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
No current signal · last broadcast 1h ago
Flights observed
426
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A330A0.

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 - 18 2026-07-04
UAL2310 - 14 2026-07-04
UAL1345 - 13 2026-06-25
UAL2170 - 10 2026-06-16
UAL1950 - 10 2026-07-12
UAL1872 - 10 2026-07-06
UAL1571 - 10 2026-06-14
UAL1885 United Airlines 9 2026-06-20
UAL1752 - 9 2026-06-25
UAL1563 - 9 2026-07-14
UAL491 - 8 2026-07-10
UAL2124 - 8 2026-07-04
UAL1936 United Airlines 8 2026-07-06
UAL678 - 7 2026-07-12
UAL284 United Airlines 7 2026-05-11
UAL2662 United Airlines 7 2026-07-06
UAL2390 United Airlines 7 2026-05-11
UAL2253 - 7 2026-07-08
UAL2215 - 7 2026-07-03
UAL1507 - 7 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1563 - Jul 14, 03:20 UTCJul 14, 06:00 UTC2h 40m
2026-07-13 UAL2341 - Jul 13, 23:30 UTCJul 14, 00:20 UTC50m
2026-07-13 UAL1493 - Jul 13, 20:20 UTCJul 13, 21:10 UTC50m
2026-07-13 UAL1493 IAH → MSY Jul 13, 20:27 UTCJul 13, 21:08 UTC41m
2026-07-13 UAL2863 SMF → IAH Jul 13, 12:27 UTCJul 13, 15:47 UTC3h 20m
2026-07-13 UAL2863 - Jul 13, 12:25 UTCJul 13, 16:00 UTC3h 35m
2026-07-13 UAL1148 - Jul 13, 01:55 UTCJul 13, 05:20 UTC3h 25m
2026-07-12 UAL1927 - Jul 12, 20:10 UTCJul 13, 00:15 UTC4h 5m
2026-07-12 UAL740 - Jul 12, 14:50 UTCJul 12, 18:35 UTC3h 45m
2026-07-12 UAL678 - Jul 12, 12:20 UTCJul 12, 13:10 UTC50m
2026-07-12 UAL1950 - Jul 12, 01:50 UTCJul 12, 02:35 UTC45m
2026-07-11 UAL2078 - Jul 11, 20:20 UTCJul 11, 23:45 UTC3h 25m
2026-07-11 UAL1882 - Jul 11, 15:40 UTCJul 11, 18:50 UTC3h 10m
2026-07-11 UAL1702 - Jul 11, 03:35 UTCJul 11, 07:05 UTC3h 30m
2026-07-10 UAL589 - Jul 10, 22:25 UTCJul 11, 01:55 UTC3h 30m
2026-07-10 UAL2105 - Jul 10, 19:30 UTCJul 10, 20:30 UTC1h 0m
2026-07-10 UAL491 - Jul 10, 12:55 UTCJul 10, 13:40 UTC45m
2026-07-10 UAL491 IAH → MSY Jul 10, 12:49 UTCJul 10, 13:35 UTC46m
2026-07-09 UAL2449 - Jul 9, 23:50 UTCJul 10, 02:30 UTC2h 40m
2026-07-09 UAL1971 - Jul 9, 19:45 UTCJul 9, 22:20 UTC2h 35m
2026-07-09 UAL1971 IAH → LAS Jul 9, 19:42 UTCJul 9, 22:19 UTC2h 37m
2026-07-09 UAL2812 - Jul 9, 16:10 UTCJul 9, 18:20 UTC2h 10m
2026-07-09 UAL2078 BOS → ORD Jul 9, 01:05 UTCJul 9, 03:20 UTC2h 15m
2026-07-08 UAL1609 - Jul 8, 22:45 UTCJul 8, 23:25 UTC40m
2026-07-08 UAL1388 - Jul 8, 20:00 UTCJul 8, 20:45 UTC45m
2026-07-08 UAL2253 - Jul 8, 17:25 UTCJul 8, 18:15 UTC50m
2026-07-08 UAL575 BOS → ORD Jul 8, 15:05 UTCJul 8, 15:55 UTC50m
2026-07-08 UAL575 BOS → ORD Jul 8, 15:05 UTCJul 8, 15:50 UTC45m
2026-07-08 UAL678 - Jul 8, 12:15 UTCJul 8, 13:10 UTC55m
2026-07-08 UAL1950 - Jul 8, 02:10 UTCJul 8, 03:00 UTC50m
2026-07-08 UAL1950 IAH → MFE Jul 8, 01:50 UTCJul 8, 03:12 UTC1h 22m
2026-07-07 UAL1949 - Jul 7, 20:30 UTCJul 7, 23:40 UTC3h 10m
2026-07-07 UAL2773 - Jul 7, 15:15 UTCJul 7, 18:40 UTC3h 25m
2026-07-07 UAL396 - Jul 7, 11:50 UTCJul 7, 13:30 UTC1h 40m
2026-07-07 UAL1326 - Jul 7, 01:50 UTCJul 7, 03:30 UTC1h 40m
2026-07-06 UAL1872 - Jul 6, 22:25 UTCJul 7, 00:20 UTC1h 55m
2026-07-06 UAL2662 DEN → PDX Jul 6, 17:55 UTCJul 6, 20:00 UTC2h 5m
2026-07-06 UAL1936 SAV → EWR Jul 6, 13:00 UTCJul 6, 15:40 UTC2h 40m
2026-07-06 UAL1563 - Jul 6, 02:55 UTCJul 6, 05:40 UTC2h 45m
2026-07-05 UAL1949 - Jul 5, 20:25 UTCJul 5, 23:45 UTC3h 20m
2026-07-05 UAL2773 - Jul 5, 15:20 UTCJul 5, 18:45 UTC3h 25m
2026-07-05 UAL2399 - Jul 5, 11:30 UTCJul 5, 13:10 UTC1h 40m
2026-07-04 UAL2846 - Jul 4, 22:15 UTCJul 5, 00:00 UTC1h 45m
2026-07-04 UAL2406 - Jul 4, 18:30 UTCJul 4, 20:00 UTC1h 30m
2026-07-04 UAL2406 MCO → IAH Jul 4, 18:31 UTCJul 4, 20:20 UTC1h 49m
2026-07-04 UAL2310 - Jul 4, 14:50 UTCJul 4, 16:50 UTC2h 0m
2026-07-04 UAL2310 IAH → MCO Jul 4, 14:55 UTCJul 4, 16:46 UTC1h 51m
2026-07-04 UAL2124 - Jul 4, 12:15 UTCJul 4, 13:10 UTC55m
2026-07-04 UAL1696 SFO → RNO Jul 4, 01:45 UTCJul 4, 02:40 UTC55m
2026-07-03 UAL1609 - Jul 3, 23:15 UTCJul 3, 23:55 UTC40m

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?
No active broadcast right now. Last signal was 1h ago.
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, UAL2310, UAL1345, UAL2170, UAL1950.