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
Broadcasting now · callsign UAL934 · 37,000 ft
Flights observed
219
Distinct callsigns
20
Country
US
Last broadcast
59m ago

Current position

A8AC35 is currently broadcasting. Map zoomed to live position.

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
UAL928 United Airlines 12 2026-06-24
UAL921 - 12 2026-07-13
UAL964 - 11 2026-07-05
UAL940 - 11 2026-06-18
UAL934 - 11 2026-07-14
UAL938 - 10 2026-06-25
UAL134 - 10 2026-07-07
UAL958 - 9 2026-06-21
UAL929 - 9 2026-07-11
UAL135 - 9 2026-07-02
UAL15 - 8 2026-06-25
UAL147 United Airlines 8 2026-05-30
UAL904 - 7 2026-06-15
UAL959 - 5 2026-06-29
UAL380 - 5 2026-07-03
UAL17 - 5 2026-07-01
UAL941 - 4 2026-06-19
UAL381 - 4 2026-07-04
UAL3 United Airlines 4 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL934 - Jul 14, 12:45 UTCJul 14, 13:15 UTC30m
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
2026-07-04 UAL964 - Jul 4, 20:40 UTCJul 5, 04:35 UTC7h 55m
2026-07-04 UAL381 - Jul 4, 07:50 UTCJul 4, 17:25 UTC9h 35m
2026-07-03 UAL380 - Jul 3, 21:05 UTCJul 3, 22:50 UTC1h 45m
2026-07-03 UAL380 EWR → BRI Jul 3, 20:58 UTCJul 4, 05:22 UTC8h 24m
2026-07-02 UAL135 ZRH → EWR Jul 2, 08:30 UTCJul 2, 17:10 UTC8h 40m
2026-07-01 UAL134 - Jul 1, 22:55 UTCJul 2, 06:00 UTC7h 5m
2026-07-01 UAL134 EWR → ZRH Jul 1, 22:39 UTCJul 2, 06:04 UTC7h 25m
2026-07-01 UAL17 - Jul 1, 09:55 UTCJul 1, 17:25 UTC7h 30m
2026-06-30 UAL929 - Jun 30, 23:40 UTCJul 1, 06:45 UTC7h 5m
2026-06-29 UAL959 - Jun 29, 11:39 UTCJun 29, 12:55 UTC1h 15m
2026-06-29 UAL959 LHR → ORD Jun 29, 11:40 UTCJun 29, 19:47 UTC8h 7m
2026-06-29 UAL146 EWR → LHR Jun 29, 03:16 UTCJun 29, 09:25 UTC6h 9m
2026-06-29 UAL146 - Jun 29, 03:05 UTCJun 29, 09:29 UTC6h 25m
2026-06-28 UAL921 LHR → EWR Jun 28, 17:30 UTCJun 29, 00:49 UTC7h 20m
2026-06-27 UAL16 EWR → LHR Jun 27, 22:09 UTCJun 28, 04:20 UTC6h 10m
2026-06-26 UAL967 - Jun 26, 20:20 UTCJun 26, 21:50 UTC1h 30m
2026-06-26 UAL967 - Jun 26, 20:00 UTCJun 26, 20:15 UTC15m
2026-06-26 UAL967 - Jun 26, 12:44 UTCJun 26, 15:49 UTC3h 5m
2026-06-26 UAL966 - Jun 26, 01:10 UTCJun 26, 09:20 UTC8h 10m
2026-06-25 UAL15 - Jun 25, 14:55 UTCJun 25, 16:09 UTC1h 15m
2026-06-25 UAL15 LHR → EWR Jun 25, 14:44 UTCJun 25, 22:33 UTC7h 49m
2026-06-25 UAL938 ORD → LHR Jun 25, 04:13 UTCJun 25, 12:43 UTC8h 30m
2026-06-25 UAL938 ORD → LHR Jun 25, 05:15 UTCJun 25, 12:25 UTC7h 10m
2026-06-24 UAL928 LHR → ORD Jun 24, 13:50 UTCJun 24, 21:50 UTC8h 0m
2026-06-24 UAL938 ORD → LHR Jun 24, 03:13 UTCJun 24, 10:20 UTC7h 7m
2026-06-24 UAL938 ORD → LHR Jun 24, 03:04 UTCJun 24, 10:25 UTC7h 20m
2026-06-23 UAL928 LHR → ORD Jun 23, 21:29 UTCJun 23, 21:34 UTC5m
2026-06-23 UAL928 LHR → ORD Jun 23, 13:24 UTCJun 23, 14:29 UTC1h 5m
2026-06-23 UAL928 LHR → ORD Jun 23, 13:34 UTCJun 23, 21:04 UTC7h 30m

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?
Yes. Mode-S A8AC35 is currently airborne.
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, UAL928, UAL921, UAL964, UAL940.