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 UAL2856 · 36,000 ft
Flights observed
321
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

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
UAL2434 United Airlines 11 2026-07-23
UAL351 - 9 2026-07-17
UAL316 - 9 2026-07-03
UAL332 United Airlines 8 2026-05-07
UAL350 - 6 2026-07-16
UAL317 - 6 2026-07-12
UAL2626 United Airlines 6 2026-07-25
UAL2248 - 6 2026-06-30
UAL2191 - 6 2026-07-17
UAL978 - 5 2026-07-13
UAL886 United Airlines 5 2026-07-24
UAL419 United Airlines 5 2026-06-07
UAL289 - 5 2026-07-08
UAL288 - 5 2026-07-07
UAL2743 United Airlines 5 2026-05-27
UAL2416 United Airlines 5 2026-05-11
UAL228 - 5 2026-07-14
UAL1343 United Airlines 5 2026-07-25
UAL1283 - 5 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL336 SFO → EWR Jul 26, 17:50 UTCJul 26, 22:45 UTC4h 55m
2026-07-26 UAL2115 MIA → EWR Jul 26, 10:20 UTCJul 26, 15:55 UTC5h 35m
2026-07-25 UAL2626 SFO → IAD Jul 25, 23:40 UTCJul 26, 04:30 UTC4h 50m
2026-07-25 UAL1343 EWR → TPA Jul 25, 16:05 UTCJul 25, 22:10 UTC6h 5m
2026-07-25 UAL887 LIM → EWR Jul 25, 05:05 UTCJul 25, 12:25 UTC7h 20m
2026-07-24 UAL886 EWR → LIM Jul 24, 19:15 UTCJul 25, 02:30 UTC7h 15m
2026-07-24 UAL886 EWR → LIM Jul 24, 19:03 UTCJul 25, 02:58 UTC7h 55m
2026-07-24 UAL37 EDI → EWR Jul 24, 09:15 UTCJul 24, 16:20 UTC7h 5m
2026-07-24 UAL36 EWR → EDI Jul 24, 01:45 UTCJul 24, 07:30 UTC5h 45m
2026-07-23 UAL1403 JAX → EWR Jul 23, 18:40 UTCJul 23, 23:30 UTC4h 50m
2026-07-23 UAL2434 EWR → LAX Jul 23, 10:05 UTCJul 23, 15:30 UTC5h 25m
2026-07-23 UAL2434 EWR → LAX Jul 23, 10:19 UTCJul 23, 15:21 UTC5h 2m
2026-07-22 UAL1700 IAH → EWR Jul 22, 23:20 UTCJul 23, 04:05 UTC4h 45m
2026-07-22 UAL2679 - Jul 22, 14:45 UTCJul 22, 20:20 UTC5h 35m
2026-07-22 UAL1283 DEN → EWR Jul 22, 02:08 UTCJul 22, 04:52 UTC2h 44m
2026-07-22 UAL1283 DEN → EWR Jul 22, 02:05 UTCJul 22, 05:00 UTC2h 55m
2026-07-21 UAL2308 IAH → SJC Jul 21, 05:50 UTCJul 21, 12:15 UTC6h 25m
2026-07-20 UAL2307 DEN → LIH Jul 20, 18:23 UTCJul 21, 01:19 UTC6h 56m
2026-07-20 UAL2307 DEN → LIH Jul 20, 18:25 UTCJul 21, 01:15 UTC6h 50m
2026-07-20 UAL2308 IAH → SJC Jul 20, 09:05 UTCJul 20, 11:45 UTC2h 40m
2026-07-19 UAL2307 DEN → LIH Jul 19, 18:30 UTCJul 20, 01:30 UTC7h 0m
2026-07-18 UAL2227 - Jul 18, 21:45 UTCJul 19, 03:10 UTC5h 25m
2026-07-18 UAL2227 LAX → DEN Jul 18, 21:43 UTCJul 19, 03:13 UTC5h 30m
2026-07-17 UAL2191 - Jul 17, 19:15 UTCJul 18, 00:10 UTC4h 55m
2026-07-17 UAL351 - Jul 17, 08:30 UTCJul 17, 09:50 UTC1h 20m
2026-07-17 UAL351 AGP → EWR Jul 17, 08:27 UTCJul 17, 16:26 UTC7h 59m
2026-07-17 UAL351 AGP → EWR Jul 17, 08:27 UTCJul 17, 16:18 UTC7h 51m
2026-07-16 UAL350 - Jul 16, 22:30 UTCJul 17, 05:20 UTC6h 50m
2026-07-16 UAL271 - Jul 16, 13:20 UTCJul 16, 19:45 UTC6h 25m
2026-07-16 UAL270 - Jul 16, 04:40 UTCJul 16, 10:59 UTC6h 20m
2026-07-16 UAL2171 ORD → EWR Jul 16, 00:10 UTCJul 16, 03:20 UTC3h 10m
2026-07-15 UAL2331 IAD → ORD Jul 15, 17:30 UTCJul 15, 18:55 UTC1h 25m
2026-07-15 UAL311 - Jul 15, 08:05 UTCJul 15, 15:35 UTC7h 30m
2026-07-14 UAL310 IAD → DUB Jul 14, 23:59 UTCJul 15, 06:17 UTC6h 18m
2026-07-14 UAL310 IAD → DUB Jul 14, 23:35 UTCJul 15, 06:20 UTC6h 45m
2026-07-14 UAL229 DUB → IAD Jul 14, 11:45 UTCJul 14, 19:00 UTC7h 15m
2026-07-14 UAL229 DUB → IAD Jul 14, 11:51 UTCJul 14, 18:50 UTC6h 59m
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

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, UAL2434, UAL351, UAL316, UAL332.