Apparatus

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sensors Mode-S transponder

A0AD1B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14240 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A0AD1B
Octal
50126433
Decimal
10,530,075
Country
US
Tail
N14240
Type
B738
Broadcasting now · callsign UAL2102 · 37,000 ft
Flights observed
128
Distinct callsigns
20
Country
US
Last broadcast
16d ago

Current position

A0AD1B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A0AD1B 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
UAL2109 United Airlines 4 2026-07-26
UAL1542 - 4 2026-07-18
UAL539 - 3 2026-07-10
UAL469 - 3 2026-07-18
UAL1957 - 3 2026-07-16
UAL1600 - 3 2026-07-14
UAL598 - 2 2026-06-27
UAL574 - 2 2026-07-04
UAL436 - 2 2026-07-04
UAL410T - 2 2026-07-11
UAL382 - 2 2026-07-20
UAL334 - 2 2026-07-20
UAL3023 United Airlines 2 2026-07-19
UAL2757 - 2 2026-06-28
UAL264 - 2 2026-06-27
UAL251 United Airlines 2 2026-07-25
UAL2141 United Airlines 2 2026-07-26
UAL2135 - 2 2026-07-09
UAL2047 - 2 2026-07-20
UAL1903 - 2 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1570 RNO → SFO Jul 26, 17:30 UTCJul 26, 22:40 UTC5h 10m
2026-07-26 UAL2141 PHX → SFO Jul 26, 13:40 UTCJul 26, 15:00 UTC1h 20m
2026-07-26 UAL2109 PIT → DEN Jul 26, 01:25 UTCJul 26, 02:30 UTC1h 5m
2026-07-26 UAL2109 PIT → DEN Jul 26, 01:27 UTCJul 26, 03:07 UTC1h 40m
2026-07-25 UAL1867 CZM → IAH Jul 25, 20:55 UTCJul 25, 22:45 UTC1h 50m
2026-07-25 UAL1919 IAH → CZM Jul 25, 17:35 UTCJul 25, 19:25 UTC1h 50m
2026-07-25 UAL251 BWI → LAX Jul 25, 14:10 UTCJul 25, 15:55 UTC1h 45m
2026-07-25 UAL251 BWI → LAX Jul 25, 14:17 UTCJul 25, 15:49 UTC1h 32m
2026-07-24 UAL1822 SAN → ORD Jul 24, 23:10 UTCJul 25, 02:45 UTC3h 35m
2026-07-24 UAL2366 SFO → LAS Jul 24, 17:40 UTCJul 24, 20:25 UTC2h 45m
2026-07-24 UAL1524 IAH → EWR Jul 24, 13:10 UTCJul 24, 15:35 UTC2h 25m
2026-07-24 UAL3929 IAH → SFO Jul 24, 02:50 UTCJul 24, 04:40 UTC1h 50m
2026-07-22 UAL3851 FRA → SFO Jul 22, 18:25 UTCJul 22, 20:50 UTC2h 25m
2026-07-20 UAL334 - Jul 20, 21:45 UTCJul 21, 01:15 UTC3h 29m
2026-07-20 UAL382 - Jul 20, 17:25 UTCJul 20, 19:55 UTC2h 30m
2026-07-20 UAL2047 IAH → DCA Jul 20, 13:05 UTCJul 20, 15:55 UTC2h 50m
2026-07-20 UAL2379 ORF → EWR Jul 20, 07:55 UTCJul 20, 11:45 UTC3h 50m
2026-07-20 UAL2456 LAX → EWR Jul 20, 02:25 UTCJul 20, 06:15 UTC3h 50m
2026-07-19 UAL401 - Jul 19, 22:20 UTCJul 20, 00:40 UTC2h 20m
2026-07-19 UAL1737 LAX → AUS Jul 19, 17:25 UTCJul 19, 18:45 UTC1h 20m
2026-07-19 UAL1737 LAX → AUS Jul 19, 17:12 UTCJul 19, 20:21 UTC3h 9m
2026-07-19 UAL3023 ORD → SFO Jul 19, 13:17 UTCJul 19, 15:30 UTC2h 13m
2026-07-18 UAL3023 ORD → SFO Jul 18, 16:50 UTCJul 19, 15:40 UTC22h 50m
2026-07-18 UAL551 IAH → GCM Jul 18, 15:10 UTCJul 19, 14:15 UTC23h 5m
2026-07-18 UAL469 - Jul 18, 10:45 UTCJul 18, 11:25 UTC40m
2026-07-18 UAL1542 - Jul 18, 01:39 UTCJul 18, 02:14 UTC35m
2026-07-18 UAL1542 IAH → SAT Jul 18, 01:40 UTCJul 18, 02:28 UTC48m
2026-07-17 UAL2141 - Jul 17, 13:45 UTCJul 17, 15:00 UTC1h 15m
2026-07-17 UAL2109 - Jul 17, 02:30 UTCJul 17, 03:39 UTC1h 10m
2026-07-17 UAL2109 IAH → GDL Jul 17, 02:30 UTCJul 17, 04:20 UTC1h 50m
2026-07-16 UAL2026 - Jul 16, 19:14 UTCJul 16, 20:19 UTC1h 5m
2026-07-16 UAL2256 - Jul 16, 17:05 UTCJul 16, 18:10 UTC1h 5m
2026-07-16 UAL1957 - Jul 16, 11:54 UTCJul 16, 14:55 UTC3h 0m
2026-07-15 UAL334 - Jul 15, 21:30 UTCJul 16, 00:35 UTC3h 5m
2026-07-15 UAL1964 - Jul 15, 17:15 UTCJul 15, 19:40 UTC2h 25m
2026-07-15 UAL2607 - Jul 15, 13:00 UTCJul 15, 15:25 UTC2h 25m
2026-07-15 UAL469 - Jul 15, 10:55 UTCJul 15, 11:30 UTC35m
2026-07-15 UAL1542 - Jul 15, 02:00 UTCJul 15, 02:35 UTC35m
2026-07-14 UAL1601 - Jul 14, 20:40 UTCJul 14, 22:30 UTC1h 50m
2026-07-14 UAL1600 - Jul 14, 17:20 UTCJul 14, 19:20 UTC2h 0m
2026-07-14 UAL1957 LGA → IAH Jul 14, 11:45 UTCJul 14, 15:08 UTC3h 23m
2026-07-14 UAL1957 - Jul 14, 11:50 UTCJul 14, 15:10 UTC3h 20m
2026-07-14 UAL2605 ORD → LGA Jul 14, 00:05 UTCJul 14, 01:50 UTC1h 45m
2026-07-13 UAL1156 LGA → ORD Jul 13, 20:40 UTCJul 13, 22:30 UTC1h 50m
2026-07-13 UAL2267 ORD → LGA Jul 13, 17:25 UTCJul 13, 19:10 UTC1h 45m
2026-07-13 UAL1057 LGA → ORD Jul 13, 13:25 UTCJul 13, 15:25 UTC2h 0m
2026-07-13 UAL2783 - Jul 13, 00:20 UTCJul 13, 03:30 UTC3h 10m
2026-07-12 UAL1903 - Jul 12, 21:25 UTCJul 12, 22:05 UTC40m
2026-07-12 UAL1903 - Jul 12, 19:30 UTCJul 12, 19:40 UTC10m
2026-07-12 UAL1751 - Jul 12, 17:30 UTCJul 12, 17:45 UTC15m

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 N14240 page for operator, model, and routing details .

Mode-S A0AD1B frequently asked

What is Mode-S code A0AD1B?
A0AD1B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14240.
Where is Mode-S A0AD1B registered?
Mode-S code A0AD1B 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 A0AD1B broadcasting right now?
Yes. Mode-S A0AD1B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0AD1B, octal 50126433, decimal 10,530,075.
What flights does A0AD1B operate?
Mode-S A0AD1B has broadcast 20 distinct callsigns, including UAL2109, UAL1542, UAL539, UAL469, UAL1957.