Apparatus

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sensors Mode-S transponder

A8D76B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N669UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A8D76B
Octal
52153553
Decimal
11,065,195
Country
US
Tail
N669UA
Type
B763
No current signal · last broadcast Jul 26, 19:10 UTC
Flights observed
232
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:10 UTC

Last known position

Most recent position reported by Mode-S A8D76B.

Country allocation

The ICAO 24-bit address A8D76B 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
UAL929 - 14 2026-07-16
UAL921 United Airlines 13 2026-07-24
UAL12 - 12 2026-06-29
UAL146 United Airlines 10 2026-07-25
UAL3 United Airlines 9 2026-06-28
UAL958 - 8 2026-07-16
UAL934 - 8 2026-07-15
UAL381 - 8 2026-07-21
UAL16 - 8 2026-06-24
UAL15 United Airlines 8 2026-07-25
UAL134 - 8 2026-07-09
UAL967 - 7 2026-07-14
UAL966 - 6 2026-07-14
UAL964 United Airlines 6 2026-07-19
UAL928 United Airlines 6 2026-05-26
UAL31 - 6 2026-07-23
UAL17 - 6 2026-07-17
UAL147 - 6 2026-06-16
UAL965 - 5 2026-07-20
UAL941 United Airlines 5 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL273 EWR → BOS Jul 26, 10:35 UTCJul 26, 19:05 UTC8h 30m
2026-07-26 UAL272 EWR → NCE Jul 26, 00:25 UTCJul 26, 07:40 UTC7h 16m
2026-07-25 UAL15 LHR → EWR Jul 25, 14:44 UTCJul 25, 21:57 UTC7h 13m
2026-07-25 UAL15 LHR → EWR Jul 25, 14:44 UTCJul 25, 21:57 UTC7h 13m
2026-07-25 UAL15 LHR → EWR Jul 25, 14:45 UTCJul 25, 15:55 UTC1h 10m
2026-07-25 UAL146 EWR → LHR Jul 25, 02:35 UTCJul 25, 09:15 UTC6h 40m
2026-07-24 UAL921 LHR → EWR Jul 24, 17:25 UTCJul 24, 18:30 UTC1h 5m
2026-07-24 UAL921 LHR → EWR Jul 24, 17:22 UTCJul 25, 00:35 UTC7h 13m
2026-07-24 UAL921 LHR → EWR Jul 24, 17:22 UTCJul 25, 00:34 UTC7h 12m
2026-07-24 UAL904 EWR → LHR Jul 24, 00:10 UTCJul 24, 06:45 UTC6h 35m
2026-07-23 UAL31 - Jul 23, 11:35 UTCJul 23, 12:45 UTC1h 10m
2026-07-23 UAL31 MUC → EWR Jul 23, 11:17 UTCJul 23, 19:44 UTC8h 27m
2026-07-23 UAL30 EWR → MUC Jul 23, 02:05 UTCJul 23, 09:40 UTC7h 35m
2026-07-22 UAL957 GVA → EWR Jul 22, 08:57 UTCJul 22, 17:08 UTC8h 11m
2026-07-21 UAL956 EWR → GVA Jul 21, 23:35 UTCJul 22, 16:45 UTC17h 10m
2026-07-21 UAL381 BRI → EWR Jul 21, 08:03 UTCJul 21, 17:26 UTC9h 23m
2026-07-21 UAL381 - Jul 21, 07:55 UTCJul 21, 08:45 UTC50m
2026-07-20 UAL380 - Jul 20, 21:20 UTCJul 21, 05:50 UTC8h 29m
2026-07-20 UAL965 - Jul 20, 08:15 UTCJul 20, 17:50 UTC9h 35m
2026-07-19 UAL964 EWR → NAP Jul 19, 20:40 UTCJul 20, 04:40 UTC8h 0m
2026-07-18 UAL31 - Jul 18, 17:05 UTCJul 18, 17:25 UTC20m
2026-07-18 UAL31 - Jul 18, 08:15 UTCJul 18, 10:40 UTC2h 25m
2026-07-18 UAL31 MUC → EWR Jul 18, 08:07 UTCJul 18, 16:50 UTC8h 43m
2026-07-17 UAL30 EWR → MUC Jul 17, 22:10 UTCJul 18, 05:45 UTC7h 36m
2026-07-17 UAL17 LHR → EWR Jul 17, 09:45 UTCJul 17, 17:25 UTC7h 40m
2026-07-16 UAL929 ORD → LHR Jul 16, 22:45 UTCJul 17, 06:25 UTC7h 40m
2026-07-16 UAL958 LHR → ORD Jul 16, 07:19 UTCJul 16, 15:28 UTC8h 9m
2026-07-16 UAL958 LHR → ORD Jul 16, 07:19 UTCJul 16, 15:27 UTC8h 8m
2026-07-15 UAL934 EWR → LHR Jul 15, 13:57 UTCJul 15, 20:25 UTC6h 28m
2026-07-15 UAL934 EWR → LHR Jul 15, 14:00 UTCJul 15, 20:35 UTC6h 35m
2026-07-14 UAL967 - Jul 14, 12:40 UTCJul 14, 21:45 UTC9h 5m
2026-07-14 UAL966 - Jul 14, 01:10 UTCJul 14, 09:20 UTC8h 10m
2026-07-13 UAL15 - Jul 13, 15:25 UTCJul 13, 22:25 UTC7h 0m
2026-07-13 UAL15 LHR → EWR Jul 13, 14:44 UTCJul 13, 22:20 UTC7h 36m
2026-07-13 UAL146 EWR → LHR Jul 13, 02:35 UTCJul 13, 09:15 UTC6h 40m
2026-07-12 UAL381 - Jul 12, 07:10 UTCJul 12, 16:30 UTC9h 20m
2026-07-12 UAL381 BRI → EWR Jul 12, 07:18 UTCJul 12, 16:30 UTC9h 12m
2026-07-11 UAL380 - Jul 11, 19:50 UTCJul 12, 04:10 UTC8h 20m
2026-07-10 UAL135 ZRH → EWR Jul 10, 08:40 UTCJul 10, 17:20 UTC8h 40m
2026-07-09 UAL134 EWR → ZRH Jul 9, 22:39 UTCJul 10, 06:50 UTC8h 11m
2026-07-09 UAL134 - Jul 9, 23:40 UTCJul 10, 04:45 UTC5h 5m
2026-07-09 UAL135 - Jul 9, 10:30 UTCJul 9, 18:45 UTC8h 15m
2026-07-09 UAL135 ZRH → EWR Jul 9, 10:07 UTCJul 9, 18:42 UTC8h 35m
2026-07-09 UAL134 - Jul 9, 00:45 UTCJul 9, 08:00 UTC7h 15m
2026-07-07 UAL17 - Jul 7, 10:00 UTCJul 7, 11:10 UTC1h 10m
2026-07-07 UAL17 LHR → EWR Jul 7, 09:50 UTCJul 7, 17:14 UTC7h 24m
2026-07-07 UAL920 ORD → LHR Jul 7, 00:07 UTCJul 7, 07:27 UTC7h 20m
2026-07-07 UAL920 ORD → LHR Jul 7, 00:00 UTCJul 7, 07:30 UTC7h 30m
2026-07-06 UAL958 - Jul 6, 07:50 UTCJul 6, 15:55 UTC8h 5m
2026-07-06 UAL929 - Jul 6, 05:25 UTCJul 6, 05:40 UTC15m

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 N669UA page for operator, model, and routing details .

Mode-S A8D76B frequently asked

What is Mode-S code A8D76B?
A8D76B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N669UA.
Where is Mode-S A8D76B registered?
Mode-S code A8D76B 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 A8D76B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8D76B, octal 52153553, decimal 11,065,195.
What flights does A8D76B operate?
Mode-S A8D76B has broadcast 20 distinct callsigns, including UAL929, UAL921, UAL12, UAL146, UAL3.