Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A11BC8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17017 · BOEING 787-10 Dreamliner · operated by UNITED AIRLINES INC

Hex
A11BC8
Octal
50215710
Decimal
10,558,408
Country
US
Tail
N17017
Type
B78X
No current signal · last broadcast Jul 26, 12:30 UTC
Flights observed
297
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 12:30 UTC

Last known position

Most recent position reported by Mode-S A11BC8.

Country allocation

The ICAO 24-bit address A11BC8 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 - 26 2026-07-23
UAL987 United Airlines 22 2026-07-22
UAL219 - 22 2026-07-08
UAL881 - 17 2026-07-09
UAL218 - 16 2026-07-09
UAL882 United Airlines 15 2026-07-22
UAL906 United Airlines 12 2026-06-12
UAL844 - 12 2026-06-28
UAL125 - 12 2026-07-18
UAL845 United Airlines 11 2026-07-26
UAL65 - 11 2026-07-19
UAL907 United Airlines 10 2026-06-12
UAL971 United Airlines 9 2026-06-10
UAL64 United Airlines 9 2026-07-19
UAL38 - 9 2026-07-10
UAL124 United Airlines 7 2026-07-17
UAL423 United Airlines 6 2026-07-24
UAL39 United Airlines 6 2026-07-21
UAL994 United Airlines 5 2026-06-24
UAL973 - 5 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL845 ORD → GRU Jul 26, 03:05 UTCJul 26, 12:30 UTC9h 26m
2026-07-25 UAL415 DEN → LGA Jul 25, 13:50 UTCJul 25, 22:30 UTC8h 40m
2026-07-25 UAL416 ORD → MXP Jul 25, 03:25 UTCJul 25, 11:30 UTC8h 5m
2026-07-24 UAL423 YYZ → DEN Jul 24, 10:55 UTCJul 24, 21:35 UTC10h 40m
2026-07-23 UAL422 DEN → BOS Jul 23, 22:00 UTCJul 24, 07:10 UTC9h 10m
2026-07-23 UAL986 - Jul 23, 09:30 UTCJul 23, 17:30 UTC8h 0m
2026-07-22 UAL987 ORD → CDG Jul 22, 23:45 UTCJul 23, 01:55 UTC2h 10m
2026-07-22 UAL987 ORD → CDG Jul 22, 23:52 UTCJul 23, 07:07 UTC7h 15m
2026-07-22 UAL882 HND → ORD Jul 22, 14:10 UTCJul 22, 19:40 UTC5h 30m
2026-07-21 UAL39 LAX → HND Jul 21, 19:10 UTCJul 22, 05:25 UTC10h 15m
2026-07-20 UAL212 DEN → SBA Jul 20, 17:10 UTCJul 20, 21:45 UTC4h 35m
2026-07-20 UAL2303 IAD → SAN Jul 20, 08:10 UTCJul 20, 12:50 UTC4h 40m
2026-07-20 UAL2238 IAH → SFO Jul 20, 01:35 UTCJul 20, 06:05 UTC4h 30m
2026-07-19 UAL65 LIS → EWR Jul 19, 14:17 UTCJul 19, 21:01 UTC6h 44m
2026-07-19 UAL65 - Jul 19, 14:15 UTCJul 19, 14:55 UTC40m
2026-07-19 UAL64 EWR → LIS Jul 19, 05:40 UTCJul 19, 11:50 UTC6h 10m
2026-07-18 UAL125 ATH → EWR Jul 18, 07:50 UTCJul 18, 18:05 UTC10h 15m
2026-07-17 UAL124 EWR → ATH Jul 17, 20:40 UTCJul 18, 05:20 UTC8h 41m
2026-07-17 UAL65 LIS → EWR Jul 17, 10:05 UTCJul 17, 17:05 UTC7h 0m
2026-07-17 UAL64 EWR → LIS Jul 17, 00:56 UTCJul 17, 07:08 UTC6h 12m
2026-07-17 UAL64 - Jul 17, 01:15 UTCJul 17, 02:05 UTC50m
2026-07-16 UAL125 ATH → EWR Jul 16, 07:40 UTCJul 16, 17:40 UTC10h 0m
2026-07-15 UAL124 EWR → ATH Jul 15, 20:45 UTCJul 16, 05:40 UTC8h 55m
2026-07-15 UAL125 ATH → EWR Jul 15, 07:45 UTCJul 15, 17:50 UTC10h 5m
2026-07-15 UAL125 ATH → EWR Jul 15, 07:45 UTCJul 15, 17:49 UTC10h 4m
2026-07-15 UAL125 - Jul 15, 07:55 UTCJul 15, 08:00 UTC5m
2026-07-14 UAL124 EWR → ATH Jul 14, 20:28 UTCJul 15, 05:05 UTC8h 37m
2026-07-14 UAL124 - Jul 14, 20:25 UTCJul 14, 22:00 UTC1h 35m
2026-07-14 UAL65 LIS → EWR Jul 14, 09:51 UTCJul 14, 16:42 UTC6h 51m
2026-07-14 UAL65 LIS → EWR Jul 14, 10:00 UTCJul 14, 16:45 UTC6h 45m
2026-07-14 UAL64 - Jul 14, 01:20 UTCJul 14, 07:35 UTC6h 15m
2026-07-13 UAL2303 - Jul 13, 06:40 UTCJul 13, 11:20 UTC4h 40m
2026-07-12 UAL2238 - Jul 12, 20:30 UTCJul 13, 01:05 UTC4h 35m
2026-07-12 UAL65 LIS → EWR Jul 12, 09:51 UTCJul 12, 16:31 UTC6h 40m
2026-07-12 UAL65 LIS → EWR Jul 12, 09:45 UTCJul 12, 16:35 UTC6h 50m
2026-07-12 UAL64 EWR → LIS Jul 12, 01:35 UTCJul 12, 07:25 UTC5h 50m
2026-07-10 UAL1981 - Jul 10, 21:20 UTCJul 11, 01:55 UTC4h 35m
2026-07-10 UAL38 HND → LAX Jul 10, 09:35 UTCJul 10, 19:03 UTC9h 28m
2026-07-10 UAL38 HND → LAX Jul 10, 09:40 UTCJul 10, 19:10 UTC9h 30m
2026-07-09 UAL881 - Jul 9, 17:30 UTCJul 10, 05:30 UTC12h 0m
2026-07-09 UAL218 - Jul 9, 06:10 UTCJul 9, 09:30 UTC3h 20m
2026-07-09 UAL218 - Jul 9, 02:15 UTCJul 9, 02:25 UTC10m
2026-07-08 UAL219 - Jul 8, 22:30 UTCJul 8, 22:45 UTC15m
2026-07-08 UAL219 - Jul 8, 14:45 UTCJul 8, 18:40 UTC3h 55m
2026-07-08 UAL218 - Jul 8, 06:40 UTCJul 8, 10:25 UTC3h 45m
2026-07-08 UAL218 - Jul 8, 02:50 UTCJul 8, 03:05 UTC15m
2026-07-07 UAL219 ORD → HNL Jul 7, 15:09 UTCJul 7, 22:46 UTC7h 37m
2026-07-07 UAL219 - Jul 7, 14:45 UTCJul 7, 18:50 UTC4h 5m
2026-07-07 UAL218 - Jul 7, 06:15 UTCJul 7, 09:45 UTC3h 30m
2026-07-07 UAL218 - Jul 7, 02:25 UTCJul 7, 02:40 UTC15m

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 N17017 page for operator, model, and routing details .

Mode-S A11BC8 frequently asked

What is Mode-S code A11BC8?
A11BC8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17017.
Where is Mode-S A11BC8 registered?
Mode-S code A11BC8 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 A11BC8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 12:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A11BC8, octal 50215710, decimal 10,558,408.
What flights does A11BC8 operate?
Mode-S A11BC8 has broadcast 20 distinct callsigns, including UAL986, UAL987, UAL219, UAL881, UAL218.