Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A8B5FC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N660UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A8B5FC
Octal
52132774
Decimal
11,056,636
Country
US
Tail
N660UA
Type
B763
No current signal · last broadcast 2h ago
Flights observed
117
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A8B5FC.

Country allocation

The ICAO 24-bit address A8B5FC 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 United Airlines 16 2026-06-08
UAL854 United Airlines 15 2026-06-08
UAL129 United Airlines 12 2026-06-07
UAL855 United Airlines 10 2026-05-29
UAL53 United Airlines 8 2026-06-03
UAL52 United Airlines 8 2026-06-02
UAL20 - 8 2026-06-13
UAL21 United Airlines 7 2026-06-06
UAL946 United Airlines 5 2026-06-05
UAL947 - 4 2026-06-14
UAL8223 United Airlines 4 2026-04-18
UAL331 United Airlines 3 2026-05-08
UAL242 United Airlines 3 2026-06-16
UAL748 - 2 2026-06-15
UAL3912 United Airlines 2 2026-05-27
UAL330 United Airlines 2 2026-05-08
UAL322 United Airlines 2 2026-06-15
UAL925 United Airlines 1 2026-05-07
UAL924 United Airlines 1 2026-05-07
UAL855D - 1 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-17 UAL243 SFO → BOI Jun 17, 08:05 UTCJun 17, 10:35 UTC2h 30m
2026-06-16 UAL242 PDX → SFO Jun 16, 21:45 UTCJun 17, 05:30 UTC7h 45m
2026-06-16 UAL242 PDX → SFO Jun 16, 21:48 UTCJun 17, 05:30 UTC7h 42m
2026-06-16 UAL242 PDX → SFO Jun 16, 21:30 UTCJun 16, 21:35 UTC5m
2026-06-16 UAL749 - Jun 16, 09:04 UTCJun 16, 17:40 UTC8h 35m
2026-06-15 UAL748 - Jun 15, 21:45 UTCJun 15, 23:39 UTC1h 55m
2026-06-15 UAL748 IAD → GVA Jun 15, 21:43 UTCJun 16, 05:12 UTC7h 29m
2026-06-15 UAL322 BOI → DEN Jun 15, 08:15 UTCJun 15, 17:20 UTC9h 5m
2026-06-15 UAL322 BOI → DEN Jun 15, 08:04 UTCJun 15, 17:16 UTC9h 12m
2026-06-14 UAL321 ATL → EWR Jun 14, 21:40 UTCJun 15, 05:20 UTC7h 40m
2026-06-14 UAL947 - Jun 14, 09:45 UTCJun 14, 17:50 UTC8h 5m
2026-06-13 UAL20 - Jun 13, 21:50 UTCJun 14, 07:00 UTC9h 11m
2026-06-13 UAL20 IAH → AMS Jun 13, 21:47 UTCJun 14, 06:44 UTC8h 57m
2026-06-12 UAL855D - Jun 12, 08:40 UTCJun 12, 14:25 UTC5h 45m
2026-06-08 UAL854 IAH → LIM Jun 8, 21:35 UTCJun 9, 03:10 UTC5h 35m
2026-06-08 UAL128 GIG → IAH Jun 8, 00:15 UTCJun 8, 10:15 UTC10h 0m
2026-06-07 UAL129 IAH → GIG Jun 7, 01:35 UTCJun 7, 11:00 UTC9h 25m
2026-06-07 UAL129 IAH → GIG Jun 7, 01:36 UTCJun 7, 10:53 UTC9h 17m
2026-06-06 UAL21 AMS → IAH Jun 6, 09:19 UTCJun 6, 19:40 UTC10h 20m
2026-06-05 UAL946 IAD → AMS Jun 5, 21:53 UTCJun 6, 05:43 UTC7h 50m
2026-06-05 UAL946 IAD → AMS Jun 5, 22:40 UTCJun 6, 00:45 UTC2h 5m
2026-06-03 UAL53 ZRH → IAD Jun 3, 10:24 UTCJun 3, 19:10 UTC8h 46m
2026-06-03 UAL53 ZRH → IAD Jun 3, 10:25 UTCJun 3, 19:15 UTC8h 50m
2026-06-02 UAL52 IAD → ZRH Jun 2, 22:20 UTCJun 3, 05:20 UTC7h 0m
2026-06-02 UAL53 ZRH → IAD Jun 2, 10:30 UTCJun 2, 18:55 UTC8h 25m
2026-06-02 UAL52 IAD → ZRH Jun 2, 00:08 UTCJun 2, 07:13 UTC7h 5m
2026-06-02 UAL52 IAD → ZRH Jun 2, 00:10 UTCJun 2, 00:50 UTC40m
2026-06-01 UAL53 ZRH → IAD Jun 1, 10:15 UTCJun 1, 11:00 UTC45m
2026-06-01 UAL53 ZRH → IAD Jun 1, 10:14 UTCJun 1, 18:59 UTC8h 45m
2026-05-31 UAL52 IAD → ZRH May 31, 22:35 UTCJun 1, 06:05 UTC7h 30m
2026-05-31 UAL53 ZRH → IAD May 31, 10:25 UTCMay 31, 19:10 UTC8h 45m
2026-05-31 UAL53 ZRH → IAD May 31, 10:14 UTCMay 31, 19:06 UTC8h 52m
2026-05-30 UAL52 IAD → ZRH May 30, 22:03 UTCMay 31, 05:58 UTC7h 55m
2026-05-30 UAL52 IAD → ZRH May 30, 22:20 UTCMay 31, 00:25 UTC2h 5m
2026-05-30 UAL947 AMS → IAD May 30, 09:45 UTCMay 30, 17:45 UTC8h 0m
2026-05-29 UAL20 IAH → AMS May 29, 21:40 UTCMay 30, 06:50 UTC9h 10m
2026-05-29 UAL855 LIM → IAH May 29, 06:30 UTCMay 29, 12:25 UTC5h 55m
2026-05-29 UAL855 LIM → IAH May 29, 06:13 UTCMay 29, 12:27 UTC6h 14m
2026-05-28 UAL854 IAH → LIM May 28, 21:50 UTCMay 29, 03:45 UTC5h 55m
2026-05-27 UAL3912 LAX → SFO May 27, 10:35 UTCMay 27, 14:30 UTC3h 55m
2026-05-27 UAL3912 LAX → SFO May 27, 09:57 UTCMay 27, 16:27 UTC6h 30m
2026-05-25 UAL854 IAH → LIM May 25, 22:05 UTCMay 26, 03:45 UTC5h 40m
2026-05-25 UAL855 LIM → IAH May 25, 06:35 UTCMay 25, 12:50 UTC6h 15m
2026-05-24 UAL854 IAH → LIM May 24, 23:05 UTCMay 25, 03:40 UTC4h 35m
2026-05-24 UAL854 IAH → LIM May 24, 22:02 UTCMay 25, 03:55 UTC5h 53m
2026-05-24 UAL855 LIM → IAH May 24, 08:15 UTCMay 24, 14:20 UTC6h 5m
2026-05-24 UAL854 IAH → LIM May 24, 00:05 UTCMay 24, 05:45 UTC5h 40m
2026-05-23 UAL854 IAH → LIM May 23, 23:45 UTCMay 24, 06:00 UTC6h 15m
2026-05-23 UAL128 GIG → IAH May 23, 13:35 UTCMay 23, 14:05 UTC30m
2026-05-23 UAL128 GIG → IAH May 23, 01:20 UTCMay 23, 11:30 UTC10h 9m

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 N660UA page for operator, model, and routing details .

Mode-S A8B5FC frequently asked

What is Mode-S code A8B5FC?
A8B5FC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N660UA.
Where is Mode-S A8B5FC registered?
Mode-S code A8B5FC 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 A8B5FC broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8B5FC, octal 52132774, decimal 11,056,636.
What flights does A8B5FC operate?
Mode-S A8B5FC has broadcast 20 distinct callsigns, including UAL128, UAL854, UAL129, UAL855, UAL53.