Apparatus

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sensors Mode-S transponder

A330A0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N30401 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A330A0
Octal
50630240
Decimal
10,694,816
Country
US
Tail
N30401
Type
B739
Broadcasting now · callsign UAL2196 · 31,975 ft
Flights observed
484
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:45 UTC

Current position

A330A0 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A330A0 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
UAL2406 - 19 2026-07-16
UAL1345 United Airlines 16 2026-07-26
UAL2310 - 15 2026-07-16
UAL1872 United Airlines 13 2026-07-21
UAL491 United Airlines 11 2026-07-26
UAL2662 - 11 2026-07-20
UAL2105 United Airlines 11 2026-07-26
UAL1950 United Airlines 11 2026-07-19
UAL1885 - 11 2026-07-17
UAL1563 United Airlines 11 2026-07-20
UAL2170 - 10 2026-06-16
UAL2124 United Airlines 10 2026-07-22
UAL1936 United Airlines 10 2026-07-20
UAL1752 - 10 2026-07-18
UAL1571 - 10 2026-06-14
UAL1696 - 9 2026-07-22
UAL678 - 8 2026-07-19
UAL1507 - 8 2026-07-16
UAL284 United Airlines 7 2026-05-11
UAL2491 - 7 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1345 MIA → EWR Jul 26, 17:45 UTCJul 26, 19:45 UTC2h 0m
2026-07-26 UAL2105 SAT → IAH Jul 26, 15:05 UTCJul 26, 15:55 UTC50m
2026-07-26 UAL491 BZN → DEN Jul 26, 12:50 UTCJul 26, 13:35 UTC45m
2026-07-25 UAL2105 SAT → IAH Jul 25, 15:45 UTCJul 25, 16:35 UTC50m
2026-07-25 UAL2105 SAT → IAH Jul 25, 15:43 UTCJul 25, 16:31 UTC48m
2026-07-25 UAL491 BZN → DEN Jul 25, 12:50 UTCJul 25, 13:40 UTC50m
2026-07-24 UAL1949 ORD → DCA Jul 24, 20:25 UTCJul 25, 00:00 UTC3h 35m
2026-07-24 UAL2773 HNL → ORD Jul 24, 15:20 UTCJul 24, 18:40 UTC3h 20m
2026-07-24 UAL2773 HNL → ORD Jul 24, 15:24 UTCJul 24, 18:37 UTC3h 13m
2026-07-24 UAL396 HNL → SFO Jul 24, 11:45 UTCJul 24, 13:20 UTC1h 35m
2026-07-24 UAL1326 SFO → BNA Jul 24, 02:25 UTCJul 24, 03:55 UTC1h 30m
2026-07-23 UAL1927 ORD → EWR Jul 23, 20:15 UTCJul 24, 00:25 UTC4h 10m
2026-07-23 UAL740 SEA → DEN Jul 23, 15:05 UTCJul 23, 18:45 UTC3h 40m
2026-07-22 UAL2237 ORD → EWR Jul 22, 19:25 UTCJul 22, 22:10 UTC2h 45m
2026-07-22 UAL2491 - Jul 22, 14:50 UTCJul 22, 17:25 UTC2h 35m
2026-07-22 UAL2124 PDX → SFO Jul 22, 12:30 UTCJul 22, 13:20 UTC50m
2026-07-22 UAL1696 - Jul 22, 01:50 UTCJul 22, 03:00 UTC1h 10m
2026-07-21 UAL1949 ORD → DCA Jul 21, 20:25 UTCJul 22, 00:00 UTC3h 35m
2026-07-21 UAL2773 HNL → ORD Jul 21, 15:25 UTCJul 21, 18:40 UTC3h 15m
2026-07-21 UAL1872 DEN → AUS Jul 21, 01:15 UTCJul 21, 03:10 UTC1h 55m
2026-07-20 UAL2662 SAV → MCO Jul 20, 21:55 UTCJul 20, 22:45 UTC50m
2026-07-20 UAL2662 SAV → MCO Jul 20, 21:31 UTCJul 20, 22:41 UTC1h 10m
2026-07-20 UAL2662 - Jul 20, 17:40 UTCJul 20, 20:20 UTC2h 40m
2026-07-20 UAL1936 SAV → EWR Jul 20, 13:05 UTCJul 20, 15:55 UTC2h 50m
2026-07-20 UAL1563 LIH → SFO Jul 20, 02:05 UTCJul 20, 04:45 UTC2h 40m
2026-07-20 UAL1563 LIH → SFO Jul 20, 01:58 UTCJul 20, 04:45 UTC2h 47m
2026-07-19 UAL1927 - Jul 19, 20:15 UTCJul 20, 00:00 UTC3h 45m
2026-07-19 UAL1927 PDX → IAH Jul 19, 20:12 UTCJul 19, 23:51 UTC3h 39m
2026-07-19 UAL740 SEA → DEN Jul 19, 14:50 UTCJul 19, 18:35 UTC3h 45m
2026-07-19 UAL678 - Jul 19, 12:15 UTCJul 19, 13:15 UTC1h 0m
2026-07-19 UAL1950 KOA → SFO Jul 19, 01:40 UTCJul 19, 02:20 UTC40m
2026-07-18 UAL1444 - Jul 18, 21:40 UTCJul 19, 00:05 UTC2h 25m
2026-07-18 UAL315 FLL → IAD Jul 18, 17:45 UTCJul 18, 20:05 UTC2h 20m
2026-07-18 UAL2827 - Jul 18, 15:35 UTCJul 18, 16:20 UTC45m
2026-07-18 UAL2250 - Jul 18, 13:40 UTCJul 18, 14:10 UTC30m
2026-07-18 UAL1752 - Jul 18, 00:10 UTCJul 18, 03:05 UTC2h 56m
2026-07-17 UAL1345 - Jul 17, 18:44 UTCJul 17, 21:10 UTC2h 25m
2026-07-17 UAL1345 - Jul 17, 18:35 UTCJul 17, 21:06 UTC2h 31m
2026-07-17 UAL2105 - Jul 17, 14:55 UTCJul 17, 15:49 UTC55m
2026-07-17 UAL2105 MSY → IAH Jul 17, 15:06 UTCJul 17, 15:48 UTC42m
2026-07-17 UAL491 - Jul 17, 12:50 UTCJul 17, 13:40 UTC50m
2026-07-17 UAL1885 - Jul 17, 02:15 UTCJul 17, 04:25 UTC2h 10m
2026-07-17 UAL1885 PHX → IAH Jul 17, 02:04 UTCJul 17, 04:24 UTC2h 20m
2026-07-16 UAL1507 - Jul 16, 22:10 UTCJul 17, 00:35 UTC2h 25m
2026-07-16 UAL2406 - Jul 16, 18:25 UTCJul 16, 20:19 UTC1h 55m
2026-07-16 UAL2310 - Jul 16, 14:45 UTCJul 16, 16:40 UTC1h 55m
2026-07-16 UAL1898 - Jul 16, 10:10 UTCJul 16, 12:49 UTC2h 40m
2026-07-16 UAL1795 - Jul 16, 00:25 UTCJul 16, 03:05 UTC2h 40m
2026-07-15 UAL2237 - Jul 15, 19:50 UTCJul 15, 22:35 UTC2h 45m
2026-07-15 UAL2491 - Jul 15, 15:35 UTCJul 15, 18:40 UTC3h 5m

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 N30401 page for operator, model, and routing details .

Mode-S A330A0 frequently asked

What is Mode-S code A330A0?
A330A0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N30401.
Where is Mode-S A330A0 registered?
Mode-S code A330A0 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 A330A0 broadcasting right now?
Yes. Mode-S A330A0 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A330A0, octal 50630240, decimal 10,694,816.
What flights does A330A0 operate?
Mode-S A330A0 has broadcast 20 distinct callsigns, including UAL2406, UAL1345, UAL2310, UAL1872, UAL491.