sensors Mode-S transponder

A2A3D2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N26970 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC

Hex
A2A3D2
Octal
50521722
Decimal
10,658,770
Country
US
Tail
N26970
Type
B789
Broadcasting now · callsign UAL820 · 3,600 ft
Flights observed
219
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 15:15 UTC

Current position

A2A3D2 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2A3D2 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 - 21 2026-07-13
UAL821 - 20 2026-07-13
UAL198 United Airlines 16 2026-07-25
UAL199 United Airlines 12 2026-07-03
UAL153 United Airlines 12 2026-07-25
UAL152 United Airlines 9 2026-07-24
UAL761 United Airlines 8 2026-04-16
UAL760 United Airlines 7 2026-04-16
UAL2096 United Airlines 7 2026-07-07
UAL842 - 6 2026-06-25
UAL143 - 6 2026-07-19
UAL188 United Airlines 5 2026-05-02
UAL187 United Airlines 5 2026-05-02
UAL177 - 5 2026-04-13
UAL839 - 4 2026-06-19
UAL771 - 4 2026-07-10
UAL353 - 4 2026-07-07
UAL263 United Airlines 4 2026-04-14
UAL78 United Airlines 3 2026-04-21
UAL772 - 3 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UAL198 LAX → PVG Jul 25, 21:15 UTCJul 26, 15:15 UTC18h 1m
2026-07-25 UAL153 HKG → LAX Jul 25, 07:45 UTCJul 25, 18:55 UTC11h 10m
2026-07-25 UAL153 HKG → LAX Jul 25, 05:35 UTCJul 25, 05:50 UTC15m
2026-07-24 UAL152 LAX → HKG Jul 24, 13:00 UTCJul 24, 13:15 UTC15m
2026-07-23 UAL152 LAX → HKG Jul 23, 20:30 UTCJul 24, 10:05 UTC13h 35m
2026-07-23 UAL33 NRT → LAX Jul 23, 08:10 UTCJul 23, 17:50 UTC9h 40m
2026-07-22 UAL7 IAH → NRT Jul 22, 16:40 UTCJul 23, 05:05 UTC12h 25m
2026-07-22 UAL63 GRU → IAH Jul 22, 01:00 UTCJul 22, 05:05 UTC4h 5m
2026-07-21 UAL62 IAH → GRU Jul 21, 00:35 UTCJul 21, 09:40 UTC9h 5m
2026-07-20 UAL6 NRT → IAH Jul 20, 10:05 UTCJul 20, 21:50 UTC11h 45m
2026-07-19 UAL143 - Jul 19, 20:10 UTCJul 20, 07:20 UTC11h 10m
2026-07-19 UAL142 - Jul 19, 07:55 UTCJul 19, 18:00 UTC10h 5m
2026-07-18 UAL7 IAH → NRT Jul 18, 16:10 UTCJul 19, 04:40 UTC12h 30m
2026-07-18 UAL63 GRU → IAH Jul 18, 01:05 UTCJul 18, 10:25 UTC9h 21m
2026-07-17 UAL62 - Jul 17, 00:25 UTCJul 17, 09:55 UTC9h 30m
2026-07-16 UAL6 - Jul 16, 08:20 UTCJul 16, 20:09 UTC11h 50m
2026-07-15 UAL32 - Jul 15, 18:25 UTCJul 16, 04:55 UTC10h 30m
2026-07-14 UAL99 MEL → LAX Jul 14, 23:54 UTCJul 15, 13:46 UTC13h 52m
2026-07-14 UAL99 - Jul 14, 23:50 UTCJul 15, 01:40 UTC1h 50m
2026-07-14 UAL98 - Jul 14, 06:25 UTCJul 14, 21:40 UTC15h 15m
2026-07-13 UAL821 - Jul 13, 14:05 UTCJul 14, 03:15 UTC13h 10m
2026-07-13 UAL821 - Jul 13, 11:15 UTCJul 13, 11:20 UTC5m
2026-07-13 UAL821 - Jul 13, 09:10 UTCJul 13, 09:20 UTC10m
2026-07-13 UAL821 BKK → HKG Jul 13, 09:05 UTCJul 13, 11:20 UTC2h 15m
2026-07-13 UAL820 - Jul 13, 02:15 UTCJul 13, 02:35 UTC20m
2026-07-13 UAL820 - Jul 13, 00:25 UTCJul 13, 00:35 UTC10m
2026-07-12 UAL820 - Jul 12, 21:50 UTCJul 12, 22:15 UTC25m
2026-07-12 UAL820 - Jul 12, 08:15 UTCJul 12, 21:15 UTC13h 0m
2026-07-11 UAL772 - Jul 11, 05:10 UTCJul 11, 16:00 UTC10h 50m
2026-07-10 UAL771 - Jul 10, 07:20 UTCJul 10, 19:25 UTC12h 5m
2026-07-10 UAL771 LAX → PEK Jul 10, 07:08 UTCJul 10, 20:32 UTC13h 24m
2026-07-09 UAL821 HKG → LAX Jul 9, 14:06 UTCJul 10, 03:02 UTC12h 56m
2026-07-09 UAL821 HKG → LAX Jul 9, 14:00 UTCJul 10, 03:05 UTC13h 5m
2026-07-09 UAL821 - Jul 9, 11:05 UTCJul 9, 11:25 UTC20m
2026-07-09 UAL821 - Jul 9, 09:00 UTCJul 9, 09:30 UTC30m
2026-07-09 UAL820 HKG → BKK Jul 9, 00:01 UTCJul 9, 02:08 UTC2h 7m
2026-07-08 UAL820 HKG → BKK Jul 8, 23:55 UTCJul 9, 02:10 UTC2h 15m
2026-07-08 UAL820 - Jul 8, 07:20 UTCJul 8, 21:15 UTC13h 55m
2026-07-08 UAL820 LAX → HKG Jul 8, 07:20 UTCJul 8, 21:09 UTC13h 49m
2026-07-07 UAL353 - Jul 7, 23:10 UTCJul 8, 04:00 UTC4h 50m
2026-07-07 UAL2096 LAX → EWR Jul 7, 15:50 UTCJul 7, 20:30 UTC4h 40m
2026-07-06 UAL353T EWR → LAX Jul 6, 23:19 UTCJul 7, 04:19 UTC5h 0m
2026-07-06 UAL353T - Jul 6, 23:25 UTCJul 7, 04:25 UTC5h 0m
2026-07-06 UAL2096 LAX → EWR Jul 6, 15:55 UTCJul 6, 20:50 UTC4h 55m
2026-07-05 UAL821 - Jul 5, 15:00 UTCJul 6, 02:55 UTC11h 55m
2026-07-05 UAL821 - Jul 5, 14:15 UTCJul 5, 14:30 UTC15m
2026-07-05 UAL821 - Jul 5, 11:15 UTCJul 5, 11:35 UTC20m
2026-07-05 UAL821 - Jul 5, 09:00 UTCJul 5, 09:40 UTC40m
2026-07-05 UAL820 - Jul 5, 01:25 UTCJul 5, 02:10 UTC45m
2026-07-05 UAL820 HKG → BKK Jul 5, 00:01 UTCJul 5, 02:07 UTC2h 6m

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 N26970 page for operator, model, and routing details .

Mode-S A2A3D2 frequently asked

What is Mode-S code A2A3D2?
A2A3D2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N26970.
Where is Mode-S A2A3D2 registered?
Mode-S code A2A3D2 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 A2A3D2 broadcasting right now?
Yes. Mode-S A2A3D2 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2A3D2, octal 50521722, decimal 10,658,770.
What flights does A2A3D2 operate?
Mode-S A2A3D2 has broadcast 20 distinct callsigns, including UAL820, UAL821, UAL198, UAL199, UAL153.