Apparatus

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sensors Mode-S transponder

A146F9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N18112 · BOEING 757-200 · operated by UNITED AIRLINES INC

Hex
A146F9
Octal
50243371
Decimal
10,569,465
Country
US
Tail
N18112
Type
B752
No current signal · last broadcast Jul 26, 17:35 UTC
Flights observed
263
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 17:35 UTC

Last known position

Most recent position reported by Mode-S A146F9.

Country allocation

The ICAO 24-bit address A146F9 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
UAL310 United Airlines 9 2026-07-22
UAL228 United Airlines 9 2026-07-17
UAL712 United Airlines 8 2026-05-22
UAL36 - 8 2026-07-14
UAL2191 - 8 2026-07-08
UAL119 United Airlines 8 2026-07-24
UAL37 United Airlines 7 2026-06-05
UAL311 United Airlines 7 2026-07-22
UAL289 United Airlines 6 2026-07-25
UAL239 - 6 2026-07-08
UAL238 - 6 2026-07-07
UAL2301 - 6 2026-06-20
UAL979 United Airlines 5 2026-07-20
UAL913 - 5 2026-06-17
UAL288 United Airlines 5 2026-07-25
UAL2788 United Airlines 5 2026-07-23
UAL2743 - 5 2026-07-10
UAL118 United Airlines 5 2026-07-24
UAL912 - 4 2026-06-22
UAL887 - 4 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL399 CLE → EWR Jul 26, 11:40 UTCJul 26, 17:30 UTC5h 50m
2026-07-26 UAL138 KEF → EWR Jul 26, 01:35 UTCJul 26, 06:35 UTC5h 1m
2026-07-25 UAL2759 IAD → EWR Jul 25, 19:35 UTCJul 25, 21:10 UTC1h 35m
2026-07-25 UAL2759 IAD → EWR Jul 25, 19:24 UTCJul 25, 21:07 UTC1h 43m
2026-07-25 UAL289 EWR → RDU Jul 25, 08:30 UTCJul 25, 08:55 UTC25m
2026-07-25 UAL289 EWR → RDU Jul 25, 08:43 UTCJul 25, 16:05 UTC7h 22m
2026-07-25 UAL289 EWR → RDU Jul 25, 08:43 UTCJul 25, 15:47 UTC7h 4m
2026-07-25 UAL288 DCA → ORD Jul 25, 00:00 UTCJul 25, 02:45 UTC2h 45m
2026-07-25 UAL288 DCA → ORD Jul 25, 00:07 UTCJul 25, 06:27 UTC6h 20m
2026-07-24 UAL119 ORD → EDI Jul 24, 18:50 UTCJul 24, 18:55 UTC5m
2026-07-24 UAL119 ORD → EDI Jul 24, 10:50 UTCJul 24, 18:55 UTC8h 5m
2026-07-24 UAL119 ORD → EDI Jul 24, 10:43 UTCJul 24, 18:32 UTC7h 49m
2026-07-24 UAL118 ORD → EDI Jul 24, 00:40 UTCJul 24, 07:20 UTC6h 40m
2026-07-23 UAL2788 DEN → EWR Jul 23, 19:10 UTCJul 23, 21:05 UTC1h 55m
2026-07-23 UAL2788 DEN → EWR Jul 23, 19:08 UTCJul 23, 20:43 UTC1h 35m
2026-07-23 UAL139 EWR → KEF Jul 23, 11:05 UTCJul 23, 17:05 UTC6h 0m
2026-07-23 UAL398 EWR → TPA Jul 23, 03:15 UTCJul 23, 05:15 UTC2h 0m
2026-07-23 UAL398 EWR → TPA Jul 23, 02:55 UTCJul 23, 08:31 UTC5h 36m
2026-07-22 UAL311 BOS → LAX Jul 22, 10:20 UTCJul 22, 17:25 UTC7h 5m
2026-07-22 UAL310 EWR → SFO Jul 22, 01:50 UTCJul 22, 03:45 UTC1h 55m
2026-07-21 UAL310 EWR → SFO Jul 21, 23:39 UTCJul 22, 08:15 UTC8h 36m
2026-07-21 UAL311 BOS → LAX Jul 21, 08:10 UTCJul 21, 15:40 UTC7h 30m
2026-07-21 UAL311 BOS → LAX Jul 21, 07:57 UTCJul 21, 15:41 UTC7h 44m
2026-07-20 UAL310 EWR → SFO Jul 20, 23:35 UTCJul 21, 06:05 UTC6h 30m
2026-07-20 UAL979 EDI → IAD Jul 20, 12:20 UTCJul 20, 19:40 UTC7h 20m
2026-07-20 UAL978 IAD → EDI Jul 20, 03:00 UTCJul 20, 10:00 UTC7h 0m
2026-07-18 UAL311 BOS → LAX Jul 18, 08:20 UTCJul 18, 15:35 UTC7h 15m
2026-07-17 UAL310 IAD → DUB Jul 17, 23:45 UTCJul 18, 06:25 UTC6h 41m
2026-07-17 UAL310 IAD → DUB Jul 17, 23:54 UTCJul 18, 06:24 UTC6h 30m
2026-07-17 UAL229 BZN → SFO Jul 17, 11:55 UTCJul 17, 18:55 UTC7h 0m
2026-07-17 UAL228 IAD → DUB Jul 17, 03:10 UTCJul 17, 09:30 UTC6h 20m
2026-07-17 UAL228 IAD → DUB Jul 17, 02:50 UTCJul 17, 09:21 UTC6h 31m
2026-07-16 UAL979 - Jul 16, 12:25 UTCJul 16, 19:45 UTC7h 20m
2026-07-16 UAL979 EDI → IAD Jul 16, 12:30 UTCJul 16, 19:45 UTC7h 15m
2026-07-14 UAL36 EWR → EDI Jul 14, 01:25 UTCJul 14, 07:40 UTC6h 15m
2026-07-13 UAL2127 - Jul 13, 17:35 UTCJul 13, 22:30 UTC4h 55m
2026-07-13 UAL2434 - Jul 13, 10:15 UTCJul 13, 15:05 UTC4h 50m
2026-07-13 UAL2626 SFO → EWR Jul 13, 00:05 UTCJul 13, 05:01 UTC4h 55m
2026-07-12 UAL1343 - Jul 12, 17:01 UTCJul 12, 22:10 UTC5h 10m
2026-07-12 UAL887 - Jul 12, 07:20 UTCJul 12, 14:15 UTC6h 55m
2026-07-12 UAL887 LIM → EWR Jul 12, 07:04 UTCJul 12, 14:13 UTC7h 9m
2026-07-11 UAL886 - Jul 11, 21:45 UTCJul 12, 04:45 UTC7h 0m
2026-07-11 UAL351 - Jul 11, 08:01 UTCJul 11, 09:15 UTC1h 15m
2026-07-11 UAL351 AGP → EWR Jul 11, 07:52 UTCJul 11, 15:58 UTC8h 6m
2026-07-10 UAL350 - Jul 10, 23:10 UTCJul 11, 05:50 UTC6h 40m
2026-07-10 UAL350 EWR → AGP Jul 10, 22:32 UTCJul 11, 05:49 UTC7h 17m
2026-07-10 UAL2743 - Jul 10, 14:55 UTCJul 10, 19:45 UTC4h 50m
2026-07-08 UAL2191 - Jul 8, 19:10 UTCJul 9, 00:10 UTC5h 0m
2026-07-08 UAL239 OPO → EWR Jul 8, 08:25 UTCJul 8, 15:26 UTC7h 1m
2026-07-08 UAL239 OPO → EWR Jul 8, 08:10 UTCJul 8, 15:25 UTC7h 15m

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 N18112 page for operator, model, and routing details .

Mode-S A146F9 frequently asked

What is Mode-S code A146F9?
A146F9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N18112.
Where is Mode-S A146F9 registered?
Mode-S code A146F9 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 A146F9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A146F9, octal 50243371, decimal 10,569,465.
What flights does A146F9 operate?
Mode-S A146F9 has broadcast 20 distinct callsigns, including UAL310, UAL228, UAL712, UAL36, UAL2191.