Apparatus

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sensors Mode-S transponder

A12B4C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17460 · operated by UNITED AIRLINES INC

Hex
A12B4C
Octal
50225514
Decimal
10,562,380
Country
US
Tail
N17460
No current signal · last broadcast Jul 26, 15:30 UTC
Flights observed
105
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 15:30 UTC

Last known position

Most recent position reported by Mode-S A12B4C.

Country allocation

The ICAO 24-bit address A12B4C 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
UAL410 - 4 2026-07-15
UAL2024 United Airlines 3 2026-07-25
UAL1216 - 3 2026-07-15
BOE960 - 3 2026-06-23
UAL699 - 2 2026-07-17
UAL4208 - 2 2026-06-26
UAL3759 - 2 2026-07-13
UAL2856 United Airlines 2 2026-07-22
UAL2740 - 2 2026-07-01
UAL2229 - 2 2026-07-06
UAL2117 - 2 2026-07-03
UAL1804 - 2 2026-07-16
UAL1648 - 2 2026-07-16
UAL1603 - 2 2026-07-11
UAL1477 - 2 2026-06-29
UAL1259 - 2 2026-07-03
UAL1192 United Airlines 2 2026-07-25
UAL1171 United Airlines 2 2026-07-24
UAL1168 - 2 2026-07-10
UAL1155 United Airlines 2 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1535 EWR → ORD Jul 26, 14:45 UTCJul 26, 15:30 UTC45m
2026-07-26 UAL529 IAH → EWR Jul 26, 12:40 UTCJul 26, 13:20 UTC40m
2026-07-25 UAL2024 SJU → IAD Jul 25, 23:05 UTCJul 26, 00:45 UTC1h 40m
2026-07-25 UAL2024 SJU → IAD Jul 25, 21:10 UTCJul 25, 21:20 UTC10m
2026-07-25 UAL2024 SJU → IAD Jul 25, 21:09 UTCJul 26, 00:41 UTC3h 32m
2026-07-25 UAL1192 IAH → SJU Jul 25, 19:15 UTCJul 25, 19:30 UTC15m
2026-07-25 UAL1192 IAH → SJU Jul 25, 15:25 UTCJul 25, 17:40 UTC2h 15m
2026-07-25 UAL537 IAH → YYC Jul 25, 12:10 UTCJul 25, 13:20 UTC1h 10m
2026-07-25 UAL1794 OGG → SFO Jul 25, 01:40 UTCJul 25, 02:50 UTC1h 10m
2026-07-24 UAL1171 AUA → IAH Jul 24, 20:10 UTCJul 24, 23:45 UTC3h 35m
2026-07-24 UAL1171 AUA → IAH Jul 24, 19:20 UTCJul 24, 19:35 UTC15m
2026-07-24 UAL1040 - Jul 24, 17:30 UTCJul 24, 17:45 UTC15m
2026-07-24 UAL1040 - Jul 24, 13:30 UTCJul 24, 16:55 UTC3h 25m
2026-07-24 UAL1289 EWR → ATL Jul 24, 10:15 UTCJul 24, 11:40 UTC1h 25m
2026-07-24 UAL2796 JAX → EWR Jul 24, 02:35 UTCJul 24, 04:05 UTC1h 30m
2026-07-23 UAL279 CLT → EWR Jul 23, 22:00 UTCJul 24, 00:25 UTC2h 25m
2026-07-23 UAL651 SAN → SFO Jul 23, 17:40 UTCJul 23, 20:35 UTC2h 55m
2026-07-23 UAL1219 ATL → DEN Jul 23, 12:35 UTCJul 23, 15:30 UTC2h 55m
2026-07-22 UAL2856 EWR → JAX Jul 22, 23:18 UTCJul 23, 02:20 UTC3h 2m
2026-07-22 UAL2856 EWR → JAX Jul 22, 23:10 UTCJul 23, 02:25 UTC3h 15m
2026-07-22 UAL1845 BWI → LAX Jul 22, 17:50 UTCJul 22, 21:35 UTC3h 45m
2026-07-22 UAL2630 SFO → PHL Jul 22, 11:35 UTCJul 22, 16:00 UTC4h 25m
2026-07-19 UAL404 SFO → DEN Jul 19, 23:45 UTCJul 20, 03:10 UTC3h 25m
2026-07-19 UAL1455 EWR → MIA Jul 19, 19:40 UTCJul 19, 22:10 UTC2h 30m
2026-07-19 UAL1454 IAH → NAS Jul 19, 15:15 UTCJul 19, 17:35 UTC2h 20m
2026-07-18 UAL556 - Jul 18, 21:30 UTCJul 19, 00:25 UTC2h 55m
2026-07-18 UAL570 BOS → EWR Jul 18, 12:15 UTCJul 18, 13:05 UTC50m
2026-07-18 UAL1032 SAN → EWR Jul 18, 02:35 UTCJul 18, 04:20 UTC1h 46m
2026-07-17 UAL699 - Jul 17, 22:10 UTCJul 18, 00:19 UTC2h 10m
2026-07-17 UAL699 IAH → ORD Jul 17, 21:50 UTCJul 18, 00:04 UTC2h 14m
2026-07-17 UAL2638 - Jul 17, 16:29 UTCJul 17, 18:29 UTC2h 0m
2026-07-17 UAL1738 IAD → ORD Jul 17, 02:39 UTCJul 17, 04:10 UTC1h 30m
2026-07-16 UAL1648 - Jul 16, 20:35 UTCJul 17, 00:25 UTC3h 50m
2026-07-16 UAL1648 AUA → IAD Jul 16, 20:44 UTCJul 17, 00:23 UTC3h 39m
2026-07-16 UAL1804 - Jul 16, 18:44 UTCJul 16, 19:10 UTC25m
2026-07-16 UAL1804 - Jul 16, 15:05 UTCJul 16, 17:00 UTC1h 55m
2026-07-16 UAL2358 - Jul 16, 11:15 UTCJul 16, 13:10 UTC1h 55m
2026-07-16 UAL465 - Jul 16, 01:15 UTCJul 16, 03:05 UTC1h 50m
2026-07-15 UAL1216 - Jul 15, 21:25 UTCJul 15, 23:40 UTC2h 15m
2026-07-15 UAL410 - Jul 15, 17:40 UTCJul 15, 19:40 UTC2h 0m
2026-07-15 UAL722 - Jul 15, 13:10 UTCJul 15, 15:15 UTC2h 5m
2026-07-14 UAL1379 IAD → FLL Jul 14, 22:05 UTCJul 15, 00:15 UTC2h 9m
2026-07-14 UAL1873 - Jul 14, 16:15 UTCJul 14, 20:20 UTC4h 5m
2026-07-14 UAL602 ORD → PHX Jul 14, 01:50 UTCJul 14, 04:45 UTC2h 55m
2026-07-13 UAL1650 - Jul 13, 17:50 UTCJul 13, 22:40 UTC4h 50m
2026-07-13 UAL1203 IAD → AUA Jul 13, 12:20 UTCJul 13, 16:25 UTC4h 5m
2026-07-13 UAL3759 - Jul 13, 02:25 UTCJul 13, 03:10 UTC45m
2026-07-13 UAL3759 CLE → IAD Jul 13, 02:20 UTCJul 13, 03:11 UTC51m
2026-07-12 UAL3778 - Jul 12, 23:00 UTCJul 13, 01:25 UTC2h 25m
2026-07-12 UAL3752 IAD → MIA Jul 12, 16:45 UTCJul 12, 19:01 UTC2h 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 N17460 page for operator, model, and routing details .

Mode-S A12B4C frequently asked

What is Mode-S code A12B4C?
A12B4C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17460.
Where is Mode-S A12B4C registered?
Mode-S code A12B4C 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 A12B4C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12B4C, octal 50225514, decimal 10,562,380.
What flights does A12B4C operate?
Mode-S A12B4C has broadcast 20 distinct callsigns, including UAL410, UAL2024, UAL1216, BOE960, UAL699.