Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
No current signal · last broadcast 9h ago
Flights observed
117
Distinct callsigns
20
Country
US
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S A884B6.

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
UAL53 United Airlines 13 2026-06-04
UAL855 - 12 2026-06-16
UAL52 United Airlines 11 2026-06-03
UAL854 - 9 2026-06-16
UAL947 United Airlines 6 2026-06-01
UAL128 United Airlines 6 2026-06-11
UAL129 United Airlines 5 2026-06-10
UAL992 United Airlines 4 2026-05-06
UAL946 United Airlines 4 2026-06-08
UAL925 United Airlines 4 2026-05-20
UAL21 United Airlines 4 2026-06-09
UAL20 United Airlines 4 2026-05-31
UAL861 United Airlines 3 2026-05-21
UAL860 United Airlines 3 2026-05-22
UAL749 United Airlines 3 2026-06-02
UAL748 United Airlines 3 2026-06-01
UAL331 United Airlines 3 2026-05-18
UAL127 United Airlines 3 2026-06-07
UAL126 United Airlines 3 2026-06-07
UAL991 United Airlines 2 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-16 UAL854 - Jun 16, 21:45 UTCJun 17, 00:35 UTC2h 50m
2026-06-16 UAL855 - Jun 16, 10:25 UTCJun 16, 12:55 UTC2h 30m
2026-06-16 UAL855 - Jun 16, 06:25 UTCJun 16, 10:15 UTC3h 50m
2026-06-15 UAL854 - Jun 15, 21:50 UTCJun 16, 03:39 UTC5h 50m
2026-06-13 UAL855 LIM → IAH Jun 13, 06:35 UTCJun 13, 12:30 UTC5h 55m
2026-06-13 UAL855 LIM → IAH Jun 13, 06:13 UTCJun 13, 12:29 UTC6h 16m
2026-06-12 UAL854 - Jun 12, 21:45 UTCJun 13, 03:30 UTC5h 45m
2026-06-12 UAL855 LIM → IAH Jun 12, 06:50 UTCJun 12, 07:25 UTC35m
2026-06-12 UAL855 LIM → IAH Jun 12, 06:13 UTCJun 12, 12:45 UTC6h 32m
2026-06-12 UAL855 LIM → IAH Jun 12, 06:13 UTCJun 12, 12:42 UTC6h 29m
2026-06-11 UAL854 - Jun 11, 22:00 UTCJun 12, 03:40 UTC5h 40m
2026-06-11 UAL128 GIG → IAH Jun 11, 01:10 UTCJun 11, 10:25 UTC9h 15m
2026-06-11 UAL128 GIG → IAH Jun 11, 00:15 UTCJun 11, 00:25 UTC10m
2026-06-11 UAL128 GIG → IAH Jun 11, 00:26 UTCJun 11, 10:25 UTC9h 59m
2026-06-10 UAL129 IAH → GIG Jun 10, 01:25 UTCJun 10, 10:30 UTC9h 5m
2026-06-10 UAL129 IAH → GIG Jun 10, 01:21 UTCJun 10, 10:40 UTC9h 19m
2026-06-09 UAL21 AMS → IAH Jun 9, 09:40 UTCJun 9, 20:15 UTC10h 35m
2026-06-08 UAL946 IAD → AMS Jun 8, 22:10 UTCJun 9, 05:20 UTC7h 10m
2026-06-08 UAL946 IAD → AMS Jun 8, 21:53 UTCJun 9, 05:10 UTC7h 17m
2026-06-07 UAL127 DUB → IAD Jun 7, 14:25 UTCJun 7, 23:35 UTC9h 10m
2026-06-07 UAL126 IAD → DUB Jun 7, 03:10 UTCJun 7, 11:10 UTC8h 0m
2026-06-06 UAL127 DUB → IAD Jun 6, 13:39 UTCJun 6, 23:30 UTC9h 50m
2026-06-06 UAL127 DUB → IAD Jun 6, 13:47 UTCJun 6, 23:21 UTC9h 34m
2026-06-06 UAL126 IAD → DUB Jun 6, 02:35 UTCJun 6, 10:30 UTC7h 55m
2026-06-06 UAL126 IAD → DUB Jun 6, 02:25 UTCJun 6, 02:30 UTC5m
2026-06-05 UAL243 SFO → BOI Jun 5, 08:10 UTCJun 5, 17:20 UTC9h 10m
2026-06-04 UAL242 PDX → SFO Jun 4, 21:48 UTCJun 5, 05:44 UTC7h 56m
2026-06-04 UAL242 PDX → SFO Jun 4, 21:45 UTCJun 5, 03:30 UTC5h 45m
2026-06-04 UAL53 ZRH → IAD Jun 4, 10:20 UTCJun 4, 19:25 UTC9h 5m
2026-06-04 UAL53 ZRH → IAD Jun 4, 10:14 UTCJun 4, 19:21 UTC9h 7m
2026-06-03 UAL52 IAD → ZRH Jun 3, 22:03 UTCJun 4, 05:47 UTC7h 44m
2026-06-03 UAL52 IAD → ZRH Jun 3, 22:15 UTCJun 4, 00:20 UTC2h 5m
2026-06-03 UAL322 BOI → DEN Jun 3, 07:50 UTCJun 3, 17:05 UTC9h 15m
2026-06-02 UAL321 ATL → EWR Jun 2, 21:45 UTCJun 3, 05:40 UTC7h 55m
2026-06-02 UAL749 CVG → DEN Jun 2, 09:10 UTCJun 2, 17:15 UTC8h 5m
2026-06-01 UAL748 PHL → ORD Jun 1, 21:43 UTCJun 2, 04:50 UTC7h 7m
2026-06-01 UAL748 PHL → ORD Jun 1, 21:40 UTCJun 2, 04:55 UTC7h 15m
2026-06-01 UAL947 AMS → IAD Jun 1, 09:35 UTCJun 1, 17:23 UTC7h 48m
2026-06-01 UAL947 AMS → IAD Jun 1, 09:35 UTCJun 1, 17:11 UTC7h 36m
2026-06-01 UAL947 AMS → IAD Jun 1, 09:25 UTCJun 1, 11:05 UTC1h 40m
2026-05-31 UAL20 IAH → AMS May 31, 21:35 UTCJun 1, 01:30 UTC3h 55m
2026-05-31 UAL20 IAH → AMS May 31, 21:47 UTCJun 1, 06:48 UTC9h 1m
2026-05-31 UAL128 GIG → IAH May 31, 00:10 UTCMay 31, 10:25 UTC10h 15m
2026-05-30 UAL129 IAH → GIG May 30, 01:25 UTCMay 30, 11:05 UTC9h 40m
2026-05-29 UAL21 AMS → IAH May 29, 09:25 UTCMay 29, 19:30 UTC10h 5m
2026-05-29 UAL21 AMS → IAH May 29, 09:25 UTCMay 29, 19:26 UTC10h 1m
2026-05-28 UAL946 IAD → AMS May 28, 22:45 UTCMay 29, 05:55 UTC7h 10m
2026-05-27 UAL53 ZRH → IAD May 27, 10:15 UTCMay 27, 18:50 UTC8h 35m
2026-05-27 UAL53 ZRH → IAD May 27, 10:14 UTCMay 27, 18:48 UTC8h 34m
2026-05-26 UAL52 IAD → ZRH May 26, 22:25 UTCMay 27, 06:15 UTC7h 50m

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?
No active broadcast right now. Last signal was 9h ago.
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 UAL53, UAL855, UAL52, UAL854, UAL947.