Apparatus

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sensors Mode-S transponder

A8CC46

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N666UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A8CC46
Octal
52146106
Decimal
11,062,342
Country
US
Tail
N666UA
Type
B763
No current signal · last broadcast 2d ago
Flights observed
236
Distinct callsigns
20
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A8CC46.

Country allocation

The ICAO 24-bit address A8CC46 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
UAL31 United Airlines 15 2026-07-25
UAL957 United Airlines 12 2026-07-24
UAL959 United Airlines 11 2026-07-21
UAL938 - 11 2026-07-07
UAL921 - 10 2026-07-07
UAL30 United Airlines 10 2026-07-24
UAL940 United Airlines 9 2026-07-21
UAL920 - 9 2026-07-13
UAL3 - 9 2026-07-21
UAL956 United Airlines 8 2026-07-23
UAL147 - 8 2026-07-10
UAL135 United Airlines 8 2026-07-22
UAL967 - 7 2026-07-06
UAL965 United Airlines 7 2026-07-23
UAL934 United Airlines 7 2026-06-27
UAL904 United Airlines 7 2026-07-26
UAL15 - 7 2026-07-18
UAL966 - 6 2026-07-06
UAL958 - 6 2026-06-28
UAL272 - 6 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL928 LHR → ORD Jul 26, 13:35 UTCJul 26, 21:30 UTC7h 55m
2026-07-26 UAL904 EWR → LHR Jul 26, 00:20 UTCJul 26, 06:33 UTC6h 13m
2026-07-26 UAL904 EWR → LHR Jul 26, 00:05 UTCJul 26, 06:45 UTC6h 41m
2026-07-25 UAL31 MUC → EWR Jul 25, 08:25 UTCJul 25, 16:50 UTC8h 25m
2026-07-25 UAL31 MUC → EWR Jul 25, 08:07 UTCJul 25, 16:46 UTC8h 39m
2026-07-24 UAL30 EWR → MUC Jul 24, 21:20 UTCJul 25, 04:35 UTC7h 15m
2026-07-24 UAL957 GVA → EWR Jul 24, 07:30 UTCJul 24, 15:25 UTC7h 55m
2026-07-23 UAL956 EWR → GVA Jul 23, 21:45 UTCJul 24, 04:45 UTC7h 0m
2026-07-23 UAL965 NAP → EWR Jul 23, 08:00 UTCJul 23, 17:30 UTC9h 30m
2026-07-23 UAL965 NAP → EWR Jul 23, 08:09 UTCJul 23, 17:17 UTC9h 8m
2026-07-22 UAL964 EWR → NAP Jul 22, 21:00 UTCJul 23, 04:55 UTC7h 55m
2026-07-22 UAL135 ZRH → EWR Jul 22, 08:30 UTCJul 22, 17:14 UTC8h 44m
2026-07-22 UAL135 ZRH → EWR Jul 22, 08:30 UTCJul 22, 17:16 UTC8h 46m
2026-07-21 UAL3 - Jul 21, 22:00 UTCJul 22, 10:25 UTC12h 25m
2026-07-21 UAL959 LHR → ORD Jul 21, 18:30 UTCJul 21, 18:35 UTC5m
2026-07-21 UAL959 LHR → ORD Jul 21, 10:25 UTCJul 21, 11:45 UTC1h 20m
2026-07-21 UAL959 LHR → ORD Jul 21, 10:30 UTCJul 21, 18:12 UTC7h 42m
2026-07-21 UAL940 EWR → LHR Jul 21, 01:30 UTCJul 21, 03:15 UTC1h 45m
2026-07-21 UAL940 EWR → LHR Jul 21, 01:23 UTCJul 21, 07:58 UTC6h 35m
2026-07-18 UAL15 - Jul 18, 15:10 UTCJul 18, 22:20 UTC7h 10m
2026-07-18 UAL940 EWR → LHR Jul 18, 01:31 UTCJul 18, 08:24 UTC6h 53m
2026-07-18 UAL940 EWR → LHR Jul 18, 01:39 UTCJul 18, 03:20 UTC1h 41m
2026-07-17 UAL963 BER → EWR Jul 17, 09:55 UTCJul 17, 17:55 UTC8h 0m
2026-07-16 UAL962 - Jul 16, 21:40 UTCJul 17, 04:59 UTC7h 20m
2026-07-16 UAL957 - Jul 16, 09:25 UTCJul 16, 11:34 UTC2h 10m
2026-07-16 UAL957 GVA → EWR Jul 16, 09:17 UTCJul 16, 17:16 UTC7h 59m
2026-07-15 UAL956 - Jul 15, 23:50 UTCJul 16, 07:05 UTC7h 15m
2026-07-15 UAL957 - Jul 15, 07:35 UTCJul 15, 15:55 UTC8h 20m
2026-07-15 UAL957 GVA → EWR Jul 15, 07:37 UTCJul 15, 15:57 UTC8h 20m
2026-07-14 UAL956 EWR → GVA Jul 14, 21:40 UTCJul 15, 05:15 UTC7h 34m
2026-07-14 UAL17 - Jul 14, 09:45 UTCJul 14, 16:50 UTC7h 5m
2026-07-13 UAL920 ORD → LHR Jul 13, 23:45 UTCJul 14, 07:20 UTC7h 35m
2026-07-13 UAL12 ZRH → ORD Jul 13, 08:15 UTCJul 13, 17:25 UTC9h 10m
2026-07-12 UAL134 EWR → ZRH Jul 12, 22:39 UTCJul 13, 05:44 UTC7h 5m
2026-07-12 UAL134 - Jul 12, 22:25 UTCJul 13, 05:31 UTC7h 5m
2026-07-12 UAL273 NCE → EWR Jul 12, 10:40 UTCJul 12, 19:10 UTC8h 30m
2026-07-12 UAL272 EWR → NCE Jul 12, 00:50 UTCJul 12, 08:24 UTC7h 34m
2026-07-12 UAL272 - Jul 12, 00:55 UTCJul 12, 07:31 UTC6h 35m
2026-07-11 UAL957 - Jul 11, 07:40 UTCJul 11, 15:50 UTC8h 10m
2026-07-11 UAL957 GVA → EWR Jul 11, 07:47 UTCJul 11, 15:48 UTC8h 1m
2026-07-10 UAL956 - Jul 10, 22:50 UTCJul 11, 05:55 UTC7h 5m
2026-07-10 UAL147 LHR → EWR Jul 10, 11:30 UTCJul 10, 19:10 UTC7h 40m
2026-07-10 UAL920 ORD → LHR Jul 10, 01:27 UTCJul 10, 08:41 UTC7h 14m
2026-07-09 UAL959 LHR → ORD Jul 9, 10:20 UTCJul 9, 18:45 UTC8h 25m
2026-07-08 UAL16 - Jul 8, 22:05 UTCJul 9, 04:40 UTC6h 35m
2026-07-07 UAL921 - Jul 7, 17:30 UTCJul 8, 00:30 UTC7h 0m
2026-07-07 UAL938 - Jul 7, 05:30 UTCJul 7, 07:50 UTC2h 20m
2026-07-07 UAL938 ORD → LHR Jul 7, 05:32 UTCJul 7, 12:47 UTC7h 15m
2026-07-07 UAL3935 EWR → ORD Jul 7, 01:35 UTCJul 7, 03:20 UTC1h 45m
2026-07-06 UAL967 - Jul 6, 12:35 UTCJul 6, 22:00 UTC9h 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 N666UA page for operator, model, and routing details .

Mode-S A8CC46 frequently asked

What is Mode-S code A8CC46?
A8CC46 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N666UA.
Where is Mode-S A8CC46 registered?
Mode-S code A8CC46 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 A8CC46 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8CC46, octal 52146106, decimal 11,062,342.
What flights does A8CC46 operate?
Mode-S A8CC46 has broadcast 20 distinct callsigns, including UAL31, UAL957, UAL959, UAL938, UAL921.