Apparatus

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sensors Mode-S transponder

A8A110

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N655UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A8A110
Octal
52120420
Decimal
11,051,280
Country
US
Tail
N655UA
Type
B763
No current signal · last broadcast 2d ago
Flights observed
145
Distinct callsigns
20
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A8A110.

Country allocation

The ICAO 24-bit address A8A110 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
UAL946 - 12 2026-07-07
UAL855 - 11 2026-06-29
UAL947 - 10 2026-07-07
UAL854 - 10 2026-06-23
UAL321 - 10 2026-07-05
UAL331 United Airlines 7 2026-05-20
UAL322 - 7 2026-07-06
UAL242 - 7 2026-06-21
UAL925 United Airlines 6 2026-05-21
UAL924 United Airlines 6 2026-05-21
UAL749 United Airlines 6 2026-06-06
UAL243 - 6 2026-06-22
UAL21 - 6 2026-07-08
UAL748 United Airlines 5 2026-06-05
UAL330 United Airlines 5 2026-05-20
UAL20 - 5 2026-06-29
UAL52 - 4 2026-07-03
UAL53 - 3 2026-07-04
UAL3903 United Airlines 3 2026-04-28
UAL129 - 3 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 UAL3909 GIG → IAH Jul 11, 00:02 UTCJul 11, 10:30 UTC10h 28m
2026-07-11 UAL3909 - Jul 11, 00:10 UTCJul 11, 10:30 UTC10h 20m
2026-07-09 UAL129 - Jul 9, 01:40 UTCJul 9, 11:00 UTC9h 20m
2026-07-08 UAL21 - Jul 8, 09:25 UTCJul 8, 19:30 UTC10h 5m
2026-07-07 UAL946 IAD → AMS Jul 7, 21:55 UTCJul 8, 05:15 UTC7h 20m
2026-07-07 UAL947 AMS → IAD Jul 7, 09:25 UTCJul 7, 17:40 UTC8h 15m
2026-07-06 UAL946 IAD → AMS Jul 6, 22:08 UTCJul 7, 06:32 UTC8h 24m
2026-07-06 UAL946 - Jul 6, 23:50 UTCJul 7, 06:45 UTC6h 55m
2026-07-06 UAL322 - Jul 6, 09:35 UTCJul 6, 18:50 UTC9h 15m
2026-07-05 UAL321 - Jul 5, 22:35 UTCJul 6, 06:10 UTC7h 35m
2026-07-05 UAL321 IAD → VCE Jul 5, 21:58 UTCJul 6, 06:08 UTC8h 10m
2026-07-04 UAL53 ZRH → IAD Jul 4, 10:20 UTCJul 4, 19:20 UTC9h 0m
2026-07-03 UAL52 IAD → ZRH Jul 3, 22:15 UTCJul 4, 05:55 UTC7h 40m
2026-07-03 UAL52 IAD → ZRH Jul 3, 22:03 UTCJul 4, 05:49 UTC7h 46m
2026-07-03 UAL322 - Jul 3, 08:25 UTCJul 3, 17:35 UTC9h 10m
2026-07-02 UAL321 IAD → VCE Jul 2, 22:10 UTCJul 3, 06:10 UTC8h 0m
2026-07-02 UAL322 - Jul 2, 08:00 UTCJul 2, 17:30 UTC9h 30m
2026-07-01 UAL321 IAD → VCE Jul 1, 21:40 UTCJul 2, 05:45 UTC8h 5m
2026-07-01 UAL322 - Jul 1, 08:00 UTCJul 1, 10:55 UTC2h 55m
2026-07-01 UAL322 VCE → IAD Jul 1, 08:04 UTCJul 1, 17:24 UTC9h 20m
2026-06-30 UAL321 - Jun 30, 21:35 UTCJul 1, 05:35 UTC8h 0m
2026-06-30 UAL321 IAD → VCE Jun 30, 21:38 UTCJul 1, 05:34 UTC7h 56m
2026-06-30 UAL321 IAD → IAD Jun 30, 21:25 UTCJun 30, 21:30 UTC5m
2026-06-30 UAL947 AMS → IAD Jun 30, 09:50 UTCJun 30, 17:35 UTC7h 45m
2026-06-29 UAL20 - Jun 29, 21:39 UTCJun 30, 06:55 UTC9h 16m
2026-06-29 UAL855 LIM → IAH Jun 29, 06:13 UTCJun 29, 12:16 UTC6h 3m
2026-06-28 UAL855 - Jun 28, 21:40 UTCJun 29, 12:20 UTC14h 40m
2026-06-24 UAL855 LIM → IAH Jun 24, 06:38 UTCJun 24, 12:53 UTC6h 15m
2026-06-23 UAL854 - Jun 23, 21:59 UTCJun 24, 00:20 UTC2h 20m
2026-06-23 UAL21 AMS → IAH Jun 23, 09:20 UTCJun 23, 19:19 UTC10h 0m
2026-06-22 UAL946 IAD → AMS Jun 22, 22:34 UTCJun 23, 05:39 UTC7h 5m
2026-06-22 UAL946 IAD → AMS Jun 22, 21:53 UTCJun 23, 05:26 UTC7h 33m
2026-06-22 UAL243 NCE → IAD Jun 22, 08:29 UTCJun 22, 17:25 UTC8h 55m
2026-06-21 UAL242 IAD → NCE Jun 21, 21:49 UTCJun 22, 05:29 UTC7h 40m
2026-06-21 UAL243 NCE → IAD Jun 21, 08:30 UTCJun 21, 17:50 UTC9h 20m
2026-06-20 UAL242 IAD → NCE Jun 20, 22:13 UTCJun 21, 05:47 UTC7h 34m
2026-06-20 UAL322 BOI → DEN Jun 20, 08:09 UTCJun 20, 17:19 UTC9h 10m
2026-06-19 UAL321 IAD → VCE Jun 19, 21:44 UTCJun 20, 05:29 UTC7h 45m
2026-06-19 UAL947 AMS → IAD Jun 19, 09:30 UTCJun 19, 17:44 UTC8h 15m
2026-06-18 UAL20 - Jun 18, 21:40 UTCJun 19, 06:49 UTC9h 9m
2026-06-18 UAL128 - Jun 18, 00:15 UTCJun 18, 10:00 UTC9h 45m
2026-06-17 UAL129 - Jun 17, 01:50 UTCJun 17, 11:10 UTC9h 20m
2026-06-16 UAL21 AMS → IAH Jun 16, 09:15 UTCJun 16, 19:45 UTC10h 30m
2026-06-15 UAL946 IAD → AMS Jun 15, 21:53 UTCJun 16, 04:54 UTC7h 1m
2026-06-15 UAL946 - Jun 15, 21:55 UTCJun 16, 04:00 UTC6h 5m
2026-06-15 UAL243 SFO → BOI Jun 15, 08:10 UTCJun 15, 17:04 UTC8h 55m
2026-06-14 UAL242 PDX → SFO Jun 14, 22:00 UTCJun 15, 05:30 UTC7h 29m
2026-06-14 UAL243 SFO → BOI Jun 14, 08:15 UTCJun 14, 16:50 UTC8h 35m
2026-06-13 UAL242 PDX → SFO Jun 13, 21:48 UTCJun 14, 05:33 UTC7h 45m
2026-06-13 UAL242 PDX → SFO Jun 13, 21:50 UTCJun 14, 05:40 UTC7h 51m

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 N655UA page for operator, model, and routing details .

Mode-S A8A110 frequently asked

What is Mode-S code A8A110?
A8A110 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N655UA.
Where is Mode-S A8A110 registered?
Mode-S code A8A110 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 A8A110 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 A8A110, octal 52120420, decimal 11,051,280.
What flights does A8A110 operate?
Mode-S A8A110 has broadcast 20 distinct callsigns, including UAL946, UAL855, UAL947, UAL854, UAL321.