Apparatus

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sensors Mode-S transponder

A39C62

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N33132 · BOEING 757-200 · operated by UNITED AIRLINES INC

Hex
A39C62
Octal
50716142
Decimal
10,722,402
Country
US
Tail
N33132
Type
B752
No current signal · last broadcast 3h ago
Flights observed
274
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A39C62.

Country allocation

The ICAO 24-bit address A39C62 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
UAL2679 - 9 2026-07-08
UAL145 - 9 2026-07-06
UAL144 - 9 2026-07-14
UAL311 United Airlines 8 2026-06-05
UAL310 United Airlines 8 2026-06-05
UAL229 United Airlines 8 2026-06-01
UAL1700 - 8 2026-07-09
UAL913 United Airlines 7 2026-06-06
UAL979 United Airlines 6 2026-06-03
UAL37 United Airlines 6 2026-06-10
UAL36 United Airlines 6 2026-06-10
UAL2308 - 6 2026-06-17
UAL228 United Airlines 6 2026-06-01
UAL1827 United Airlines 6 2026-04-16
UAL2445 United Airlines 5 2026-05-27
UAL2307 - 5 2026-06-16
UAL2127 - 5 2026-07-09
UAL1343 - 5 2026-06-11
UAL642 United Airlines 4 2026-04-30
UAL419 - 4 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL144 - Jul 14, 02:20 UTCJul 14, 03:40 UTC1h 20m
2026-07-13 UAL698 SFO → EWR Jul 13, 04:50 UTCJul 13, 09:50 UTC5h 0m
2026-07-12 UAL2080 - Jul 12, 20:40 UTCJul 13, 01:45 UTC5h 5m
2026-07-12 UAL419 SFO → EWR Jul 12, 13:29 UTCJul 12, 18:32 UTC5h 3m
2026-07-12 UAL419 SFO → EWR Jul 12, 13:30 UTCJul 12, 18:35 UTC5h 5m
2026-07-12 UAL1558 - Jul 12, 01:05 UTCJul 12, 06:15 UTC5h 10m
2026-07-11 UAL282 - Jul 11, 12:35 UTCJul 11, 13:30 UTC55m
2026-07-11 UAL282 FAO → EWR Jul 11, 12:42 UTCJul 11, 20:16 UTC7h 34m
2026-07-11 UAL281 EWR → FAO Jul 11, 04:40 UTCJul 11, 10:40 UTC6h 0m
2026-07-11 UAL281 - Jul 11, 04:25 UTCJul 11, 10:45 UTC6h 20m
2026-07-10 UAL2227 - Jul 10, 20:35 UTCJul 11, 01:25 UTC4h 50m
2026-07-10 UAL712 - Jul 10, 02:00 UTCJul 10, 07:05 UTC5h 5m
2026-07-09 UAL2127 - Jul 9, 19:25 UTCJul 10, 00:45 UTC5h 20m
2026-07-09 UAL2434 - Jul 9, 10:10 UTCJul 9, 15:20 UTC5h 10m
2026-07-09 UAL1700 - Jul 9, 01:05 UTCJul 9, 05:50 UTC4h 45m
2026-07-08 UAL2679 - Jul 8, 15:00 UTCJul 8, 20:00 UTC5h 0m
2026-07-08 UAL698 SFO → EWR Jul 8, 04:55 UTCJul 8, 09:40 UTC4h 45m
2026-07-08 UAL698 SFO → EWR Jul 8, 04:40 UTCJul 8, 09:38 UTC4h 58m
2026-07-07 UAL2080 EWR → SFO Jul 7, 20:30 UTCJul 8, 02:20 UTC5h 50m
2026-07-07 UAL419 SFO → EWR Jul 7, 13:29 UTCJul 7, 18:36 UTC5h 7m
2026-07-07 UAL419 SFO → EWR Jul 7, 13:35 UTCJul 7, 18:40 UTC5h 5m
2026-07-06 UAL2080 - Jul 6, 23:10 UTCJul 7, 04:30 UTC5h 20m
2026-07-06 UAL145 OPO → EWR Jul 6, 12:10 UTCJul 6, 19:37 UTC7h 27m
2026-07-06 UAL145 OPO → EWR Jul 6, 12:05 UTCJul 6, 19:35 UTC7h 30m
2026-07-06 UAL144 EWR → OPO Jul 6, 03:15 UTCJul 6, 09:25 UTC6h 10m
2026-07-06 UAL144 EWR → OPO Jul 6, 03:05 UTCJul 6, 09:24 UTC6h 19m
2026-07-05 UAL634 - Jul 5, 10:55 UTCJul 5, 11:45 UTC50m
2026-07-05 UAL634 BIO → EWR Jul 5, 10:53 UTCJul 5, 18:35 UTC7h 42m
2026-07-05 UAL633 - Jul 5, 01:45 UTCJul 5, 08:25 UTC6h 40m
2026-07-04 UAL282 FAO → EWR Jul 4, 13:36 UTCJul 4, 20:35 UTC6h 59m
2026-07-04 UAL282 FAO → EWR Jul 4, 13:30 UTCJul 4, 20:40 UTC7h 10m
2026-07-04 UAL281 - Jul 4, 05:00 UTCJul 4, 11:40 UTC6h 40m
2026-07-01 UAL316 - Jul 1, 12:55 UTCJul 1, 20:00 UTC7h 5m
2026-07-01 UAL316 DUB → EWR Jul 1, 12:46 UTCJul 1, 19:58 UTC7h 12m
2026-07-01 UAL317 EWR → DUB Jul 1, 03:30 UTCJul 1, 09:30 UTC6h 0m
2026-06-30 UAL1597 SFO → EWR Jun 30, 20:20 UTCJul 1, 01:15 UTC4h 55m
2026-06-30 UAL1777 EWR → SFO Jun 30, 12:30 UTCJun 30, 18:00 UTC5h 30m
2026-06-29 UAL1283 EWR → ATL Jun 29, 18:55 UTCJun 29, 22:05 UTC3h 10m
2026-06-29 UAL1283 EWR → ATL Jun 29, 19:03 UTCJun 29, 22:07 UTC3h 4m
2026-06-29 UAL1759 - Jun 29, 14:39 UTCJun 29, 16:35 UTC1h 55m
2026-06-29 UAL1759 - Jun 29, 10:29 UTCJun 29, 10:40 UTC10m
2026-06-29 UAL1758 - Jun 29, 09:10 UTCJun 29, 09:20 UTC10m
2026-06-29 UAL1758 - Jun 29, 02:39 UTCJun 29, 05:09 UTC2h 30m
2026-06-28 UAL663 - Jun 28, 21:20 UTCJun 29, 01:00 UTC3h 40m
2026-06-28 UAL145 OPO → EWR Jun 28, 12:10 UTCJun 28, 19:27 UTC7h 17m
2026-06-28 UAL145 - Jun 28, 11:50 UTCJun 28, 12:25 UTC35m
2026-06-28 UAL144 EWR → OPO Jun 28, 02:25 UTCJun 28, 08:14 UTC5h 50m
2026-06-28 UAL144 EWR → OPO Jun 28, 02:25 UTCJun 28, 08:07 UTC5h 42m
2026-06-27 UAL2227 - Jun 27, 19:45 UTCJun 28, 00:20 UTC4h 35m
2026-06-26 UAL2641 SFO → SAN Jun 26, 21:55 UTCJun 27, 03:15 UTC5h 20m

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 N33132 page for operator, model, and routing details .

Mode-S A39C62 frequently asked

What is Mode-S code A39C62?
A39C62 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N33132.
Where is Mode-S A39C62 registered?
Mode-S code A39C62 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 A39C62 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A39C62, octal 50716142, decimal 10,722,402.
What flights does A39C62 operate?
Mode-S A39C62 has broadcast 20 distinct callsigns, including UAL2679, UAL145, UAL144, UAL311, UAL310.