Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A880FF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N647UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A880FF
Octal
52100377
Decimal
11,043,071
Country
US
Tail
N647UA
Type
B763
No current signal · last broadcast 4d ago
Flights observed
180
Distinct callsigns
20
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S A880FF.

Country allocation

The ICAO 24-bit address A880FF 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
UAL128 - 19 2026-07-03
UAL129 - 16 2026-07-02
UAL946 - 15 2026-06-30
UAL21 United Airlines 13 2026-07-07
UAL947 - 12 2026-06-25
UAL53 - 12 2026-06-30
UAL52 - 12 2026-06-29
UAL20 - 12 2026-07-06
UAL855 - 10 2026-07-06
UAL854 - 10 2026-07-05
UAL321 United Airlines 7 2026-06-13
UAL126 United Airlines 7 2026-06-02
UAL748 United Airlines 6 2026-05-29
UAL322 United Airlines 6 2026-06-14
UAL127 United Airlines 6 2026-06-02
UAL749 United Airlines 5 2026-05-30
UAL243 - 4 2026-06-29
UAL242 - 3 2026-06-28
UAL129D United Airlines 2 2026-05-01
UAL855D - 1 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-09 UAL3893 - Jul 9, 02:15 UTCJul 9, 11:50 UTC9h 35m
2026-07-07 UAL21 AMS → IAH Jul 7, 09:40 UTCJul 7, 11:15 UTC1h 35m
2026-07-07 UAL21 AMS → IAH Jul 7, 09:35 UTCJul 7, 19:48 UTC10h 13m
2026-07-06 UAL20 - Jul 6, 21:40 UTCJul 7, 06:25 UTC8h 45m
2026-07-06 UAL20 IAH → AMS Jul 6, 21:47 UTCJul 7, 06:15 UTC8h 28m
2026-07-06 UAL855 - Jul 6, 06:20 UTCJul 6, 12:20 UTC6h 0m
2026-07-05 UAL854 - Jul 5, 21:35 UTCJul 6, 03:05 UTC5h 30m
2026-07-05 UAL855D - Jul 5, 08:55 UTCJul 5, 15:05 UTC6h 10m
2026-07-03 UAL854 - Jul 3, 21:40 UTCJul 4, 03:20 UTC5h 40m
2026-07-03 UAL128 - Jul 3, 01:30 UTCJul 3, 10:20 UTC8h 50m
2026-07-02 UAL128 - Jul 2, 11:50 UTCJul 3, 10:20 UTC22h 30m
2026-07-02 UAL129 - Jul 2, 09:20 UTCJul 3, 06:40 UTC21h 20m
2026-07-02 UAL129 - Jul 2, 05:50 UTCJul 3, 05:45 UTC23h 55m
2026-07-02 UAL129 - Jul 2, 04:25 UTCJul 2, 09:30 UTC5h 5m
2026-07-02 UAL129 IAH → GIG Jul 2, 04:21 UTCJul 2, 13:32 UTC9h 11m
2026-07-01 UAL21 AMS → IAH Jul 1, 10:30 UTCJul 1, 19:50 UTC9h 20m
2026-07-01 UAL21 AMS → IAH Jul 1, 09:25 UTCJul 1, 10:25 UTC1h 0m
2026-06-30 UAL946 - Jun 30, 21:45 UTCJul 1, 05:00 UTC7h 15m
2026-06-30 UAL53 ZRH → IAD Jun 30, 10:20 UTCJun 30, 18:50 UTC8h 30m
2026-06-29 UAL52 - Jun 29, 22:15 UTCJun 30, 05:45 UTC7h 30m
2026-06-29 UAL52 IAD → ZRH Jun 29, 22:03 UTCJun 30, 06:00 UTC7h 57m
2026-06-29 UAL243 NCE → IAD Jun 29, 08:19 UTCJun 29, 17:14 UTC8h 55m
2026-06-28 UAL242 IAD → NCE Jun 28, 21:48 UTCJun 29, 05:36 UTC7h 48m
2026-06-28 UAL242 - Jun 28, 21:40 UTCJun 28, 23:44 UTC2h 5m
2026-06-28 UAL243 NCE → IAD Jun 28, 08:59 UTCJun 28, 17:25 UTC8h 26m
2026-06-28 UAL243 NCE → IAD Jun 28, 08:59 UTCJun 28, 17:24 UTC8h 25m
2026-06-28 UAL243 - Jun 28, 08:25 UTCJun 28, 08:39 UTC15m
2026-06-27 UAL242 IAD → NCE Jun 27, 21:55 UTCJun 28, 05:29 UTC7h 35m
2026-06-26 UAL53 ZRH → IAD Jun 26, 10:30 UTCJun 26, 19:14 UTC8h 45m
2026-06-25 UAL52 IAD → ZRH Jun 25, 22:03 UTCJun 26, 05:29 UTC7h 26m
2026-06-25 UAL52 IAD → ZRH Jun 25, 21:59 UTCJun 26, 05:30 UTC7h 30m
2026-06-25 UAL947 AMS → IAD Jun 25, 09:45 UTCJun 25, 17:51 UTC8h 6m
2026-06-25 UAL947 - Jun 25, 09:50 UTCJun 25, 11:10 UTC1h 20m
2026-06-24 UAL946 IAD → AMS Jun 24, 21:53 UTCJun 25, 04:56 UTC7h 3m
2026-06-24 UAL946 IAD → AMS Jun 24, 22:00 UTCJun 25, 05:05 UTC7h 5m
2026-06-24 UAL947 AMS → IAD Jun 24, 09:59 UTCJun 24, 18:05 UTC8h 5m
2026-06-23 UAL20 - Jun 23, 21:45 UTCJun 24, 06:50 UTC9h 5m
2026-06-23 UAL855 LIM → IAH Jun 23, 06:28 UTCJun 23, 12:47 UTC6h 19m
2026-06-23 UAL855 LIM → IAH Jun 23, 06:28 UTCJun 23, 12:45 UTC6h 17m
2026-06-22 UAL854 - Jun 22, 22:34 UTCJun 23, 01:10 UTC2h 35m
2026-06-19 UAL21 AMS → IAH Jun 19, 09:30 UTCJun 19, 19:25 UTC9h 55m
2026-06-18 UAL946 IAD → AMS Jun 18, 21:53 UTCJun 19, 05:01 UTC7h 8m
2026-06-18 UAL946 IAD → AMS Jun 18, 21:55 UTCJun 19, 05:09 UTC7h 14m
2026-06-14 UAL322 BOI → DEN Jun 14, 07:50 UTCJun 14, 16:55 UTC9h 5m
2026-06-13 UAL321 ATL → EWR Jun 13, 21:30 UTCJun 14, 05:25 UTC7h 55m
2026-06-13 UAL321 ATL → EWR Jun 13, 21:38 UTCJun 14, 05:19 UTC7h 41m
2026-06-12 UAL53 - Jun 12, 10:15 UTCJun 12, 11:45 UTC1h 30m
2026-06-12 UAL53 ZRH → IAD Jun 12, 10:14 UTCJun 12, 19:15 UTC9h 1m
2026-06-11 UAL52 - Jun 11, 22:00 UTCJun 12, 05:30 UTC7h 30m
2026-06-11 UAL52 IAD → ZRH Jun 11, 21:45 UTCJun 11, 21:50 UTC5m

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 N647UA page for operator, model, and routing details .

Mode-S A880FF frequently asked

What is Mode-S code A880FF?
A880FF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N647UA.
Where is Mode-S A880FF registered?
Mode-S code A880FF 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 A880FF 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 A880FF, octal 52100377, decimal 11,043,071.
What flights does A880FF operate?
Mode-S A880FF has broadcast 20 distinct callsigns, including UAL128, UAL129, UAL946, UAL21, UAL947.