Apparatus

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sensors Mode-S transponder

A8886D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N649UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A8886D
Octal
52104155
Decimal
11,044,973
Country
US
Tail
N649UA
Type
B763
No current signal · last broadcast 4d ago
Flights observed
88
Distinct callsigns
18
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S A8886D.

Country allocation

The ICAO 24-bit address A8886D 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 18 distinct

Callsign Airline Flights Last seen
UAL947 - 10 2026-07-18
UAL52 United Airlines 9 2026-07-19
UAL946 United Airlines 8 2026-07-25
UAL53 United Airlines 8 2026-07-20
UAL21 United Airlines 8 2026-07-26
UAL128 - 8 2026-07-17
UAL20 - 7 2026-07-17
UAL129 - 5 2026-07-16
UAL243 - 4 2026-07-19
UAL126 - 4 2026-06-22
UAL321 United Airlines 3 2026-07-24
UAL242 United Airlines 3 2026-07-18
UAL127 - 3 2026-06-22
UAL854 - 2 2026-07-12
UAL4205 United Airlines 2 2026-06-04
UAL322 United Airlines 2 2026-07-25
UAL855 - 1 2026-07-13
UAL3915 - 1 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL21 AMS → IAH Jul 26, 09:45 UTCJul 26, 19:55 UTC10h 10m
2026-07-25 UAL946 IAD → AMS Jul 25, 22:00 UTCJul 26, 05:10 UTC7h 10m
2026-07-25 UAL322 BOI → DEN Jul 25, 08:25 UTCJul 25, 17:20 UTC8h 55m
2026-07-24 UAL321 ATL → EWR Jul 24, 22:00 UTCJul 25, 05:45 UTC7h 45m
2026-07-20 UAL53 ZRH → IAD Jul 20, 12:39 UTCJul 20, 20:42 UTC8h 3m
2026-07-20 UAL53 ZRH → IAD Jul 20, 12:30 UTCJul 20, 20:40 UTC8h 10m
2026-07-19 UAL52 IAD → ZRH Jul 19, 23:40 UTCJul 20, 07:20 UTC7h 40m
2026-07-19 UAL243 - Jul 19, 08:30 UTCJul 19, 17:25 UTC8h 55m
2026-07-18 UAL242 PDX → SFO Jul 18, 22:35 UTCJul 19, 06:30 UTC7h 55m
2026-07-18 UAL947 - Jul 18, 09:30 UTCJul 18, 18:05 UTC8h 35m
2026-07-18 UAL947 AMS → IAD Jul 18, 09:35 UTCJul 18, 17:59 UTC8h 24m
2026-07-17 UAL20 - Jul 17, 21:34 UTCJul 18, 06:50 UTC9h 16m
2026-07-17 UAL20 IAH → AMS Jul 17, 21:47 UTCJul 18, 06:37 UTC8h 50m
2026-07-17 UAL128 GIG → IAH Jul 17, 01:15 UTCJul 17, 10:15 UTC9h 0m
2026-07-17 UAL128 - Jul 17, 00:14 UTCJul 17, 00:30 UTC15m
2026-07-17 UAL128 GIG → IAH Jul 17, 00:26 UTCJul 17, 10:12 UTC9h 46m
2026-07-16 UAL129 - Jul 16, 01:20 UTCJul 16, 10:59 UTC9h 40m
2026-07-13 UAL855 - Jul 13, 06:20 UTCJul 13, 12:10 UTC5h 50m
2026-07-12 UAL854 - Jul 12, 21:35 UTCJul 13, 03:25 UTC5h 50m
2026-07-12 UAL854 IAH → LIM Jul 12, 21:42 UTCJul 13, 03:44 UTC6h 2m
2026-07-11 UAL21 - Jul 11, 21:20 UTCJul 11, 22:05 UTC45m
2026-07-11 UAL21 - Jul 11, 09:30 UTCJul 11, 20:05 UTC10h 35m
2026-07-10 UAL946 IAD → AMS Jul 10, 22:23 UTCJul 11, 05:18 UTC6h 55m
2026-07-10 UAL946 IAD → AMS Jul 10, 22:35 UTCJul 11, 05:31 UTC6h 55m
2026-07-10 UAL243 RDG → IAD Jul 10, 18:15 UTCJul 10, 18:45 UTC30m
2026-07-10 UAL243 - Jul 10, 09:50 UTCJul 10, 18:10 UTC8h 20m
2026-07-09 UAL242 IAD → NCE Jul 9, 23:20 UTCJul 10, 07:25 UTC8h 5m
2026-07-09 UAL53 ZRH → IAD Jul 9, 10:15 UTCJul 9, 19:25 UTC9h 10m
2026-07-08 UAL52 - Jul 8, 22:25 UTCJul 9, 05:15 UTC6h 50m
2026-07-08 UAL52 IAD → ZRH Jul 8, 22:03 UTCJul 9, 05:57 UTC7h 54m
2026-07-08 UAL3915 - Jul 8, 10:35 UTCJul 8, 19:40 UTC9h 5m
2026-07-06 UAL321 - Jul 6, 23:15 UTCJul 7, 07:05 UTC7h 50m
2026-07-05 UAL243 NCE → IAD Jul 5, 08:30 UTCJul 5, 17:15 UTC8h 45m
2026-07-04 UAL242 IAD → NCE Jul 4, 21:50 UTCJul 5, 05:20 UTC7h 30m
2026-07-04 UAL947 - Jul 4, 09:30 UTCJul 4, 10:55 UTC1h 25m
2026-07-04 UAL947 AMS → IAD Jul 4, 09:35 UTCJul 4, 17:46 UTC8h 11m
2026-07-04 UAL947 AMS → IAD Jul 4, 09:35 UTCJul 4, 17:35 UTC8h 0m
2026-07-03 UAL946 - Jul 3, 22:55 UTCJul 4, 05:35 UTC6h 40m
2026-07-03 UAL946 IAD → IAD Jul 3, 22:40 UTCJul 3, 22:45 UTC5m
2026-07-03 UAL947 - Jul 3, 10:10 UTCJul 3, 18:20 UTC8h 10m
2026-07-03 UAL947 AMS → IAD Jul 3, 09:37 UTCJul 3, 18:18 UTC8h 41m
2026-07-02 UAL20 - Jul 2, 22:20 UTCJul 3, 07:00 UTC8h 40m
2026-07-02 UAL20 IAH → AMS Jul 2, 22:07 UTCJul 3, 06:49 UTC8h 42m
2026-06-28 UAL128 - Jun 28, 08:09 UTCJun 28, 11:04 UTC2h 55m
2026-06-28 UAL128 - Jun 28, 01:25 UTCJun 28, 01:34 UTC10m
2026-06-27 UAL129 - Jun 27, 13:20 UTCJun 27, 14:29 UTC1h 10m
2026-06-27 UAL129 - Jun 27, 01:35 UTCJun 27, 11:30 UTC9h 55m
2026-06-26 UAL21 AMS → IAH Jun 26, 17:50 UTCJun 26, 19:39 UTC1h 50m
2026-06-26 UAL21 AMS → IAH Jun 26, 09:35 UTCJun 26, 17:44 UTC8h 10m
2026-06-25 UAL946 - Jun 25, 21:55 UTCJun 26, 04:59 UTC7h 5m

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 N649UA page for operator, model, and routing details .

Mode-S A8886D frequently asked

What is Mode-S code A8886D?
A8886D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N649UA.
Where is Mode-S A8886D registered?
Mode-S code A8886D 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 A8886D broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8886D, octal 52104155, decimal 11,044,973.
What flights does A8886D operate?
Mode-S A8886D has broadcast 18 distinct callsigns, including UAL947, UAL52, UAL946, UAL53, UAL21.