Apparatus

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sensors Mode-S transponder

A8DD7B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N670UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A8DD7B
Octal
52156573
Decimal
11,066,747
Country
US
Tail
N670UA
Type
B763
No current signal · last broadcast 2h ago
Flights observed
238
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A8DD7B.

Country allocation

The ICAO 24-bit address A8DD7B 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
UAL920 United Airlines 14 2026-07-05
UAL928 United Airlines 13 2026-07-03
UAL967 - 11 2026-07-13
UAL273 United Airlines 10 2026-05-30
UAL966 - 9 2026-07-13
UAL934 United Airlines 9 2026-07-01
UAL963 - 8 2026-06-27
UAL962 United Airlines 8 2026-06-26
UAL957 United Airlines 8 2026-05-29
UAL31 - 8 2026-06-25
UAL956 United Airlines 7 2026-05-28
UAL272 United Airlines 7 2026-05-30
UAL135 - 7 2026-06-23
UAL941 - 6 2026-06-17
UAL938 - 6 2026-06-13
UAL921 - 6 2026-07-02
UAL908 United Airlines 6 2026-04-15
UAL904 - 6 2026-07-14
UAL15 United Airlines 6 2026-06-03
UAL12 United Airlines 6 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL904 - Jul 14, 00:05 UTCJul 14, 06:55 UTC6h 50m
2026-07-13 UAL967 - Jul 13, 12:20 UTCJul 13, 21:30 UTC9h 10m
2026-07-13 UAL966 - Jul 13, 01:20 UTCJul 13, 09:35 UTC8h 15m
2026-07-12 UAL967 - Jul 12, 12:25 UTCJul 12, 21:35 UTC9h 10m
2026-07-12 UAL966 - Jul 12, 01:40 UTCJul 12, 09:55 UTC8h 15m
2026-07-11 UAL967 - Jul 11, 12:30 UTCJul 11, 22:05 UTC9h 35m
2026-07-11 UAL967 NAP → EWR Jul 11, 12:24 UTCJul 11, 22:05 UTC9h 41m
2026-07-11 UAL966 - Jul 11, 01:45 UTCJul 11, 02:45 UTC1h 0m
2026-07-11 UAL966 EWR → NAP Jul 11, 01:21 UTCJul 11, 09:57 UTC8h 36m
2026-07-05 UAL147 - Jul 5, 11:10 UTCJul 5, 18:30 UTC7h 20m
2026-07-05 UAL920 ORD → LHR Jul 5, 00:27 UTCJul 5, 07:26 UTC6h 59m
2026-07-05 UAL920 ORD → LHR Jul 5, 00:00 UTCJul 5, 07:35 UTC7h 35m
2026-07-03 UAL928 LHR → ORD Jul 3, 13:35 UTCJul 3, 22:10 UTC8h 35m
2026-07-03 UAL928 LHR → ORD Jul 3, 13:44 UTCJul 3, 21:57 UTC8h 13m
2026-07-03 UAL146 EWR → LHR Jul 3, 03:35 UTCJul 3, 09:55 UTC6h 20m
2026-07-02 UAL921 - Jul 2, 17:30 UTCJul 3, 01:20 UTC7h 50m
2026-07-02 UAL921 LHR → EWR Jul 2, 17:22 UTCJul 3, 01:16 UTC7h 54m
2026-07-01 UAL934 EWR → LHR Jul 1, 12:57 UTCJul 1, 19:16 UTC6h 19m
2026-07-01 UAL934 EWR → LHR Jul 1, 12:50 UTCJul 1, 19:15 UTC6h 25m
2026-06-30 UAL967 - Jun 30, 12:30 UTCJun 30, 12:45 UTC15m
2026-06-30 UAL967 NAP → EWR Jun 30, 12:24 UTCJun 30, 21:50 UTC9h 26m
2026-06-30 UAL967 NAP → EWR Jun 30, 12:24 UTCJun 30, 21:37 UTC9h 13m
2026-06-30 UAL966 - Jun 30, 01:04 UTCJun 30, 09:00 UTC7h 56m
2026-06-29 UAL967 - Jun 29, 12:20 UTCJun 29, 15:45 UTC3h 25m
2026-06-29 UAL967 NAP → EWR Jun 29, 12:24 UTCJun 29, 21:37 UTC9h 13m
2026-06-29 UAL966 - Jun 29, 01:05 UTCJun 29, 08:50 UTC7h 45m
2026-06-28 UAL965 - Jun 28, 08:25 UTCJun 28, 17:34 UTC9h 10m
2026-06-27 UAL964 - Jun 27, 20:24 UTCJun 28, 04:15 UTC7h 50m
2026-06-27 UAL963 BER → EWR Jun 27, 08:05 UTCJun 27, 16:20 UTC8h 15m
2026-06-26 UAL962 EWR → BER Jun 26, 21:35 UTCJun 27, 04:49 UTC7h 15m
2026-06-26 UAL963 - Jun 26, 08:40 UTCJun 26, 16:44 UTC8h 5m
2026-06-26 UAL963 BER → EWR Jun 26, 08:31 UTCJun 26, 17:03 UTC8h 32m
2026-06-25 UAL962 EWR → BER Jun 25, 23:34 UTCJun 26, 06:35 UTC7h 0m
2026-06-25 UAL31 - Jun 25, 08:40 UTCJun 25, 08:45 UTC5m
2026-06-25 UAL31 MUC → EWR Jun 25, 08:12 UTCJun 25, 17:17 UTC9h 5m
2026-06-25 UAL31 MUC → EWR Jun 25, 08:12 UTCJun 25, 17:17 UTC9h 5m
2026-06-24 UAL30 EWR → MUC Jun 24, 21:44 UTCJun 25, 05:09 UTC7h 25m
2026-06-24 UAL31 MUC → EWR Jun 24, 08:30 UTCJun 24, 17:20 UTC8h 50m
2026-06-24 UAL31 MUC → EWR Jun 24, 08:12 UTCJun 24, 17:20 UTC9h 8m
2026-06-23 UAL30 EWR → MUC Jun 23, 21:23 UTCJun 24, 06:05 UTC8h 42m
2026-06-23 UAL30 EWR → MUC Jun 23, 22:49 UTCJun 24, 06:04 UTC7h 15m
2026-06-23 UAL135 - Jun 23, 08:39 UTCJun 23, 08:45 UTC5m
2026-06-23 UAL135 ZRH → EWR Jun 23, 08:30 UTCJun 23, 17:33 UTC9h 3m
2026-06-22 UAL3 LAX → HNL Jun 22, 21:25 UTCJun 23, 05:24 UTC8h 0m
2026-06-22 UAL958 - Jun 22, 07:14 UTCJun 22, 15:24 UTC8h 10m
2026-06-21 UAL934 EWR → LHR Jun 21, 13:00 UTCJun 21, 19:34 UTC6h 35m
2026-06-20 UAL921 LHR → EWR Jun 20, 17:22 UTCJun 21, 00:37 UTC7h 15m
2026-06-19 UAL16 EWR → LHR Jun 19, 21:49 UTCJun 20, 04:09 UTC6h 20m
2026-06-19 UAL963 - Jun 19, 09:30 UTCJun 19, 17:55 UTC8h 25m
2026-06-19 UAL963 BER → EWR Jun 19, 09:36 UTCJun 19, 17:52 UTC8h 16m

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 N670UA page for operator, model, and routing details .

Mode-S A8DD7B frequently asked

What is Mode-S code A8DD7B?
A8DD7B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N670UA.
Where is Mode-S A8DD7B registered?
Mode-S code A8DD7B 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 A8DD7B broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8DD7B, octal 52156573, decimal 11,066,747.
What flights does A8DD7B operate?
Mode-S A8DD7B has broadcast 20 distinct callsigns, including UAL920, UAL928, UAL967, UAL273, UAL966.