Apparatus

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sensors Mode-S transponder

A1BB45

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N210UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
A1BB45
Octal
50335505
Decimal
10,599,237
Country
US
Tail
N210UA
Type
B772
No current signal · last broadcast 19h ago
Flights observed
242
Distinct callsigns
20
Country
US
Last broadcast
19h ago

Last known position

Most recent position reported by Mode-S A1BB45.

Country allocation

The ICAO 24-bit address A1BB45 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
UAL384 - 38 2026-07-09
UAL1806 - 28 2026-07-13
UAL1805 - 27 2026-07-12
UAL383 - 23 2026-07-09
UAL1736 - 20 2026-07-11
UAL1735 - 17 2026-07-12
UAL252 - 10 2026-06-30
UAL253 - 7 2026-06-30
UAL1170 United Airlines 7 2026-06-07
UAL300 - 6 2026-06-29
UAL2358 United Airlines 6 2026-06-26
UAL1157 United Airlines 6 2026-06-24
UAL1731 United Airlines 5 2026-04-27
UAL2004 United Airlines 4 2026-04-18
UAL1726 United Airlines 4 2026-04-17
UAL1509 United Airlines 4 2026-04-23
UAL2391 United Airlines 3 2026-05-20
UAL1758 United Airlines 3 2026-04-26
UAL1604 United Airlines 3 2026-05-20
UAL604 United Airlines 2 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL1806 - Jul 13, 12:10 UTCJul 13, 14:15 UTC2h 5m
2026-07-13 UAL1806 - Jul 13, 08:01 UTCJul 13, 08:20 UTC20m
2026-07-12 UAL1805 DEN → HNL Jul 12, 22:23 UTCJul 13, 04:54 UTC6h 31m
2026-07-12 UAL1805 - Jul 12, 22:25 UTCJul 13, 04:55 UTC6h 30m
2026-07-12 UAL1735 - Jul 12, 10:05 UTCJul 12, 12:15 UTC2h 10m
2026-07-11 UAL1736 DEN → OGG Jul 11, 18:23 UTCJul 12, 00:32 UTC6h 9m
2026-07-11 UAL1736 - Jul 11, 18:15 UTCJul 11, 20:35 UTC2h 20m
2026-07-09 UAL383 - Jul 9, 06:00 UTCJul 9, 06:15 UTC15m
2026-07-09 UAL383 HNL → DEN Jul 9, 05:58 UTCJul 9, 12:00 UTC6h 2m
2026-07-09 UAL384 - Jul 9, 00:40 UTCJul 9, 01:00 UTC20m
2026-07-08 UAL384 - Jul 8, 18:20 UTCJul 8, 20:40 UTC2h 20m
2026-07-05 UAL1806 - Jul 5, 11:45 UTCJul 5, 14:05 UTC2h 20m
2026-07-05 UAL1806 - Jul 5, 08:00 UTCJul 5, 08:15 UTC15m
2026-07-04 UAL1805 DEN → HNL Jul 4, 22:23 UTCJul 5, 05:06 UTC6h 43m
2026-07-04 UAL1805 DEN → HNL Jul 4, 22:30 UTCJul 5, 05:10 UTC6h 40m
2026-07-04 UAL383 - Jul 4, 06:00 UTCJul 4, 11:50 UTC5h 50m
2026-07-04 UAL384 DEN → HNL Jul 4, 00:40 UTCJul 4, 00:55 UTC15m
2026-07-03 UAL384 DEN → HNL Jul 3, 18:15 UTCJul 3, 20:30 UTC2h 15m
2026-07-03 UAL383 - Jul 3, 06:05 UTCJul 3, 11:55 UTC5h 50m
2026-07-03 UAL384 DEN → HNL Jul 3, 00:45 UTCJul 3, 01:05 UTC20m
2026-07-02 UAL384 DEN → HNL Jul 2, 18:25 UTCJul 2, 20:35 UTC2h 10m
2026-07-01 UAL383 - Jul 1, 06:20 UTCJul 1, 12:30 UTC6h 10m
2026-06-30 UAL253 - Jun 30, 15:35 UTCJun 30, 23:30 UTC7h 55m
2026-06-30 UAL252 - Jun 30, 06:05 UTCJun 30, 06:20 UTC15m
2026-06-30 UAL252 HNL → IAH Jun 30, 06:08 UTCJun 30, 13:01 UTC6h 53m
2026-06-29 UAL253 - Jun 29, 15:39 UTCJun 29, 18:44 UTC3h 5m
2026-06-29 UAL253 IAH → HNL Jun 29, 15:32 UTCJun 29, 23:21 UTC7h 49m
2026-06-29 UAL252 - Jun 29, 06:19 UTCJun 29, 13:30 UTC7h 10m
2026-06-29 UAL300 - Jun 29, 02:05 UTCJun 29, 02:14 UTC10m
2026-06-28 UAL300 SFO → HNL Jun 28, 21:37 UTCJun 29, 02:14 UTC4h 37m
2026-06-28 UAL300 - Jun 28, 21:34 UTCJun 28, 22:04 UTC30m
2026-06-28 UAL1147 IAD → SFO Jun 28, 13:14 UTCJun 28, 18:29 UTC5h 15m
2026-06-27 UAL1791 SFO → IAD Jun 27, 20:34 UTCJun 28, 00:45 UTC4h 10m
2026-06-27 UAL1147 - Jun 27, 13:04 UTCJun 27, 18:15 UTC5h 10m
2026-06-26 UAL8117 YUL → YSJ Jun 26, 21:04 UTCJun 27, 01:24 UTC4h 20m
2026-06-26 UAL2358 SAN → EWR Jun 26, 15:25 UTCJun 26, 18:44 UTC3h 20m
2026-06-26 UAL604 DEN → SYR Jun 26, 08:45 UTCJun 26, 11:55 UTC3h 10m
2026-06-25 UAL1818 - Jun 25, 23:44 UTCJun 26, 04:30 UTC4h 45m
2026-06-25 UAL1818 HNL → SFO Jun 25, 23:45 UTCJun 26, 04:20 UTC4h 35m
2026-06-25 UAL1158 LAX → HNL Jun 25, 16:21 UTCJun 25, 21:36 UTC5h 15m
2026-06-25 UAL1158 - Jun 25, 16:29 UTCJun 25, 21:44 UTC5h 15m
2026-06-24 UAL1157 BOS → IAD Jun 24, 23:59 UTCJun 25, 04:40 UTC4h 40m
2026-06-23 UAL253 - Jun 23, 15:50 UTCJun 23, 23:34 UTC7h 45m
2026-06-23 UAL253 IAH → HNL Jun 23, 15:57 UTCJun 23, 23:31 UTC7h 34m
2026-06-23 UAL252 - Jun 23, 06:04 UTCJun 23, 13:19 UTC7h 15m
2026-06-23 UAL384 DEN → HNL Jun 23, 00:54 UTCJun 23, 01:10 UTC15m
2026-06-22 UAL384 DEN → HNL Jun 22, 18:30 UTCJun 22, 20:55 UTC2h 25m
2026-06-22 UAL384 DEN → HNL Jun 22, 18:30 UTCJun 23, 01:14 UTC6h 44m
2026-06-21 UAL1806 - Jun 21, 08:04 UTCJun 21, 14:05 UTC6h 0m
2026-06-20 UAL1805 DEN → HNL Jun 20, 22:23 UTCJun 21, 05:36 UTC7h 13m

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 N210UA page for operator, model, and routing details .

Mode-S A1BB45 frequently asked

What is Mode-S code A1BB45?
A1BB45 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N210UA.
Where is Mode-S A1BB45 registered?
Mode-S code A1BB45 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 A1BB45 broadcasting right now?
No active broadcast right now. Last signal was 19h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1BB45, octal 50335505, decimal 10,599,237.
What flights does A1BB45 operate?
Mode-S A1BB45 has broadcast 20 distinct callsigns, including UAL384, UAL1806, UAL1805, UAL383, UAL1736.