Apparatus

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sensors Mode-S transponder

A2CA64

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27908 · BOEING 787-8 Dreamliner · operated by UNITED AIRLINES INC

Hex
A2CA64
Octal
50545144
Decimal
10,668,644
Country
US
Tail
N27908
Type
B788
No current signal · last broadcast Jul 26, 18:30 UTC
Flights observed
264
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:30 UTC

Last known position

Most recent position reported by Mode-S A2CA64.

Country allocation

The ICAO 24-bit address A2CA64 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
UAL770 - 24 2026-07-08
UAL769 - 24 2026-07-08
UAL952 United Airlines 20 2026-07-25
UAL908 - 16 2026-07-07
UAL109 United Airlines 15 2026-07-24
UAL108 United Airlines 15 2026-07-24
UAL909 United Airlines 14 2026-07-07
UAL981 United Airlines 12 2026-07-26
UAL980 United Airlines 12 2026-07-26
UAL612 United Airlines 12 2026-07-19
UAL953 United Airlines 10 2026-07-23
UAL613 United Airlines 9 2026-07-20
UAL996 - 8 2026-07-13
UAL982 - 8 2026-07-12
UAL983 - 7 2026-07-13
UAL997 - 6 2026-07-15
UAL415 United Airlines 5 2026-04-30
UAL423 - 4 2026-04-14
UAL416 United Airlines 4 2026-04-30
UAL345 - 4 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL981 DUB → ORD Jul 26, 10:55 UTCJul 26, 18:20 UTC7h 25m
2026-07-26 UAL980 ORD → DUB Jul 26, 02:10 UTCJul 26, 08:55 UTC6h 46m
2026-07-26 UAL980 ORD → DUB Jul 26, 02:08 UTCJul 26, 08:54 UTC6h 46m
2026-07-25 UAL952 MUC → ORD Jul 25, 09:50 UTCJul 25, 18:45 UTC8h 55m
2026-07-25 UAL952 MUC → ORD Jul 25, 09:47 UTCJul 25, 18:31 UTC8h 44m
2026-07-24 UAL108 EWR → EDI Jul 24, 21:53 UTCJul 25, 05:44 UTC7h 51m
2026-07-24 UAL108 EWR → EDI Jul 24, 22:20 UTCJul 25, 00:20 UTC2h 0m
2026-07-24 UAL109 EDI → EWR Jul 24, 10:20 UTCJul 24, 18:40 UTC8h 20m
2026-07-23 UAL953 ORD → MUC Jul 23, 23:35 UTCJul 24, 07:20 UTC7h 45m
2026-07-22 UAL952 MUC → ORD Jul 22, 18:40 UTCJul 22, 18:45 UTC5m
2026-07-22 UAL952 MUC → ORD Jul 22, 10:20 UTCJul 22, 12:05 UTC1h 45m
2026-07-22 UAL952 MUC → ORD Jul 22, 09:47 UTCJul 22, 18:21 UTC8h 34m
2026-07-21 UAL108 - Jul 21, 22:35 UTCJul 22, 00:35 UTC2h 0m
2026-07-21 UAL108 IAD → MUC Jul 21, 21:53 UTCJul 22, 06:25 UTC8h 32m
2026-07-21 UAL344 - Jul 21, 05:30 UTCJul 21, 10:00 UTC4h 30m
2026-07-20 UAL345 - Jul 20, 21:45 UTCJul 20, 22:05 UTC20m
2026-07-20 UAL345 - Jul 20, 12:40 UTCJul 20, 17:50 UTC5h 10m
2026-07-20 UAL613 LOS → IAD Jul 20, 01:45 UTCJul 20, 09:50 UTC8h 5m
2026-07-19 UAL613 LOS → IAD Jul 19, 11:30 UTCJul 20, 09:50 UTC22h 20m
2026-07-19 UAL612 IAD → LOS Jul 19, 05:05 UTCJul 20, 02:35 UTC21h 30m
2026-07-19 UAL612 IAD → LOS Jul 19, 04:43 UTCJul 19, 15:04 UTC10h 21m
2026-07-19 UAL612 IAD → LOS Jul 19, 04:45 UTCJul 20, 02:35 UTC21h 50m
2026-07-18 UAL109 PHL → IAD Jul 18, 23:40 UTCJul 19, 00:15 UTC35m
2026-07-18 UAL109 PHL → IAD Jul 18, 23:44 UTCJul 19, 00:10 UTC26m
2026-07-18 UAL109 PHL → PHL Jul 18, 21:55 UTCJul 18, 22:00 UTC5m
2026-07-18 UAL109 - Jul 18, 11:50 UTCJul 18, 21:00 UTC9h 10m
2026-07-18 UAL109 MUC → PHL Jul 18, 10:39 UTCJul 18, 20:55 UTC10h 16m
2026-07-17 UAL108 IAD → MUC Jul 17, 21:53 UTCJul 18, 06:06 UTC8h 13m
2026-07-17 UAL108 - Jul 17, 22:25 UTCJul 18, 00:25 UTC2h 0m
2026-07-17 UAL344 - Jul 17, 05:04 UTCJul 17, 10:00 UTC4h 55m
2026-07-17 UAL344 - Jul 17, 01:35 UTCJul 17, 01:49 UTC15m
2026-07-16 UAL345 - Jul 16, 13:00 UTCJul 16, 22:15 UTC9h 15m
2026-07-16 UAL344 - Jul 16, 01:40 UTCJul 16, 10:10 UTC8h 30m
2026-07-15 UAL345 - Jul 15, 13:55 UTCJul 15, 23:00 UTC9h 5m
2026-07-15 UAL997 - Jul 15, 08:00 UTCJul 15, 08:45 UTC45m
2026-07-14 UAL997 ACC → IAD Jul 14, 22:38 UTCJul 15, 08:56 UTC10h 18m
2026-07-13 UAL996 - Jul 13, 23:10 UTCJul 14, 06:40 UTC7h 30m
2026-07-13 UAL983 ATH → IAD Jul 13, 10:45 UTCJul 13, 20:50 UTC10h 5m
2026-07-12 UAL982 IAD → ATH Jul 12, 22:50 UTCJul 13, 08:15 UTC9h 25m
2026-07-12 UAL983 ATH → IAD Jul 12, 09:05 UTCJul 12, 19:17 UTC10h 12m
2026-07-12 UAL983 ATH → IAD Jul 12, 09:25 UTCJul 12, 19:15 UTC9h 50m
2026-07-11 UAL982 IAD → ATH Jul 11, 21:40 UTCJul 12, 06:50 UTC9h 10m
2026-07-11 UAL613 - Jul 11, 01:30 UTCJul 11, 09:25 UTC7h 55m
2026-07-10 UAL613 - Jul 10, 11:05 UTCJul 11, 09:25 UTC22h 20m
2026-07-10 UAL613 - Jul 10, 10:35 UTCJul 11, 09:00 UTC22h 25m
2026-07-10 UAL612 - Jul 10, 03:30 UTCJul 10, 11:30 UTC8h 0m
2026-07-10 UAL612 IAD → LOS Jul 10, 03:23 UTCJul 10, 14:01 UTC10h 38m
2026-07-09 UAL3907 - Jul 9, 23:40 UTCJul 10, 01:00 UTC1h 20m
2026-07-08 UAL770 BCN → ORD Jul 8, 13:41 UTCJul 8, 21:59 UTC8h 18m
2026-07-08 UAL770 BCN → ORD Jul 8, 13:30 UTCJul 8, 22:15 UTC8h 45m

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 N27908 page for operator, model, and routing details .

Mode-S A2CA64 frequently asked

What is Mode-S code A2CA64?
A2CA64 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27908.
Where is Mode-S A2CA64 registered?
Mode-S code A2CA64 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 A2CA64 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2CA64, octal 50545144, decimal 10,668,644.
What flights does A2CA64 operate?
Mode-S A2CA64 has broadcast 20 distinct callsigns, including UAL770, UAL769, UAL952, UAL908, UAL109.