UTCJul 14, 15:20 UTC7h 50m
2026-07-13 UAL956 - Jul 13, 21:55 UTCJul 14, 05:20 UTC7h 25m
2026-07-13 UAL965 - Jul 13, 09:10 UTCJul 13, 11:55 UTC2h 45m
2026-07-13 UAL965 NAP → EWR Jul 13, 08:09 UTCJul 13, 18:20 UTC10h 11m
2026-07-12 UAL964 EWR → NAP Jul 12, 20:43 UTCJul 13, 04:37 UTC7h 54m
2026-07-12 UAL964 - Jul 12, 20:30 UTCJul 13, 04:35 UTC8h 5m
2026-07-12 UAL135 - Jul 12, 15:30 UTCJul 12, 17:01 UTC1h 30m
2026-07-12 UAL135 - Jul 12, 08:35 UTCJul 12, 15:25 UTC6h 50m
2026-07-11 UAL134 - Jul 11, 22:50 UTCJul 12, 05:45 UTC6h 55m
2026-07-11 UAL134 EWR → ZRH Jul 11, 22:39 UTCJul 12, 06:04 UTC7h 25m
2026-07-10 UAL967 - Jul 10, 21:20 UTCJul 10, 23:15 UTC1h 55m
2026-07-10 UAL967 - Jul 10, 13:55 UTCJul 10, 16:55 UTC3h 0m
2026-07-09 UAL964 - Jul 9, 20:45 UTCJul 10, 04:40 UTC7h 55m
2026-07-09 UAL957 GVA → EWR Jul 9, 07:30 UTCJul 9, 15:40 UTC8h 10m
2026-07-08 UAL956 EWR → GVA Jul 8, 22:10 UTCJul 9, 05:25 UTC7h 15m
2026-07-08 UAL135 ZRH → EWR Jul 8, 08:35 UTCJul 8, 17:10 UTC8h 35m
2026-07-08 UAL135 ZRH → EWR Jul 8, 08:30 UTCJul 8, 17:06 UTC8h 36m
2026-07-07 UAL3 LAX → HNL Jul 7, 22:10 UTCJul 8, 06:20 UTC8h 10m
2026-07-06 UAL12 ZRH → ORD Jul 6, 13:20 UTCJul 6, 22:10 UTC8h 50m
2026-07-06 UAL134 - Jul 6, 03:45 UTCJul 6, 10:45 UTC7h 0m
2026-07-05 UAL941 - Jul 5, 15:35 UTCJul 5, 23:00 UTC7h 25m
2026-07-05 UAL941 LHR → EWR Jul 5, 15:24 UTCJul 5, 23:02 UTC7h 38m
2026-07-04 UAL16 EWR → LHR Jul 4, 21:58 UTCJul 5, 04:25 UTC6h 27m
2026-07-04 UAL16 - Jul 4, 21:55 UTCJul 5, 03:45 UTC5h 50m
2026-07-04 UAL965 - Jul 4, 08:00 UTCJul 4, 17:40 UTC9h 40m
2026-07-04 UAL965 NAP → EWR Jul 4, 08:09 UTCJul 4, 17:37 UTC9h 28m
2026-07-03 UAL964 EWR → NAP Jul 3, 20:43 UTCJul 4, 04:30 UTC7h 47m
2026-07-03 UAL964 - Jul 3, 20:35 UTCJul 4, 04:30 UTC7h 55m
2026-07-03 UAL306 - Jul 3, 08:00 UTCJul 3, 17:15 UTC9h 15m

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 N665UA page for operator, model, and routing details .

Mode-S A8C88F frequently asked

What is Mode-S code A8C88F?
A8C88F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N665UA.
Where is Mode-S A8C88F registered?
Mode-S code A8C88F 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 A8C88F 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 A8C88F, octal 52144217, decimal 11,061,391.
What flights does A8C88F operate?
Mode-S A8C88F has broadcast 20 distinct callsigns, including UAL967, UAL966, UAL940, UAL15, UAL941.