Apparatus

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sensors Mode-S transponder

A11BC6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17015 · BOEING 787-10 Dreamliner · operated by UNITED AIRLINES INC

Hex
A11BC6
Octal
50215706
Decimal
10,558,406
Country
US
Tail
N17015
Type
B78X
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
232
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A11BC6.

Country allocation

The ICAO 24-bit address A11BC6 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
UAL986 - 15 2026-07-22
UAL987 United Airlines 12 2026-07-21
UAL994 United Airlines 11 2026-07-24
UAL973 United Airlines 11 2026-07-25
UAL971 - 10 2026-07-17
UAL992 United Airlines 9 2026-07-03
UAL945 - 9 2026-06-16
UAL423 - 9 2026-07-18
UAL415 - 9 2026-07-20
UAL124 United Airlines 9 2026-07-24
UAL991 - 8 2026-07-04
UAL972 United Airlines 7 2026-07-25
UAL944 - 7 2026-06-15
UAL125 United Airlines 7 2026-07-24
UAL995 United Airlines 6 2026-07-26
UAL416 United Airlines 6 2026-07-20
UAL39 - 6 2026-07-14
UAL3876 United Airlines 6 2026-04-18
UAL970 - 5 2026-07-16
UAL422 - 5 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2238 IAH → SFO Jul 26, 20:55 UTCJul 26, 21:30 UTC35m
2026-07-26 UAL995 BRU → EWR Jul 26, 09:30 UTCJul 26, 17:10 UTC7h 40m
2026-07-25 UAL972 ORD → BRU Jul 25, 23:40 UTCJul 26, 06:45 UTC7h 6m
2026-07-25 UAL973 BRU → ORD Jul 25, 08:31 UTCJul 25, 16:20 UTC7h 49m
2026-07-25 UAL973 BRU → ORD Jul 25, 08:25 UTCJul 25, 16:35 UTC8h 10m
2026-07-24 UAL994 PBI → ORD Jul 24, 23:29 UTCJul 25, 05:23 UTC5h 54m
2026-07-24 UAL994 PBI → ORD Jul 24, 23:05 UTCJul 24, 23:10 UTC5m
2026-07-24 UAL125 ATH → EWR Jul 24, 10:25 UTCJul 24, 20:00 UTC9h 35m
2026-07-24 UAL124 EWR → ATH Jul 24, 03:10 UTCJul 24, 07:00 UTC3h 50m
2026-07-23 UAL124 EWR → ATH Jul 23, 22:35 UTCJul 23, 23:50 UTC1h 15m
2026-07-23 UAL124 EWR → ATH Jul 23, 22:28 UTCJul 24, 06:54 UTC8h 26m
2026-07-23 UAL995 BRU → EWR Jul 23, 09:25 UTCJul 23, 16:45 UTC7h 20m
2026-07-22 UAL972 ORD → BRU Jul 22, 23:45 UTCJul 23, 06:55 UTC7h 10m
2026-07-22 UAL972 ORD → BRU Jul 22, 23:47 UTCJul 23, 06:50 UTC7h 3m
2026-07-22 UAL986 - Jul 22, 10:20 UTCJul 22, 18:00 UTC7h 40m
2026-07-21 UAL987 ORD → CDG Jul 21, 23:52 UTCJul 22, 07:03 UTC7h 11m
2026-07-21 UAL987 ORD → CDG Jul 21, 23:45 UTCJul 22, 01:00 UTC1h 15m
2026-07-21 UAL981 DUB → ORD Jul 21, 11:20 UTCJul 21, 18:35 UTC7h 15m
2026-07-21 UAL980 ORD → DUB Jul 21, 02:25 UTCJul 21, 08:55 UTC6h 30m
2026-07-20 UAL415 MXP → ORD Jul 20, 13:50 UTCJul 20, 23:05 UTC9h 15m
2026-07-20 UAL416 ORD → MXP Jul 20, 03:30 UTCJul 20, 11:35 UTC8h 5m
2026-07-19 UAL415 MXP → ORD Jul 19, 13:51 UTCJul 19, 22:16 UTC8h 25m
2026-07-19 UAL415 MXP → ORD Jul 19, 13:50 UTCJul 19, 22:35 UTC8h 45m
2026-07-19 UAL416 ORD → MXP Jul 19, 03:35 UTCJul 19, 11:35 UTC8h 0m
2026-07-18 UAL423 - Jul 18, 20:55 UTCJul 18, 21:10 UTC15m
2026-07-18 UAL423 ATH → ORD Jul 18, 10:20 UTCJul 18, 21:10 UTC10h 50m
2026-07-18 UAL423 ATH → ORD Jul 18, 10:15 UTCJul 18, 20:40 UTC10h 25m
2026-07-17 UAL422 - Jul 17, 22:40 UTCJul 18, 03:30 UTC4h 51m
2026-07-17 UAL422 ORD → ATH Jul 17, 22:23 UTCJul 18, 08:02 UTC9h 39m
2026-07-17 UAL971 - Jul 17, 09:20 UTCJul 17, 18:40 UTC9h 20m
2026-07-16 UAL970 - Jul 16, 22:10 UTCJul 17, 06:45 UTC8h 35m
2026-07-16 UAL986 - Jul 16, 18:00 UTCJul 16, 18:05 UTC5m
2026-07-16 UAL986 - Jul 16, 10:04 UTCJul 16, 18:05 UTC8h 0m
2026-07-16 UAL986 CDG → ORD Jul 16, 09:39 UTCJul 16, 17:45 UTC8h 6m
2026-07-15 UAL987 - Jul 15, 23:30 UTCJul 16, 06:55 UTC7h 25m
2026-07-15 UAL882 HND → ORD Jul 15, 08:40 UTCJul 15, 19:50 UTC11h 10m
2026-07-14 UAL39 LAX → HND Jul 14, 19:30 UTCJul 15, 06:00 UTC10h 29m
2026-07-14 UAL2445 - Jul 14, 13:10 UTCJul 14, 17:30 UTC4h 20m
2026-07-14 UAL2397 - Jul 14, 04:35 UTCJul 14, 09:20 UTC4h 45m
2026-07-13 UAL38 - Jul 13, 09:50 UTCJul 13, 19:45 UTC9h 55m
2026-07-12 UAL39 LAX → HND Jul 12, 19:02 UTCJul 13, 06:01 UTC10h 59m
2026-07-12 UAL39 - Jul 12, 19:10 UTCJul 13, 06:01 UTC10h 50m
2026-07-11 UAL38 - Jul 11, 09:40 UTCJul 11, 19:50 UTC10h 10m
2026-07-10 UAL881 - Jul 10, 17:40 UTCJul 11, 05:45 UTC12h 5m
2026-07-10 UAL218 - Jul 10, 02:15 UTCJul 10, 09:45 UTC7h 30m
2026-07-09 UAL219 ORD → HNL Jul 9, 15:09 UTCJul 9, 23:15 UTC8h 6m
2026-07-09 UAL219 - Jul 9, 15:10 UTCJul 9, 23:15 UTC8h 5m
2026-07-09 UAL844 - Jul 9, 01:35 UTCJul 9, 11:10 UTC9h 35m
2026-07-08 UAL845 ORD → GRU Jul 8, 03:05 UTCJul 8, 12:30 UTC9h 25m
2026-07-07 UAL423 - Jul 7, 10:10 UTCJul 7, 11:30 UTC1h 20m

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 N17015 page for operator, model, and routing details .

Mode-S A11BC6 frequently asked

What is Mode-S code A11BC6?
A11BC6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17015.
Where is Mode-S A11BC6 registered?
Mode-S code A11BC6 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 A11BC6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A11BC6, octal 50215706, decimal 10,558,406.
What flights does A11BC6 operate?
Mode-S A11BC6 has broadcast 20 distinct callsigns, including UAL986, UAL987, UAL994, UAL973, UAL971.