Apparatus

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sensors Mode-S transponder

A05A03

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N12116 · BOEING 757-200 · operated by UNITED AIRLINES INC

Hex
A05A03
Octal
50055003
Decimal
10,508,803
Country
US
Tail
N12116
Type
B752
Broadcasting now · callsign UAL229 · 38,000 ft
Flights observed
285
Distinct callsigns
20
Country
US
Last broadcast
38m ago

Current position

A05A03 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A05A03 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
UAL648 - 12 2026-06-30
UAL316 - 9 2026-07-03
UAL2434 - 9 2026-07-06
UAL332 United Airlines 8 2026-05-07
UAL351 - 6 2026-07-09
UAL317 - 6 2026-07-12
UAL2248 - 6 2026-06-30
UAL978 - 5 2026-07-13
UAL419 United Airlines 5 2026-06-07
UAL350 - 5 2026-07-08
UAL289 - 5 2026-07-08
UAL288 - 5 2026-07-07
UAL2743 United Airlines 5 2026-05-27
UAL2626 - 5 2026-07-05
UAL2416 United Airlines 5 2026-05-11
UAL228 - 5 2026-07-14
UAL2191 - 5 2026-06-24
UAL1149 United Airlines 5 2026-07-04
UAL912 United Airlines 4 2026-05-28
UAL560 United Airlines 4 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL229 - Jul 14, 11:45 UTCJul 14, 16:45 UTC5h 0m
2026-07-14 UAL228 IAD → DUB Jul 14, 02:45 UTCJul 14, 10:05 UTC7h 20m
2026-07-13 UAL979 - Jul 13, 11:35 UTCJul 13, 19:05 UTC7h 30m
2026-07-13 UAL978 IAD → EDI Jul 13, 03:10 UTCJul 13, 10:00 UTC6h 50m
2026-07-12 UAL229 DUB → IAD Jul 12, 11:50 UTCJul 12, 18:55 UTC7h 5m
2026-07-12 UAL317 - Jul 12, 03:45 UTCJul 12, 05:20 UTC1h 35m
2026-07-12 UAL317 EWR → DUB Jul 12, 03:42 UTCJul 12, 09:47 UTC6h 5m
2026-07-11 UAL1597 SFO → EWR Jul 11, 20:35 UTCJul 12, 01:35 UTC5h 0m
2026-07-11 UAL1597 SFO → EWR Jul 11, 19:57 UTCJul 12, 01:35 UTC5h 38m
2026-07-11 UAL1777 EWR → SFO Jul 11, 12:39 UTCJul 11, 17:58 UTC5h 19m
2026-07-11 UAL1777 EWR → SFO Jul 11, 12:30 UTCJul 11, 18:00 UTC5h 30m
2026-07-10 UAL1283 DEN → EWR Jul 10, 21:35 UTCJul 11, 00:35 UTC3h 0m
2026-07-09 UAL663C - Jul 9, 22:50 UTCJul 10, 03:05 UTC4h 15m
2026-07-09 UAL663C EWR → DEN Jul 9, 20:46 UTCJul 10, 02:53 UTC6h 7m
2026-07-09 UAL351 - Jul 9, 07:45 UTCJul 9, 09:05 UTC1h 20m
2026-07-09 UAL351 AGP → EWR Jul 9, 07:52 UTCJul 9, 15:46 UTC7h 54m
2026-07-08 UAL350 - Jul 8, 22:30 UTCJul 9, 05:35 UTC7h 5m
2026-07-08 UAL2759 ORD → EWR Jul 8, 18:45 UTCJul 8, 20:25 UTC1h 40m
2026-07-08 UAL289 - Jul 8, 08:35 UTCJul 8, 16:00 UTC7h 25m
2026-07-07 UAL288 - Jul 7, 23:35 UTCJul 8, 06:20 UTC6h 45m
2026-07-07 UAL288 ORD → SNN Jul 7, 23:47 UTCJul 8, 06:09 UTC6h 22m
2026-07-07 UAL119 - Jul 7, 18:30 UTCJul 7, 19:00 UTC30m
2026-07-07 UAL119 - Jul 7, 10:35 UTCJul 7, 11:40 UTC1h 5m
2026-07-07 UAL119 EDI → ORD Jul 7, 10:43 UTCJul 7, 18:14 UTC7h 31m
2026-07-07 UAL36 - Jul 7, 02:35 UTCJul 7, 04:15 UTC1h 40m
2026-07-07 UAL36 EWR → EDI Jul 7, 02:18 UTCJul 7, 08:25 UTC6h 7m
2026-07-06 UAL2127 - Jul 6, 18:15 UTCJul 6, 23:05 UTC4h 50m
2026-07-06 UAL2434 - Jul 6, 09:55 UTCJul 6, 15:15 UTC5h 20m
2026-07-05 UAL2626 SFO → EWR Jul 5, 23:40 UTCJul 6, 05:00 UTC5h 20m
2026-07-05 UAL1343 - Jul 5, 16:10 UTCJul 5, 21:40 UTC5h 30m
2026-07-04 UAL1149 EWR → SRQ Jul 4, 14:18 UTCJul 4, 19:24 UTC5h 6m
2026-07-04 UAL1149 EWR → SRQ Jul 4, 14:20 UTCJul 4, 19:25 UTC5h 5m
2026-07-03 UAL1558 - Jul 3, 23:50 UTCJul 4, 07:15 UTC7h 25m
2026-07-03 UAL316 DUB → EWR Jul 3, 13:02 UTCJul 3, 20:11 UTC7h 9m
2026-07-03 UAL316 DUB → EWR Jul 3, 12:45 UTCJul 3, 20:15 UTC7h 30m
2026-07-03 UAL228 IAD → DUB Jul 3, 05:00 UTCJul 3, 11:20 UTC6h 20m
2026-07-03 UAL228 IAD → DUB Jul 3, 04:50 UTCJul 3, 11:11 UTC6h 21m
2026-07-02 UAL979 EDI → IAD Jul 2, 11:50 UTCJul 2, 19:35 UTC7h 45m
2026-07-02 UAL978 IAD → EDI Jul 2, 02:25 UTCJul 2, 09:15 UTC6h 50m
2026-07-02 UAL978 IAD → EDI Jul 2, 02:30 UTCJul 2, 08:58 UTC6h 28m
2026-07-01 UAL336 - Jul 1, 18:40 UTCJul 1, 23:15 UTC4h 35m
2026-07-01 UAL2115 - Jul 1, 09:55 UTCJul 1, 15:50 UTC5h 55m
2026-06-30 UAL2248 SFO → EWR Jun 30, 22:10 UTCJul 1, 03:50 UTC5h 40m
2026-06-30 UAL648 - Jun 30, 14:55 UTCJun 30, 20:20 UTC5h 25m
2026-06-30 UAL698 SFO → EWR Jun 30, 05:35 UTCJun 30, 10:30 UTC4h 55m
2026-06-29 UAL1340 - Jun 29, 22:10 UTCJun 30, 03:50 UTC5h 41m
2026-06-29 UAL145 EWR → EWR Jun 29, 19:24 UTCJun 29, 19:39 UTC15m
2026-06-29 UAL145 OPO → EWR Jun 29, 12:10 UTCJun 29, 19:06 UTC6h 56m
2026-06-29 UAL145 - Jun 29, 11:50 UTCJun 29, 18:44 UTC6h 55m
2026-06-29 UAL144 EWR → OPO Jun 29, 01:34 UTCJun 29, 07:59 UTC6h 25m

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 N12116 page for operator, model, and routing details .

Mode-S A05A03 frequently asked

What is Mode-S code A05A03?
A05A03 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N12116.
Where is Mode-S A05A03 registered?
Mode-S code A05A03 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 A05A03 broadcasting right now?
Yes. Mode-S A05A03 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A05A03, octal 50055003, decimal 10,508,803.
What flights does A05A03 operate?
Mode-S A05A03 has broadcast 20 distinct callsigns, including UAL648, UAL316, UAL2434, UAL332, UAL351.