Apparatus

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sensors Mode-S transponder

A81005

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N61886 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A81005
Octal
52010005
Decimal
11,014,149
Country
US
Tail
N61886
Type
B739
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
368
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A81005.

Country allocation

The ICAO 24-bit address A81005 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
UAL2690 United Airlines 4 2026-05-08
UAL2486 - 4 2026-06-18
UAL1859 - 4 2026-07-12
UAL1743 - 4 2026-07-12
UAL1717 United Airlines 4 2026-04-18
UAL1335 United Airlines 4 2026-06-25
UAL1075 - 4 2026-07-17
UAL1059 United Airlines 4 2026-07-17
UAL662 - 3 2026-07-15
UAL334 - 3 2026-07-12
UAL2737 - 3 2026-06-21
UAL2327 United Airlines 3 2026-05-15
UAL1961 - 3 2026-06-28
UAL1929 United Airlines 3 2026-05-13
UAL1843 United Airlines 3 2026-07-21
UAL1800 United Airlines 3 2026-04-17
UAL1789 United Airlines 3 2026-05-05
UAL1745 United Airlines 3 2026-07-25
UAL1224 United Airlines 3 2026-04-17
UAL1093 United Airlines 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL302 DFW → EWR Jul 26, 19:45 UTCJul 26, 21:15 UTC1h 30m
2026-07-26 UAL1915 SAN → SFO Jul 26, 16:14 UTCJul 26, 18:25 UTC2h 11m
2026-07-26 UAL1915 SAN → SFO Jul 26, 16:10 UTCJul 26, 17:15 UTC1h 5m
2026-07-26 UAL1362 DEN → BWI Jul 26, 13:15 UTCJul 26, 13:55 UTC40m
2026-07-26 UAL1347 SAT → IAD Jul 26, 01:55 UTCJul 26, 02:30 UTC35m
2026-07-26 UAL1347 SAT → IAD Jul 26, 01:56 UTCJul 26, 03:07 UTC1h 11m
2026-07-25 UAL2288 IAH → LAS Jul 25, 20:35 UTCJul 26, 00:00 UTC3h 25m
2026-07-25 UAL2269 DEN → RDU Jul 25, 16:10 UTCJul 25, 19:05 UTC2h 55m
2026-07-25 UAL621 JAX → EWR Jul 25, 13:15 UTCJul 25, 14:10 UTC55m
2026-07-25 UAL484 DEN → LAS Jul 25, 05:25 UTCJul 25, 06:15 UTC50m
2026-07-25 UAL1745 SFO → IAH Jul 25, 02:35 UTCJul 25, 04:05 UTC1h 30m
2026-07-25 UAL1745 SFO → IAH Jul 25, 02:35 UTCJul 25, 04:00 UTC1h 25m
2026-07-24 UAL8133 SFO → DEN Jul 24, 22:20 UTCJul 25, 01:15 UTC2h 55m
2026-07-24 UAL1616 BNA → ORD Jul 24, 18:05 UTCJul 24, 19:10 UTC1h 5m
2026-07-24 UAL605 SFO → PDX Jul 24, 14:10 UTCJul 24, 16:25 UTC2h 15m
2026-07-24 UAL605 SFO → PDX Jul 24, 14:18 UTCJul 24, 16:22 UTC2h 4m
2026-07-24 UAL377 DEN → ORD Jul 24, 03:35 UTCJul 24, 05:35 UTC2h 0m
2026-07-23 UAL2336 EWR → SAT Jul 23, 21:45 UTCJul 24, 01:30 UTC3h 45m
2026-07-23 UAL644 LAX → EWR Jul 23, 17:45 UTCJul 23, 20:00 UTC2h 15m
2026-07-23 UAL1029 LAX → DEN Jul 23, 14:55 UTCJul 23, 16:15 UTC1h 20m
2026-07-23 UAL1937 LAX → IAD Jul 23, 05:19 UTCJul 23, 06:30 UTC1h 11m
2026-07-23 UAL1937 LAX → IAD Jul 23, 05:15 UTCJul 23, 06:30 UTC1h 15m
2026-07-23 UAL1745 SFO → IAH Jul 23, 02:25 UTCJul 23, 03:55 UTC1h 30m
2026-07-22 UAL8210 ORD → PHX Jul 22, 21:35 UTCJul 23, 00:55 UTC3h 20m
2026-07-22 UAL8210 ORD → PHX Jul 22, 21:35 UTCJul 23, 00:48 UTC3h 13m
2026-07-22 UAL745 FLL → DEN Jul 22, 17:45 UTCJul 22, 19:30 UTC1h 45m
2026-07-22 UAL530 ORD → ATL Jul 22, 14:25 UTCJul 22, 15:50 UTC1h 25m
2026-07-22 UAL709 EWR → FLL Jul 22, 11:10 UTCJul 22, 12:40 UTC1h 30m
2026-07-22 UAL440 - Jul 22, 03:00 UTCJul 22, 04:25 UTC1h 25m
2026-07-21 UAL1623 EWR → AUS Jul 21, 19:55 UTCJul 21, 21:30 UTC1h 35m
2026-07-21 UAL1623 EWR → AUS Jul 21, 17:25 UTCJul 21, 17:50 UTC25m
2026-07-21 UAL728 - Jul 21, 13:10 UTCJul 21, 15:55 UTC2h 45m
2026-07-21 UAL1843 SFO → ORD Jul 21, 00:00 UTCJul 21, 02:25 UTC2h 25m
2026-07-20 UAL2258 DEN → DEN Jul 20, 18:00 UTCJul 20, 22:30 UTC4h 30m
2026-07-20 UAL703 - Jul 20, 14:15 UTCJul 20, 16:10 UTC1h 55m
2026-07-19 UAL1349 - Jul 19, 22:20 UTCJul 20, 02:35 UTC4h 15m
2026-07-19 UAL2039 - Jul 19, 16:15 UTCJul 19, 20:45 UTC4h 30m
2026-07-19 UAL2127 - Jul 19, 13:15 UTCJul 19, 14:15 UTC1h 0m
2026-07-19 UAL367 DEN → BOI Jul 19, 04:50 UTCJul 19, 09:45 UTC4h 55m
2026-07-19 UAL367 DEN → BOI Jul 19, 04:45 UTCJul 19, 09:43 UTC4h 58m
2026-07-18 UAL1635 LAX → IAD Jul 18, 20:25 UTCJul 19, 01:10 UTC4h 45m
2026-07-18 UAL2367 PIT → SFO Jul 18, 17:45 UTCJul 18, 18:45 UTC1h 0m
2026-07-18 UAL2153 - Jul 18, 11:15 UTCJul 18, 16:05 UTC4h 50m
2026-07-17 UAL2725 - Jul 17, 22:25 UTCJul 18, 00:50 UTC2h 25m
2026-07-17 UAL1706 - Jul 17, 18:05 UTCJul 17, 20:40 UTC2h 35m
2026-07-17 UAL1706 IAH → FLL Jul 17, 18:04 UTCJul 17, 20:39 UTC2h 35m
2026-07-17 UAL1059 CUN → IAH Jul 17, 13:15 UTCJul 17, 15:00 UTC1h 45m
2026-07-17 UAL1075 - Jul 17, 07:20 UTCJul 17, 11:15 UTC3h 55m
2026-07-17 UAL1075 LAX → CUN Jul 17, 07:14 UTCJul 17, 11:39 UTC4h 25m
2026-07-17 UAL8209 SFO → PDX Jul 17, 04:25 UTCJul 17, 05:20 UTC55m

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 N61886 page for operator, model, and routing details .

Mode-S A81005 frequently asked

What is Mode-S code A81005?
A81005 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N61886.
Where is Mode-S A81005 registered?
Mode-S code A81005 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 A81005 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A81005, octal 52010005, decimal 11,014,149.
What flights does A81005 operate?
Mode-S A81005 has broadcast 20 distinct callsigns, including UAL2690, UAL2486, UAL1859, UAL1743, UAL1717.