Apparatus

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sensors Mode-S transponder

A49441

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N39418 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A49441
Octal
51112101
Decimal
10,785,857
Country
US
Tail
N39418
Type
B739
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
481
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A49441.

Country allocation

The ICAO 24-bit address A49441 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
UAL279 United Airlines 8 2026-05-08
UAL1875 - 6 2026-07-17
UAL1364 - 6 2026-06-29
UAL561 United Airlines 5 2026-04-24
UAL2158 - 5 2026-07-04
UAL210 - 5 2026-06-29
UAL658 United Airlines 4 2026-05-23
UAL403 United Airlines 4 2026-05-02
UAL2608 - 4 2026-07-10
UAL2443 - 4 2026-06-20
UAL2370 - 4 2026-07-09
UAL2291 - 4 2026-06-24
UAL1733 - 4 2026-06-20
UAL1672 United Airlines 4 2026-07-18
UAL1647 - 4 2026-06-30
UAL1576 - 4 2026-06-27
UAL2737 United Airlines 3 2026-05-30
UAL2678 United Airlines 3 2026-06-15
UAL2659 United Airlines 3 2026-05-13
UAL2180 United Airlines 3 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1010 OMA → SFO Jul 26, 20:45 UTCJul 26, 22:15 UTC1h 30m
2026-07-26 UAL1010 OMA → SFO Jul 26, 16:00 UTCJul 26, 19:05 UTC3h 5m
2026-07-26 UAL1188 RDM → DEN Jul 26, 12:35 UTCJul 26, 14:15 UTC1h 40m
2026-07-26 UAL1188 RDM → DEN Jul 26, 12:31 UTCJul 26, 14:27 UTC1h 56m
2026-07-26 UAL1588 EWR → SAV Jul 26, 02:45 UTCJul 26, 04:45 UTC2h 0m
2026-07-25 UAL728 AUS → EWR Jul 25, 22:45 UTCJul 26, 00:40 UTC1h 55m
2026-07-25 UAL728 AUS → EWR Jul 25, 22:43 UTCJul 26, 00:39 UTC1h 56m
2026-07-25 UAL1382 PHX → EWR Jul 25, 18:30 UTCJul 25, 19:20 UTC50m
2026-07-25 UAL1355 IAD → EWR Jul 25, 16:15 UTCJul 25, 17:00 UTC45m
2026-07-25 UAL1355 IAD → EWR Jul 25, 16:11 UTCJul 25, 16:58 UTC47m
2026-07-25 UAL2420 RSW → IAH Jul 25, 11:35 UTCJul 25, 13:50 UTC2h 15m
2026-07-25 UAL2420 RSW → IAH Jul 25, 11:41 UTCJul 25, 13:33 UTC1h 52m
2026-07-25 UAL2042 ORD → BDL Jul 25, 00:10 UTCJul 25, 02:20 UTC2h 10m
2026-07-25 UAL2042 ORD → BDL Jul 25, 00:20 UTCJul 25, 02:15 UTC1h 55m
2026-07-24 UAL2057 IAH → BZN Jul 24, 16:10 UTCJul 24, 17:20 UTC1h 10m
2026-07-24 UAL2244 EWR → MCO Jul 24, 13:20 UTCJul 24, 14:35 UTC1h 15m
2026-07-24 UAL2244 EWR → MCO Jul 24, 13:21 UTCJul 24, 14:35 UTC1h 14m
2026-07-24 UAL1373 ORD → DCA Jul 24, 00:05 UTCJul 24, 02:30 UTC2h 25m
2026-07-23 UAL1373 ORD → DCA Jul 23, 19:35 UTCJul 23, 21:50 UTC2h 15m
2026-07-23 UAL2225 ALB → ORD Jul 23, 14:20 UTCJul 23, 17:30 UTC3h 10m
2026-07-23 UAL2483 ORD → PDX Jul 23, 10:10 UTCJul 23, 11:25 UTC1h 15m
2026-07-22 UAL2827 ORD → TYS Jul 22, 23:35 UTCJul 23, 00:35 UTC1h 0m
2026-07-22 UAL2179 LGA → ORD Jul 22, 19:15 UTCJul 22, 21:20 UTC2h 5m
2026-07-22 UAL1850 IAH → SFO Jul 22, 16:05 UTCJul 22, 17:50 UTC1h 45m
2026-07-22 UAL1850 IAH → SFO Jul 22, 16:06 UTCJul 22, 17:51 UTC1h 45m
2026-07-22 UAL567 BOS → ORD Jul 22, 13:00 UTCJul 22, 13:50 UTC50m
2026-07-22 UAL567 BOS → ORD Jul 22, 12:52 UTCJul 22, 13:38 UTC46m
2026-07-21 UAL1732 PHL → IAH Jul 21, 17:50 UTCJul 21, 20:05 UTC2h 15m
2026-07-21 UAL1076 - Jul 21, 13:00 UTCJul 21, 15:00 UTC2h 0m
2026-07-21 UAL2486 SAN → ORD Jul 21, 00:00 UTCJul 21, 03:40 UTC3h 40m
2026-07-20 UAL2683 ORD → SAN Jul 20, 18:45 UTCJul 20, 22:25 UTC3h 40m
2026-07-20 UAL1252 EWR → MIA Jul 20, 15:05 UTCJul 20, 16:35 UTC1h 30m
2026-07-20 UAL1689 - Jul 20, 11:50 UTCJul 20, 13:10 UTC1h 20m
2026-07-20 UAL1411 SFO → EWR Jul 20, 00:40 UTCJul 20, 02:40 UTC2h 0m
2026-07-19 UAL1436 BOS → ORD Jul 19, 17:45 UTCJul 19, 23:00 UTC5h 15m
2026-07-19 UAL1464 EWR → FLL Jul 19, 13:40 UTCJul 19, 15:30 UTC1h 50m
2026-07-19 UAL395K DEN → SLC Jul 19, 02:55 UTCJul 19, 04:45 UTC1h 50m
2026-07-19 UAL395K DEN → SLC Jul 19, 02:59 UTCJul 19, 04:45 UTC1h 46m
2026-07-18 UAL624 - Jul 18, 23:35 UTCJul 19, 01:00 UTC1h 25m
2026-07-18 UAL455 ORD → MSN Jul 18, 18:40 UTCJul 18, 21:35 UTC2h 55m
2026-07-18 UAL1334 YYZ → ORD Jul 18, 15:20 UTCJul 18, 16:40 UTC1h 20m
2026-07-18 UAL2247 SFO → IAD Jul 18, 12:40 UTCJul 18, 13:45 UTC1h 5m
2026-07-18 UAL1672 DEN → SFO Jul 18, 02:29 UTCJul 18, 05:40 UTC3h 11m
2026-07-17 UAL1875 - Jul 17, 22:15 UTCJul 18, 01:20 UTC3h 5m
2026-07-17 UAL1401 DFW → ORD Jul 17, 17:09 UTCJul 17, 19:09 UTC2h 0m
2026-07-17 UAL1401 DFW → ORD Jul 17, 17:15 UTCJul 17, 18:54 UTC1h 39m
2026-07-17 UAL2471 IAD → DFW Jul 17, 12:35 UTCJul 17, 15:05 UTC2h 30m
2026-07-17 UAL237T ORD → PHL Jul 17, 05:58 UTCJul 17, 10:49 UTC4h 51m
2026-07-17 UAL237T ORD → PHL Jul 17, 06:05 UTCJul 17, 10:50 UTC4h 45m
2026-07-17 UAL2241 - Jul 17, 02:30 UTCJul 17, 04:25 UTC1h 55m

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 N39418 page for operator, model, and routing details .

Mode-S A49441 frequently asked

What is Mode-S code A49441?
A49441 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N39418.
Where is Mode-S A49441 registered?
Mode-S code A49441 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 A49441 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 A49441, octal 51112101, decimal 10,785,857.
What flights does A49441 operate?
Mode-S A49441 has broadcast 20 distinct callsigns, including UAL279, UAL1875, UAL1364, UAL561, UAL2158.