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 1h ago
Flights observed
107
Distinct callsigns
18
Country
US
Last broadcast
1h 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 18 distinct

Callsign Airline Flights Last seen
UAL128 United Airlines 17 2026-05-18
UAL129 United Airlines 12 2026-05-20
UAL946 United Airlines 10 2026-05-15
UAL947 United Airlines 9 2026-05-24
UAL20 United Airlines 9 2026-05-23
UAL21 United Airlines 8 2026-05-16
UAL855 United Airlines 7 2026-05-23
UAL854 United Airlines 7 2026-05-22
UAL748 United Airlines 6 2026-05-29
UAL749 United Airlines 4 2026-04-28
UAL127 United Airlines 4 2026-05-27
UAL126 United Airlines 4 2026-05-27
UAL53 United Airlines 3 2026-05-12
UAL52 United Airlines 2 2026-05-11
UAL129D United Airlines 2 2026-05-01
UAL322 United Airlines 1 2026-05-29
UAL321 United Airlines 1 2026-05-28
UAL3018 United Airlines 1 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 UAL748 PHL → ORD May 29, 23:03 UTCMay 30, 06:52 UTC7h 49m
2026-05-29 UAL748 PHL → ORD May 29, 23:00 UTCMay 30, 06:40 UTC7h 40m
2026-05-29 UAL322 BOI → DEN May 29, 08:15 UTCMay 29, 17:25 UTC9h 10m
2026-05-28 UAL321 ATL → EWR May 28, 21:45 UTCMay 29, 05:45 UTC8h 0m
2026-05-27 UAL127 DUB → IAD May 27, 13:55 UTCMay 27, 23:00 UTC9h 5m
2026-05-27 UAL126 IAD → DUB May 27, 02:38 UTCMay 27, 11:26 UTC8h 48m
2026-05-27 UAL126 IAD → DUB May 27, 02:49 UTCMay 27, 11:15 UTC8h 26m
2026-05-26 UAL127 DUB → IAD May 26, 13:34 UTCMay 26, 22:25 UTC8h 50m
2026-05-26 UAL126 IAD → DUB May 26, 02:49 UTCMay 26, 11:09 UTC8h 20m
2026-05-25 UAL127 DUB → IAD May 25, 13:50 UTCMay 25, 21:45 UTC7h 54m
2026-05-25 UAL127 DUB → IAD May 25, 13:47 UTCMay 25, 23:05 UTC9h 18m
2026-05-25 UAL126 IAD → DUB May 25, 02:35 UTCMay 25, 11:05 UTC8h 30m
2026-05-24 UAL947 AMS → IAD May 24, 09:25 UTCMay 24, 17:30 UTC8h 5m
2026-05-23 UAL20 IAH → AMS May 23, 21:50 UTCMay 24, 06:40 UTC8h 50m
2026-05-23 UAL855 LIM → IAH May 23, 06:55 UTCMay 23, 13:00 UTC6h 5m
2026-05-22 UAL854 IAH → LIM May 22, 21:40 UTCMay 23, 03:25 UTC5h 44m
2026-05-22 UAL854 IAH → LIM May 22, 21:42 UTCMay 23, 03:40 UTC5h 58m
2026-05-22 UAL3018 IAD → FRA May 22, 02:10 UTCMay 22, 12:10 UTC10h 0m
2026-05-20 UAL129 IAH → GIG May 20, 02:55 UTCMay 20, 05:45 UTC2h 51m
2026-05-20 UAL129 IAH → GIG May 20, 01:45 UTCMay 20, 02:00 UTC15m
2026-05-20 UAL129 IAH → GIG May 20, 01:51 UTCMay 20, 11:03 UTC9h 12m
2026-05-19 UAL855 LIM → IAH May 19, 07:30 UTCMay 19, 07:45 UTC15m
2026-05-19 UAL855 LIM → IAH May 19, 07:18 UTCMay 19, 13:19 UTC6h 1m
2026-05-19 UAL855 LIM → IAH May 19, 07:18 UTCMay 19, 13:29 UTC6h 11m
2026-05-18 UAL854 IAH → LIM May 18, 23:30 UTCMay 19, 04:55 UTC5h 25m
2026-05-18 UAL128 GIG → IAH May 18, 04:45 UTCMay 18, 10:25 UTC5h 40m
2026-05-18 UAL128 GIG → IAH May 18, 00:15 UTCMay 18, 00:25 UTC10m
2026-05-17 UAL129 IAH → GIG May 17, 02:20 UTCMay 17, 06:50 UTC4h 30m
2026-05-17 UAL129 IAH → GIG May 17, 01:15 UTCMay 17, 01:30 UTC15m
2026-05-17 UAL129 IAH → GIG May 17, 01:21 UTCMay 17, 10:21 UTC9h 0m
2026-05-16 UAL21 AMS → IAH May 16, 09:16 UTCMay 16, 19:35 UTC10h 20m
2026-05-15 UAL946 IAD → AMS May 15, 22:20 UTCMay 16, 05:15 UTC6h 55m
2026-05-15 UAL946 IAD → AMS May 15, 21:50 UTCMay 15, 21:55 UTC5m
2026-05-15 UAL946 IAD → AMS May 15, 21:53 UTCMay 16, 05:03 UTC7h 10m
2026-05-15 UAL947 AMS → IAD May 15, 09:45 UTCMay 15, 17:50 UTC8h 4m
2026-05-15 UAL947 AMS → IAD May 15, 09:45 UTCMay 15, 17:46 UTC8h 1m
2026-05-14 UAL20 IAH → AMS May 14, 22:20 UTCMay 15, 07:50 UTC9h 30m
2026-05-13 UAL21 AMS → IAH May 13, 09:05 UTCMay 13, 19:20 UTC10h 15m
2026-05-12 UAL946 IAD → AMS May 12, 23:15 UTCMay 13, 06:25 UTC7h 10m
2026-05-12 UAL53 ZRH → IAD May 12, 10:10 UTCMay 12, 11:45 UTC1h 35m
2026-05-12 UAL53 ZRH → IAD May 12, 10:14 UTCMay 12, 19:04 UTC8h 50m
2026-05-12 UAL53 ZRH → IAD May 12, 10:14 UTCMay 12, 18:53 UTC8h 39m
2026-05-11 UAL52 IAD → ZRH May 11, 21:58 UTCMay 12, 05:27 UTC7h 29m
2026-05-11 UAL52 IAD → ZRH May 11, 22:00 UTCMay 12, 05:25 UTC7h 25m
2026-05-11 UAL947 AMS → IAD May 11, 09:35 UTCMay 11, 17:55 UTC8h 20m
2026-05-10 UAL20 IAH → AMS May 10, 22:30 UTCMay 11, 07:40 UTC9h 10m
2026-05-10 UAL128 GIG → IAH May 10, 02:10 UTCMay 10, 10:05 UTC7h 55m
2026-05-10 UAL128 GIG → IAH May 10, 00:15 UTCMay 10, 00:24 UTC10m
2026-05-10 UAL128 GIG → IAH May 10, 00:26 UTCMay 10, 10:04 UTC9h 38m
2026-05-09 UAL129 IAH → GIG May 9, 01:40 UTCMay 9, 11:05 UTC9h 25m

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 1h 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 18 distinct callsigns, including UAL128, UAL129, UAL946, UAL947, UAL20.