Apparatus

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sensors Mode-S transponder

A8AC35

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N658UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A8AC35
Octal
52126065
Decimal
11,054,133
Country
US
Tail
N658UA
Type
B763
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
248
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A8AC35.

Country allocation

The ICAO 24-bit address A8AC35 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
UAL965 - 17 2026-07-06
UAL938 United Airlines 15 2026-07-26
UAL928 United Airlines 15 2026-07-25
UAL921 - 12 2026-07-13
UAL964 - 11 2026-07-05
UAL958 - 11 2026-07-15
UAL940 - 11 2026-06-18
UAL934 - 11 2026-07-14
UAL929 - 11 2026-07-18
UAL134 United Airlines 11 2026-07-20
UAL147 - 10 2026-07-19
UAL135 - 9 2026-07-02
UAL15 - 8 2026-06-25
UAL904 - 7 2026-06-15
UAL3 - 7 2026-07-16
UAL959 United Airlines 6 2026-07-18
UAL12 United Airlines 6 2026-07-21
UAL963 United Airlines 5 2026-07-20
UAL941 United Airlines 5 2026-07-26
UAL380 - 5 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL941 LHR → EWR Jul 26, 15:40 UTCJul 26, 21:15 UTC5h 35m
2026-07-26 UAL938 ORD → LHR Jul 26, 03:05 UTCJul 26, 05:40 UTC2h 35m
2026-07-26 UAL938 ORD → LHR Jul 26, 03:13 UTCJul 26, 10:26 UTC7h 13m
2026-07-25 UAL928 LHR → ORD Jul 25, 13:34 UTCJul 25, 21:12 UTC7h 38m
2026-07-25 UAL928 LHR → ORD Jul 25, 13:15 UTCJul 25, 21:30 UTC8h 15m
2026-07-25 UAL938 ORD → LHR Jul 25, 03:15 UTCJul 25, 10:35 UTC7h 20m
2026-07-25 UAL938 ORD → LHR Jul 25, 03:13 UTCJul 25, 10:31 UTC7h 18m
2026-07-24 UAL928 LHR → ORD Jul 24, 13:35 UTCJul 24, 21:50 UTC8h 15m
2026-07-24 UAL938 ORD → LHR Jul 24, 03:10 UTCJul 24, 10:25 UTC7h 15m
2026-07-21 UAL12 HNL → LAX Jul 21, 08:45 UTCJul 21, 17:55 UTC9h 10m
2026-07-20 UAL134 EWR → ZRH Jul 20, 22:35 UTCJul 21, 05:55 UTC7h 19m
2026-07-20 UAL963 BER → EWR Jul 20, 08:05 UTCJul 20, 16:35 UTC8h 30m
2026-07-20 UAL963 BER → EWR Jul 20, 08:11 UTCJul 20, 16:17 UTC8h 6m
2026-07-19 UAL962 EWR → BER Jul 19, 23:00 UTCJul 20, 06:20 UTC7h 20m
2026-07-19 UAL147 LHR → EWR Jul 19, 11:25 UTCJul 19, 19:28 UTC8h 3m
2026-07-19 UAL147 LHR → EWR Jul 19, 11:25 UTCJul 19, 19:40 UTC8h 15m
2026-07-18 UAL929 ORD → LHR Jul 18, 22:48 UTCJul 19, 06:06 UTC7h 18m
2026-07-18 UAL929 - Jul 18, 22:45 UTCJul 18, 23:55 UTC1h 10m
2026-07-18 UAL959 LHR → ORD Jul 18, 11:00 UTCJul 18, 18:55 UTC7h 55m
2026-07-18 UAL920 ORD → LHR Jul 18, 00:27 UTCJul 18, 07:42 UTC7h 15m
2026-07-18 UAL920 - Jul 18, 00:19 UTCJul 18, 02:45 UTC2h 25m
2026-07-17 UAL12 HNL → LAX Jul 17, 08:20 UTCJul 17, 17:20 UTC9h 0m
2026-07-16 UAL3 ORD → ZRH Jul 16, 21:45 UTCJul 17, 05:50 UTC8h 5m
2026-07-16 UAL12 ZRH → ORD Jul 16, 08:19 UTCJul 16, 17:13 UTC8h 54m
2026-07-16 UAL12 - Jul 16, 08:15 UTCJul 16, 10:20 UTC2h 5m
2026-07-15 UAL3 - Jul 15, 21:50 UTCJul 15, 23:00 UTC1h 10m
2026-07-15 UAL3 ORD → ZRH Jul 15, 21:52 UTCJul 16, 06:03 UTC8h 11m
2026-07-15 UAL958 - Jul 15, 07:25 UTCJul 15, 08:35 UTC1h 10m
2026-07-15 UAL958 LHR → ORD Jul 15, 07:19 UTCJul 15, 15:21 UTC8h 2m
2026-07-14 UAL934 EWR → LHR Jul 14, 12:45 UTCJul 14, 19:20 UTC6h 35m
2026-07-13 UAL921 - Jul 13, 21:30 UTCJul 14, 04:20 UTC6h 50m
2026-07-13 UAL921 LHR → EWR Jul 13, 21:04 UTCJul 14, 04:17 UTC7h 13m
2026-07-13 UAL934 EWR → LHR Jul 13, 12:40 UTCJul 13, 19:20 UTC6h 40m
2026-07-12 UAL921 - Jul 12, 17:55 UTCJul 12, 19:10 UTC1h 15m
2026-07-12 UAL921 LHR → EWR Jul 12, 17:22 UTCJul 13, 00:54 UTC7h 32m
2026-07-12 UAL921 LHR → EWR Jul 12, 17:22 UTCJul 13, 00:55 UTC7h 33m
2026-07-11 UAL929 ORD → LHR Jul 11, 22:03 UTCJul 12, 05:28 UTC7h 25m
2026-07-11 UAL929 ORD → LHR Jul 11, 22:01 UTCJul 12, 05:35 UTC7h 35m
2026-07-08 UAL12 ZRH → ORD Jul 8, 08:40 UTCJul 8, 17:45 UTC9h 5m
2026-07-07 UAL134 EWR → ZRH Jul 7, 23:02 UTCJul 8, 06:33 UTC7h 31m
2026-07-07 UAL134 EWR → ZRH Jul 7, 23:25 UTCJul 8, 06:35 UTC7h 10m
2026-07-07 UAL273 - Jul 7, 12:40 UTCJul 7, 13:15 UTC35m
2026-07-07 UAL273 NCE → EWR Jul 7, 11:58 UTCJul 7, 20:39 UTC8h 41m
2026-07-07 UAL273 NCE → EWR Jul 7, 11:58 UTCJul 7, 20:37 UTC8h 39m
2026-07-07 UAL272 - Jul 7, 02:20 UTCJul 7, 09:15 UTC6h 55m
2026-07-07 UAL272 EWR → NCE Jul 7, 00:20 UTCJul 7, 09:53 UTC9h 33m
2026-07-06 UAL965 - Jul 6, 08:30 UTCJul 6, 17:45 UTC9h 15m
2026-07-06 UAL965 NAP → EWR Jul 6, 08:09 UTCJul 6, 17:42 UTC9h 33m
2026-07-05 UAL964 - Jul 5, 20:40 UTCJul 6, 04:15 UTC7h 35m
2026-07-05 UAL965 - Jul 5, 08:40 UTCJul 5, 18:05 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 N658UA page for operator, model, and routing details .

Mode-S A8AC35 frequently asked

What is Mode-S code A8AC35?
A8AC35 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N658UA.
Where is Mode-S A8AC35 registered?
Mode-S code A8AC35 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 A8AC35 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8AC35, octal 52126065, decimal 11,054,133.
What flights does A8AC35 operate?
Mode-S A8AC35 has broadcast 20 distinct callsigns, including UAL965, UAL938, UAL928, UAL921, UAL964.