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 Jul 26, 18:45 UTC
Flights observed
313
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:45 UTC

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
UAL145 United Airlines 14 2026-07-22
UAL144 United Airlines 10 2026-07-22
UAL634 United Airlines 9 2026-07-26
UAL2679 - 9 2026-07-08
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
UAL633 United Airlines 7 2026-07-26
UAL37 United Airlines 7 2026-07-20
UAL36 United Airlines 7 2026-07-20
UAL979 United Airlines 6 2026-06-03
UAL282 United Airlines 6 2026-07-18
UAL2308 - 6 2026-06-17
UAL228 United Airlines 6 2026-06-01
UAL2127 United Airlines 6 2026-07-25
UAL1827 United Airlines 6 2026-04-16
UAL281 - 5 2026-07-18
UAL2445 United Airlines 5 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL634 ORD → CMH Jul 26, 10:55 UTCJul 26, 18:40 UTC7h 45m
2026-07-26 UAL633 LGA → IAH Jul 26, 01:45 UTCJul 26, 08:30 UTC6h 45m
2026-07-26 UAL633 LGA → IAH Jul 26, 01:40 UTCJul 26, 08:15 UTC6h 36m
2026-07-25 UAL2127 LGA → ORD Jul 25, 17:35 UTCJul 25, 22:25 UTC4h 50m
2026-07-25 UAL2434 EWR → LAX Jul 25, 10:19 UTCJul 25, 15:14 UTC4h 55m
2026-07-25 UAL2434 EWR → LAX Jul 25, 10:10 UTCJul 25, 15:25 UTC5h 15m
2026-07-24 UAL2248 BOS → EWR Jul 24, 22:45 UTCJul 25, 03:25 UTC4h 40m
2026-07-24 UAL648 EWR → SFO Jul 24, 15:15 UTCJul 24, 21:00 UTC5h 45m
2026-07-24 UAL327 SJC → DEN Jul 24, 04:20 UTCJul 24, 09:10 UTC4h 50m
2026-07-24 UAL327 SJC → DEN Jul 24, 04:22 UTCJul 24, 09:04 UTC4h 42m
2026-07-23 UAL210 DEN → SFO Jul 23, 21:40 UTCJul 24, 02:50 UTC5h 10m
2026-07-23 UAL1149 EWR → SRQ Jul 23, 14:35 UTCJul 23, 19:20 UTC4h 45m
2026-07-22 UAL1558 SNA → IAH Jul 22, 23:50 UTCJul 23, 05:55 UTC6h 5m
2026-07-22 UAL145 OPO → EWR Jul 22, 14:10 UTCJul 22, 21:04 UTC6h 54m
2026-07-22 UAL145 OPO → EWR Jul 22, 14:10 UTCJul 22, 20:59 UTC6h 49m
2026-07-22 UAL145 OPO → EWR Jul 22, 14:15 UTCJul 22, 14:30 UTC15m
2026-07-22 UAL144 EWR → OPO Jul 22, 11:40 UTCJul 22, 12:20 UTC40m
2026-07-21 UAL239 ORD → BNA Jul 21, 08:45 UTCJul 21, 15:45 UTC7h 0m
2026-07-20 UAL238 CLE → ORD Jul 20, 23:50 UTCJul 21, 06:10 UTC6h 20m
2026-07-20 UAL37 EDI → EWR Jul 20, 12:05 UTCJul 20, 19:50 UTC7h 45m
2026-07-20 UAL36 EWR → EDI Jul 20, 03:05 UTCJul 20, 09:15 UTC6h 10m
2026-07-19 UAL634 - Jul 19, 21:20 UTCJul 19, 21:25 UTC5m
2026-07-19 UAL634 - Jul 19, 13:40 UTCJul 19, 14:30 UTC50m
2026-07-19 UAL634 BIO → EWR Jul 19, 13:23 UTCJul 19, 21:05 UTC7h 42m
2026-07-19 UAL634 BIO → EWR Jul 19, 13:23 UTCJul 19, 21:17 UTC7h 54m
2026-07-19 UAL633 LGA → IAH Jul 19, 04:55 UTCJul 19, 11:35 UTC6h 40m
2026-07-18 UAL282 AUS → EWR Jul 18, 11:11 UTCJul 18, 19:01 UTC7h 50m
2026-07-18 UAL282 AUS → EWR Jul 18, 10:55 UTCJul 18, 18:55 UTC8h 0m
2026-07-18 UAL281 EWR → FAO Jul 18, 02:20 UTCJul 18, 08:51 UTC6h 31m
2026-07-18 UAL281 - Jul 18, 02:25 UTCJul 18, 08:55 UTC6h 31m
2026-07-17 UAL634 - Jul 17, 11:00 UTCJul 17, 18:19 UTC7h 20m
2026-07-17 UAL633 LGA → IAH Jul 17, 02:15 UTCJul 17, 08:35 UTC6h 20m
2026-07-16 UAL2171 GRR → DEN Jul 16, 22:15 UTCJul 16, 23:59 UTC1h 45m
2026-07-16 UAL2053 - Jul 16, 18:10 UTCJul 16, 20:15 UTC2h 5m
2026-07-15 UAL634 - Jul 15, 10:50 UTCJul 15, 18:10 UTC7h 20m
2026-07-15 UAL633 EWR → BIO Jul 15, 01:40 UTCJul 15, 08:19 UTC6h 39m
2026-07-15 UAL633 - Jul 15, 01:30 UTCJul 15, 08:05 UTC6h 35m
2026-07-14 UAL145 OPO → EWR Jul 14, 12:00 UTCJul 14, 19:19 UTC7h 19m
2026-07-14 UAL145 - Jul 14, 11:50 UTCJul 14, 12:30 UTC40m
2026-07-14 UAL144 EWR → OPO Jul 14, 02:20 UTCJul 14, 08:50 UTC6h 30m
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

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 Jul 26, 18:45 UTC.
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 UAL145, UAL144, UAL634, UAL2679, UAL311.