sensors Mode-S transponder

A2A3B5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N26966 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC

Hex
A2A3B5
Octal
50521665
Decimal
10,658,741
Country
US
Tail
N26966
Type
B789
No current signal · last broadcast Jul 26, 18:55 UTC
Flights observed
246
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:55 UTC

Last known position

Most recent position reported by Mode-S A2A3B5.

Country allocation

The ICAO 24-bit address A2A3B5 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
UAL842 - 11 2026-07-16
UAL153 United Airlines 11 2026-06-27
UAL152 United Airlines 11 2026-06-26
UAL839 - 10 2026-07-02
UAL199 United Airlines 8 2026-06-10
UAL198 United Airlines 8 2026-06-09
UAL187 United Airlines 8 2026-07-20
UAL142 United Airlines 8 2026-06-19
UAL761 United Airlines 7 2026-06-22
UAL33 - 7 2026-06-25
UAL32 - 7 2026-06-15
UAL182 United Airlines 7 2026-05-30
UAL98 United Airlines 6 2026-05-23
UAL99 United Airlines 5 2026-05-24
UAL7 - 5 2026-06-24
UAL63 - 5 2026-06-18
UAL6 - 5 2026-06-16
UAL263 - 5 2026-06-21
UAL262 - 5 2026-06-21
UAL2096 - 5 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL805 SFO → ICN Jul 26, 07:26 UTCJul 26, 18:51 UTC11h 25m
2026-07-26 UAL805 SFO → ICN Jul 26, 07:15 UTCJul 26, 17:15 UTC10h 0m
2026-07-25 UAL28 SIN → SFO Jul 25, 14:35 UTCJul 26, 04:35 UTC14h 0m
2026-07-25 UAL28 SIN → SFO Jul 25, 13:16 UTCJul 26, 04:30 UTC15h 14m
2026-07-24 UAL29 SFO → SIN Jul 24, 18:45 UTCJul 25, 10:43 UTC15h 58m
2026-07-24 UAL29 SFO → SIN Jul 24, 19:10 UTCJul 25, 09:15 UTC14h 5m
2026-07-23 UAL949 LHR → SFO Jul 23, 13:05 UTCJul 23, 23:35 UTC10h 30m
2026-07-23 UAL948 SFO → LHR Jul 23, 01:30 UTCJul 23, 10:55 UTC9h 25m
2026-07-22 UAL949 LHR → SFO Jul 22, 12:45 UTCJul 22, 23:10 UTC10h 25m
2026-07-22 UAL122 IAD → LHR Jul 22, 00:54 UTCJul 22, 06:50 UTC5h 56m
2026-07-22 UAL122 IAD → LHR Jul 22, 00:35 UTCJul 22, 02:25 UTC1h 50m
2026-07-20 UAL187 JNB → EWR Jul 20, 20:25 UTCJul 21, 11:25 UTC15h 0m
2026-07-20 UAL187 JNB → EWR Jul 20, 20:19 UTCJul 21, 11:24 UTC15h 5m
2026-07-20 UAL188 EWR → JNB Jul 20, 02:50 UTCJul 20, 17:10 UTC14h 20m
2026-07-18 UAL83 DEL → EWR Jul 18, 18:35 UTCJul 19, 10:20 UTC15h 45m
2026-07-18 UAL82 EWR → DEL Jul 18, 02:14 UTCJul 18, 16:20 UTC14h 6m
2026-07-17 UAL2096 - Jul 17, 16:15 UTCJul 17, 20:50 UTC4h 35m
2026-07-16 UAL842 - Jul 16, 23:59 UTCJul 17, 00:35 UTC35m
2026-07-16 UAL842 SYD → LAX Jul 16, 23:51 UTCJul 17, 13:10 UTC13h 19m
2026-07-16 UAL842 SYD → LAX Jul 16, 23:51 UTCJul 17, 12:58 UTC13h 7m
2026-07-16 UAL863 SFO → SYD Jul 16, 06:25 UTCJul 16, 20:55 UTC14h 30m
2026-07-15 UAL1757 - Jul 15, 22:20 UTCJul 16, 03:25 UTC5h 5m
2026-07-14 UAL2023 CPT → IAD Jul 14, 18:10 UTCJul 15, 08:35 UTC14h 24m
2026-07-14 UAL1011 - Jul 14, 13:50 UTCJul 14, 14:00 UTC10m
2026-07-13 UAL1011 - Jul 13, 23:50 UTCJul 14, 00:35 UTC45m
2026-07-12 UAL2023 CPT → IAD Jul 12, 18:01 UTCJul 13, 09:05 UTC15h 5m
2026-07-12 UAL1011 - Jul 12, 12:50 UTCJul 12, 13:05 UTC15m
2026-07-11 UAL1011 - Jul 11, 22:55 UTCJul 12, 06:35 UTC7h 40m
2026-07-11 UAL1849 SFO → IAD Jul 11, 15:35 UTCJul 11, 20:05 UTC4h 30m
2026-07-10 UAL806 ICN → SFO Jul 10, 02:56 UTCJul 10, 12:54 UTC9h 58m
2026-07-10 UAL806 - Jul 10, 02:40 UTCJul 10, 03:10 UTC30m
2026-07-09 UAL805 SFO → ICN Jul 9, 07:42 UTCJul 9, 19:11 UTC11h 29m
2026-07-09 UAL805 SFO → ICN Jul 9, 07:40 UTCJul 9, 19:15 UTC11h 35m
2026-07-08 UAL949 - Jul 8, 12:30 UTCJul 8, 22:45 UTC10h 15m
2026-07-08 UAL949 LHR → SFO Jul 8, 12:25 UTCJul 8, 22:46 UTC10h 21m
2026-07-08 UAL948 SFO → LHR Jul 8, 00:34 UTCJul 8, 10:11 UTC9h 37m
2026-07-08 UAL948 - Jul 8, 00:40 UTCJul 8, 10:20 UTC9h 40m
2026-07-06 UAL1593 - Jul 6, 14:30 UTCJul 6, 19:35 UTC5h 5m
2026-07-06 UAL1141 SFO → EWR Jul 6, 06:00 UTCJul 6, 10:35 UTC4h 35m
2026-07-05 UAL969 - Jul 5, 13:15 UTCJul 6, 00:00 UTC10h 45m
2026-07-04 UAL968 SFO → AMS Jul 4, 22:10 UTCJul 5, 07:55 UTC9h 45m
2026-07-04 UAL892 - Jul 4, 08:15 UTCJul 4, 18:20 UTC10h 5m
2026-07-03 UAL893 SFO → ICN Jul 3, 18:10 UTCJul 4, 06:04 UTC11h 54m
2026-07-03 UAL893 SFO → ICN Jul 3, 18:30 UTCJul 4, 06:10 UTC11h 40m
2026-07-03 UAL870 - Jul 3, 00:55 UTCJul 3, 14:00 UTC13h 5m
2026-07-02 UAL839 LAX → SYD Jul 2, 06:44 UTCJul 2, 20:46 UTC14h 2m
2026-07-02 UAL839 - Jul 2, 06:41 UTCJul 2, 21:05 UTC14h 24m
2026-07-01 UAL935 - Jul 1, 12:30 UTCJul 1, 13:15 UTC45m
2026-07-01 UAL935 LHR → LAX Jul 1, 12:30 UTCJul 1, 22:38 UTC10h 8m
2026-06-30 UAL923 - Jun 30, 23:25 UTCJul 1, 08:45 UTC9h 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 N26966 page for operator, model, and routing details .

Mode-S A2A3B5 frequently asked

What is Mode-S code A2A3B5?
A2A3B5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N26966.
Where is Mode-S A2A3B5 registered?
Mode-S code A2A3B5 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 A2A3B5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2A3B5, octal 50521665, decimal 10,658,741.
What flights does A2A3B5 operate?
Mode-S A2A3B5 has broadcast 20 distinct callsigns, including UAL842, UAL153, UAL152, UAL839, UAL199.