Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A83781

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N62883 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A83781
Octal
52033601
Decimal
11,024,257
Country
US
Tail
N62883
Type
B739
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
412
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A83781.

Country allocation

The ICAO 24-bit address A83781 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
UAL1576 United Airlines 7 2026-07-25
UAL1392 United Airlines 6 2026-04-26
UAL2627 - 5 2026-07-13
UAL588 United Airlines 4 2026-07-22
UAL456 - 4 2026-07-03
UAL2646 United Airlines 4 2026-04-15
UAL2643 - 4 2026-07-13
UAL2629 - 4 2026-07-15
UAL2226 United Airlines 4 2026-06-05
UAL2058 - 4 2026-07-04
UAL1834 - 4 2026-07-04
UAL721 United Airlines 3 2026-05-27
UAL709 United Airlines 3 2026-04-16
UAL545 United Airlines 3 2026-04-15
UAL487 - 3 2026-07-09
UAL485 - 3 2026-07-03
UAL457 United Airlines 3 2026-06-06
UAL444 - 3 2026-06-17
UAL433 United Airlines 3 2026-04-24
UAL2769 - 3 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1206 SFO → DFW Jul 26, 20:35 UTCJul 26, 22:15 UTC1h 40m
2026-07-26 UAL2277 ORD → SAT Jul 26, 17:05 UTCJul 26, 19:00 UTC1h 55m
2026-07-26 UAL2277 ORD → SAT Jul 26, 17:05 UTCJul 26, 18:55 UTC1h 50m
2026-07-26 UAL2331 IAD → RDU Jul 26, 13:10 UTCJul 26, 15:00 UTC1h 50m
2026-07-25 UAL1140 LAX → IAD Jul 25, 22:35 UTCJul 26, 00:35 UTC2h 0m
2026-07-25 UAL1576 EWR → TPA Jul 25, 18:17 UTCJul 25, 20:00 UTC1h 43m
2026-07-25 UAL1576 EWR → TPA Jul 25, 18:15 UTCJul 25, 20:05 UTC1h 50m
2026-07-25 UAL1576 EWR → TPA Jul 25, 13:31 UTCJul 25, 15:38 UTC2h 7m
2026-07-25 UAL1576 EWR → TPA Jul 25, 13:10 UTCJul 25, 13:15 UTC5m
2026-07-25 UAL2078 BOS → ORD Jul 25, 07:05 UTCJul 25, 11:30 UTC4h 25m
2026-07-25 UAL1814 EWR → DFW Jul 25, 00:55 UTCJul 25, 05:20 UTC4h 25m
2026-07-24 UAL1051 CUN → EWR Jul 24, 18:25 UTCJul 24, 21:45 UTC3h 20m
2026-07-24 UAL1018 SJC → IAH Jul 24, 15:00 UTCJul 24, 16:50 UTC1h 50m
2026-07-23 UAL2215 FLL → EWR Jul 23, 23:20 UTCJul 24, 01:05 UTC1h 45m
2026-07-23 UAL496 EWR → SFO Jul 23, 19:45 UTCJul 23, 21:50 UTC2h 5m
2026-07-23 UAL1493 IAH → DEN Jul 23, 16:10 UTCJul 23, 18:05 UTC1h 55m
2026-07-23 UAL2245 SEA → ORD Jul 23, 12:35 UTCJul 23, 14:35 UTC2h 0m
2026-07-23 UAL2245 SEA → ORD Jul 23, 12:39 UTCJul 23, 14:29 UTC1h 50m
2026-07-22 UAL588 ATL → EWR Jul 22, 23:01 UTCJul 23, 01:17 UTC2h 16m
2026-07-22 UAL588 ATL → EWR Jul 22, 23:25 UTCJul 23, 01:15 UTC1h 50m
2026-07-22 UAL2793 IAD → EWR Jul 22, 18:35 UTCJul 22, 21:05 UTC2h 30m
2026-07-22 UAL1247 EWR → FLL Jul 22, 14:20 UTCJul 22, 16:40 UTC2h 20m
2026-07-21 UAL566 IAH → CVG Jul 21, 23:30 UTCJul 22, 02:00 UTC2h 30m
2026-07-21 UAL566 IAH → CVG Jul 21, 23:28 UTCJul 22, 01:54 UTC2h 26m
2026-07-21 UAL662T DEN → SMF Jul 21, 20:05 UTCJul 21, 22:00 UTC1h 55m
2026-07-21 UAL502 IAH → DCA Jul 21, 15:45 UTCJul 21, 18:05 UTC2h 20m
2026-07-21 UAL1815 EWR → CLT Jul 21, 07:55 UTCJul 21, 11:50 UTC3h 55m
2026-07-21 UAL1575 MSP → EWR Jul 21, 00:40 UTCJul 21, 05:50 UTC5h 10m
2026-07-21 UAL1575 MSP → EWR Jul 21, 00:39 UTCJul 21, 05:48 UTC5h 9m
2026-07-20 UAL2431 FLL → EWR Jul 20, 16:05 UTCJul 20, 21:10 UTC5h 5m
2026-07-20 UAL717 MFR → SFO Jul 20, 13:15 UTCJul 20, 14:20 UTC1h 5m
2026-07-20 UAL548 - Jul 20, 04:50 UTCJul 20, 05:45 UTC55m
2026-07-19 UAL1341 - Jul 19, 23:25 UTCJul 20, 02:55 UTC3h 30m
2026-07-19 UAL1056 - Jul 19, 19:00 UTCJul 19, 20:45 UTC1h 45m
2026-07-19 UAL1014 - Jul 19, 15:30 UTCJul 19, 17:15 UTC1h 45m
2026-07-19 UAL2773 - Jul 19, 11:15 UTCJul 19, 13:20 UTC2h 5m
2026-07-18 UAL1361 SNA → IAH Jul 18, 18:05 UTCJul 18, 20:05 UTC2h 0m
2026-07-18 UAL1318 EWR → MSY Jul 18, 14:10 UTCJul 18, 16:25 UTC2h 15m
2026-07-18 UAL2432 SFO → LAS Jul 18, 02:55 UTCJul 18, 05:05 UTC2h 10m
2026-07-17 UAL1033 - Jul 17, 15:35 UTCJul 18, 00:25 UTC8h 50m
2026-07-17 UAL2665 - Jul 17, 03:25 UTCJul 17, 05:25 UTC2h 0m
2026-07-17 UAL2665 ORD → IAH Jul 17, 03:13 UTCJul 17, 05:33 UTC2h 20m
2026-07-16 UAL1686 PHX → ORD Jul 16, 21:55 UTCJul 17, 00:55 UTC3h 0m
2026-07-16 UAL370 - Jul 16, 15:35 UTCJul 16, 19:55 UTC4h 20m
2026-07-16 UAL1864 - Jul 16, 11:30 UTCJul 16, 14:05 UTC2h 35m
2026-07-16 UAL1128 - Jul 16, 01:05 UTCJul 16, 03:35 UTC2h 30m
2026-07-15 UAL2629 MCO → EWR Jul 15, 20:30 UTCJul 15, 23:15 UTC2h 45m
2026-07-15 UAL2629 MCO → EWR Jul 15, 20:32 UTCJul 15, 23:08 UTC2h 36m
2026-07-15 UAL2206 IAD → MCO Jul 15, 16:55 UTCJul 15, 18:40 UTC1h 45m
2026-07-15 UAL2331 TPA → IAD Jul 15, 13:05 UTCJul 15, 14:55 UTC1h 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 N62883 page for operator, model, and routing details .

Mode-S A83781 frequently asked

What is Mode-S code A83781?
A83781 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N62883.
Where is Mode-S A83781 registered?
Mode-S code A83781 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 A83781 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A83781, octal 52033601, decimal 11,024,257.
What flights does A83781 operate?
Mode-S A83781 has broadcast 20 distinct callsigns, including UAL1576, UAL1392, UAL2627, UAL588, UAL456.