Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A885F4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N64844 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A885F4
Octal
52102764
Decimal
11,044,340
Country
US
Tail
N64844
Type
B739
No current signal · last broadcast Jul 26, 12:15 UTC
Flights observed
420
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 12:15 UTC

Last known position

Most recent position reported by Mode-S A885F4.

Country allocation

The ICAO 24-bit address A885F4 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
UAL2600 United Airlines 5 2026-05-01
UAL2081 United Airlines 5 2026-07-23
UAL1916 - 5 2026-07-09
UAL644 United Airlines 4 2026-07-21
UAL602 - 4 2026-06-25
UAL2336 United Airlines 4 2026-07-22
UAL1868 United Airlines 4 2026-05-20
UAL589 United Airlines 3 2026-07-22
UAL545 United Airlines 3 2026-05-04
UAL277 United Airlines 3 2026-05-31
UAL254 United Airlines 3 2026-06-19
UAL2466 - 3 2026-06-25
UAL2347 United Airlines 3 2026-07-19
UAL2209 United Airlines 3 2026-07-19
UAL2155 - 3 2026-07-21
UAL2138 United Airlines 3 2026-05-27
UAL2136 - 3 2026-06-26
UAL2091 - 3 2026-07-06
UAL1693 - 3 2026-06-19
UAL1501 - 3 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL709 EWR → FLL Jul 26, 10:45 UTCJul 26, 12:15 UTC1h 30m
2026-07-26 UAL440 DEN → LAX Jul 26, 00:00 UTCJul 26, 01:20 UTC1h 20m
2026-07-25 UAL728 AUS → EWR Jul 25, 19:15 UTCJul 25, 20:15 UTC1h 0m
2026-07-25 UAL1843 SFO → ORD Jul 25, 00:10 UTCJul 25, 02:30 UTC2h 20m
2026-07-24 UAL1961 LAS → IAD Jul 24, 20:10 UTCJul 24, 22:10 UTC2h 0m
2026-07-24 UAL2145 MFR → SFO Jul 24, 14:45 UTCJul 24, 18:35 UTC3h 50m
2026-07-24 UAL2672 DEN → MSN Jul 24, 10:20 UTCJul 24, 11:00 UTC40m
2026-07-24 UAL2672 DEN → MSN Jul 24, 10:23 UTCJul 24, 12:20 UTC1h 57m
2026-07-24 UAL516 SFO → LAX Jul 24, 00:15 UTCJul 24, 01:55 UTC1h 40m
2026-07-23 UAL1393 EWR → ORD Jul 23, 20:05 UTCJul 23, 21:35 UTC1h 30m
2026-07-23 UAL1393 EWR → ORD Jul 23, 19:56 UTCJul 23, 21:16 UTC1h 20m
2026-07-23 UAL2081 SFO → IAH Jul 23, 13:20 UTCJul 23, 17:55 UTC4h 35m
2026-07-23 UAL298 AUS → EWR Jul 23, 03:25 UTCJul 23, 04:20 UTC55m
2026-07-22 UAL589 DEN → RIC Jul 22, 21:10 UTCJul 23, 00:30 UTC3h 20m
2026-07-22 UAL470 - Jul 22, 16:45 UTCJul 22, 18:45 UTC2h 0m
2026-07-22 UAL470 MIA → IAH Jul 22, 16:47 UTCJul 22, 18:42 UTC1h 55m
2026-07-22 UAL1966 MSY → EWR Jul 22, 12:35 UTCJul 22, 14:55 UTC2h 20m
2026-07-22 UAL1966 MSY → EWR Jul 22, 12:44 UTCJul 22, 14:55 UTC2h 11m
2026-07-22 UAL2665 - Jul 22, 03:40 UTCJul 22, 05:25 UTC1h 45m
2026-07-22 UAL2336 EWR → SAT Jul 22, 01:10 UTCJul 22, 01:30 UTC20m
2026-07-21 UAL2336 EWR → SAT Jul 21, 21:40 UTCJul 22, 01:30 UTC3h 50m
2026-07-21 UAL2336 EWR → SAT Jul 21, 21:35 UTCJul 22, 00:51 UTC3h 16m
2026-07-21 UAL644 LAX → EWR Jul 21, 17:49 UTCJul 21, 19:58 UTC2h 9m
2026-07-21 UAL644 LAX → EWR Jul 21, 17:55 UTCJul 21, 19:00 UTC1h 5m
2026-07-21 UAL1765 SFO → DFW Jul 21, 12:40 UTCJul 21, 15:50 UTC3h 10m
2026-07-21 UAL2155 - Jul 21, 00:05 UTCJul 21, 02:45 UTC2h 40m
2026-07-20 UAL1436 BOS → ORD Jul 20, 20:55 UTCJul 20, 22:30 UTC1h 35m
2026-07-20 UAL1342 RDU → EWR Jul 20, 17:37 UTCJul 20, 19:05 UTC1h 28m
2026-07-20 UAL1342 RDU → EWR Jul 20, 17:30 UTCJul 20, 18:10 UTC40m
2026-07-20 UAL1765 - Jul 20, 12:40 UTCJul 20, 15:25 UTC2h 45m
2026-07-20 UAL2155 - Jul 20, 00:40 UTCJul 20, 03:10 UTC2h 30m
2026-07-20 UAL2155 DEN → PIT Jul 20, 00:43 UTCJul 20, 03:11 UTC2h 28m
2026-07-19 UAL1412 TPA → EWR Jul 19, 20:40 UTCJul 19, 22:55 UTC2h 15m
2026-07-19 UAL8105 YYC → YYJ Jul 19, 18:05 UTCJul 19, 18:55 UTC50m
2026-07-19 UAL2209 PBI → EWR Jul 19, 14:37 UTCJul 19, 16:04 UTC1h 27m
2026-07-19 UAL2209 PBI → EWR Jul 19, 14:30 UTCJul 19, 16:15 UTC1h 45m
2026-07-19 UAL2347 SNA → ORD Jul 19, 03:30 UTCJul 19, 05:00 UTC1h 30m
2026-07-18 UAL589 DEN → RIC Jul 18, 22:55 UTCJul 19, 02:15 UTC3h 20m
2026-07-18 UAL2419 - Jul 18, 04:00 UTCJul 18, 05:55 UTC1h 55m
2026-07-17 UAL624 - Jul 17, 23:39 UTCJul 18, 01:05 UTC1h 25m
2026-07-17 UAL455 ORD → MSN Jul 17, 19:15 UTCJul 17, 22:15 UTC3h 0m
2026-07-17 UAL1334 YYZ → ORD Jul 17, 15:20 UTCJul 17, 16:44 UTC1h 25m
2026-07-17 UAL2247 SFO → IAD Jul 17, 12:45 UTCJul 17, 13:45 UTC1h 0m
2026-07-17 UAL1490 PDX → ORD Jul 17, 07:00 UTCJul 17, 10:35 UTC3h 35m
2026-07-17 UAL2738 ORD → PDX Jul 17, 01:55 UTCJul 17, 05:39 UTC3h 45m
2026-07-17 UAL2738 ORD → PDX Jul 17, 01:32 UTCJul 17, 05:35 UTC4h 3m
2026-07-16 UAL2627 - Jul 16, 21:05 UTCJul 16, 23:10 UTC2h 5m
2026-07-16 UAL2643 DEN → BDL Jul 16, 16:06 UTCJul 16, 19:06 UTC3h 0m
2026-07-16 UAL2643 - Jul 16, 15:55 UTCJul 16, 19:05 UTC3h 10m
2026-07-16 UAL1782 - Jul 16, 12:40 UTCJul 16, 14:05 UTC1h 25m

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 N64844 page for operator, model, and routing details .

Mode-S A885F4 frequently asked

What is Mode-S code A885F4?
A885F4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N64844.
Where is Mode-S A885F4 registered?
Mode-S code A885F4 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 A885F4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 12:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A885F4, octal 52102764, decimal 11,044,340.
What flights does A885F4 operate?
Mode-S A885F4 has broadcast 20 distinct callsigns, including UAL2600, UAL2081, UAL1916, UAL644, UAL602.