Apparatus

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sensors Mode-S transponder

A46D29

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N38446 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A46D29
Octal
51066451
Decimal
10,775,849
Country
US
Tail
N38446
Type
B739
No current signal · last broadcast Jul 23, 19:05 UTC
Flights observed
438
Distinct callsigns
20
Country
US
Last broadcast
Jul 23, 19:05 UTC

Last known position

Most recent position reported by Mode-S A46D29.

Country allocation

The ICAO 24-bit address A46D29 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
UAL2370 - 5 2026-07-17
UAL1916 - 5 2026-06-28
UAL1695 United Airlines 5 2026-06-11
UAL1689 - 5 2026-07-12
UAL721 United Airlines 4 2026-06-11
UAL334 - 4 2026-07-07
UAL2690 - 4 2026-06-16
UAL2640 United Airlines 4 2026-07-22
UAL1859 - 4 2026-07-07
UAL1421 - 4 2026-07-23
UAL1335 United Airlines 4 2026-05-22
UAL1075 - 4 2026-06-27
UAL1033 - 4 2026-06-28
UAL759 - 3 2026-07-11
UAL728 - 3 2026-07-20
UAL592 United Airlines 3 2026-04-15
UAL587 United Airlines 3 2026-04-23
UAL2110 - 3 2026-07-02
UAL2050 - 3 2026-06-27
UAL1999 United Airlines 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 UAL1421 - Jul 23, 16:30 UTCJul 23, 19:00 UTC2h 30m
2026-07-23 UAL1897 LAX → ORD Jul 23, 03:15 UTCJul 23, 05:35 UTC2h 20m
2026-07-22 UAL286 CLE → DEN Jul 22, 22:20 UTCJul 23, 01:30 UTC3h 10m
2026-07-22 UAL1155 DEN → IND Jul 22, 17:35 UTCJul 22, 20:50 UTC3h 15m
2026-07-22 UAL2640 FLL → EWR Jul 22, 15:15 UTCJul 22, 16:20 UTC1h 5m
2026-07-21 UAL2640 FLL → EWR Jul 21, 15:50 UTCJul 21, 20:10 UTC4h 20m
2026-07-21 UAL2640 FLL → EWR Jul 21, 15:33 UTCJul 21, 20:03 UTC4h 30m
2026-07-21 UAL377 DEN → ORD Jul 21, 03:20 UTCJul 21, 05:25 UTC2h 5m
2026-07-20 UAL2336 PDX → ORD Jul 20, 21:40 UTCJul 21, 01:05 UTC3h 24m
2026-07-20 UAL644 LAX → EWR Jul 20, 17:49 UTCJul 20, 19:50 UTC2h 1m
2026-07-20 UAL644 LAX → EWR Jul 20, 17:45 UTCJul 20, 19:55 UTC2h 10m
2026-07-20 UAL728 - Jul 20, 13:15 UTCJul 20, 15:40 UTC2h 25m
2026-07-20 UAL728 CMH → DEN Jul 20, 13:13 UTCJul 20, 15:47 UTC2h 34m
2026-07-20 UAL8143 ORD → SAT Jul 20, 00:00 UTCJul 20, 02:15 UTC2h 15m
2026-07-20 UAL8143 ORD → SAT Jul 20, 00:03 UTCJul 20, 02:18 UTC2h 15m
2026-07-19 UAL1126 IAD → DEN Jul 19, 18:50 UTCJul 19, 21:55 UTC3h 5m
2026-07-19 UAL1101 DEN → IAD Jul 19, 14:20 UTCJul 19, 17:10 UTC2h 50m
2026-07-19 UAL2666 ORD → DEN Jul 19, 10:20 UTCJul 19, 12:15 UTC1h 55m
2026-07-19 UAL2487 RSW → EWR Jul 19, 01:05 UTCJul 19, 04:40 UTC3h 35m
2026-07-18 UAL1044 EWR → DEN Jul 18, 16:35 UTCJul 18, 20:00 UTC3h 25m
2026-07-18 UAL656 CID → ORD Jul 18, 14:09 UTCJul 18, 14:48 UTC39m
2026-07-18 UAL1923 - Jul 18, 03:50 UTCJul 18, 04:20 UTC30m
2026-07-18 UAL1494 - Jul 18, 00:29 UTCJul 18, 01:54 UTC1h 25m
2026-07-17 UAL1349 - Jul 17, 21:34 UTCJul 17, 22:40 UTC1h 5m
2026-07-17 UAL2370 - Jul 17, 15:00 UTCJul 17, 19:00 UTC4h 0m
2026-07-16 UAL1920 - Jul 16, 22:49 UTCJul 17, 02:25 UTC3h 35m
2026-07-16 UAL1401 - Jul 16, 19:55 UTCJul 16, 20:25 UTC30m
2026-07-16 UAL1401 - Jul 16, 18:10 UTCJul 16, 20:15 UTC2h 5m
2026-07-16 UAL1401 DFW → ORD Jul 16, 18:00 UTCJul 16, 19:36 UTC1h 36m
2026-07-16 UAL454 EWR → DFW Jul 16, 13:32 UTCJul 16, 16:21 UTC2h 49m
2026-07-16 UAL454 EWR → DFW Jul 16, 13:25 UTCJul 16, 16:19 UTC2h 55m
2026-07-16 UAL1652 - Jul 16, 06:35 UTCJul 16, 10:59 UTC4h 25m
2026-07-15 UAL1423 EWR → YVR Jul 15, 22:20 UTCJul 16, 03:45 UTC5h 25m
2026-07-15 UAL1340 - Jul 15, 16:15 UTCJul 15, 19:25 UTC3h 10m
2026-07-15 UAL2438 - Jul 15, 11:20 UTCJul 15, 14:20 UTC3h 0m
2026-07-15 UAL2438 EWR → IAH Jul 15, 11:24 UTCJul 15, 14:20 UTC2h 56m
2026-07-14 UAL733 - Jul 14, 20:05 UTCJul 15, 00:45 UTC4h 39m
2026-07-14 UAL1292 ORD → YVR Jul 14, 14:25 UTCJul 14, 18:05 UTC3h 40m
2026-07-14 UAL709 - Jul 14, 10:25 UTCJul 14, 11:50 UTC1h 25m
2026-07-13 UAL440 ORD → BWI Jul 13, 23:50 UTCJul 14, 01:15 UTC1h 25m
2026-07-13 UAL2362 ORD → ORD Jul 13, 14:10 UTCJul 13, 22:05 UTC7h 55m
2026-07-13 UAL2070 IAD → ORD Jul 13, 10:20 UTCJul 13, 11:55 UTC1h 35m
2026-07-13 UAL1573 - Jul 13, 00:05 UTCJul 13, 04:40 UTC4h 35m
2026-07-12 UAL1689 - Jul 12, 16:50 UTCJul 12, 21:20 UTC4h 30m
2026-07-12 UAL276 MCO → IAD Jul 12, 13:10 UTCJul 12, 14:50 UTC1h 40m
2026-07-11 UAL1932 EWR → MCO Jul 11, 23:26 UTCJul 12, 01:35 UTC2h 9m
2026-07-11 UAL1932 EWR → MCO Jul 11, 23:35 UTCJul 12, 01:35 UTC2h 0m
2026-07-11 UAL1152 PHX → EWR Jul 11, 16:55 UTCJul 11, 21:20 UTC4h 25m
2026-07-11 UAL2646 EWR → PHX Jul 11, 10:40 UTCJul 11, 15:15 UTC4h 35m
2026-07-11 UAL759 ORD → EWR Jul 11, 02:35 UTCJul 11, 04:05 UTC1h 30m

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 N38446 page for operator, model, and routing details .

Mode-S A46D29 frequently asked

What is Mode-S code A46D29?
A46D29 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N38446.
Where is Mode-S A46D29 registered?
Mode-S code A46D29 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 A46D29 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 19:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A46D29, octal 51066451, decimal 10,775,849.
What flights does A46D29 operate?
Mode-S A46D29 has broadcast 20 distinct callsigns, including UAL2370, UAL1916, UAL1695, UAL1689, UAL721.