Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A2CB33

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27965 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC

Hex
A2CB33
Octal
50545463
Decimal
10,668,851
Country
US
Tail
N27965
Type
B789
No current signal · last broadcast 3h ago
Flights observed
136
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A2CB33.

Country allocation

The ICAO 24-bit address A2CB33 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
UAL820 - 8 2026-07-04
UAL821 - 7 2026-07-04
UAL188 United Airlines 7 2026-07-01
UAL29 United Airlines 6 2026-05-07
UAL187 - 6 2026-07-01
UAL2303 United Airlines 5 2026-05-30
UAL893 United Airlines 4 2026-05-14
UAL863 United Airlines 4 2026-05-17
UAL353 - 4 2026-07-03
UAL28 United Airlines 4 2026-05-08
UAL2679 United Airlines 4 2026-04-13
UAL2096 United Airlines 4 2026-06-14
UAL152 United Airlines 4 2026-06-10
UAL114 United Airlines 4 2026-05-16
UAL949 - 3 2026-07-12
UAL948 - 3 2026-07-14
UAL923 - 3 2026-07-09
UAL892 United Airlines 3 2026-05-15
UAL870 United Airlines 3 2026-05-14
UAL3042 United Airlines 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL948 - Jul 14, 00:30 UTCJul 14, 03:10 UTC2h 40m
2026-07-12 UAL949 LHR → SFO Jul 12, 12:25 UTCJul 12, 23:27 UTC11h 2m
2026-07-12 UAL949 - Jul 12, 13:05 UTCJul 12, 23:30 UTC10h 25m
2026-07-12 UAL948 SFO → LHR Jul 12, 00:34 UTCJul 12, 10:01 UTC9h 27m
2026-07-12 UAL948 SFO → LHR Jul 12, 00:35 UTCJul 12, 10:05 UTC9h 30m
2026-07-10 UAL949 - Jul 10, 12:40 UTCJul 10, 23:05 UTC10h 25m
2026-07-09 UAL923 - Jul 9, 22:55 UTCJul 10, 08:45 UTC9h 50m
2026-07-09 UAL923 LAX → LHR Jul 9, 22:53 UTCJul 10, 08:47 UTC9h 54m
2026-07-09 UAL2692 - Jul 9, 14:05 UTCJul 9, 18:45 UTC4h 40m
2026-07-06 UAL1855 - Jul 6, 21:25 UTCJul 7, 02:10 UTC4h 45m
2026-07-06 UAL772 - Jul 6, 05:20 UTCJul 6, 15:50 UTC10h 30m
2026-07-06 UAL772 PEK → LAX Jul 6, 04:29 UTCJul 6, 15:53 UTC11h 24m
2026-07-05 UAL771 - Jul 5, 07:25 UTCJul 5, 08:20 UTC55m
2026-07-05 UAL771 LAX → PEK Jul 5, 07:09 UTCJul 5, 20:52 UTC13h 43m
2026-07-04 UAL821 HKG → LAX Jul 4, 14:06 UTCJul 5, 03:08 UTC13h 2m
2026-07-04 UAL821 - Jul 4, 14:25 UTCJul 5, 03:10 UTC12h 45m
2026-07-04 UAL821 - Jul 4, 09:05 UTCJul 4, 09:35 UTC30m
2026-07-04 UAL821 BKK → HKG Jul 4, 09:05 UTCJul 4, 11:35 UTC2h 30m
2026-07-04 UAL820 - Jul 4, 04:20 UTCJul 4, 04:30 UTC10m
2026-07-04 UAL820 - Jul 4, 01:40 UTCJul 4, 02:00 UTC20m
2026-07-04 UAL820 HKG → BKK Jul 4, 00:51 UTCJul 4, 04:15 UTC3h 24m
2026-07-03 UAL820 - Jul 3, 09:15 UTCJul 3, 22:55 UTC13h 40m
2026-07-03 UAL353 EWR → LAX Jul 3, 01:49 UTCJul 3, 07:00 UTC5h 11m
2026-07-03 UAL353 - Jul 3, 02:05 UTCJul 3, 07:05 UTC5h 0m
2026-07-01 UAL187 - Jul 1, 20:15 UTCJul 2, 11:20 UTC15h 5m
2026-07-01 UAL188 EWR → JNB Jul 1, 01:54 UTCJul 1, 15:34 UTC13h 40m
2026-07-01 UAL188 EWR → JNB Jul 1, 01:50 UTCJul 1, 02:20 UTC30m
2026-06-17 UAL187 - Jun 17, 21:00 UTCJun 18, 12:35 UTC15h 35m
2026-06-17 UAL188 EWR → JNB Jun 17, 01:54 UTCJun 17, 15:57 UTC14h 3m
2026-06-17 UAL188 EWR → JNB Jun 17, 02:00 UTCJun 17, 16:00 UTC14h 0m
2026-06-15 UAL2222 IAD → CPT Jun 15, 18:20 UTCJun 15, 18:25 UTC5m
2026-06-15 UAL2222 CPT → EWR Jun 15, 18:12 UTCJun 16, 08:53 UTC14h 41m
2026-06-15 UAL1122 EWR → CPT Jun 15, 01:30 UTCJun 15, 01:59 UTC30m
2026-06-15 UAL1122 EWR → CPT Jun 15, 01:05 UTCJun 15, 14:55 UTC13h 50m
2026-06-14 UAL2096 LAX → EWR Jun 14, 17:05 UTCJun 14, 21:35 UTC4h 30m
2026-06-13 UAL99 MEL → LAX Jun 13, 23:51 UTCJun 14, 13:35 UTC13h 44m
2026-06-13 UAL99 MEL → LAX Jun 13, 23:45 UTCJun 14, 13:40 UTC13h 55m
2026-06-13 UAL98 LAX → MEL Jun 13, 06:25 UTCJun 13, 21:20 UTC14h 55m
2026-06-12 UAL935 LHR → LAX Jun 12, 12:20 UTCJun 12, 22:30 UTC10h 10m
2026-06-11 UAL923 - Jun 11, 23:00 UTCJun 12, 09:15 UTC10h 15m
2026-06-11 UAL153 HKG → LAX Jun 11, 05:08 UTCJun 11, 17:10 UTC12h 2m
2026-06-11 UAL153 HKG → LAX Jun 11, 04:50 UTCJun 11, 17:15 UTC12h 25m
2026-06-11 UAL153 HKG → LAX Jun 11, 02:20 UTCJun 11, 02:25 UTC5m
2026-06-10 UAL152 LAX → HKG Jun 10, 13:15 UTCJun 10, 13:25 UTC10m
2026-06-10 UAL152 LAX → HKG Jun 10, 12:49 UTCJun 10, 15:10 UTC2h 21m
2026-06-09 UAL152 LAX → HKG Jun 9, 20:15 UTCJun 10, 10:35 UTC14h 20m
2026-06-09 UAL152 LAX → HKG Jun 9, 20:08 UTCJun 10, 10:29 UTC14h 21m
2026-06-08 UAL842 SYD → LAX Jun 8, 23:55 UTCJun 9, 13:10 UTC13h 15m
2026-06-08 UAL839 LAX → SYD Jun 8, 06:05 UTCJun 8, 20:35 UTC14h 30m
2026-06-07 UAL821 SFO → MEX Jun 7, 13:50 UTCJun 8, 02:20 UTC12h 30m

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 N27965 page for operator, model, and routing details .

Mode-S A2CB33 frequently asked

What is Mode-S code A2CB33?
A2CB33 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27965.
Where is Mode-S A2CB33 registered?
Mode-S code A2CB33 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 A2CB33 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2CB33, octal 50545463, decimal 10,668,851.
What flights does A2CB33 operate?
Mode-S A2CB33 has broadcast 20 distinct callsigns, including UAL820, UAL821, UAL188, UAL29, UAL187.