Apparatus

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sensors Mode-S transponder

A884B6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N648UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A884B6
Octal
52102266
Decimal
11,044,022
Country
US
Tail
N648UA
Type
B763
Broadcasting now · callsign UAL946 · 37,000 ft
Flights observed
194
Distinct callsigns
20
Country
US
Last broadcast
9d ago

Current position

A884B6 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A884B6 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
UAL52 United Airlines 20 2026-07-24
UAL53 United Airlines 18 2026-07-25
UAL855 - 17 2026-07-20
UAL854 United Airlines 16 2026-07-19
UAL947 United Airlines 12 2026-07-21
UAL129 - 12 2026-07-13
UAL331 United Airlines 10 2026-07-26
UAL330 United Airlines 10 2026-07-26
UAL128 - 10 2026-06-29
UAL946 - 9 2026-07-17
UAL20 United Airlines 9 2026-07-20
UAL21 - 8 2026-07-17
UAL748 - 5 2026-07-01
UAL992 United Airlines 4 2026-05-06
UAL925 United Airlines 4 2026-05-20
UAL749 - 4 2026-07-02
UAL861 United Airlines 3 2026-05-21
UAL860 United Airlines 3 2026-05-22
UAL127 United Airlines 3 2026-06-07
UAL126 United Airlines 3 2026-06-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL331 CDG → IAD Jul 26, 15:30 UTCJul 26, 21:30 UTC6h 0m
2026-07-26 UAL330 SFO → LAX Jul 26, 03:10 UTCJul 26, 10:25 UTC7h 16m
2026-07-25 UAL53 ZRH → IAD Jul 25, 10:20 UTCJul 25, 19:00 UTC8h 40m
2026-07-24 UAL52 IAD → ZRH Jul 24, 22:30 UTCJul 25, 05:30 UTC7h 0m
2026-07-24 UAL52 IAD → ZRH Jul 24, 22:03 UTCJul 25, 06:02 UTC7h 59m
2026-07-24 UAL53 ZRH → IAD Jul 24, 10:15 UTCJul 24, 18:45 UTC8h 30m
2026-07-24 UAL52 IAD → ZRH Jul 24, 04:50 UTCJul 24, 05:50 UTC1h 0m
2026-07-23 UAL52 IAD → ZRH Jul 23, 22:25 UTCJul 24, 04:45 UTC6h 20m
2026-07-23 UAL52 IAD → ZRH Jul 23, 22:03 UTCJul 24, 05:46 UTC7h 43m
2026-07-23 UAL53 ZRH → IAD Jul 23, 10:15 UTCJul 23, 19:10 UTC8h 55m
2026-07-23 UAL53 ZRH → IAD Jul 23, 10:14 UTCJul 23, 19:04 UTC8h 50m
2026-07-22 UAL52 IAD → ZRH Jul 22, 22:05 UTCJul 22, 23:30 UTC1h 25m
2026-07-22 UAL52 IAD → ZRH Jul 22, 22:03 UTCJul 23, 05:52 UTC7h 49m
2026-07-22 UAL53 ZRH → IAD Jul 22, 11:10 UTCJul 22, 18:55 UTC7h 45m
2026-07-21 UAL52 IAD → ZRH Jul 21, 23:00 UTCJul 22, 05:25 UTC6h 25m
2026-07-21 UAL52 IAD → ZRH Jul 21, 22:03 UTCJul 22, 06:42 UTC8h 39m
2026-07-21 UAL947 AMS → IAD Jul 21, 09:45 UTCJul 21, 18:10 UTC8h 25m
2026-07-20 UAL20 IAH → AMS Jul 20, 21:35 UTCJul 21, 06:55 UTC9h 20m
2026-07-20 UAL855 - Jul 20, 06:25 UTCJul 20, 12:20 UTC5h 55m
2026-07-20 UAL855 LIM → IAH Jul 20, 06:13 UTCJul 20, 12:19 UTC6h 6m
2026-07-19 UAL854 IAH → LIM Jul 19, 22:05 UTCJul 20, 03:45 UTC5h 40m
2026-07-17 UAL21 - Jul 17, 10:15 UTCJul 17, 11:30 UTC1h 15m
2026-07-17 UAL21 AMS → IAH Jul 17, 10:12 UTCJul 17, 20:00 UTC9h 48m
2026-07-17 UAL946 IAD → AMS Jul 17, 00:53 UTCJul 17, 07:34 UTC6h 41m
2026-07-17 UAL946 - Jul 17, 00:40 UTCJul 17, 02:34 UTC1h 55m
2026-07-16 UAL947 - Jul 16, 09:35 UTCJul 16, 17:35 UTC8h 0m
2026-07-16 UAL947 AMS → AMS Jul 16, 09:20 UTCJul 16, 09:25 UTC5m
2026-07-15 UAL20 - Jul 15, 21:50 UTCJul 16, 07:05 UTC9h 15m
2026-07-15 UAL3038 - Jul 15, 02:15 UTCJul 15, 12:15 UTC10h 0m
2026-07-13 UAL129 - Jul 13, 02:45 UTCJul 13, 12:30 UTC9h 45m
2026-07-13 UAL129 IAH → GIG Jul 13, 02:51 UTCJul 13, 12:26 UTC9h 35m
2026-07-12 UAL21 - Jul 12, 09:25 UTCJul 12, 19:25 UTC10h 0m
2026-07-11 UAL946 IAD → AMS Jul 11, 22:10 UTCJul 12, 05:15 UTC7h 5m
2026-07-10 UAL331 - Jul 10, 15:20 UTCJul 10, 23:55 UTC8h 35m
2026-07-10 UAL330 IAD → CDG Jul 10, 03:15 UTCJul 10, 10:20 UTC7h 5m
2026-07-09 UAL331 - Jul 9, 15:20 UTCJul 9, 23:45 UTC8h 25m
2026-07-09 UAL331 CDG → IAD Jul 9, 15:24 UTCJul 9, 23:43 UTC8h 19m
2026-07-09 UAL330 IAD → CDG Jul 9, 02:58 UTCJul 9, 10:23 UTC7h 25m
2026-07-09 UAL330 - Jul 9, 03:00 UTCJul 9, 10:25 UTC7h 25m
2026-07-08 UAL331 - Jul 8, 15:25 UTCJul 8, 23:15 UTC7h 50m
2026-07-08 UAL330 IAD → CDG Jul 8, 03:10 UTCJul 8, 10:35 UTC7h 25m
2026-07-07 UAL331 - Jul 7, 15:15 UTCJul 7, 23:05 UTC7h 50m
2026-07-07 UAL330 IAD → CDG Jul 7, 06:00 UTCJul 7, 13:05 UTC7h 5m
2026-07-03 UAL331 - Jul 3, 15:25 UTCJul 3, 23:50 UTC8h 25m
2026-07-03 UAL330 IAD → CDG Jul 3, 03:40 UTCJul 3, 10:40 UTC7h 0m
2026-07-03 UAL330 IAD → CDG Jul 3, 03:28 UTCJul 3, 10:36 UTC7h 8m
2026-07-02 UAL749 - Jul 2, 09:20 UTCJul 2, 18:05 UTC8h 45m
2026-07-01 UAL748 IAD → GVA Jul 1, 22:03 UTCJul 2, 05:38 UTC7h 35m
2026-07-01 UAL748 - Jul 1, 22:10 UTCJul 2, 00:20 UTC2h 10m
2026-07-01 UAL947 - Jul 1, 10:05 UTCJul 1, 18:10 UTC8h 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 N648UA page for operator, model, and routing details .

Mode-S A884B6 frequently asked

What is Mode-S code A884B6?
A884B6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N648UA.
Where is Mode-S A884B6 registered?
Mode-S code A884B6 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 A884B6 broadcasting right now?
Yes. Mode-S A884B6 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A884B6, octal 52102266, decimal 11,044,022.
What flights does A884B6 operate?
Mode-S A884B6 has broadcast 20 distinct callsigns, including UAL52, UAL53, UAL855, UAL854, UAL947.