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
Broadcasting now · callsign UAL2667 · 37,000 ft
Flights observed
14
Distinct callsigns
6
Country
US
Last broadcast
1h ago

Current position

A146F9 is currently broadcasting. Map zoomed to live position.

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 6 distinct

Callsign Airline Flights Last seen
UAL712 United Airlines 5 2026-04-18
UAL2301 United Airlines 2 2026-04-16
UAL1283 United Airlines 2 2026-04-17
UAL1217 United Airlines 2 2026-04-17
UAL1206 United Airlines 2 2026-04-17
UAL2667 United Airlines 1 2026-04-18

Recent flights last 14

DateFlightRouteTakeoffLandingDuration
2026-04-18 UAL2667 ORD → PHL Apr 18, 17:55 UTCApr 18, 18:15 UTC20m
2026-04-18 UAL712 ORD → DEL Apr 18, 05:25 UTCApr 18, 06:25 UTC1h 0m
2026-04-18 UAL712 ORD → DEL Apr 18, 04:45 UTCApr 18, 06:25 UTC1h 40m
2026-04-18 UAL712 ORD → DEL Apr 18, 03:25 UTCApr 18, 05:20 UTC1h 55m
2026-04-18 UAL712 ORD → DEL Apr 18, 01:25 UTCApr 18, 03:20 UTC1h 55m
2026-04-18 UAL712 ORD → DEL Apr 18, 00:43 UTCApr 18, 06:20 UTC5h 37m
2026-04-17 UAL1283 EWR → ATL Apr 17, 21:25 UTCApr 17, 22:45 UTC1h 20m
2026-04-17 UAL1283 EWR → ATL Apr 17, 19:35 UTCApr 17, 21:20 UTC1h 45m
2026-04-17 UAL1217 IAH → BOS Apr 17, 13:20 UTCApr 17, 14:40 UTC1h 20m
2026-04-17 UAL1217 IAH → BOS Apr 17, 12:25 UTCApr 17, 13:15 UTC50m
2026-04-17 UAL1206 SFO → DFW Apr 17, 03:20 UTCApr 17, 04:20 UTC1h 0m
2026-04-17 UAL1206 SFO → DFW Apr 17, 02:30 UTCApr 17, 03:15 UTC45m
2026-04-16 UAL2301 PHL → ORD Apr 16, 15:15 UTCApr 16, 16:20 UTC1h 5m
2026-04-16 UAL2301 PHL → ORD Apr 16, 14:50 UTCApr 16, 15:10 UTC20m

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?
Yes. Mode-S A146F9 is currently airborne.
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 6 distinct callsigns, including UAL712, UAL2301, UAL1283, UAL1217, UAL1206.